90° 5D stainless steel Bend

[H_Haroun]

Hello guys! My client requested an elbow LR 5D 90° DEG 6" SCH120 ép:14,27mm ASTM A815 UNS S31803 according to ASME B16.9; but the standard ASME B16.9 doesn't include a 5D elbow, the maximum centerline is 3D, so I told him maybe you want a 5D bend, if so it should be manufactured according to ASME B16.49 for induction bend, and the material would be ASTM A790 UNS S31803 instead of ASTM A815 UNS S31803, because the induction bend is produced from a pipe, but I noticed that ASME B16.49 is for carbon steel only, it doesn't cover the stainless steel.

 

[Doug Hunter]

Did you have a specific question?

 

[LittleInch]

Did he.mean a 1.5D elbow to B 16.9??

5D is a bend.

Client sounds confused....

 

[H_Haroun]

Did you have a specific question

The question is: if it's a bend, which standard is applicable? because ASME B16.49 is for carbon steel only, and the requested material is duplex SS.

 

[LittleInch]

Everyone just uses B16.49 or ISO 15590 and adapts the mechanical data.

You need a test bend and then test it as described.

 

[H_Haroun]

Everyone just uses B16.49 or ISO 15590 and adapts the mechanical data.

You need a test bend and then test it as described.

Thanks for the information! Yes, it's the best solution, I think the material should be A790 S31803 as the bend should be produced from a mother pipe. In this case, a hydrostatic test is required for each bend instead of design proof test.

 

[johnnymeng2025]

S31803 is not explicitly listed in ASME B16.49, but the standard allows materials that comply with applicable codes