Compressor tank - drainage considerations

[STSI]

Hi guys - first time poster - so take it easy on me!

Are there any specific guidelines or standards that should be followed when designing the drainage system for a compressed air tank?

Logically, the drain system should be designed in such a way to withstanded the nominal working pressure of the vessel in the event of a drain blockage.

While that premise is logical, where might I find published information that might provide additiaonl guidance, specifically on the drainage requirements for a compressed air tank.

for info:
tank capacity: 5.5 m^3
storage medium: compressed air
nominal storage pressure: 30 bar

Any assistance is greatfully appreciated.

Thanks.

STSI.

 

[MJCronin]

The drainage required for a compressed air tank will depend on the capacity of the compressor feeding the tank. The tank functions as part of an integrated system...... so you must know more about the system operates.

Either a manual or automated drain valve is typically used on such a tank. Automated valves typically are actuated base on timers. Selecting the valve (and nozzle size) is more dependent on the rate of condensate generated rather that the size of the tank.

http://www.ingersollrandproducts.co...condensate-management/electronic-drain-valves

Tell us more about your location and what is upstream of the tank......

 

[racookpe1978]

The water coming out of the tank - and there can be several pints every day, but it will depend on temperature and humidity of the air going into the compressor - will be rusty and dirty. Run your drain line through an automatic valve to a sewer or dirty water receptacle. DON'T let it just blow out onto the floor or pavement.

Above all, use an automatic valve - DON'T trust your operators to keep blowing down the tank regularly!

 

[STSI]

Thanks for the info fellas. Though not quite what I have was after. We are dealing with a compressor discharge pot that became over pressurised when the main pressure tank was drained of condensate. As the fluid drained from the compressor tank to the drainage pot and then from the pot to atmosphere, there was a blockage - which has led to an overpressurisation. In this installation the pot could be considered a 'closed system'.

I am after any guidlines (ASME pressure vessel codes or other.....) that discusses any considerations or criteria for the design of a drainage system.

Any assistance is appreciated.

 

[racookpe1978]

Sure: Same thing would happen if your automatic drain valve couldn't operate because the water in the drain valve/drain piping/bottom of tank froze up.

You have to design the SYSTEM - from outlet of the compressor through its piping and check valve out to the tank to its isolation valve and relief valve through the drain valve to that final opening as a pressure system. The tank has "rules" and the relief valve has rules and the piping has rules intended to protect the nearby people from overpressure.