Buttweld Pipe Fitting Specification & Standards

Welded pipe fittings are made as per ASME spec B16.9. ASME B16.9 covers factory made wrought steel butwelding fittings in sizes 1/2" to 48". This standard however does not cover low pressure corrosion resistant buttwelding fittings.

ASTM A234 WPB is the Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service.

Specifications 

A234 WPB is the most common material used for carbon steel butt welded fittings.

WPB Chemical Composition(%)

Grade

C

Mn

P

S

Si

Cr

Mo

Ni

Cu

Others

max

max

WPB

0.3

0.29-1.06

0.05

0.058

0.1

0.4

0.15

0.4

0.4

V 0.08

(1,2,3,4,5)

max

min

max

max

max

max

max

In ASME/ANSI standard, butt welding pipe fittings technical requirements are specified in the standard ASME/ANSI B16.9, including all the types of pipe fittings. In EN standard, it is EN10253 standard for the butt welding pipe fittings.

In JIS, DIN, Ghost standard, different type of butt welding fittings are in different standard number. For example, JIS B2311, B2312, B2313  or GOST 17373, GOST 17375, GOST 17376, GOST 17378 etc.

There are also some other standards about butt welding pipe fittings like:

Common type of Butt weld pipe fittings

A common example using welded pipe fitting is a pipe reduced by concentric reducer, welded to a weld neck flange and connected to an equipment. Figure below represent complete collection of butt welded pipe fitting




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