Boiler Drain Line Diameter Problems

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SUMMARY

The discussion focuses on determining the appropriate diameter for drain lines in a power station, specifically under conditions of 217°C steam temperature and 31MPa pressure. The user seeks guidance on ASME or other code specifications that dictate how to calculate the drain line diameter based on the diameter of the pipe being drained. It is established that the drain line diameter should be influenced by the required drainage flow rate, exemplified by a scenario of needing to drain 1 liter per hour. Clarification is also sought regarding whether the steam is part of the pipe being drained or a separate system.

PREREQUISITES
  • Understanding of ASME code specifications for piping
  • Knowledge of fluid dynamics and flow rate calculations
  • Familiarity with high-pressure steam systems
  • Experience with pipe sizing methodologies
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  • Research ASME B31.1 for power piping standards
  • Study fluid dynamics principles related to drainage flow rates
  • Learn about high-temperature and high-pressure piping materials
  • Investigate pipe sizing calculators and software tools
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Engineers, piping designers, and maintenance personnel involved in power station operations and upgrades, particularly those focusing on steam systems and drainage solutions.

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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