Boiler Drain Line Diameter Problems

[towz]

Hi there,

I am currently doing an upgrade of the drain lines at a power station, the steam temperature (in the section where the drain line is to be installed) is 217*C and it's pressure is 31MPa, I am looking for an ASME or any other code specification that explains how to determine the drain line pipe diameter, relative to the pipe being drained's diameter?

Any assistance would be very much appreciated!

 

[JaredJames]

I would expect drain line pipe diameter to be determined by the drainage flow rate required.

If you have a litre of liquid build up over an hour, you need a pipe diameter that would give a drainage rate of 1l/h.

Is the steam in the pipe being drained or is it a separate entity?