Spigot and socket joints in B31.3???
Spigot and socket joints in B31.3???
(OP)
We have located a number of spigot and socket joints on a 60+ year old 300NS steam line. Basically normal pipe end inserted into a belled pipe end (socket) and then closed with a fillet weld. Does anyone know if we can possibly qualify this type of joint against B31.3? Any help on the limitations of this joint type would be a good start!
Regards
Jay
Regards
Jay





RE: Spigot and socket joints in B31.3???
RE: Spigot and socket joints in B31.3???
Properly socket-welded fittings are permitted by ASME B31.3...
However, this piping code puts limitations on:
- the fitting to be used (typically dimensioned to ANSI B16.11)
- the size and type of fillet weld
- the maximum piping diameter, typically 3"NPS
- the type of fluid service, lethal and flammable service sometimes excluded by clients
I doubt if your 60 year old piping system was built to any piping code......I seem to remember that ASA B31.1 was first published in the early 1940's
MJC
RE: Spigot and socket joints in B31.3???
RE: Spigot and socket joints in B31.3???
Here are some standards, but not limited to be studied in detail to find solution for your case
API SPEC 5L Line Pipe
ASME B31.3 Process Piping
ASME SEC IIC Welding Rods, Electrodes and Filler Metals
ASME SEC V Nondestructive Examination
ASME SEC IX Welding and Brazing Qualifications
ASTM E92 Vickers Hardness of Metallic Materials
ASTM A833 Indentation Hardness of Metallic Materials by Comparison Hardness Testers
Biju V H