ASME B16.9 Butt Weld Fittings Dimensions Inspection

Port Diameter: Measure the inner and outer diameters of the main pipe and branch pipes to ensure compliance with design specifications.

Wall Thickness: Inspect pipe wall thickness using calipers or ultrasonic thickness gauges to guarantee pressure resistance meets standard requirements.

Total Fitting Length: Measure the total length of the main pipe and branch pipes to ensure proper alignment during on-site installation.

Branch Angle: Measure the connection angle between the branch pipe and main pipe (typically 45°, 90°, or custom angles) to ensure correct fluid flow direction.

ASME B16.9 Duplex Pipe Fittings Specification

UNS S32205 Pipe Fittings Chemical Composition

ASTM A815 UNS S32205 Pipe Fittings Mechanical Property

2205 Duplex Steel Pipe Fittings Dimensions

Buttweld Concentric Reducer Dimension

Buttweld Pipe Elbow Dimension

Nominal Size		Outside Diameter at Bevel	Center to End		Center to End			Center to Center		Back to Face
			90° Elbows	45° Elbows	90°  Elbows		45° Elbows	180  Returns
DN	NPS	OD	A	B	A		B	O		K
			3D	3D	LR	SR	LR	LR	SR	LR	SR
15	1/2	21.3			38		16	76		48
20	3/4	26.7	57	24	38		19	76		51
25	1	33.4	76	31	38	25	22	76	51	56	41
32	1 1/4	42.2	95	39	48	32	25	95	64	70	52
40	1 1/2	48.3	114	47	57	38	29	114	76	83	62
50	2	60.3	152	63	76	51	35	152	102	106	81
65	2 1/2	73.0	190	79	95	64	44	190	127	132	100
80	3	88.9	229	95	114	76	51	229	152	159	121
90	3 1/2	101.6	267	111	133	4、89	57	267	178	184	140
100	4	114.3	305	127	152	102	64	305	203	210	159
125	5	141.3	381	157	190	127	79	381	254	262	197
150	6	168.3	457	189	229	152	95	457	305	313	237
200	8	219.1	610	252	305	203	127	610	406	414	313
250	10	273.0	762	316	381	254	159	762	508	518	391
300	12	323.8	914	378	457	305	190	914	609	619	467
350	14	355.6	1067	441	533	356	222	1067	711	711	533
400	16	406.4	1219	505	610	406	254	1219	813	813	610
450	18	457.0	1372	568	686	457	286	1372	914	914	686
500	20	508.0	1524	632	762	508	318	1524	1016	1016	762
550	22	559.0	1676	694	838	559	343	1676	1118	1118	838
600	24	610.0	1829	757	914	610	381	1829	1219	1219	914
650	26	660.0	1981	821	991	660	406
700	28	711.0	2134	883	1067	711	438
750	30	762.0	2286	964	1143	762	470
800	32	813.0	2438	1010	1219	813	502
850	34	864.0	2591	1073	1295	864	533
900	36	914.0	2743	1135	1372	914	565
950	38	965.0	2896	1200	1448	965	600
1000	40	1016.0	3048	1264	1524	1016	632
1050	42	1067.0	3200	1326	1600	1067	660
1100	44	1118.0	3353	1389	1676	1118	695
1150	46	1168.0	3505	1453	1753	1168	727
1200	48	1219.0	3658	1516	1829	1219	759

Tolerances for Buttweld Fittings

ASME B16.9 Standard

This Standard covers overall dimensions, tolerances, ratings, testing, and markings for factory-made wrought buttwelding fittings in sizes NPS 1/2 through NPS 48 (DN 15 through DN 1200).

Standard Fittings. 

That the fitting was manufactured in conformance with this Standard, including all dimensional requirements, is certified by a prefix”WP” in the material grade designation marking.

Special Fittings.

That the fitting was manufactured in conformance with this Standard, except that dimensional requirements are as agreed between the purchaser and the manufacturer, is certified by a supple mentary suffix to the material grade designation marking as follows:

(a) “S58” of ASTM A960 applies for fittings in accordance with ASTM A234, A403, and A420.

(b) “S8” applies for fittings in accordance with ASTM A815.

(c) “SPLD” applies for fittings in accordance with ASTM B361, B363, and B366.

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In industrial piping systems for oil, gas, chemical, and power industries, butt weld pipe fittings serve as critical components for connecting pipes, altering flow direction, and changing pipe dimensions. These fittings must comply with stringent industry standards to ensure the safe, reliable, and efficient operation of the system.

ASME B16.9 is an internationally recognized standard for butt weld pipe fittings, covering requirements for dimensions, tolerances, inspection, and marking. Whether for elbows, tees, crosses, reducers, or caps, ASME B16.9 provides comprehensive specifications. During engineering projects and procurement processes, the Weight and Volume Chart serves as a critical reference tool. It not only impacts transportation and packaging but also directly influences cost calculations and pipeline system design.

Accurate knowledge of these fittings’ weights and volumes is essential for procurement, logistics, project cost estimation, and structural stress analysis.

ASME B16.9 Pipe Fitting Weight Calculation

Weight of 90° Elbow

Based on carbon steel density of 7.85 kg/dm³, the formula is:

W = 9.685 × 10⁻⁶ × R × (D² – d²)

Where: W is weight (kg), R is radius of curvature (mm), D is outer diameter (mm), d is inner diameter (mm).

Derived Rules:

45° elbow weight is calculated as half that of a 90° elbow.

180° elbow weight is calculated as double that of a 90° elbow.

Short-radius (R=1.0DN) elbows are estimated at two-thirds the weight of long-radius elbows.

Basic Steel Pipe Weight

As a reference benchmark for pipe fitting weight calculations, the formula is:

W = 0.02466 × T × (D – T)

Where: W is weight per meter (kg/m), T is wall thickness (mm), D is outer diameter (mm). Stainless steel pipes require an additional correction factor of 1.015.

