Dear All Large dia Welded pipes

[sree61]

Dear All

Large dia Welded pipes supplied to A 928 Class 1 .These pipes are rolled from astm a 240 with plate thickness
at near to 87.5% of specified nominal thickness of Pipes.Is this acceptable practice as the wall thickness of finished pipes will be uniformally
less in thickness but within minus 12.5% tolerance
Thanks in advance
Sri

 

[metengr]

Another way to look at this is when you order pipe it should be at nominal thickness where min wall required by Code + 12.5% = nominal thickness.

 

[DVWE]

Yes, this is quite common practice in the industry due to the cost of stainless steel.

 

[EdStainless]

If you are buying a large quantity, and working directly with the mill, it is worth asking to see their procurement spec and see what minimum thickness they are requiring. I have seen mill cut it too close and end up with spots that are under wall, and then hope that the user is desperate enough to take it.
Even in the tubing business where we work +/-10% we order strip at -6% of nominal. This is standard practice.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[BUGGAR]

And then along comes ASTM A1085 which specifies full wall again.

 

[EdStainless]

Buggar, that is called min wall product, and in that case they had better order strip that has a min thickness a few percent above the ordered wall. It is all in the details.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube