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MSS SP-97 Weldolet

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MSS SP – 97 weldolet is a pipe fitting used for branch pipe connection in pipeline system. It plays an important role in pipeline engineering in many industrial fields such as petroleum, chemical, electric power, shipbuilding, etc.
The structural design of weldolet is to ensure the reliability and safety of the connection between branch pipe and main pipe. It usually has a main pipe connection end and a branch pipe connection end. The main pipe connection end is welded to the main pipe by butt welding. This welding method can provide high-strength connection and effectively transfer pressure, temperature and fluid load in the pipeline system.
MSS SP – 97 specifies the detailed dimensional standards of weldolet, including the tolerance range of key dimensions such as main pipe outer diameter, branch pipe outer diameter, wall thickness, length, etc. These dimensional standards ensure that butt-weld branch pipe sockets produced by different manufacturers are interchangeable in size, which facilitates the selection and replacement of pipe fittings during the design, installation and maintenance of pipeline systems.

Specification of Weldolet Fittings

Size Range	1/8″ – 24″ / DN6 – DN600
Schedule Chart	STD, XS, SCH 160
Standard	MSS SP-97
Carbon Steel	ASTM A105 / A105N
Low Temp Carbon Steel	ASTM A350 LF2 / LF3
Pipeline Steel	ASTM A694 F42 / 46 / 56 / 60 / 65
Alloy Steel	ASTM A182 F11 / 12 / 5 / 9 / 91 / 92 / 22
Stainless Steel	ASTM A182 F304/304L/304H, 316/316L, 310S, 317, 347, 904L, 321
Duplex Stainless Steel	ASTM A182 F51, F53, F44

MSS SP-97 Weldolet Dimensions

Run pipe Nominal Size		Branch Nominal Size		Length			OD of Fitting			Cut hole Dia.
Run pipe Nominal Size		Branch Nominal Size		A			D			d
DN	NPS	DN	NPS	STD	XS	SCH160	STD	XS	SCH	STD	XS	SCH160
8~900	1/4~36	6	1/8	16	16	–	24	24	–	16	16	–
10~900	3/8~36	8	1/4	16	16	–	26	16	–	16	16	–
15~900	1/2~36	10	3/8	19	19	–	30	30	–	19	19	–
20~900	3/4~36	15	1/2	19	19	28	36	36	36	24	24	14
25~900	1~36	20	3/4	22	22	32	43	43	46	30	30	19
32~900	11/4~36	25	1	27	27	38	55	55	51	36	36	25
40~900	11/2~36	32	11/4	32	32	44	66	66	63	45	45	33
50~900	2~36	40	11/2	33	33	51	74	74	71	51	51	38
65~900	21/2~36	50	2	38	38	55	90	90	82	65	65	43
80~900	3~36	65	21/2	41	41	62	104	104	98	76	76	54
90~900	31/2~36	80	3	44	44	73	124	124	122	93	93	73
100~900	4~36	90	31/2	48	48	–	138	138	–	113	113	–
125~900	5~36	100	4	51	51	84	154	154	154	120	120	98
150~900	6~36	125	5	57	57	94	187	187	188	141	141	122
200~900	8~36	150	6	60	78	105	213	227	222	170	170	146
250~900	10~36	200	8	70	99	–	265	292	–	220	220	–
300~900	12~36	250	10	78	94	–	323	325	–	275	265	–
350~900	14~36	300	12	86	103	–	379	381	–	325	317	–
400~900	16~36	350	14	89	10	–	411	416	–	257	361	–
450~900	18~36	400	16	94	106	–	465	468	–	408	403	–
500~900	20~36	450	18	97	111	–	522	525	–	459	455	–
550~900	22~36	500	20	102	119	–	573	584	–	508	509	–
650~900	26~36	600	24	116	140	–	690	708	–	614	612	–

Application of MSS SP-97 Weldolet

Oil and gas industry

In the wellhead equipment of oil and gas, weldolet are used to connect various branch pipes, such as the connecting branch pipes of pressure gauges, thermometers, safety valves and other equipment. The pipeline system at the wellhead faces high pressure and complex fluid composition (including oil, gas, water and possible impurities). MSS SP-97 weldolet can ensure the reliability of the connection between these branch pipes and the main pipe, prevent leakage, and ensure the safe operation of the wellhead equipment.

Power industry

In the steam piping system of thermal power plants, weldolet are used to connect branch pipes, such as the branch pipes that may need to be connected to the temperature and pressure monitoring equipment on the steam supply pipe to the steam turbine, and the branch pipes used for steam sampling and analysis. In the primary and secondary circuit piping systems of nuclear power plants, weldolet are used to connect the branch pipes of various monitoring and control equipment. Due to the special safety requirements of nuclear power plants, the piping system must ensure extremely high reliability and sealing.

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