Features of Stainless Steel Butt Weld Cap

zhao77jie — Wed, 10 Jul 2024 10:14:28 +0000

Stainless steel butt weld cap is made of stainless steel material. It fixed at the end of the pipeline by welding to seal the pipeline. Its function is the same as that of a pipe plug. As an important pipeline connection accessory, it plays an important role in multiple fields.

Specification of Stainless Steel Butt Weld Cap

Size	1/2” – 48” / DN15 – 1200
Thickness	SCH 10 – SCH 160, XXS
Dimensions	ANSI / ASME B16.9 / MSS SP 43/JIS B2311/2312/2313/DIN2605/2615/2616/EN10253
Stainless Steel	ASTM A403 WP304/304L/304H, 316/316L, 310S, 317,347,904L
Duplex Stainless Steel	ASTM A815 S32205, S31803, 32750, 32760

Standard

There are various production standards for butt weld cap internationally. ASME B16.9 is a standard developed by the American Society of Mechanical Engineers (ASME) . It specifies requirements for the size, material, pressure rating, marking, and inspection of welded pipe components.

Dimension of ASME B16.9 Stainless Steel Butt Weld Cap

DN	NPS	OD	E	E1
15	1/2	21.3	25	25
20	3/4	26.7	25	25
25	1	33.4	38	38
32	11/4	42.2	38	38
40	11/2	48.3	38	38
50	2	60.3	38	44
65	21/2	73.0	38	51
80	3	88.9	51	64
90	31/2	101.6	64	76
100	4	114.3	64	76
125	5	141.3	76	89
150	6	168.3	89	102
200	8	219.1	102	127
250	10	273.0	127	152
300	12	323.8	152	178
350	14	355.6	165	191
400	16	406.4	178	203
450	18	457.0	203	229
500	20	508.0	229	254
550	22	559.0	254	254
600	24	610.0	267	305
650	26	660.0	267	—
700	28	711.0	267	—
750	30	762.0	267	—
800	32	813.0	267	—
850	34	864.0	267	—
900	36	914.0	267	—
950	38	965.0	305	—
1000	40	1016.0	305	—
1050	42	1067.0	305	—
1100	44	1118.0	343	—
1150	46	1168.0	343	—
1200	48	1219.0	343	—

The size range of butt weld cap is wide, suitable for various pipeline system requirements. Therefore widely used in industries such as petroleum, chemical, natural gas, and construction.

ASTM A403 Butt Weld Cap

ASTM A403 is the material standard for stainless steel butt weld cap, commonly used stainless steel materials include WP304/316/904L/31254/321, etc.

Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N	Cu
ASTM A403 WP304	MIN						8.0	18.0
ASTM A403 WP304	MAX	0.08	2.00	0.045	0.030	1.00	11.0	20.0
ASTM A403 WP316	MIN						10.0	16.0	2.00
ASTM A403 WP316	MAX	0.08	2.00	0.045	0.030	1.00	14.0	18.0	3.00
ASTM A403 WP904L	MIN						23.00	19.00	4.00		1.00
ASTM A403 WP904L	MAX	0.02	2.00	0.045	0.035	1.00	28.00	23.00	5.00	0.10	2.00
ASTM A403 WP31254	MIN						17.50	19.50	6.00	0.18	0.50
ASTM A403 WP31254	MAX	0.02	1.00	0.030	0.010	0.80	18.50	20.50	6.50	0.25	1.0
ASTM A403 WP321	MIN						9.00	17.00
ASTM A403 WP321	MAX	0.08	2.00	0.045	0.030	1.00	12.00	19.00

Mechanical Properties

MATERIAL	ASTM A403 WP304	ASTM A403 WP316	ASTM A403 WP904L	ASTM A403 WP31254	ASTM A403 WP321
T.S (MPA)	515 min	515 min	490 min	650-820	515 min
Y.S (MPA)	205 min	205 min	220 min	300 min	205 min
EL %	28 min	28 min	28 min	28 min	28 min

Structural Characteristics of Butt Weld cap

Diversified shape design
Sturdy welded structure
Good sealing performance
Good corrosion resistance
High standard size specifications
Strict manufacturing and testing processes

Difference Between Stainless Steel Butt Weld Cap and Plug

Stainless Steel Butt Weld Cap

Stainless Steel Plug

Although stainless steel butt weld cap and plugs are sealing components in pipeline systems. They have significant differences in structure, use, and installation methods.

There are significant differences in the structure, purpose, and installation method between stainless steel butt weld caps and plugs. Butt weld caps are more suitable for situations that require high strength and good sealing. But plugs are more suitable for situations that require quick installation or disassembly. When selecting, appropriate components should be selected based on specific usage environments and requirements.

Application

Stainless steel butt weld cap is widely used in multiple fields due to their excellent corrosion resistance and high strength.
Petrochemical Industry
Nuclear Power
Mechanical
Medical Equipment

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