Non-Standard Wall Thickness Estimation

For specifications not listed in standard tables, use the proportional estimation formula:

Q = W × t / T

Where: Q is estimated weight (kg), W is weight for known wall thickness at the same nominal diameter, t is target wall thickness (mm), and T is known wall thickness (mm).

Butt Weld Pipe Fittings Types

Elbows: Used to alter pipeline flow direction. Common types include 90° long radius (LR), 90° short radius (SR), and 45° elbows.

Long Radius (LR) Elbows: Bending radius equals 1.5 times the nominal size (NPS), offering low fluid resistance.

Short Radius (SR) Elbows: Bending radius equals the nominal size (NPS), suitable for space-constrained applications.

Tees: Used for pipe branching. Includes equal tees and reducing tees.

Reducers: Used to connect pipes of different sizes. Classified as concentric reducers and eccentric reducers.

Pipe Caps: Used to seal pipe ends.

Conclusion

The ASME B16.9 Butt-Weld Fittings Weight and Volume Tables serve as an essential tool for engineers, procurement personnel, and project managers. Whether used for transportation calculations, cost budgeting, or system safety analysis, accurate data is critical.

Want to get the complete ASME B16.9 Butt Weld Pipe Fittings Weight and Volume Tables PDF? Click the button below to download it for free:

✅ Free Download: ASME B16.9 Butt Weld Pipe Fittings Weight and Volume Table PDF

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Typically, flanged tees connect to pipelines via flange plates. This connection method uses bolts to tightly secure the flange plates together, with sealing gaskets placed between them to ensure joint integrity and effectively prevent fluid leakage. During operation, fluid enters through one port and, according to system requirements, is distributed through internal passages to the other two ports, enabling functions such as diversion, convergence, or directional change.

To learn more about customized flange, please click

Types of Flanged Tees

Equal Flanged Tees: Equal flanged tees are the most common type, featuring three ports of identical diameter. They are suitable for connecting branch pipes of the same diameter. Utilizing flange connections, they offer not only convenient installation and disassembly but also reliable sealing performance. They are widely used in pipeline systems across industries such as petroleum, chemical processing, and water treatment.

Reducing Flanged Tees: Reducing flanged tees feature one or two ports with differing diameters, commonly used for connecting or transitioning between pipes of varying sizes. They enable rational connections between main and branch lines, ensuring smooth fluid distribution within piping systems. These are frequently found in petrochemical plants and process pipelines.

Lateral Flanged Tees: Lateral Flanged tees feature branch pipes angled less than 90° (e.g., 45°, 60°) relative to the main pipe. This design reduces fluid resistance in applications requiring low flow resistance, such as pipelines transporting high-viscosity media. The angled configuration minimizes impact and vortex formation at branch points, thereby reducing energy loss. It is suitable for piping systems with specific fluid dynamics requirements, such as high flow rates or conditions necessitating reduced impact.

Material & Grades of Flanged Pipe Fittings :

Carbon Steel :
ASTM A105 / A105N,ASTM A350 LF2 / LF3, A694 F42 / 46 / 52 / 56 / 65 / 70

Alloy Steel :
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91

Stainless Steel :
ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L

Duplex & Super Duplex Steel :
ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61

Copper Alloy Steel :

 ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200

Nickel Alloy :
ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No.N10276), Alloy 20 (UNS No. N08020)

Flanged Tee Fitting Dimension

Flanged Pipe Tees Specification

Flange Types

All three ends of a flanged tee connect to piping via flanges. Common flange types, based on different design standards and application requirements, include:

Weld Neck Flange (WN)

Features a transition cone at the neck for butt welding to piping. Offers high strength and fatigue resistance, suitable for flanged tees in high-temperature, high-pressure, and critical piping systems.

Slip-On Flange (SO)

Pipes are inserted into the flange’s inner diameter for welding. Easy to install, suitable for flanged tees in medium-to-low pressure conditions.

Socket Weld Flange (SW)

Pipes are inserted into the flange’s socket for welding. Compact structure with high strength, commonly used for flanged tees in small-diameter high-pressure pipelines.

Threaded Flange (TH)

Connected via threads without welding. Suitable for flanged tees in hard-to-weld or low-pressure piping systems.

Blind Flange (BL)

Used to seal pipe ends. In certain applications, one end of a flanged tee may employ a blind flange for temporary or permanent sealing.

Lap Joint Flange (LJ)

Used with flanged pipe sections, suitable for pipelines requiring frequent disassembly or with high corrosion resistance requirements.

All Flanged Tee Advantages

1. Exceptional Sealing Performance

Thanks to meticulously designed flange connection structures and premium sealing gaskets, flanged tees maintain outstanding sealing capabilities across diverse operating conditions. Whether conveying high-pressure gases or liquids, or functioning in extreme temperatures, they effectively prevent leakage, ensuring safe and stable system operation.

2. Strong Adaptability

Flange tees offer multiple specifications and materials to suit piping systems with varying diameters, pressure ratings, and medium characteristics. Common materials include carbon steel, stainless steel, and alloy steel, each providing unique performance advantages to meet demands from general industrial applications to specialized corrosive environments.

3. Easy Installation and Maintenance

Compared to other complex pipe fittings, flanged tees feature relatively straightforward installation. Simply align them with the pipes and secure with bolts to complete the connection—no specialized skills or complex tools required. Additionally, they facilitate easy disassembly and replacement during maintenance and repairs, significantly reducing system maintenance costs and downtime.

4. Superior Mechanical Strength

Manufactured from high-strength materials, flanged tees exhibit outstanding mechanical strength and pressure resistance. They withstand both internal pipeline pressures and external environmental stresses, ensuring no deformation, rupture, or damage occurs during prolonged use. This provides a robust foundation for reliable pipeline system operation.

Stainless Steel Flanged Tee, SS 304 & 316

When selecting stainless steel flange tees, material choice is critical. 304 and 316 stainless steel have become two of the most commonly used materials in industrial applications due to their excellent corrosion resistance and mechanical strength, respectively.

