Attachment welds for lethal service vessel
Attachment welds for lethal service vessel
(OP)
Dear all,
Can fillet weld without full penetration for internal and external attachments (such as tray support rings, platform support clips) be used for lethal service vessel ?
Can fillet weld without full penetration for internal and external attachments (such as tray support rings, platform support clips) be used for lethal service vessel ?





RE: Attachment welds for lethal service vessel
Why do you think an appropriately designed fillet weld using an appropriate filler material and PWHT as required could not be used?
Existing tank and new weld for new attachment?
Existing tank, new weld to repair a failed attachment?
New design tank with new fillet weld?
RE: Attachment welds for lethal service vessel
RE: Attachment welds for lethal service vessel
I am seeking the opinion if lethal service shall be doing the same to avoid traping the lethal content in crevice that may be inhaled during maintenance or repair in the future. I do see a thread saying using integrally reinforced nozzle for lethal service, and for sure nozzle has to be full penetration weld. By the same token, shall at least all internal attachment welds be full penetration ?
Whoever who has experience in design and purchase lethal service in the past, please advise.
RE: Attachment welds for lethal service vessel
With lethal service all welds that connect internal plates to the clad/w.o. shall be full penetration. This is mandatory.
Personally, I would suggest to perform always full penetration welds on all attachments (internal or externals) to the pressure vessel body.
RE: Attachment welds for lethal service vessel
This is not neccessary to be a cladded vessel for lethal service. Is your point still valid for using full penetration weld for CS parts to CS vessel ? Where can I find a document saying full penetration shall be used ? Thanks.
RE: Attachment welds for lethal service vessel
RE: Attachment welds for lethal service vessel
For a carbon steel vessel on lethal service have firstly a look a the code, and then check the client specifications.
If no restriction are present go further with the weld you desire.
As I remember ASME doesn't have rules for welds on structural attachments.
greetings