Boiler Drain Line Diameter Problems

AI Thread Summary
When upgrading drain lines at a power station, it's crucial to determine the appropriate pipe diameter based on the drainage flow rate required. For a steam temperature of 217°C and pressure of 31MPa, adherence to ASME or relevant code specifications is essential for safety and efficiency. The diameter should accommodate the expected drainage, for example, a pipe must handle a rate of 1 liter per hour if that is the anticipated buildup. Clarification is needed on whether the steam is part of the drainage system or separate, as this impacts the design considerations. Proper sizing of the drain line is vital to ensure effective operation and compliance with industry standards.
towz
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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!
 
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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?
 

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