Butt Weld Cap Prevents Fluid Leakage

Butt weld cap is a commonly used pipe fitting, also known as pipe cap or pipe head. Its main function is to seal the end of the pipe to prevent fluid leakage and external substances from entering the pipe, and ensure the safe operation of the pipeline system. It is usually circular and matches the outer diameter of the pipe. It is connected to the end of the pipe by welding. Due to the strong welding connection, it can withstand high pressure and temperature, and maintain reliable sealing performance.

ade of stainless steel, duplex steel, or special alloy steel, it has excellent corrosion resistance and can resist corrosion media such as oxidation, acidity, alkalinity, and salt solutions.

Size range: DN15–DN3000, 1/2"–120".

Specifications
Functions
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Specification

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Butt weld cap installation dimensional drawing

Butt weld cap dimensional drawing

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Table 1: Butt Weld Cap Dimensions
Nominal Diameter		Outer Diameter (mm)	Distance from Back to End Face (mm)		Theoretical Weight (kg/pc) (Type E)
DN	NPS	OD	E	E₁	sch5S	sch10S	sch40S/STD	sch40	sch80S/XS	sch80
15	1/2	18	25	25	0.019	0.024	0.031	0.031	0.042	0.042
15	1/2	21.3	25	25	0.022	0.028	0.037	0.037	0.050	0.050
20	3/4	25	25	25	0.027	0.033	0.045	0.045	0.060	0.060
20	3/4	26.7	25	25	0.029	0.035	0.048	0.048	0.065	0.065
25	1	32	38	38	0.049	0.083	0.101	0.101	0.136	0.136
25	1	33.7	38	38	0.052	0.087	0.106	0.106	0.143	0.143
32	1-1/4	38	38	38	0.058	0.088	0.126	0.126	0.173	0.173
32	1-1/4	42.4	38	38	0.065	0.110	0.141	0.141	0.193	0.193
40	1-1/2	45	38	38	0.071	0.118	0.158	0.158	0.218	0.218
40	1-1/2	48.3	38	38	0.076	0.127	0.169	0.169	0.234	0.234
50	2	57	38	44	0.094	0.156	0.221	0.221	0.313	0.313
50	2	60.3	38	44	0.099	0.165	0.234	0.234	0.331	0.331
65	2-1/2	76	38	51	0.167	0.241	0.409	0.409	0.555	0.555
65	2-1/2	73.0	38	51	0.161	0.232	0.393	0.393	0.534	0.534
80	3	89	51	64	0.254	0.367	0.660	0.660	0.917	0.917
90	3-1/2	101.6	64	76	0.355	0.512	0.965	0.965	1.36	1.36
100	4	108	64	76	0.387	0.561	1.11	1.11	1.58	1.58
100	4	114.3	64	76	0.410	0.594	1.17	1.17	1.67	1.67
125	5	133	76	89	0.769	0.945	1.82	1.82	2.65	2.65
		139.7			0.808	0.993	1.91	1.91	2.78	2.78
		141.3			0.817	1.00	1.93	1.93	2.81	2.81
150	6	159	89	102	1.07	1.31	2.74	2.74	4.22	4.22
		168.3			1.13	1.39	2.90	2.90	4.47	4.47
		165.2			1.11	1.36	2.85	2.85	4.39	4.39
200	8	219	102	127	1.76	2.38	5.19	5.19	8.05	8.05
200	8	216.1	102	127	1.74	2.35	5.13	5.13	7.95	7.95
250	10	273	127	152	3.36	4.14	9.15	9.15	12.5	16.3
250	10	267.4	127	152	3.29	4.05	8.96	8.96	12.2	16.4
300	12	325	152	187	5.12	6.40	13.5	14.6	17.9	28.3
		323.9			5.11	6.39	13.3	14.4	17.7	27.1
		318.5			5.02	6.27	13.2	14.2	17.3	26.8
350	14	377	165	191	6.00	8.46	16.9	19.9	22.5	38.5
350	14	355.6	165	191	5.66	7.87	15.9	18.8	21.2	35.2
400	16	426	178	203	6.93	7.91	21.0	28.2	28.0	52.0
400	16	406.4	178	203	6.60	7.53	20.0	20.0	26.7	49.1
450	18	478	203	229	7.90	9.01	26.9	43.8	35.8	76.1
450	18	457.2	203	229	7.52	8.58	25.6	41.4	34.1	69.1
500	20	529	229	254	10.5	12.02	33.2	57.6	44.2	103
500	20	508.0	229	254	10.1	11.7	31.9	54.0	42.5	93.7
550	22	559	254	254	12.1	22.6	38.8	78.3	51.7	116
600	24	630	267	305	14.8	16.9	46.5	92.3	61.9	177
600	24	610	267	305	14.3	16.4	45.1	90.1	60.1	160
650	26	660	267	–	23.3	26.1	50.5	103.5	67.3	–
700	28	720	267	–	27.1	32.4	56.9	151.1	75.6	–
700	28	711	267	–	38.7	49.7	56.2	121.3	74.9	–
750	30	762	267	–	41.4	51.7	62.1	117.3	82.8	–
800	32	820	267	–	43.4	58.3	70.6	127	92.0	–
800	32	813	267	–	43.1	57.7	70.0	126	91.2	–
850	34	864	267	–	57.2	68.5	78.7	144	105	–
900	36	920	267	–	60.3	74.6	86.6	172	115	–
900	36	914	267	–	59.1	72.1	85.7	171	114	–

Functions

Butt weld pipe caps are used to seal the end of a pipe to prevent pipeline leakage.

Butt weld caps can effectively prevent the leakage of media in the pipeline to the external environment. Especially when transporting liquids or gases in the pipeline, the sealing performance of butt weld caps must make sure that the media will not leak accidentally, thereby guaranteeing the safety of the system. It can also effectively prevent external substances such as dust, impurities, and moisture from entering the pipeline, thereby avoiding contamination of the media inside the pipeline. This is very important for applications that require maintaining the purity of the media or avoiding external influences.

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