Hi,
Those who has access to EPRI, may refer this document for guidance.This document is based on practical experiences on various mock ups. This may work for socket welds or other low pressure lines and would require special peening techniques and special guns.
On a "pressure boundary" component like heater the answer is "NO for peening ", whether it's temporary or permanent. The issue is very simple, pinhole leak could be associated with many many critical failures if investigated properly. Failures could be fatal.
Weld repair by GTAW would be best advisable.
Thanks.
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Specialist
Ontario, Canada
pradip_goswami@yahoo.ca
On-Line Welding Repair for Leaking Pipe Components: Product ID:TR-108132
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ramin Kondori
Sent: Wednesday, June 25, 2014 5:01 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:21258] peening as a temporary repair
If it is temporary and stops the leak, why not...? go ahead
On Tue, Jun 24, 2014 at 3:34 PM, Adriaan Stoltz <riaan@ritc.co.za> wrote:
--Good day valued members.
Has any of you gentlemen had any experience in temporary repairs on carbon steel pressure vessel by means of mechanical peening? A steam leak was discovered on a Low pressure Heater (300Kpa) at a nozzle to vessel shell weld interface. It seems to be a pinhole through the weld. Is mechanical peening of the defect area considered to be an acceptable means of closing up the leak temporarily until a proper weld repair can be carried out? And if so, is this type of repair documented in any of the in service inspection and repair standards?
Your input is greatly appreciated.
Riaan Stoltz
RITC Inspection
083 6405909
021 556 4884
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