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4. ASME B16.11 Forged steel fittings

Threaded Hex Nipple

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Description

A Threaded Hex Nipple is a pipe fitting that is threaded at both ends and has a hexagonal center. It is typically made from materials such as stainless steel, carbon steel, brass, or other alloys. The thread diameter can vary depending on the requirements of the piping system. The hexagonal part makes it easy to use tools to tighten or loosen during installation or removal.

Applications

  • Industrial piping systems: Used to connect pipe sections together in systems for supplying water, gas, oil and other liquids.
  • Oil and gas industry: Used in oil and gas pipeline systems.
  • Chemical industry: Used in chemical transport systems.
  • Food and beverage industry: Used in liquid food and beverage conveying systems.

Standards 

ASME B16.11 is the standard for threaded and socket-weld fittings for high-pressure piping systems. This standard covers requirements for materials, design, dimensions, tolerances, testing, and inspection for pipe fittings.

  • Size: Threaded Hex Nipples are manufactured in nominal sizes from 1/2 inch to 4 inches.
  • Materials: Carbon steel, alloy steel, stainless steel, brass and other copper alloys
  • Working Pressure and Temperature: ASME B16.11 threaded fittings are designed to withstand pressures up to 3000 psi (class 3000) and 6000 psi (class 6000) at working temperatures up to 1000°F (538°C), depending on the material and specific design. Lower pressure classes such as 2000 psi (class 2000) are also available for specific applications.

Threaded Hex Nipple Dimensions and Thickness Chart According to ASME B16.11

Nominal Size (NPS)

Outside diameter (OD)

Overall Length (OAL)

Thread length (T)

Hex thickness (H)

1/2 inch

0.84 inches

2.00 – 3.50 inches

0.53 inches

0.875 inches

3/4 inch

1.05 inches

2.25 – 3.75 inches

0.56 inches

1.062 inches

1 inch

1.32 inches

2.50 – 4.00 inches

0.68 inches

1.312 inches

1-1/4 inches

1.66 inches

2.75 – 4.50 inches

0.71 inches

1.625 inches

1-1/2 inches

1.90 inches

3.00 – 5.00 inches

0.73 inches

1.875 inches

2 inches

2.38 inches

3.25 – 5.50 inches

0.75 inches

2.375 inches

2-1/2 inches

2.88 inches

3.50 – 6.00 inches

0.81 inches

2.875 inches

3 inches

3.50 inches

3.75 – 6.50 inches

0.87 inches

3,500 inches

4 inches

4.50 inches

4.00 – 7.00 inches

0.94 inches

4,500 inches

Note:

  • OD (Outside Diameter): Outer diameter of Threaded Hex Nipple.
  • OAL (Overall Length): The overall length of the Threaded Hex Nipple from end to end.
  • T (Thread Length): Length of the thread part.
  • H (Hex Height): Thickness of the hexagonal part in the middle.

Summary table of common materials used to manufacture Threaded Hex Nipple according to ASME B16.11 standard

Material Material standards Main application Characteristic
Carbon steel ASTM A105 Industrial and oil and gas pipeline systems High pressure, medium temperature, low cost
Stainless Steel ASTM A182 (Gr. F304, F316) Chemical, food, pharmaceutical industry Anti-corrosion, heat resistant, easy to clean
Alloy steel ASTM A182 (Gr. F11, F22) Petrochemical industry, power plants High heat resistance, high pressure, chemical corrosion resistance
Brass ASTM B62 Water systems, marine industry Good corrosion resistance, easy to process, moderate durability
Nickel alloy ASTM B564 (Gr. UNS N06600) Chemical, thermal power, oil and gas industry High corrosion resistance, high temperature resistance, high durability
Inconel ASTM B564 (Gr. UNS N06625) Aviation, oil and gas, chemical industry Extremely high temperature resistance, good corrosion resistance
Monel ASTM B564 (Gr. UNS N04400) Marine, chemical, oil and gas industry High corrosion resistance, especially in marine environments
Copper-nickel alloy ASTM B466 Marine industry, brine Good corrosion resistance, high durability in salt water environment

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