Zizi is manufacturer of ASME B16.5 forged steel pipe fittings and offers Weld Neck Flange RF in different dimensions.

What is a Weld Neck Flange?

It is very easy to identify a weld neck flange from the appearance because it has a high, tapered hub like a neck. This neck will be welded with pipe so it has the same wall thickness as pipes. It also has the effect of dispersing pressure, making the pipe less deformable.

There are two designs for weld neck flange RF: a regular types we often used with pipes, the other is long hub type which is suitable for process plant.

Raised Face Weld Neck Flange resistant to extreme temperature,high pressure and withstand hostile environments. It is also a ideal choice when the media in pipeline is expensive, flammable or explosive.

What is Raised Face Flange?

Raised face is one kind of seal type of flanges, it means the gasket surface is higher than bolting circle face. This seal face is the most common used one not only among weld neck flanges. What’s more, the height of raised face is changing based on the diameter of flanges. By the way, the seal face is on the opposite of the hub side.

Weld Neck Flange B16.5 Dimensions & Material

Diameter: 1/2 to 24”

Pressure: Class 150, 300, 600, 900, 1500, 2500

Seal: RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint)

Schedule for Seal: Depends on wall thickness of pipes.

Stainless Steel Raised Face Weld Neck Flange

ASTM A182 F304/304L, F306/316L, F309, F31, F317, F321, F347,F454L, ASTM A312/A403 TP304, TP304L, TP316, TP316L

Duplex & Super Duplex Steel Raised Face Weld Neck Flange

ASTM A 182 – F 51, F53, F55 S 31803, S 32205, S 32550, S 32750, S 32760, S 32950.

Carbon Steel Raised Face Weld Neck Flange

ASTM/ ASME A 105, ASTM/ ASME A 350 LF 2, ASTM / ASME A 53 GR. A & B, ASTM / ASME A 691, ASTM A 106 GR. A, B & C. API 5L GR. B, X 42, X 46, X 52, X 60, X 65

Alloy Steel Raised Face Weld Neck Flange

ASTM / ASME A 182, ASTM / ASME A 335 F1, F5, F9, F11, F12, F22, F23, F91, ASTM / ASME A 691 GR 1 CR, 1 1/4 CR, 2 1/4 CR, 5 CR, 9CR, 91

Copper Alloy Steel Raised Face Weld Neck Flange

 ASTM / ASME SB 111 UNS NO. C10100 , C10200 , C10300 , C10800 , C12000, C12200, C70600 C71500, ASTM / ASME SB 466 UNS NO. C70600 , C71500

Nickel Alloy Raised Face Weld Neck Flange

ASTM / ASME SB 336, ASTM / ASME SB 564 / 160 / 163 / 472, NICKEL 200, NICKEL 201, MONEL 400 , ALLOY 20 / 20 CB 3, INCONEL825, INCONEL 600, INCONEL 601, INCONEL 625, HASTELLOY C 276

Weld Neck Flange Standard Specification

ASME B16.5

Size: 1/2 inch to 24 inches

Pressure: 150#, 300#, 600#, 900#, 1500#, 2500#

ASME B16.5 is a widely recognized and used standard published by the American Society of Mechanical Engineers (ASME). This standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and methods for specifying openings for pipe flanges and flanged fittings.

ASME B16.47A

Size: 26 inches to 60 inches

Pressure: 150#, 300#, 400#, 600#, 900#

ASME B16.47 A covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for large-diameter steel pipe flanges from NPS 26 to NPS 60. Compared to the B series, these flanges are typically thicker, heavier, and feature larger bolt circles and bolt sizes. They are generally considered more robust and capable of withstanding greater external loads.

ASME B16.47B

Size: 26 inches ~ 60 inches

Pressure: 75#, 150#, 300#, 400#, 600#, 900#

The ASME B16.47 standard covers two series of large-diameter steel flanges, one of which is ASME B16.47B, titled “Large Diameter Steel Flanges: NPS 26 to NPS 60 Metric/Inch Standard.” These flanges are typically lighter and thinner, with smaller bolt circles and bolt sizes, requiring more but smaller fasteners.

EN 1092-1

Size: DN 10 to DN 4000

Pressure: PN 2.5, 6, 10, 16, 25, 40, 63, 100, 160, 250, 400

EN 1092-1 is the European standard for steel circular flanges used to connect piping systems and equipment. This standard applies to flanges for pipes, valves, fittings, and other piping components, and is widely adopted in Europe and internationally.

JIS B2220

Size: 10A ~ 1500A

Pressure: 5K, 10K, 16K, 20K, 30K, 40K

JIS B2220 is a Japanese Industrial Standard (JIS) for steel pipe flanges. This standard is published by the Japanese Standards Association (JSA).

IN 2631 to DIN 2635

Size: DN 10 ~ DN 1000+

Pressure:

They are German Industrial Standard (DIN) that specifies welding neck flanges . This type of flange attaches to a piping system by butt welding the pipe directly to the flange neck. This design provides excellent stress distribution and is suitable for higher pressure and temperature applications.

Quality Control

As ISO certified company, we pay a great attentive on the quality. We take a standard inspection to guarantee the quality.

1. Marking
2. Surface
3. Dimension
4. Material (MTC)

Tack DN25 Class 600 ASTM A182 F304 Weld Neck Flange RF as an example.

1. The marking should correct, clear and beautiful, such as “DN25 600# Weld Neck RF SS304 B16.5 831”.
2. Hand touch and visual check to ensure the surface is even and smooth.
3. Measure the outside diameter, thickness, raised face diameter and other values according to the dimension chart and compare those value with torelance.
4. To prove the quality of material, we will offer you MTC (Mill Test Certificate) for every time.

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