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4. ASME B16.11 Forged steel fittings

Threaded Reducing Coupling

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Description

Threaded Reducing Coupling is a type of pipe fitting used to connect two pipes of different sizes using threads. This product has a large end and a small end, both of which are threaded to connect to the corresponding pipes. Commonly used materials include carbon steel, stainless steel, copper, or aluminum alloy. The product comes in many different sizes and standards to suit many different applications.

Applications

  • Oil and gas piping system: Used to connect oil and natural gas pipes of different sizes.
  • Water supply and drainage system: Used in water supply and drainage systems of buildings and factories.
  • Chemical systems: Used in chemical plants to conduct various chemicals.
  • Energy industry: Used in thermal power plants, hydroelectric power plants, and other energy systems.
  • Food and beverage industry: Used in food and beverage processing plants to ensure food hygiene and safety.

Standards

ASME B16.11 Standard for Threaded Reducing Coupling specifies the technical and dimensional requirements for threaded pipe fittings.

  • Materials: Fittings shall be constructed of carbon steel, alloy steel, or stainless steel, and shall comply with the material requirements of ASTM A105, A182, or other equivalent standards.
  • Dimensions and tolerances: The dimensions and tolerances of Threaded Reducing Coupling are clearly defined in the standard, including outside diameter, length, thread depth, and reduction size.
  • Working Pressure: ASME B16.11 fittings are designed to withstand specific maximum working pressures, typically 2000, 3000, 6000 psi (equivalent to Class 2000, 3000, 6000).

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

Nominal size (inches)

Large outside diameter (OD) (inch)

Small Outside Diameter (OD) (inch)

Overall length (inches)

Large wall thickness (inches)

Small wall thickness (inches)

1/2 x 3/8

0.84

0.675

1.75

0.109

0.091

3/4 x 1/2

1.05

0.84

2.25

0.113

0.109

1 x 3/4

1,315

1.05

2.5

0.133

0.113

1 1/4 x 1

1.66

1,315

2.75

0.14

0.133

1 1/2 x 1 1/4

1.9

1.66

3.0

0.145

0.14

2 x 1 1/2

2,375

1.9

3.25

0.154

0.145

2 1/2 x 2

2,875

2,375

3.75

0.203

0.154

3 x 2 1/2

3.5

2,875

4.0

0.216

0.203

4 x 3

4.5

3.5

4.5

0.237

0.216

5 x 4

5,563

4.5

5.0

0.258

0.237

6 x 5

6.625

5,563

5.5

0.28

0.258

8 x 6

8,625

6.625

6.5

0.322

0.28

10 x 8

10.75

8,625

7.5

0.365

0.322

12 x 10

12.75

10.75

8.5

0.375

0.365

14 x 12

14.0

12.75

9.0

0.375

0.375

16 x 14

16.0

14.0

10.0

0.375

0.375

18 x 16

18.0

16.0

11.0

0.375

0.375

20 x 18 

20.0

18.0

12.0

0.375

0.375

24 x 20

24.0

20.0

13.0

0.375

0.375

 

Material summary table for Threaded Reducing Coupling:

Material Type Material Standards Characteristic
Carbon steel ASTM A105 High durability, good pressure resistance, often used in oil, gas, and water transmission systems.
Stainless Steel ASTM A182 Good corrosion resistance, high durability, suitable for applications in the food industry, chemicals, and marine environments.
Alloy steel ASTM A350 Withstands high temperatures and high pressures, commonly used in low and high temperature applications.
Ductile Iron ISO 49 Good corrosion resistance, high ductility, commonly used in water supply and drainage and gas conduction systems.
Copper ASTM B62 Good electrical and thermal conductivity, corrosion resistance, commonly used in water supply and oil pipeline systems.
Aluminum alloy ASTM B241 Light weight, good corrosion resistance, high strength, commonly used in oil, gas and light water transmission systems.

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