3. ASME B16.9 fittings

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Caps

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Description

Pipe Caps are a type of pipe fitting used to close the end of a pipe, preventing liquids or gases from escaping the pipe. They are commonly used in water, oil, gas, and chemical piping systems.

Applications

Pipe caps are widely used in various industries:

Oil and Gas Industry: Used in crude oil, natural gas, and petroleum product pipelines.
Chemical Industry: Used to seal chemical pipelines in production and processing plants.
Water and Wastewater Industry: Used in clean water supply and wastewater treatment systems.
Food and Beverage Industry: Used to seal pipelines carrying food and beverages, ensuring food safety and hygiene.
HVAC Systems (Heating, Ventilation, and Air Conditioning): Used to block air flow in air conditioning systems.

Standards

ASME B16.9: This is the standard of the American Society of Mechanical Engineers (ASME) for welded pipe fittings. Pipe caps made to this standard must meet specific requirements for dimensions, materials, and pressure ratings.

Material: Carbon steel, stainless steel, copper alloy, aluminum, plastic.
Size: Suitable for pipe diameters from DN15 (1/2″) to DN1200 (48″).
Connection Type: Welded, threaded, or flanged.
Working Pressure: Depending on the material and manufacturing standards, it can range from 150 psi to 2500 psi or higher.

Dimensions and Thickness of Cap according to ASME B16.9

Kích thước danh nghĩa (NPS)	Đường kính ngoài (OD)	Độ dày thành (SCH 40)
1/2	21.34 mm	2.77 mm
3/4	26.67 mm	2.87 mm
1	33.40 mm	3.38 mm
1 1/4	42.16 mm	3.56 mm
1 1/2	48.26 mm	3.68 mm
2	60.33 mm	3.91 mm
2 1/2	73.03 mm	5.16 mm
3	88.90 mm	5.49 mm
3 1/2	101.60 mm	5.74 mm
4	114.30 mm	6.02 mm
5	141.30 mm	6.55 mm
6	168.28 mm	7.11 mm
8	219.08 mm	8.18 mm
10	273.05 mm	9.27 mm
12	323.85 mm	9.52 mm
14	355.60 mm	9.52 mm
16	406.40 mm	10.31 mm
18	457.20 mm	11.13 mm
20	508.00 mm	12.70 mm
24	609.60 mm	14.27 mm

Notes:

Wall Thickness: Determined according to SCH 40 (Schedule 40). Other thicknesses may apply depending on specific system requirements.
Outside Diameter (OD): The outside diameter of the pipe, including the pipe wall.

Material Summary Table of Caps

Material Type	Common Standard	Main Characteristics	Applications
Carbon Steel	ASTM A234, ASME B16.9	High strength, good pressure resistance, low cost	Oil and gas, chemical, water systems
Stainless Steel	ASTM A403, ASME B16.9	Corrosion resistance, oxidation resistance, suitable for harsh environments	Food, chemical, pharmaceutical industries
Alloy Steel	ASTM A234 WPB, WPC	Higher heat and pressure resistance than carbon steel, better wear resistance	Oil and gas, chemical industries
Copper	ASTM B62	Good corrosion resistance, good electrical and thermal conductivity, easy to work with	Water and gas piping systems
Aluminum	ASTM B241, B361	Lightweight, good corrosion resistance, easy to work with, good thermal and electrical conductivity	Aerospace, automotive, food industries
Plastic (PVC, CPVC)	ASTM D2467, F439	Lightweight, good corrosion resistance, good electrical insulation, low cost	Water supply and chemical systems
Nickel Alloy Steel	ASTM B366	High corrosion resistance, good heat resistance, suitable for harsh environments and strong chemicals	Chemical, oil and gas, energy industries
Titanium	ASTM B363	Lightweight, extremely durable, very good corrosion resistance, high temperature resistance	Aerospace, medical, chemical industries