Butt Weld Stub End Reduce The Risk Of Pipeline Leakage

Butt weld stub ends are a type of pipe fitting that provides better sealing performance for pipelines. By welding the stub end onto the steel pipe, it eliminates the need to flange the pipe itself. Instead, it utilizes the matching between the raised stub end provided by the stub end and the groove to achieve a strong connection and seal. This method is more flexible and convenient, and is suitable for various pipeline connection needs. There are two basic forms of stub ends: long butt weld stub ends and short butt weld stub ends.

Specifications
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Specification

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Butt weld short stub end
Butt weld long stub end

The length of the butt weld short stub end is relatively short, suitable for low pressure, low temperature, non-critical applications, etc.
Butt weld short stub end is connected to the pipeline by welding, and has good sealing performance and strength, and can withstand high pressure and temperature.
Made of stainless steel, duplex steel, or special alloy steel, it has corrosion resistance and can resist corrosion media such as oxidation, acidity, alkalinity, and salt solution.

Installation Dimensional Drawing

Butt weld short stub end installation dimension drawing

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Table 1: Butt Weld Short Stub End Dimensions
Nominal Diameter		Outer Diameter OD (mm)	Length F (mm)	Diameter of Lap G (mm)	Corner Radius (mm)		(Type E) Theoretical Weight kg/pc
DN	NPS	Outer Diameter OD (mm)	Length F (mm)	Diameter of Lap G (mm)	A Max	B Max	sch5S	Sch10S	Sch40S
15	1/2	21.3	50.8	35.1	3	0.75	0.049	0.062	0.079
20	3/4	26.7	50.8	42.9	3	0.75	0.064	0.081	0.101
25	1	33.4	50.8	50.8	3	0.75	0.082	0.134	0.160
32	1-1/4	42.4	50.8	63.5	5	0.75	0.109	0.178	0.225
40	1-1/2	48.3	50.8	73.2	6	0.75	0.129	0.213	0.279
50	2	60.3	63.5	91.9	8	0.75	0.204	0.338	0.471
65	2-1/2	73.0	63.5	104.6	8	0.75	0.313	0.448	0.740
80	3	88.9	63.5	127.0	10	0.75	0.400	0.574	1.01
90	3-1/2	101.6	76.2	139.7	10	0.75	0.522	0.650	1.38
100	4	114.3	76.2	157.2	11	0.75	0.606	0.870	1.68
125	5	141.3	76.2	185.7	11	1.5	0.985	1.21	2.08
150	6	168.3	88.9	215.9	13	1.5	1.34	1.64	3.37
200	8	219.1	101.6	269.7	13	1.5	1.96	2.65	5.67
250	10	273.1	127	323.9	13	1.5	3.57	4.38	9.55
300	12	323.9	152.4	381.0	13	1.5	5.85	6.74	13.8
350	14	355.6	152.4	412.8	13	1.5	6.55	7.49	16.88
400	16	406.4	152.4	469.9	13	1.5	7.778	8.797	–
450	18	457.2	152.4	533.4	13	1.5	9.009	10.252	–
500	20	508	152.4	584.2	13	1.5	11.102	13.202	–
550	22	559	152.4	641.4	13	1.5	12.763	14.779	–
600	24	610	152.4	692.2	13	1.5	16.132	18.476	–

The length of the butt weld long stub end is relatively longer, providing a larger connection area and stronger connection strength.
It is suitable for applications with high requirements such as high pressure, high temperature, and high load.
Butt weld long stub end is connected to pipelines by welding, and has good sealing performance and strength, and can withstand high pressure and temperature.
Made of stainless steel, duplex steel, or special alloy steel, it has corrosion resistance and can resist corrosion media such as oxidation, acidity, alkalinity, and salt solution.

Installation Dimensional Drawing

Butt weld long stub end installation dimension drawing

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Table 2: Butt Weld Long Stub End Dimensions
Nominal Diameter		Outer Diameter OD(mm)	Length F (mm)	Diameter of Lap G (mm)	Corner Radius (mm)		(Type E) Theoretical Weight kg/pc
DN	NPS	Outer Diameter OD(mm)	Length F (mm)	Diameter of Lap G (mm)	A Max	B Max	sch5S	Sch10S	Sch40S
15	1/2	21.3	76.2	35.1	3	0.75	0.067	0.084	0.106
20	3/4	26.7	76.2	42.9	3	0.75	0.087	0.109	0.144
25	1	33.4	101.6	50.8	3	0.75	0.144	0.233	0.279
32	1-1/4	42.4	101.6	63.5	5	0.75	0.188	0.307	0.386
40	1-1/2	48.3	101.6	73.2	6	0.75	0.219	0.358	0.467
50	2	60.3	152.4	91.9	8	0.75	0.406	0.667	0.924
65	2-1/2	73.0	152.4	104.6	8	0.75	0.626	0.893	1.465
80	3	88.9	152.4	127.0	10	0.75	0.781	1.117	1.954
90	3-1/2	101.6	152.4	139.7	10	0.75	0.896	1.283	2.35
100	4	114.3	152.4	157.2	11	0.75	1.024	1.474	2.822
125	5	141.3	203.2	185.7	11	1.5	2.153	2.635	4.957
150	6	168.3	203.0	215.9	13	1.5	2.591	3.174	6.482
200	8	219.1	203.2	269.7	13	1.5	3.409	4.607	9.819
250	10	273.1	254.0	323.9	13	1.5	6.389	7.843	17.023
300	12	323.9	254.0	381.0	13	1.5	8.922	10.275	21.075
350	14	355.6	304.8	412.8	13	1.5	11.571	13.912	–
400	16	406.4	304.8	469.9	13	1.5	14.216	16.078	–
450	18	457.2	304.8	533.4	13	1.5	16.216	18.453	–
500	20	508	304.8	584.2	13	1.5	19.984	23.764	–
550	22	559	304.8	641.4	13	1.5	22.81	26.413	–
600	24	610	304.8	692.2	13	1.5	28.839	33.028	–

Functions

Butt weld stub ends are connected to the pipeline for connection and sealing.

By welding the stub end onto the steel pipe, it achieves pipe connection without flanging the pipe itself, thus providing a strong connection and seal.

In addition to welding with the pipeline, butt weld stub end often works with loose flanges as pipeline fittings. By matching with loose flanges, it achieves quick disassembly and installation, which is convenient for repairing and replacing the pipeline.

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