P-22 steel could be safely weld repaired multiple times. However every repair needs to be controlled with respect to welding heat input. Uncontrolled repair could impair notch toughness and UTS.
With respect to your query, could you specify the following:-
- What's the design code, temperature?
- Any notch toughness requirements?
- Any hardness requirements
- Is there any result of simulated heat treatment for the piping done at the mill.
If the last result is available(I.e the simulated HT), you may perform multiple(but controlled) weld repairs. However the T&T of multiple PWHT should not exceed the range of simulated HT.
Let me know if it helps. The attached article though is for general guidance but provides a good oversight of the PWHT issues.
Thanks.
Pradip Goswami, P.Eng,IWE
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of veera raghava kommisetti
Sent: Friday, May 24, 2013 4:17 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:17784] Repeated heat treatment
As such there is code resitriction. But it is repatative, it is suggest to do a simulated PQR with number of cycle and check properties.
On Fri, May 24, 2013 at 6:35 AM, M S R K S Prasad <MSRKSPrasad@nagarjunagroup.com> wrote:
Dear Members,
Kindly inform me how many times a in service P-22 piping can be weld repaired and re heat treated.
regards
M.S.R.K.Srinivasa Prasad
A.G.M ( Mech. Maint Plant-1,OS&PP)
Nagarjuna Fertilizers And Chemicals Ltd
Nagarjuna Road
KAKINADA-533003
Ph: 0884-2360212(O),9676931414
2379302(R) --
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