304 stainless steel, valued for its favorable cost-performance ratio and broad applicability, is extensively used in food processing, chemical, and pharmaceutical industries. Conversely, 316 stainless steel excels in marine environments and medical equipment due to its superior corrosion resistance. The choice between these grades depends on the specific application scenario and requirements.

Butt weld tees involves more than simply connecting two or three pipes; it requires precise dimensional control, material compatibility, and comprehensive consideration of welding techniques. For both 304 and 316 stainless steel, temperature control during welding is critical—excessively high or low temperatures can compromise weld quality. Additionally, meticulous grinding and inspection are essential post-welding to ensure each weld point can withstand prolonged exposure to high pressure and temperature.

Carbon Steel Flanged Tee Manufacturer

ZIZI is a professional supplier of flanged tees, offering equal-diameter flanged tees, reducing flanged tees, and sloped tees in carbon steel, stainless steel, and alloy steel. Products are strictly manufactured according to international standards such as ASME, DIN, JIS, and GB, covering multiple pressure ratings and size specifications to meet application requirements in industries including petroleum, natural gas, chemical, power generation, and water treatment.

Seamless tees adhere to ASME B16.9 manufacturing standards with ASTM A234 WPB material specifications. Weld neck flanges comply with ASME B16.5 standards using ASTM A105 materials. We provide quality certification documents for flanges and tees, and apply black spray paint to finished products for rust prevention during long-distance sea transport. Products are exported in fumigation-free plywood crates.

We prioritize both product quality and precision, offering third-party inspections (including dimensional checks, material composition analysis, and pressure testing) to ensure every flange and tee meets customer specifications. Through consistent supply capabilities and rigorous quality control, we have established long-term partnerships with numerous domestic and international clients.

If you are seeking a reliable supplier of flanges and tees, please contact us. We are committed to providing high-quality products and comprehensive services.

Customized Flanges—Meeting Specialized Requirements

In many industrial sectors, standard components often fail to fully address specific needs. This is where custom flanged tees become particularly crucial. By collaborating with specialized manufacturers, tees can be tailored to actual operating conditions—customized in size, shape, or even with specialized functions.

For instance, complex chemical plants may require unique flange sealing methods or additional reinforcement measures, demanding manufacturers with extensive production expertise.

How to Select the Right Flanged Tee Manufacturer?

Determine the Operating Environment: Select appropriate materials and pressure ratings based on the fluid medium (corrosiveness, abrasiveness), temperature, and pressure within the pipeline.

Verify Dimensions: Confirm the nominal diameters of the main and branch pipes to determine whether an equal-diameter or reducer tee is required.

Follow Standards: Choose products compliant with relevant national or industry standards, such as ANSI flanged tees, according to project requirements.

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Fortunately, our factory had existing stock available. We immediately organized the production and shipping process. Despite the extremely tight deadline, we steadfastly upheld our principle of quality first. Before delivering the products that same day, we conducted rigorous inspections on every tee. The shipment was successfully dispatched that day, and the client expressed high recognition for our rapid response and high-quality inspection standards.

This order not only demonstrates our efficient delivery capabilities but also showcases our commitment to maintaining quality control even under urgent circumstances. No matter how pressing the client’s needs, we consistently ensure every product meets standards and client expectations.

We can not only produce standard tees, but also customize flanged tee. If you want to know more, please click

Butt Weld Tee Dimensions Inspection

Port Diameter: Measure the inner and outer diameters of the main pipe and branch pipes to ensure compliance with design specifications.

Wall Thickness: Inspect pipe wall thickness using calipers or ultrasonic thickness gauges to guarantee pressure resistance meets standard requirements.

Total Fitting Length: Measure the total length of the main pipe and branch pipes to ensure proper alignment during on-site installation.

Branch Angle: Measure the connection angle between the branch pipe and main pipe (typically 45°, 90°, or custom angles) to ensure correct fluid flow direction.

Specification of ASME B16.9 Tee

ASME B16.9 Specification for Butt Welded Fittings

This Standard covers overall dimensions, tolerances, ratings, testing, and markings for factory-made wrought buttwelding fittings in sizes NPS 1/2 through NPS 48 (DN 15 through DN 1200).

Codes and Regulations.

A fitting used under the jurisdiction of the ASME Boiler and Pressure Vessel Code(BPVC), the ASME Code for Pressure Piping, or a governmental regulation is subject to any limitation of that code or regulation. This includes any maximum temperature limitation or rule governing the use of a material at low temperature.

Pressure Rating Designation

Class followed by a dimensionless number is the designation for pressure-temperature ratings. Standardized designations for flanges per ASME B16.5 referenced in this Standard are Classes 150, 300, 600, 900, 1500, and 2500.

Marking

Standard Marking Each fitting shall be permanently marked to show the following:

(a) manufacturer’s name or trademark

(b) material identification, either the ASTM or ASME grade designation

(c) schedule number1 or nominal wall thickness in mm

(d) size — the nominal pipe size (NPS) identification number related to the end connections shall be used

(e) compliance—see para. 4.4 for standard and special fitting marking

A manufacturer may supplement these mandatory markings with others, including a DN size designation, but confusion with the required marking shall be avoided.

ASME B16.9 Butt Weld Equal Tee

Equal Tee: All three ports have the same nominal diameter, meaning the main pipe and branch pipes have the same diameter. It is suitable for situations where the flow rates of the main pipe and branch pipes are the same, ensuring relatively balanced fluid velocity across all pipes. It is commonly used in piping systems requiring symmetrical branching, such as certain symmetrically arranged equipment connection pipes.

ASME B16.9 Butt Weld Reducing Tee

Reducing Tee: The nominal diameters of the three ports are different, typically with the main pipe having a larger diameter than the branch pipes. This type of tee is suitable for pipeline systems where both branching and merging occur, while also requiring changes in pipe diameter. It allows flexible adjustment of pipe diameter based on different flow requirements and is widely used in pipeline systems such as oil and natural gas transportation.

