B31.3 Wall thinning

[anolan23]

Hi,

If I was to fabricate an extruded outlet header, there is going to be some wall thinning of the run pipe. Estimates I've seen are 7-15% of original thickness. Are these thinnings negligible when designing for run pipe internal pressure? THANKS.

 

[LittleInch]

You need to read and understand section 304.3.4 to see if reinforcement is required - 304.3.4 Reinforcement of extruded outlet headers seems to apply to me....

If you don't understand something in that section then come back with your query.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[anolan23]

Thanks, I am aware that this exists. For simplicity lets assume that reinforcement is adequate.

Back to wall thinning. Can the reduction of thickness from the extrusion process be assumed to be negligible when designing the run pipe for internal pressure? For example, if my design conditions warrant a 2" SCH10 pipe and I make an extruded outlet header on it, do I have to take the wall thinning into account. I'm thinking that as long as the nominal thickness is greater that the minimum required by formulas, then I'm good. What do you think?

If this is the case, I'll need to make some samples to determine, experimentally, the actual amount of thinning that occurs.