Applications

Water supply systems: Used in plumbing, wastewater and water related applications.

Oil and gas industry: Used in oil and gas pipeline systems.

Chemical Industry: Used to connect pipes during the production and transportation of chemicals.

HVAC Systems: Used in heating, ventilation and air conditioning systems.

Standards

ASME B16.11 is the American Society of Mechanical Engineers standard for threaded pipe fittings used in high pressure systems.

Material: Usually made from carbon steel, stainless steel, copper or plastic, depending on application requirements and usage environment.
Nominal Pipe Size (NPS): The standard covers nominal sizes from 1/8″ to 4″.
Wall Thickness: Clearly specified to ensure pressure resistance and mechanical strength of fittings.
Tolerances: Specify dimensional tolerances for each type of accessory to ensure consistency and accurate assembly.
Pressure and temperature: The standard specifies the pressure and temperature levels that the fitting can withstand. These levels vary depending on the size and material of the fitting.

Threaded Coupling Dimensions and Thickness Table according to ASME B16.11

Kích thước danh nghĩa (NPS)	Chiều dài (A)	Đường kính ngoài (OD)	Đường kính trong (ID)	Độ dày thành ống (Min. Wall Thickness)
1/2″	42 mm	21.34 mm	15.00 mm	3.73 mm
3/4″	48 mm	26.67 mm	20.00 mm	3.91 mm
1″	51 mm	33.40 mm	25.00 mm	4.55 mm
1 1/4″	54 mm	42.16 mm	32.00 mm	4.85 mm
1 1/2″	57 mm	48.26 mm	38.00 mm	5.08 mm
2″	64 mm	60.33 mm	50.00 mm	5.54 mm
2 1/2″	76 mm	73.03 mm	62.00 mm	7.01 mm
3″	83 mm	88.90 mm	75.00 mm	7.62 mm
4″	95 mm	114.30 mm	100.00 mm	8.56 mm

Note:

Length (A): Total length of the joint.
Outside diameter (OD): The outside diameter of the coupling.
Inside Diameter (ID): The inside diameter of the fitting (the part that contacts the pipe).
Pipe wall thickness (Min. Wall Thickness): Minimum thickness of pipe wall to ensure pressure resistance.

Threaded Coupling Material Summary

Material Type	Description	Popular Applications
Carbon steel	– Most popular material, low cost.	– Water supply system, oil and gas, HVAC.
	– High durability, good load bearing capacity.	– Industrial piping systems, fire fighting systems.
Stainless Steel	– Good corrosion resistance, durable in harsh environments.	– Food and pharmaceutical industry.
	– There are many types such as 304, 316 with different corrosion resistance.	– Water and chemical systems, applications requiring high hygiene.
Alloy Steel	– Contains alloy components such as Chrome, Molybdenum.	– High pressure and temperature systems, steam systems.
	– Heat and pressure resistance.	– Oil and gas, chemical industry.
Copper	– Good thermal and electrical conductivity, corrosion resistance.	– Water supply, cooling, HVAC systems.
	– Easy to process and install.	– Air conditioning systems, duct systems in buildings.
Aluminum	– Light, good corrosion resistance.	– Applications in light industries, non-high pressure water systems.
	– Not suitable for high pressure applications.	– Water supply system in food and pharmaceutical industry.
Plastic	– Light weight, anti-corrosion, low cost.	– Waste water system, irrigation system.
	– Cannot withstand high temperature and pressure.	– Light industrial and civil applications.
Nickel Alloy	– Good corrosion resistance in acidic and alkaline environments.	– Chemical and petroleum industry.
	– High heat and pressure resistance.	– Applications requiring high durability and corrosion resistance, such as chemical pipeline systems.
Inconel, Monel, Hastelloy	– Special alloys with superior corrosion and heat resistance.	– Special applications in chemical industry, oil and gas and harsh environments.

Note:

Carbon steel: Suitable for high pressure and normal temperature applications. Low cost, easy to process and install.
Stainless Steel: Good corrosion resistance, suitable for applications requiring high cleanliness and corrosion resistance.
Alloy Steel: Used for applications requiring high heat and pressure resistance.
Copper: Good thermal and electrical conductivity, corrosion resistance, suitable for water and cooling systems.
Aluminum: Light weight, good corrosion resistance, but cannot withstand high pressure and temperature.
Plastic: Light weight, low cost, cannot withstand high pressure and temperature.
Nickel Alloy: Good corrosion resistance in acidic and alkaline environments, high heat and pressure resistance.
Inconel, Monel, Hastelloy: Special alloys with superior corrosion and heat resistance, used in harsh environments.

4. ASME B16.11 Forged steel fittings

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Threaded Coupling

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Description

Applications

Standards

Threaded Coupling Dimensions and Thickness Table according to ASME B16.11

Kích thước danh nghĩa (NPS)

Chiều dài (A)

Đường kính ngoài (OD)

Đường kính trong (ID)

Độ dày thành ống (Min. Wall Thickness)

1/2″

42 mm

21.34 mm

15.00 mm

3.73 mm

3/4″

48 mm

26.67 mm

20.00 mm

3.91 mm

1″

51 mm

33.40 mm

25.00 mm

4.55 mm

1 1/4″

54 mm

42.16 mm

32.00 mm

4.85 mm

1 1/2″

57 mm

48.26 mm

38.00 mm

5.08 mm

2″

64 mm

60.33 mm

50.00 mm

5.54 mm

2 1/2″

76 mm

73.03 mm

62.00 mm

7.01 mm

3″

83 mm

88.90 mm

75.00 mm

7.62 mm

4″

95 mm

114.30 mm

100.00 mm

8.56 mm

Threaded Coupling Material Summary

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