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Earl   AST Forum  

API 650

Saturday, August 12, 2017   By: Tankee [235] 4 Stars
I have always considered the multipass phrase in API 650 to mean multiple passes that are visible after welding is completed. I have a tank foreman arguing that multipass can mean 1 bead over another and only one showing. My reasoning is that an inspector cannot watch every inch of welding being performed on a tank bottom, so the end result needs to be a minimum of two beads being visible. Also, if documentation is lost, or not available, to inspection years later and they see only one bead, they are going to assume that it is not multipass. I appreciate any comments or clarifications on my way of thinking.

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Sunday, August 13, 2017   By: Javed Nasir [1566] 1 Stars
As per ASME Section IX Edition 2015, following are the important definitions to make an argument of API 650 multi pass phrase:
These definitions are contained under QG-109

Pass: a single progression of a welding or surfacing opera-
tion along a joint, weld deposit, or substrate. The result of
a pass is a weld bead or layer.

Cover Pass: a final or cap passes on the face of a weld.

Wash Pass: pass to correct minor surface aberrations
and/or prepare the surface for nondestructive testing.

Weld Bead: a weld deposit resulting from a pass

Layer: a stratum of weld metal consisting of one or more

Your fabricator is correct in case where one pass results one bead and one layer. He will apply two passes, and results will be two layers . Say, the weld is completed in two passes/two layers, It will be a multi pass weld.From the top, you cannot make a judgement if the weld is multi pass or single pass. Only through cross section, you can verify.

If bevel is wide enough or weld is long enough and welding process is manual, visually you can see multi passes in this case.

Best Regards
Javed Nasir

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Monday, August 14, 2017   By: ITS [1678] 4 Stars
I dont know about watching the laying down of every weld bead pass, but the ASME Section XI seem clear and has historical been clear that the WPS or weld procedure specification requires a cross section of the joint that depicts the sequence of the weld beads. Although this is a non-essential variable it is still required. After all the WPS is a welders instruction that was based on the weld coupon qualification. Now, a non-essential variable doesnt require re-qualification of the weld coupon.

So, the WPS should never be ignored for the weld engineer had purposely made out the PQR to ensure the weld coupon was strong and practical for the application and spun off multiple Weld Procedures Specifications WPS.

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Published on ast-forum.com


Atmospheric Design Pressure
By: Fathi [46]

The whole story is to avoid brittle fracture=

Test temperature shall be equal or warmer than Minimum Metal Design temperature at Test pressure.

I would limit my minimum testing temperature for a tank (or even for a vessel or a piping system) by the =

Temp = maximum of [ Min(lower shell) , Min(shell# 2) ....Min (Upper shell) ]

For a Shell# i the minimum is function ( of shell tickness , Material group ) and this can be found in API 650 , Fig 2-1

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