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The DISTANCE BETWEEN WELDS

I have heard this addressed as 1 pipe diameter, two pipe diameters, 5 heat affected zones etc. With the ASME Boiler and pressure Vessel Code Section I , there is NO restriction on the distance between circumferential butt welds. There may be in other codes and standards. I would be interested in knowing if there is an engineering reason for this restriction when it is put in place. Corrosion, Strength?

All code interpretations were provided with permission from C-Spec using their Turbo INT software.

Interpretation: B31.3-7-02

Subject: B31.3-1987, Paras. 304.3.3 and

328; Spacing of Welds

Date Issued: May 24, 1988

File: B31-87-039

Question: In accordance with B31.3, are there

requirements or guidelines on the minimum distance

between welds in a pipe?

Reply: No, except as provided in paragraph

304.3.3(e).

And B31.1

Interpretation: B31.1-22-7

Subject: B31.1, 127.4, Welding

Requirements

Date Issued: December 10, 1992

File: B31-92-027

Question: Does the B31.1 Code require that a

minimum distance be maintained between adjacent

piping welds.

Reply: No. However, refer to paragraph

104.3.1(G.7) for rules regarding the reinforcement

of multiple openings.

Also see

Welding Spacing in Pipe Spool

Distance between butt weld

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