SS Butt weld Tee Material

Chemical Composition of ASTM A403 Buttweld Equal Tee

Mechanical Properties of ASTM A403 Buttweld Reducing Tee

Dimension of ASME B16.9 Tee

Applications of Stainless Steel Butt Weld Tee

Petroleum and Natural Gas Industry

Chemical Industry

Food and Pharmaceutical Industry

Power and Energy Industry

Shipbuilding and Marine Engineering

ANSI/ASME B16.9 Buttweld Equal Tee Manufacturer

We are a professional butt weld tee manufacturer equipped with comprehensive production facilities and a rigorous quality management system. Our product range encompasses carbon steel, stainless steel, and alloy steel materials, compliant with international standards such as ASME, DIN, EN, and GB. Whether it’s equal-diameter, reducer, or slant tees, we offer multiple size specifications to meet diverse operational requirements across industries including petroleum, chemical, power generation, and seawater treatment.

Throughout production, we emphasize quality control at every stage—including dimensional inspection, material composition analysis, and weld seam examination—ensuring each product delivers consistent reliability in service. With efficient delivery capabilities and stable product quality, we have established long-term partnerships with numerous domestic and international clients, positioning us as a trusted supplier of pipeline fittings.

If you are seeking a professional and reliable supplier of butt weld tees, please feel free to contact us anytime. We are committed to providing you with premium products and comprehensive services.

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Reducers typically feature a conical or eccentric conical structure. The conical shape may be concentric, where the center axes coincide, or eccentric, where the center axes do not align. Concentric reducers maintain a consistent centerline when pipe diameters change at both ends, making them suitable for applications with strict fluid flow direction requirements and limited installation space. ASME B16.9 reducers are widely used in pipeline systems across petroleum, chemical, natural gas, power, and metallurgical industries. They connect pipes of differing diameters or facilitate directional changes while conserving space.

Butt Weld Reducers Specification

Concentric Reducer

The primary structural feature of concentric reducers is their concentric design. This configuration ensures that the fluid flow direction remains unchanged as it passes through the reducer, maintaining a relatively stable flow state. The defining characteristic of concentric reducers is the perfect alignment of their centerlines at both ends. Viewed from the side, it exhibits a symmetrical conical structure resembling a bell mouth or funnel. This design ensures a smooth transition for the fluid within the pipe, minimizing the generation of vortices and turbulence. This makes it particularly suitable for applications with stringent requirements for fluid flow.

Eccentric Reducer

An eccentric reducer is a pipe fitting used to connect two pipes of different diameters, with its two ends offset from each other. This offset is termed the eccentricity, meaning one side of the fitting is straight while the other tapers gradually at an angle. Unlike symmetrical concentric reducers, the eccentric design aids in controlling fluid flow, reducing turbulence, and preventing gas accumulation or cavitation within the piping system. It is commonly used in applications requiring consistent bottom or top liquid levels in pipelines.

Concentric and Eccentric Reducers

Concentric reducers and eccentric reducers are two common types of pipe fittings used for connecting pipes of different diameters in piping systems. However, due to their structural differences, their respective applications and advantages also vary.

ASME B16.9 Seamless and Welded Reducer

Seamless

Seamless reducers are typically manufactured by forming entire lengths of seamless stainless steel pipe through pressure or push forming. The advantage of this process lies in the absence of welds, resulting in higher overall strength and pressure resistance, making it particularly suitable for demanding environments requiring high pressure and temperature endurance. However, due to the use of solid pipe forming, the available size range is relatively limited, and wall thickness control presents greater challenges.

Welded

Welded reducers are produced by rolling stainless steel plates into a conical shape and then welding them together. This manufacturing method offers greater flexibility, making it especially suitable for producing large-diameter or non-standard-sized products, and it is typically more cost-effective. The primary drawback, however, is the presence of weld seams. Although these undergo rigorous inspection, they may be slightly inferior to seamless reducers in terms of pressure resistance and overall strength.

ASTM A403 Concentric Reducer

Chromium (Cr)

Provides the primary corrosion resistance and oxidation resistance; higher content yields better corrosion resistance.

Nickel (Ni)

Enhances material ductility and toughness, improves corrosion resistance, particularly against acidic media.

Molybdenum (Mo)

Significantly enhances resistance to chloride-induced pitting and crevice corrosion (e.g., seawater). Not present in 304.

Manganese (Mn)

Increases solid solution strength and improves machinability.

Silicon (Si)

Enhances oxidation resistance and improves fluidity.

Tensile Strength: The maximum stress a material can withstand before breaking.

Yield Strength: The maximum stress a material can withstand before undergoing permanent plastic deformation.

Elongation: The percentage increase in length of a material at break, reflecting its plasticity and toughness.

ASTM A234 WPB Concentric Reducer

Chemical Composition

Mechanical Property

ANSI / ASME B16.9 Reducer Dimensions

Concentric Reducer

Eccentric Reducer

Eccentric Reducer Weight

Concentric Reducer Weight

How to Calculate The Weight of Steel Pipe Reducer?

0.02466 × S ×[ (D+d)/2-S] × H / 1000

S: Wall thickness of Butt Weld Reducer

D: Outside diameter of the larger end

d: Outside diameter of the small end

H: End to end dimension

ASME B16.9 Standard

This Standard covers overall dimensions, tolerances, ratings, testing, and markings for factory-made wrought buttwelding fittings in sizes NPS 1/2 through NPS 48 (DN 15 through DN 1200).

Pressure Rating Designation

Class followed by a dimensionless number is the designation for pressure-temperature ratings. Standardized designations for flanges per ASME B16.5 referenced in this Standard are Classes 150, 300, 600, 900, 1500, and 2500.

Marking

Standard Marking Each fitting shall be permanently marked to show the following:

(a) manufacturer’s name or trademark

(b) material identification, either the ASTM or ASME grade designation

(c) schedule number1 or nominal wall thickness in mm

(d) size — the nominal pipe size (NPS) identification number related to the end connections shall be used

(e) compliance—see para. 4.4 for standard and special fitting marking

A manufacturer may supplement these mandatory markings with others, including a DN size designation, but confusion with the required marking shall be avoided.

