Pipe Caps, Pipe Plugs and Blind Flanges, all of them have the same function that sealing the pipeline.

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Pipe Caps

They are a Pipe Fittings that cover the pipe end to block off the pipeline. They are divided into Butt Weld Cap, Socket Weld Cap, Threaded Cap by connection type.

ASME B16.11 is the standard for Forged Socket Weld Cap and Forged Threaded Cap.

Forged ASME B16.11 Caps are suitable for serving small diameter pipes. They have Beautiful Appearance and Good Mechanical Properties, which belong to the best quality pipe fittings.

Butt Weld Caps are complied with ASME B16.9. They are not forgings but wrought pipe fittings. ASME B16.9 Caps can be divided into seamless pipe cap and welded pipe cap. Welded end cap should be take flaw detection. And service for large diameter pipes.

Socket Weld Cap Dimension

Socket Weld Cap Dimension

Threaded Cap Dimension

Threaded Cap Dimension

Butt Weld Cap Dimension

Butt Weld Cap Dimension

Pipe Plug

Steel Pipe Plug is a pipe fitting that is inserted into the pipe end. It has male threaded type only. And can be divided into Hexagon Head Plug, Round Head Plug and Square Head Plug. Head shape influences its weight.

Threaded plug is ASME B16.11 Forged Fittings. But it is not classified by pressure ratings.

Threaded Plug Dimension

Threaded Plug Dimension

Pipe Plug Weight  

Blind Flange

They are covered at the end of the pipe and connected by bolts and gasket. Compare with other forged flanges, it has bolt holes only. But they are all ASME B16.5 Flanges.

Spectacle Blind

Spectacle Blind is one kind of blind flanges with 8 shape. It has a blind plate at one side, and the other side is a throttling ring which does not has throttling effect actually. The throttle end can be used when normal operation is required and to fill the installation clearance.

ASME B16.5 Blind Flanges Dimension

ASME B16.5 Blind Flange Dimension

Difference between Pipe Cap and Pipe Plug and Blind Flange

1. These Pipe Caps and Threaded Plugs are pipe fittings, blind flange is pipe flange.
2. Standard.
3. Size range and pressure rating. Butt weld cap has the largest size range and Schedule. And then Blind Flange.
4. Connection way.
5. Blind flange is tightly sealed and easy to disassemble. Others have to be cut off when they are removed.

What is ASME Standard?

ASME Standards cover the specifications, tolerances, marking, and testing requirement for pipes fittings and flanges.

For ASME B16.11 that covers forged socket weld and threaded pipe fittings.

While ASME B16.9 is for wrought factory-made butt-welding pipe fittings.

For ASME B16.5, it is forged flange standard.

They are all American standards and approved by American Society of Mechanical Engineering.

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ASME B16.11 Forged Steel Fittings are made by the round steel or ingot by forging which including socket weld fittings and threaded fittings.

It covers 45 Degree Elbow, 90 Degree Elbow, Equal Tee, Reducing Tee, Cross Tee, Full Coupling, Half Coupling, Pipe Cap, Socket Weld Union and Swage Nipple.

Forged Steel Elbow

Socket Weld Elbow and Threaded Elbow

Types : 45° Elbow and 90° Elbow

Pressure: 3000LB, 6000LB, 9000LB.

Material: Carbon Steel, Alloy Steel, Stainless Steel, Duplex Steel.

Steel Pipe Tee

Socket Weld Tee and Threaded Tee

Types : Equal Tee, Reducing Tee, Cross and Barrel Tee.

Pressure: 3000#, 6000#, 9000#

Material: Carbon Steel, Alloy Steel, Stainless Steel, Duplex Steel.

Forged Steel Coupling

Socket Weld Coupling and Threaded Coupling

Types : Half Coupling and Full Coupling. Straight Coupling and Reducing Coupling.

Pressure: Class 3000, 6000, 9000.

Material: Carbon Steel, Alloy Steel, Stainless Steel, Duplex Steel.

Steel Pipe Cap

Socket Weld Cap and Threaded Cap

Connection: Butt Weld Cap, Socket Weld Cap and Threaded Cap .

Function: Seal pipeline end.

Material: Carbon Steel, Alloy Steel, Stainless Steel, Duplex Steel.

Steel Pipe Plug

Threaded Plug

Plug is used at the end of the pipe to prevent leakage.

Types: Hex Head Plug, Square Head Plug, Round Head Plug.

Material: Carbon Steel, Alloy Steel, Stainless Steel, Duplex Steel.

Forged Steel Unions

Socket Weld Union and Threaded Union

Type: Concentric Swaged Nipple and Eccentric Swaged Nipple.

Material: Carbon Steel, Alloy Steel, Stainless Steel, Duplex Steel

Threaded Bushing

Hex Head Bushing

They usually made of hexagonal rod after cutting and forging. It is convenient to strengthen and tighten because hex head shape,

Pipe Nipple

Swaged Nipple

Usually used in the connection of different diameter pipeline.

Type: Concentric Swaged Nipple and Eccentric Swaged Nipple.

Material: Carbon Steel, Alloy Steel, Stainless Steel, Duplex Steel

Forged Steel Outlet Fittings

Sockolet, Weldolet and Threadolet

It is a reinforced pipe fitting for branch connection, can replace the use of reducing tee, reinforcement plate. The advantages of Pipe Olets are safety and reliable, low cost, simple construction, fixed parameters and easy to design and use. It is increasingly widespread used in pipes with high pressure, high temperature, large diameter, thick wall, and replaces traditional branch connection way.

Threaded Short Nipple

Forged threaded pipe fittings adopts NPT (taper pipe thread) used for British pipe only, not metric pipe.

ASME B16.11 Forged Steel Fittings Dimensions

Forged Steel Fittings

Specification

DN6, DN8, DN10, DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100. And customer specifications usually between DN15 to DN50.

Pressure

The pressure rating are 3000LB/SCH80, 6000LB/SCH160, 9000LB/XXS, and threaded elbow pressure rating are 2000LB, 3000LB and 6000LB.

Application

ASME B16.11 Forged Steel Fittings are commonly serves in the areas of petrochemical, pharmaceutical, power, aerospace, military, fire fighting, metallurgy, shipbuilding, gas, nuclear power, and environmental protection which require high pressure bearing capacity and precise size.

NPT & BSP Threaded Fittings

1) ISO7/1 is the international common thread seal pipe thread, thread angle is 55o, conicity is 1:16. Internal thread has Rp and Rc two types, while external only has cone-shape R. Besides, Rp-R is more active compares with Rc-R .

2)ISO228 is the international general non – thread seal pipe thread (British Standard Pipe Thread), thread angle is 55o, internal and external thread are both Rp.

3)ANSI B1.20.1 is American thread seal pipe thread, thread angle is 60o (NPT), conicity is 1:16. Both internal and external thread are Rc. It  frequently serves in high temperature and high pressure pipeline.

AMSE B16 11 forged fittings use NPT more often. Though thread angle is different, NPT and ISO7/1 (BSP) can connect with each other in the diameter of 1/2 and 3/4 because of their same thread pitch.

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