A105 Lap joint flange limitations
A105 Lap joint flange limitations
(OP)
I have a question regarding the use of A105 / Aluminum Lap Joint flanges according to B31.3 in the following arrangement.
Design Temp: -320 deg F
Design Press: 100 PSIG
The actual 'stub end' of the connection is Aluminum (B247 6061-T6), the A105 portion is the backing flange that doesn't come in contact with the actual -320 process, it's only being used to mechanically connect the aluminum stub ends.
According to B31.3 where will I find this arrangement to be acceptable or unacceptable?
thanks in advance..
Design Temp: -320 deg F
Design Press: 100 PSIG
The actual 'stub end' of the connection is Aluminum (B247 6061-T6), the A105 portion is the backing flange that doesn't come in contact with the actual -320 process, it's only being used to mechanically connect the aluminum stub ends.
According to B31.3 where will I find this arrangement to be acceptable or unacceptable?
thanks in advance..





RE: A105 Lap joint flange limitations
RE: A105 Lap joint flange limitations
RE: A105 Lap joint flange limitations
RE: A105 Lap joint flange limitations
Furthermore, if the backing flange really gets around the design temp of -320 F, you'll know for sure A105 wont hold it.
RE: A105 Lap joint flange limitations
Yet, as everyone else has observed, that's not going to work in this case unless the OP has discovered some heretofore unknown perfect insulator to slip between the stub and flange.
It's probably worth seeing the cost difference between and aluminum/ss lap joint combo vs. a full aluminum weld neck.
Edward L. Klein
Pipe Stress Engineer
Houston, Texas
"All the world is a Spring"
All opinions expressed here are my own and not my company's.