Packaging

For large-sized or heavy carbon steel pipe reducers, individual packaging or bundling may not provide sufficient support. Therefore, they are typically stacked neatly on large wooden pallets. The wooden pallet provides a sturdy base platform that evenly distributes weight, preventing deformation of the pipe fittings due to uneven stress. Subsequently, forklifts can directly lift the pallets from the bottom, significantly improving loading/unloading efficiency while reducing damage risks associated with manual handling. Fittings of the same specification or batch are grouped together on a single pallet for easier inventory management. Before packaging, plastic pipe caps are installed on both ends of the fittings or they are wrapped with plastic sheeting to protect the beveled edges and inner walls from scratches and prevent dust or moisture ingress.

During packaging, the large and small ends are securely strapped to wooden pallets using steel or nylon strapping to prevent shifting or tipping during transit. This method is particularly suitable for long-distance shipping or export, offering superior protection against damage.

To learn more about carbon steel pipe reducers, please click

Advantages 

Integrally formed with no welded seams, eliminating risks associated with welding defects.

High strength and superior pressure resistance, suitable for demanding operating conditions.

Smooth inner walls with natural transitions minimize turbulence and pressure loss.

Excellent corrosion resistance, commonly manufactured from stainless steel grades such as 304/316L.

Widely applied in petroleum and natural gas, chemical, power generation, offshore engineering, and pharmaceutical industries.

Application

Oil and gas pipeline systems

Chemical and petrochemical plants

Power and nuclear power plant pipelines

Marine engineering and shipbuilding

Pharmaceutical and food processing industries

Water treatment and environmental engineering

Heating and air conditioning (HVAC) systems

Industrial piping for high-pressure, high-temperature, and corrosive media

ASME B16.9 Reducers Manufacturers & Supplier

We are a professional reducer manufacturer, offering high-quality stainless steel, carbon steel, and alloy steel reducers, including concentric reducers and eccentric reducers. Additionally, we produce various butt weld fittings and forged fittings, manufactured strictly in accordance with international standards such as ASME, ANSI, DIN, EN, and GB to ensure dimensional accuracy and reliable performance. Our pipe fittings are widely used in industries such as oil and gas, chemical, power generation, marine, and pharmaceutical, meeting diverse pipeline connection requirements across various operating conditions. Leveraging premium materials, advanced production techniques, and stringent quality control, we provide comprehensive pipe fitting solutions—including reducers, tees, elbows, reducers, and custom fittings—empowering customers to build safe and efficient pipeline systems.

Exported Countries

We Export Reducer to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Egypt,  Europe, Africa, Asia, North America, South America, Middle East.etc,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Egypt,  Europe, Africa, Asia, North America, South America, Middle East.etc

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You can click here to learn more about Incoloy 825 products

What are Incoloy 825 Butt Weld Fittings?

Incoloy 825 is a nickel-iron-chromium alloy with added elements such as molybdenum, copper, and titanium. This unique chemical composition grants it exceptional corrosion resistance in both oxidizing and reducing environments.

Butt-weld fittings are pipe components connected to pipelines via butt welding. This connection method creates a seamless, robust, and leak-proof joint, ensuring the overall integrity of the piping system. It is particularly suitable for high-pressure, high-temperature, or cryogenic environments.

The combination of Incoloy 825 material with butt-welded connections makes Incoloy 825 butt-welded pipe fittings a reliable piping solution capable of delivering dependable performance under extreme corrosion and high-pressure conditions.

Incoloy Alloy 825 Butt weld Fittings Specification

Specifications ASTM B366 / ASME SB366

Dimensions ASME/ANSI B16.9, ASME B16.28, MSS-SP-43, MSS SP-79

Size 1/8” NB TO 48” NB. (Seamless & 100% X-Ray Welded, Fabricated)

Type Seamless / Welded / Fabricated

Bending Radius R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom

Thickness Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS

Grade 825 UNS (N08825), DIN (2.4858)

Equivalent Grades of Incoloy 825 Buttweld Fitting

Chemical Composition of Incoloy 825 Butt weld Fittings

The chemical composition of Incoloy 825 primarily includes elements such as nickel (Ni), chromium (Cr), molybdenum (Mo), and iron (Fe). Its typical composition is: Ni (38-46%), Cr (19.5-23.5%), Mo (2.5-3.5%), Fe (22%). This composition ratio enables the material to maintain high strength and excellent corrosion resistance even in high-temperature environments (up to 900°C).

ASTM B366 UNS N08825 Mechanical Properties

Types of Buttweld Fittings

Butt Weld Elbows:

One of the most commonly used pipe fittings in piping systems, primarily employed to alter the direction of fluid flow. They are connected to pipes or other fittings via butt welding, forming a seamless, robust, and leak-proof structure.

Common elbow types based on bend angle include 45° elbows, 90° elbows, and 180° elbows.

· 45° elbows are suitable for applications requiring a smaller turning angle, enabling pipes to change direction in confined spaces while minimizing fluid flow resistance;

· 90° elbows are the most common type, frequently used for right-angle turns. For instance, in building piping systems, 90° elbows are employed to alter pipe direction at wall corners;

· 180° elbows, also known as U-bends, enable 180° return flow, functioning to redirect fluid back to its starting point or a specific location.

Based on curvature radius, elbows can be further categorized into long radius elbows and short radius elbows.

· Long Radius Elbows: Their bending radius is 1.5 times the pipe diameter (R=1.5D). These elbows offer low fluid resistance and are commonly used where smooth fluid flow is required.

· Short Radius Elbows: Their bending radius equals the pipe diameter (R=1D). These elbows save space and are suitable for installations with limited room, but they present relatively higher fluid resistance.

