B31 Coefficient y for Pipe Thickness Calculation
B31 Coefficient y for Pipe Thickness Calculation
(OP)
Hi, B31.1 was changed in the 2005 version to show coefficient y=0 for cast iron and non-ferrous materials. The previous version had y=0.4.
Will B31.3 have a similar change?
B31.3 shows only cast iron having y=0. I assume the non-ferrous materials fall in the "other ductile metals" category.
Will B31.3 have a similar change?
B31.3 shows only cast iron having y=0. I assume the non-ferrous materials fall in the "other ductile metals" category.





RE: B31 Coefficient y for Pipe Thickness Calculation
Anyone, please with an answer!
RE: B31 Coefficient y for Pipe Thickness Calculation
RE: B31 Coefficient y for Pipe Thickness Calculation
when y = 0.0, tm = 0.1376
when y = 0.4, tm = 0.1343
So, I see there is little difference, and y = 0 is more conservative. Non-ferrous metals (aluminum, nickel alloys, copper, and titanium) have y = 0 in B31.1 and y = 0.4 in B31.3.
Thanks,
Ben Nottingham