ASTM A105 Carbon Steel Cap

ASTM A105 Carbon Steel Cap is a vital component in piping systems across various industries. ASTM A105 is a standard specification for forged carbon steel piping components used in pressure systems at ambient and higher-temperature service conditions. A105 Carbon Steel Caps are forged fittings made from this material, designed to close off pipe ends, ensuring no leakage or flow beyond the termination point.

Key Features of ASTM A105 Carbon Steel Caps

• Material Strength: ASTM A105 Carbon Steel exhibits high tensile and yield strength, making the caps robust and reliable under varying pressure conditions.
• Versatility: Suitable for use in high-temperature and high-pressure environments.
• Durability: Resists wear and tear, ensuring long service life.
• Corrosion Resistance: Offers moderate corrosion resistance, especially when coated or treated.

ASTM A105 Dimensions

Carbon Steel End Cap Sizes 

• 20 mm: O.D. (D) = 508 mm, length (H) = 229 mm
• 22 mm: O.D. (D) = 559 mm, length (H) = 254 mm
• 24 mm: O.D. (D) = 610 mm, length (H) = 267 mm
• 26 mm: O.D. (D) = 660 mm, length (H) = 267 mm

NPS	O.D.	LENGTH	LENGTH
	D	H	H1
1/2	21.3	25	25
3/4	26.7	25	25
1	33.4	38	38
1.1/4	42.2	38	38
1.1/2	48.3	38	38
2	60.3	38	44
2.1/2	73	38	51
3	88.9	51	64
3.1/2	101.6	64	76
4	114.3	64	76
5	141.3	76	89
6	168.3	89	102
8	219.1	102	127
10	273	127	152
12	323.8	152	178
14	355.6	165	191
16	406.4	178	203
18	457	203	229
20	508	229	254
22	559	254	254
24	610	267	305
26	660	267	…
28	711	267	…
30	762	267	…
32	813	267	…
34	864	237	…
36	914	267	…
38	965	305	…
40	1016	305	…
42	1067	305	…
44	1118	343	…
46	1168	343	…
48	1219	343	…

ASTM A105 Tolerance

Nominal Pipe Size (NPS)	Outside Ø at Bevel	Inside Ø at End	Wall Thickness	Overall Length E
			t / t1
1/2 a 2 1/2	1	0,8	Not	4
3 a 3 1/2	1	1,6	less	4
4	1	1,6	than	4
5 a 6	2	1,6	87,50%	7
8	2	1,6	of nominal	7
10	1	3,2	thickness	7
12 a 18	+4 -3	3,2	–	7
20 a 24	+6 -5	4,8	–	7
26 a 30	2	4,8	–	10
32 a 48	2	4,8	–	10

Manufacturing Standards and Compliance

ASTM A105 Carbon Steel Caps adhere to strict international standards, ensuring quality and reliability. Key standards include:

1. ASTM A105/A105M: Governs the material and manufacturing process.
2. ASME B16.9: Outlines dimensions and tolerances for factory-made wrought fittings.
3. ANSI B16.11: Specifies forged fittings like caps for socket-weld and threaded connections.

Applications

ASTM A105 Carbon Steel Caps are widely used in various industries due to their versatility and robustness. Common applications include:

• Oil and Gas Industry:

1. 1. • Closing pipe ends in refineries and offshore platforms.
      • Suitable for pipelines transporting oil, gas, and other hydrocarbons.

• Petrochemical Industry:

1. 1. • Used in chemical processing plants where high-pressure containment is crucial.

• Power Plants:

1. 1. • Applied in steam and water piping systems.
      • Suitable for use in high-temperature environments.

• Shipbuilding:

1. 1. • Essential in marine piping systems, ensuring secure closures.

• Water Treatment Plants:

1. 1. • Used in water pipelines to manage flow termination and maintenance.

• General Construction:

1. • Closing off structural pipe ends in construction frameworks.

Surface Treatment and Coating

To enhance corrosion resistance and extend the service life, ASTM A105 Carbon Steel Caps may undergo the following treatments:

• Galvanization:

1. 1. • Zinc coating to prevent rust.

• Painting:

1. 1. • Epoxy or enamel coatings for additional protection.

• Pickling and Passivation:

1. • Removes surface impurities, enhancing resistance to corrosive environments.

Comparison with Other Standards

Standard	Material Type	Applications
ASTM A106	Seamless Carbon Steel	High-temperature piping systems
ASTM A234 WPB	Wrought Carbon Steel	Fittings for pressure systems
ASTM A216 WCB	Cast Carbon Steel	Valves and flanges

Conclusion

The ASTM A105 Carbon Steel Cap is a robust, versatile, and cost-effective solution for sealing pipe ends in high-pressure and high-temperature systems. Its compliance with international standards, combined with excellent mechanical properties, makes it a preferred choice across industries. By understanding its specifications, applications, and best practices, professionals can ensure optimal performance and longevity of piping systems.