Butt Weld Tee

A butt weld tee is a common pipe fitting. Its shape resembles a “T,” used to branch secondary pipelines from the main pipeline, thereby achieving fluid diversion or convergence. It connects to pipelines via butt welding, forming a robust, sealed, and continuous structure that ensures no leakage occurs when transporting high-pressure, high-temperature, or corrosive media. Based on whether the three ports have identical diameters, butt-weld tees are categorized into equal-diameter tees (all ports share the same diameter) and reducing tees (where the branch pipe diameter is smaller than the main pipe diameter).

Butt Weld Cross:

A butt weld cross is a specialized pipe fitting shaped like a “cross,” primarily used to connect four pipes at a single point, enabling fluid to diverge or converge in four directions. It features four outlets of identical or different diameters, all connected via welding to ensure a robust, leak-proof pipeline system.

Butt Weld Reducers:

Butt weld reducers, also known as welded reducers, are essential fittings for connecting pipes of differing diameters. They facilitate smooth transitions and flow regulation within piping systems. Based on whether the centerlines of connected pipes align, they are categorized as concentric reducers and eccentric reducers.

Butt Weld Caps:

Welded pipe caps serve as vital end-sealing components for pipeline systems. Their design eliminates internal threads or socket connections, instead utilizing beveled edges for direct butt welding to pipes. This creates seamless, highly sealed ends. Such connections ensure structural integrity, high strength, and superior leak resistance, enabling the system to withstand high-pressure, high-temperature, or corrosive media transport.

Buttweld Stub Ends:

The Buttweld Stub Ends features a flanged design on one end and a welded connection on the other. Paired with a slip-on flange, it enables flexible pipeline connections that are easy to disassemble and install. This configuration is ideal for pipeline connections requiring frequent maintenance or equipment replacement.

Advantages of Incoloy 825 Butt Weld Fittings

High Corrosion Resistance: Stable performance in sulfuric acid, phosphoric acid, alkali solutions, and chloride environments

Strength and Toughness: Maintains excellent properties even in high-temperature and low-temperature conditions

Long Service Life: Reduces maintenance and replacement costs

Standardized Production: Precise dimensions for easy installation and welding

Applications

Chemical processing equipment and acid reaction vessels

Oil and gas industry pipelines and pressure vessels

Seawater desalination and marine engineering

Pharmaceutical and food processing equipment

Heat exchangers, evaporators, and heating systems

You can get an offer for products in below material forms:

-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)

-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )

-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)

-Round bar , Billet (ASTM A276, ASTM A479)

– Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)

-Bolting, Nuts（ASTM A193, A194, A320）

Incoloy 825 Butt Weld Fittings Exported Countries

We Export Incoloy 825 Butt Weld Fittings to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Egypt,  Europe, Africa, Asia, North America, South America, Middle East.etc

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What is a concentric reducer?

The primary structural feature of a concentric reducer is its concentric design. This structure ensures that the flow direction of the fluid remains unchanged as it passes through the reducer, maintaining a relatively stable flow state. The characteristic of a concentric reducer lies in the fact that the centerlines of its two ends (the larger and smaller openings) are perfectly aligned. When viewed from the side, it exhibits a symmetrical conical structure, resembling a bell or funnel. This design ensures smooth fluid transition within the pipeline, minimizing the generation of vortices and turbulence, making it particularly suitable for applications with stringent requirements for fluid flow.

Differences Between Concentric and Eccentric Reducers

The primary difference between concentric reducers and eccentric reducers lies in the position of the centerlines at both ends: the centerlines of a concentric reducer are aligned on the same straight line, forming a symmetrical conical shape, suitable for vertical pipes or applications requiring high fluid symmetry; whereas the centerlines of an eccentric reducer are not aligned on the same straight line, with one side transitioning in a straight line, commonly used in horizontal pipes to prevent gas accumulation or liquid stagnation.

Concentric Reducer Specification

Features of Stainless Steel Concentric Reducers

High Corrosion Resistance: The composition of stainless steel makes it resistant to corrosion from a wide range of chemical media, making it ideal for use in industries such as the chemical, petroleum, and food processing.

Hygienic and Non-Toxic: The smooth surface resists bacterial growth and is easy to clean, meeting food-grade and sanitary standards.

High Strength and Durability: Withstands high pressures and temperatures for a long service life.

Excellent Weldability: Easily welds to stainless steel pipes, creating a tightly sealed piping system.

Concentric Reducer Weight Calculation Formula

The steel pipe reducer weight formula is 0.02466 * S <(D+d)/2 – S> * H / 1000
D = Large end diameter in mm.
d = Small end diameter in mm.
S = Large end Thickness in mm.
H = Height from end to end.

If we want to calculate the weight by formula, we need to know above 4 factors. Where can you get them? Usually we get the them from pipe reducer dimensions.

ASME B16.9 Concentric Reducer Dimension

ASME B16.9 Concentric Reducer Weight

Stainless Steel Concentric Reducer Manufacturing Process:

1. Hot Rolling (Extruded Seamless Steel Tubing): Round tube blank → Heating → Piercing → Three-roll oblique rolling, continuous rolling, or extrusion → De-burring → Sizing (or reducing diameter) → Cooling → Straightening → Hydrostatic testing (or non-destructive testing) → Marking → Storage

Hot rolling is a processing method performed above the recrystallization temperature of the metal material. For stainless steel, this typically means temperatures exceeding 1000°C. The stainless steel tube blank is heated to high temperatures and then repeatedly rolled through rollers to reduce its diameter and thin its wall thickness, ultimately forming the desired-sized tubing.

2. Cold drawing (rolling) seamless steel tubes: Round tube blank → Heating → Piercing → Heading → Annealing → Acid washing → Oil coating (copper plating) → Multiple cold drawing (cold rolling) → Blank tube → Heat treatment → Straightening → Hydrostatic testing (inspection) → Marking → Storage.

Cold drawing is performed below the recrystallization temperature, typically at room temperature. Using hot-rolled tubes as raw material, the tubes are drawn through a die to further reduce their diameter and wall thickness. To ensure smooth drawing operations, annealing is typically performed between drawing intervals.

