PCV on Diaphragm pumps
PCV on Diaphragm pumps
(OP)
Folks;
our current design on site we have a chemical injection pump operating at high pressure.
we are intend to add a second train operating at low pressure, same pumps will be used.
on this low P, a PVC (with PIT) is being presented in the design, OPs team has challenged the design , under the pretext LP and HP will not work simultaneously.
any thoughts?
cheers
our current design on site we have a chemical injection pump operating at high pressure.
we are intend to add a second train operating at low pressure, same pumps will be used.
on this low P, a PVC (with PIT) is being presented in the design, OPs team has challenged the design , under the pretext LP and HP will not work simultaneously.
any thoughts?
cheers
RE: PCV on Diaphragm pumps
So long as the pump can supply both trains, the PCV letting down pressure is ok so long as you have suitable precautions to prevent over pressure of the LP system.
This needs to be looked at in a HAZOP or MOC procedure.
Your issue is flow capacity as a diaphragm pump is a PD unit so only supplies a given amount. How are you increasing flow?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: PCV on Diaphragm pumps
RE: PCV on Diaphragm pumps
Air powered diaphragm pumps are not purely "PD" pumps that output the same flow at whatever pressure. As you increase pressure and/or fluid viscosity, the pump will physically slow down the pumping cycles, lowering flow rate.
RE: PCV on Diaphragm pumps
RE: PCV on Diaphragm pumps
PVC ,PIT ?? Are you familiar with the terminology used for PID and instrument?
Please explain what you are talking about and supply a sketch/PID for us to understand your post.
Note: Not a good idea to install valve(s) at the discharge of PD pump (safety and environment concern).
Cheers,
Pierre
RE: PCV on Diaphragm pumps
MJCronin
Sr. Process Engineer
RE: PCV on Diaphragm pumps
And that the LP connection is essentially a tap from an open ended HP feed.
But no diagram or response from the IP we're all at sea...
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.