Joining/welding grade X65 with X60?

[Rouji]

Greetings,

We have welded X60 crude oil pipeline, and we want to replace a small portion of the pipeline, can we use X65 as replacement?.

Because we have stock of X65.

Thanks.

[Ilkin hasanov]

High grade can cover below grade 

Not vice versa 

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[Perumal Govindan]

Please get design/piping engineering concurrence and get it approval by the client before fitment.

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[Vinay Thattey]

The  API 5L pipeline is commonly used for crude oil application.

ASTM-A-106B is very close to that  .  

X indicates minimum yield strength . 

API 5L X65 pipe   is a high level grade pipe in API 5L  with minimum yield strength required in 65000 Ksi or 450 Mpa. 

You can replace but take a view of your designer .

Regards

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[MADHUSOODHANAN NAIR .G]

Dear All

    Certainly you can weld the  different grade pipes use E6010 for root pass and E7010/E7018-1 for other passes.If the requirement of impact test better to use E7018-1.  

Madhusoodanan Nair.G

 Mob- 7977762694,9967901872