## Per B16.5, are 2-1/2" and smaller 900 & 1500# flanges equivalent?

## Per B16.5, are 2-1/2" and smaller 900 & 1500# flanges equivalent?

(OP)

Per B16.5, 2-1/2" and smaller 900 & 1500# flanges are dimensionally equivalent. Assuming that the same material spec is used for both of them, a calculation would result in the same pressure retaining capability.

Would a 2" 900# flange stamped ASME B16.5 still be limited to the pressure rating listed in the applicable table? It seems like a silly question to me, but I don't see clarification on this issue in B16.5.

One of our project managers had a thermowell manufactured using a 2" 900# flange when a 1500# flange was specified, and now we need to justify it to the customer. Running Appendix 2 calcs may result in a greater thickness than what B16.5 requires, so that's not my best option.

Would a 2" 900# flange stamped ASME B16.5 still be limited to the pressure rating listed in the applicable table? It seems like a silly question to me, but I don't see clarification on this issue in B16.5.

One of our project managers had a thermowell manufactured using a 2" 900# flange when a 1500# flange was specified, and now we need to justify it to the customer. Running Appendix 2 calcs may result in a greater thickness than what B16.5 requires, so that's not my best option.

## RE: Per B16.5, are 2-1/2" and smaller 900 & 1500# flanges equivalent?

Lesson in careful, detailed work for your PM.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

Afterthought: Maybe you should confirm the flange marking.

## RE: Per B16.5, are 2-1/2" and smaller 900 & 1500# flanges equivalent?

I am not sure what Annex B, B2 are. Another thread on this forum, stated that this is METHOD USED FOR ESTABLISHING PRESSURE–TEMPERATURE RATINGS, which is Annex B in B16.5-2003, but which is now NONMANDATORY APPENDIX A in the -2013 edition. Is that what you are referring to?

Yes, the PM, who is a pretty conscientious person, won't forget this lesson soon.

## RE: Per B16.5, are 2-1/2" and smaller 900 & 1500# flanges equivalent?

## RE: Per B16.5, are 2-1/2" and smaller 900 & 1500# flanges equivalent?

## RE: Per B16.5, are 2-1/2" and smaller 900 & 1500# flanges equivalent?

The problem with sloppy work is that the supply FAR EXCEEDS the demand

## RE: Per B16.5, are 2-1/2" and smaller 900 & 1500# flanges equivalent?

## RE: Per B16.5, are 2-1/2" and smaller 900 & 1500# flanges equivalent?

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

## RE: Per B16.5, are 2-1/2" and smaller 900 & 1500# flanges equivalent?

## RE: Per B16.5, are 2-1/2" and smaller 900 & 1500# flanges equivalent?