Weld repair to pitting on API 5L X65 pipe flange
Weld repair to pitting on API 5L X65 pipe flange
(OP)
I have some weld repairs to make to an api 5l x65 pipe flange face, the flange faces is pitted.
Was thinking of using a 7018 rod to do weld metal buildup and then machine the flange face.
Are there any specific heat treatment requirements or pre-heat / interpass temp requirements ?
Was thinking of using a 7018 rod to do weld metal buildup and then machine the flange face.
Are there any specific heat treatment requirements or pre-heat / interpass temp requirements ?
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RE: Weld repair to pitting on API 5L X65 pipe flange
In your description this is not an acceptable weld repair, but should be considered a weld overlay to recharge the thickness of the flange face.
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RE: Weld repair to pitting on API 5L X65 pipe flange
Steve Jones
Corrosion Management Consultant
www.linkedin.com/in/drstevejones
All answers are personal opinions only and are in no way connected with any employer.
RE: Weld repair to pitting on API 5L X65 pipe flange
API 5L is a reference for the technical specification of pipe in petroleum and natural gas transportation and has nothing to do with the flange.
at the first you shall refer to project/client specification, by reason of that flange body and face repair is not allowed in some of specification.
if there is not any project/client specification, manufacturing standard shall be consider such as ASTM A105,ASTM A694,ASTM A691,MSS-SP75,etc. (refer to flange certificate).
Repair length/thickness restriction stated in the code/std.
If repair allowed by client/code/std. low hydrogen electrode such as 7018 or GTAW rod such as 70S-X shall be used. pre heat is very important, for low alloy CS flange (50~100 oC) is Ok depend on the dimension of flange due to weld rapid cooling may be happened by reason of material heat sink.
Finally, you shall consider all welding technical details in usual repair/buildup WPS.
RE: Weld repair to pitting on API 5L X65 pipe flange
The flange is likely to be ASTM A694 F65 to MSS Sp-44.
This sounds like a wholly bad idea to me - flanges are not really designed to be weld "repaired" like this.
Is this an old flange someone has found knocking around and wants to use it? how otherwise did the flange face get pitted?
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