Pipe wall

Can we use schedules specified in B36.19 (Suffix S) with Carbon steel pipes?

Jop, why mix things?. It is wrong to use an S in a carbon steel sch, but... up to NPS8 is the same 40 and 40S, the same for 80 and 80S. Then you have to check in some chart.

But we use non S schedules as per B16.10 for SS pipes. Why cant we use B36.19 S schedules for CS?

But we use non S schedules as per B16.10 for SS pipes. Why cant we use B36.19 S schedules for CS?

If you could find such pipes on the market then of course, you can use them. The other option is to get them made to order.

Good luck,

B16.10 is a valve specification, nothing to do here. On the other hand there is a lot of things that are not well defined in "the market". If you want to see which is the correct way to order some product, you have to look in each specification, for example in A 312 (SS pipe) qty / name / process / grade / size, etc. That specification refers you to ASME B36.19 for pipe sch.

Check in ASME B36.10 which is the STANDARD FOR PRODUCT SIZES in SS pipe, near the end of the specification.