hi, we have received a new boiler mud drum which has an additional longitudinal weld in the plates and has following concerns: 1. This weld is within 150 mm from the existing weld (center to center) , does code specify min distance between welds. there is still some gap between the HAZ of these two weld. 2. The weld configuration is single V, is this acceptable as the wall thickness is 65 mm, the other weld is double V config. The boiler mud drum has 2.5 M ID and made in CS, please advise. regards

Thanks Mr Srinivas, the "concealed" weld was detected during baseline inspection after it was delivered from china, where it was built. The weld was ground flush and had no records in the MDR. The conceal weld was heat treated though but has defects as seen through TofT. Prior to attemting any repairs, we are assessing if this is acceptable to have two welds close to each other. Its built to american std but code doesnt specify exact allowable distance between welds. >Bigpond > >Is Boiler drum made to USA boiler code? Then you have to >apply U.S.A - American Boiler code regulations to permit >additional weld within 150 mm distance and for minimum >distance permitted to meet American Boiler Code between to >two longitudinal welds. > >The fact that an additional longitudinal weld is given shows >the boiler drum manufacturer wanted to utilize the plate >available and form the same plate available to get an >additional longitudinal weld at a distance of 150 mm from >the longest formed weld. > >Probably he had cuts corners to make an additional >longitudinal weld within 150 mm. How did he get the earlier >(original) approval for all these from authorities - both >Boiler and Third Party Inspection authorities for such a >practice. > >Normally for 65 mm thick plate, a double "V" should be >insisted and followed. How the manufacturer who got the >approval from US boiler code authorities for the fabrication >drawings and from third party inspector who inspected during >fabrication such approvals to make with a single "V". How he >got WPS / PQR done for such thick 65 mm plate with single >"V" preparation? >Hope this helps >C.V.Srinivasan >Nishi Engineers Pvt Ltd India August 4, 2009 >E-mail: nishi@vsnl.com > > >>hi, we have received a new boiler mud drum which has an >>additional longitudinal weld in the plates and has >>following concerns: >>1. This weld is within 150 mm from the existing weld (center >>to center) , does code specify min distance between welds. >>there is still some gap between the HAZ of these two weld. >>2. The weld configuration is single V, is this acceptable as >>the wall thickness is 65 mm, the other weld is double V >>config. >>The boiler mud drum has 2.5 M ID and made in CS, please >>advise. >>regards regards