Parabolic Trough Piping ASME B31.1 vs B31.3

I think it depends on the design life....20 years or 40 years....

http://www.pipingstudy.com/difference-asme-b311-and-b313.html

This sounds more like power piping than process piping, suggesting B31.1 as the better choice. Your conditions imply superheated steam. 300°C = 572°F, so you might want to double-check those conditions.

The saturation pressure for H₂O at 300degC is nearly 86barg, so the conditions indicated suggest superheated steam..

So use the right code, and to hell with the budget.

You all are right...sorry, my mistake. 7 bar is the head of the FW pump. Real pressure for the design point is 16,8 bara (236,8 psia)...at the outlet of the camp where the temperature is...199 ºC (200ºF) close to saturation point (what a mess!), so the water never boils.

I beg your pardon and re-ask the question :-)

Thanks

199°C ≈ 390°F.

Thanks

...here I go again

You all are right...sorry, my mistake. 7 bar is the head of the FW pump. Real pressure for the design point is 16,8 bara (236,8 psia)...at the outlet of the camp where the temperature is...199 ºC (390ºF) close to saturation point (what a mess!), so the water never boils.

I beg your pardon and re-ask the question :-)

Thanks

This heated water then goes through a steam generator (heat exchanger) and then is returned (via pump) maybe through a cooler, and is again and is again ran through the heater (parabolic trough) heated and the cycle repeats over and over and over.

It is B31.1. Period.

Where do you think you would save money? You must have an inspector that will approve or disapprove. Rework is always more expensive than doing it right the first time.

Second guessing code will bite you in the ass most times.