Factors influencing weld toe to toe distance requirements

[ricellis]

We would like to cut out a 16mm butt weld on an existing precipitation tank shell, and place a new weld only approximately 100mm from where the old weld was. This is far less than that specified in API 650 (250mm). We can test a sample of the weld and plate around the HAZ; do we need to look for metallography changes only, or are there other factors that influence weld toe to toe distances?

 

[ricellis]

The tank was designed to API 650 and ASME section 8, it is grade 250 steel and the tank is 30 years old.

Thanks in advance for replies