How to make a reducer？

Reducers are pipe fittings designed to meet pipe diameter requirements. Common forming processes include reducing/expanding, or both. Stamping can also be used for certain reducer sizes.

a. Reducing/Expanding Forming

The reducing/expanding forming process involves placing a tube blank of the same diameter as the larger end of the reducer into a die. Pressing is performed along the tube blank’s axial direction, causing the metal to move along the die cavity and shrink. Depending on the size of the reduced diameter, this process can be performed in a single press or multiple presses.

b. Stamping

In addition to using steel pipe as raw material to produce reducers, some sizes can also be produced using steel plate using a stamping process. The die used for drawing is designed based on the reducer’s inner surface dimensions. The blanked steel plate is then stamped and stretched using the die.

Common Applications

Chemical and petrochemical industries

Food and beverage processing

Pharmaceutical industry

Water treatment and desalination

Oil and gas transportation

Pulp and paper and sugar industries

Marine and offshore engineering

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Types of Buttweld Fittings

Buttweld Elbow: 

One of the most commonly used fittings in piping systems, primarily used to change the direction of fluid flow. They are connected to pipes or other fittings via butt welding, forming a seamless, sturdy, and leak-proof structure.

Based on the bending angle, common types include 45° elbows, 90° elbows, and 180° elbows.

· 45° elbows are suitable for scenarios requiring a smaller angle of turn, enabling pipes to change direction in a compact space and reduce fluid flow resistance.

· 90° elbows are the most common type, often used at right-angle turns, such as in building plumbing systems where 90° elbows are employed to redirect pipes at wall corners;

· 180° elbows, also known as U-bends, enable pipes to make a 180° return, playing a role in processes where fluid needs to be redirected back to the starting point or a specific location.

Based on curvature radius, elbows can be further classified into long-radius elbows (Long Radius Elbow) and short-radius elbows (Short Radius Elbow).

· Long Radius Elbow: Its bending radius is 1.5 times the pipe diameter (R=1.5D). This type of elbow has low fluid resistance and is commonly used in applications requiring smooth fluid flow.

· Short Radius Elbow: Its bending radius is equal to the pipe diameter (R=1D). This type of elbow is space-efficient and suitable for applications with limited installation space, but it has relatively higher fluid resistance.

Buttweld Tee

A buttweld tee is a common type of pipe fitting. It is shaped like a “T” and is used to branch off a secondary pipe from the main pipeline, thereby achieving the diversion or convergence of fluid flow. It is connected to the pipeline via butt welding, forming a sturdy, sealed, and continuous structure to ensure no leakage occurs during the transportation of high-pressure, high-temperature, or corrosive media. Welded tees are classified into equal tees (all ports have the same diameter) and reducing tees (the branch pipe diameter is smaller than the main pipe diameter) based on whether the three ports have the same diameter. They are widely used in various industrial pipeline systems such as petroleum, chemicals, power, and construction.

Buttweld Cross:

Buttweld cross is a special type of welded pipe fitting shaped like a “cross,” primarily used to connect four pipes at a single point, enabling fluid to diverge or converge in four directions.crosses have four outlets of the same or different diameters, all designed for welded connections to ensure a robust, leak-proof pipeline system.

Buttweld Reducers:

Buttweld reducers, also commonly referred to as welded reducer pipes, are an important type of welded pipe fitting primarily used to connect two pipes of different diameters, facilitating smooth transition and flow adjustment of the fluid medium within the pipeline system. They are directly welded to the pipes via their beveled ends, forming a secure, leak-proof connection that aligns flush with the inner wall of the pipe, thereby reducing fluid resistance. Based on whether the centerlines of the connected pipes are aligned, butt-welded reducers can be classified into concentric reducers and eccentric reducers.

Buttweld Caps:

Buttweld caps are an important type of pipe connection component primarily used to seal the ends of pipe systems. Their design features no internal threads or socket connections but instead uses a beveled groove to directly butt-weld with the pipe, forming a seamless and highly sealed end. This connection method ensures the structural integrity, high strength, and excellent leak-proof performance of the pipe system, enabling it to withstand the transmission of high-pressure, high-temperature, or corrosive media.

Buttweld Stub Ends

One end of the lap joint stub end features a flanged design with a flange, while the other end is welded to the pipeline. It is used in conjunction with a loose flange, enabling more flexible pipe connections that are easy to disassemble and install. This configuration is suitable for pipe connections that require frequent maintenance or equipment replacement. In the piping systems of offshore oil drilling platforms, where equipment requires regular maintenance and replacement, the combination of lap joint stub ends and loose flanges is widely adopted, effectively enhancing maintenance efficiency.

Material & Grades of Buttweld Fittings 

Carbon Steel Buttweld Fittings:

ASTM A234 WPB / WPC,ASTM 420 WPL 3 / 6 / 9,A860 WPHY 42 / 46 / 52 / 56 / 65 / 70   

Alloy Steel Buttweld Fittings:

A234 WP5 / WP9 / WP11 / WP12 / WP22 /WP 91 / WP92

Stainless Steel Buttweld Fittings:

A403 WP304/304L/304H – WP316/316L – WP317 – WP310S – WP321 – WP347 – WP904L

Duplex & Super Duplex Steel Buttweld Fittings:

A815 WPS32205/32750/31803/32760

Manufacturing Method of Buttweld Fittings

Manufacturing Methods for Elbows

1. Hot Push Forming Method (Hot Push Forming)  

The pipe material is heated to a certain temperature, then pushed through a die to bend it, while simultaneously performing diameter compensation forming. This method is suitable for medium to large diameter, thick-walled elbows, offering high forming efficiency and good continuity of fiber structure.

2. Cold Bending Method

A specialized bending machine is used to bend straight pipes at room temperature.

Manufacturing Methods for Tees

1. Hydraulic Bulging Method

Hydraulic oil is injected into a closed pipe section, causing the middle section to expand into a tee branch. This method ensures uniform wall thickness and is suitable for thin-walled pipes.

