By G.S.Crisi
Date 07-22-2013 18:05
Edited 07-22-2013 18:12
That's the million dollar question. No standard specifies the minimum distance between welds in piping.
What there are, are figures pulled off the air with no technical support (we always did like this and never had any problem, so we'll keep on doing it), or in the best case, figures stated on Piping Standards issued by Engineering Companies, that usually read like this: "Minimum distance between two welds will be X pipe diameters, if at all possible". This means that if it's not possible, the distance may be shorter.
Giovanni S. Crisi
Sao Paulo - Brazil