HVAC Pipes flushing
HVAC Pipes flushing
(OP)
Dear Experts,
After the chilled water pipes are commissioned, what is the water flushing procedure to be followed.
How many times the flushing is to be done for the pipes. What are the chemicals to be used in this cleaning process.
Highly appreciate if any standards or procedure can be shared.
Thanks,
Manu





RE: HVAC Pipes flushing
RE: HVAC Pipes flushing
RE: HVAC Pipes flushing
But as part of the Cx process I’d expect to see that pipes have been thoroughly flushed after filling, chemicals (either acid or caustic) have been applied for 2-3 days to develop a passive oxide layer in the piping, pipes have been thoroughly flushed again, then pump start-up strainers have been removed and all system y-strainers have been flushed.
The final piece of the verification process would be that the right concentration of chemicals had been added, expansion tanks are correctly charged and online, make-up water is aligned to the system and that glycol mix tanks work and have the right pressure switch settings.
RE: HVAC Pipes flushing
i consider flushing a mechanical cleaning. chemical treatment is separate process. in flushing, you use mechanically filtered water to remove whatever you can from interior of piping.
flushing can last for long depending on system layout. if you have one-circle system, sludge from bottom of boiler can reach the most distant radiator and rest there. so you have to open flushing valves on all branch ends, and flushing is complete only when there is clear water at all flushing points.
RE: HVAC Pipes flushing
I think you mean desinfection, followed by flushing.