2. Hot Extrusion Method

The tube blank is heated, and the branch opening is punched out from the side using a specialized die, followed by die shaping. This method can produce large-diameter, thick-walled tees.

Manufacturing Methods for Reducers

The tube material is placed in a reducer die and pressed into a reducer shape using hydraulic or mechanical pressure.

Manufacturing Methods for Pipe Caps (Cap):  

Mostly produced using press forming or integral stamping. For thick-walled pipe caps, multiple stamping operations or welding may be required.  

Manufacturing Methods for Lap Joint Stub Ends

Generally produced using a combination of machined flanging and welded short tubes, or through integral forging or press forming.

Advantages of Buttweld Fittings

High weld strength and robust structure

Leak-resistant with excellent sealing performance

Smooth transition at connections with minimal fluid resistance

Capable of withstanding high-temperature and high-pressure environments

Long service life and low maintenance costs

Application Areas

Petroleum refining plant pipeline systems

Natural gas transmission pipelines

Power plant boilers and heat exchange systems

Chemical process pipelines

Food and pharmaceutical clean systems (stainless steel material)

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ZIZI is a professional manufacturer and processor of pipes and fittings, dedicated to providing high-quality products for core sectors such as chemical, petroleum, natural gas, water conservancy, electric power, and marine engineering. We offer a comprehensive range of pipes and fittings, including seamless pipes, welded pipes, butt weld fittings, high-pressure forged fittings, and flanges. Crucially, we also possess strong capabilities in producing machined parts, allowing us to customize products to meet specific client requirements. Our materials expertise covers a wide array, including carbon steel, stainless steel, alloy steel, low-temperature steel, duplex steel, and nickel-based alloys, ensuring we can satisfy demanding application needs across various harsh operating conditions.

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ASTM A815 UNS S31803 Pipe Fitting Dimension Inspection

Outer Diameter (OD): Measure the outer diameter at both ends of the fitting to ensure it meets tolerance requirements.

Wall Thickness (WT): Measure the wall thickness at various points on the fitting (especially the outer and inner arcs of elbows, and the transition sections of reducers) to ensure it falls within the permissible deviation.

ASTM A815 UNS S31803 Pipe Fittings Specification

ASTM A815 UNS S31803 Chemical Composition

ASTM A815 UNS S31803 Mechanical Property

Equivalent Grades of ASTM A815 Duplex Steel Buttweld Fittings

Duplex S31803 Buttweld Pipe Elbow Dimension

Application Areas

Oil and gas industry: especially offshore platforms, gas gathering pipelines, crude oil and natural gas processing equipment, dealing with corrosive environments with high chloride ions and hydrogen sulfide.

Chemical and petrochemical industries: chlor-alkali industry, fertilizer production, acid treatment, seawater cooling systems, etc., dealing with various highly corrosive chemical media.

Desalination: Pipeline, pump and valve systems, resisting corrosion from high-concentration chloride seawater.

Pollution control equipment: Flue gas desulfurization (FGD) systems, handling hot and humid flue gas containing chlorides and sulfur oxides.

Pulp and paper industry: Equipment and pipelines in bleaching plants, resisting corrosion from chlorine-containing bleaching agents.

Structural applications: Structural components that require high strength and corrosion resistance.

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The ASTM A815 standard provides specifications for various types of butt weld fittings, including elbows, tees, reducers, caps, crosses, and more. These fittings are produced in a range of sizes and dimensions to meet the diverse needs of different industries and applications.

ASTM A815 Pipe Fittings Specification

ASTM A815 Standard Scope

This specification covers two general classes, WP and CR, of wrought ferritic, ferritic/austenitic, and martensitic stainless steel fittings of seamless and welded construction covered by the latest revision of Specification A960/A960M. Fittings differing from these standards may be furnished in accordance with Supplementary Requirement S58 of Specification A960/A960M.

This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable “M” specification designation [SI units], the material shall be furnished to inch-pound units.

ASTM A815 Pipe Fittings Material

ASME A815 Duplex Steel Butt weld Fittings Equivalent Grades

Chemical Composition of ASTM A815 Butt weld Fittings

Chromium is one of the most important alloying elements in ASTM A815 Pipe Fittings. It can form a dense oxide film (passivation film) on the surface of steel, thereby improving the corrosion resistance of steel.

Nickel is an austenite-forming element that can expand the austenite phase area and enable stainless steel to maintain an austenite structure at room temperature.

Molybdenum can significantly improve the resistance of stainless steel to pitting corrosion, crevice corrosion and stress corrosion cracking.

Nitrogen is an effective austenite-forming element and also increases the strength and corrosion resistance of stainless steel.

Mechanical Properties of ASTM A815 Pipe Fittings

The two-phase structure of duplex stainless steel makes it stronger than ordinary austenitic stainless steel. This makes duplex stainless steel ASTM A815 pipe fittings perform well in high-pressure and high-load applications, such as in high-pressure pipeline systems in the fields of petrochemicals, natural gas transportation, etc., which can reduce pipeline wall thickness and reduce costs while ensuring the safe operation of the pipeline system.

Physical Properties of ASTM A815 Pipe Fittings

Performance characteristics

High strength: The two-phase structure of duplex stainless steel makes it have higher strength than ordinary austenitic stainless steel. This makes duplex stainless steel butt weld pipe fittings perform well in high-pressure and high-load application scenarios.

Good corrosion resistance: ASTM A815 pipe fittings has the corrosion resistance advantages of ferritic stainless steel and austenitic stainless steel, and has good resistance to a variety of corrosive media. In the chemical industry, it can resist the erosion of various acid and alkali media to ensure the safety and stability of chemical production.

Excellent welding performance: ASTM A815 Duplex stainless steel has good welding performance and is not prone to defects such as thermal cracks during welding. This is very important for the manufacture of butt-welded pipe fittings, which can ensure the welding quality and the overall performance of the pipe fittings.

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