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Re: [MW:34359] Crack Repair

By Materials & Welding
Unfortunately i cant share the sketch. Base material is SA 516-GR 70 and clad material is SS 347.And the service is NG saturator.
On Tuesday, 20 June 2023 at 11:56:31 UTC+3 Ahmed Eissa wrote:
Dear Sir, 

Please provide sketch of Crack location and Materials grade and service of the HE. 
Thickness and if any of API 934 series apply 

Thanks 
On Tue, Jun 20, 2023 at 10:48 AM, Ashish Chacko

Request for Expert Advice on Crack Repair

I am writing to request the support of the experts out here on a crack repair in an exchanger. The exchanger has a fillet weld with the shell, and a crack was found during the last TAM. There is a possibility that the crack will be found again during this TAM.

The base material of the exchanger is 58mm P1 (A516-GR 70) with cladding of SS347 of 6mm. There are two scenarios to consider:

  • Scenario 1: Localize repair of the ring chamber fillet weld by grinding and welding. The client is requesting for annealing after the repair. Is this really required?
  • Scenario 2: If the crack propagates to the shell, the client is asking for DHT and PWHT. When should DHT be performed, before or after the cladding weld? Is there any exemption for PWHT?

I would be grateful for any advice that you can provide on these two scenarios. Thank you for your time and consideration.

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