ASTM A53 vs API-5L

[reichertc]

I am trying to do some wall thickness calculations on existing pipe in a refinery. The old isometrics that I am working off of specify the pipe as "SCH20 BEVLED SMLS/EFW PIPE CS ASTM-A53,OR,API-5LGRB". ASTM A53-B can be either electric resistance weld (ERW) or seamless. The EFW (electric fusion weld) in the description is confusing me. Is API-5L piping available as EFW? (I don't have ready access to the API standards.) I am specifically trying to find out what kind a joint factor I can use in my calculations. For what it's worth, the drawings are from 1976, and I don't have access to the API or ASTM standards of that era. Anyone have any suggestions?

 

[PAN]

I understand that the joint efficiency of API 5L for ERW is less than EFW. You may use the factor 0.85 in your calcualtion.

 

[imtiyaz]

Is there any code where i can get comparison between ERW & EFW?
Regards,
Imtiyaz Take care

 

[PAN]

The quality factors are shown in ASME B31.3 Appendix A.