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Hi Group,
I am trying to deal with an issue of controlling the pressure of Gland seal water flow to slurry pumps. I need to maintain the pressure atleast 70 kpa above the discharge pressure of a pump.
I have Ez micro form 1" control valves for each of 2" GSW lines feeding gland water to their respective pumps (lets say A & B) upstream pressure is 2000 kpag. for pump A the required pressure is 1000 kpag and for pump B its 700 kpag.
Now, I am bit confused to see that both of my valves are 100 percent open after being in service for two years and with same upstream pressure they are some how maintaining their respective downstream pressures. Is it possible,?? for absolutely same valves at 100 percent, with same upstream pressures to produce a different downstream pressure?
I was thinking first its maybe a faulty transmitter, however when I tried commanding the valves to close in steps the pressure and flow fluctuates as well. What am I missing here?
Any leakage in system will impact the flow I understand but not pressure is that right? As on the same line upstream
if a control valve there is a 3/4" seal flush lines to the pressure transmitter, and I was doubting if they might be leaking or "on" for a longer duration, thus impacting flow and pressure?
I am trying to deal with an issue of controlling the pressure of Gland seal water flow to slurry pumps. I need to maintain the pressure atleast 70 kpa above the discharge pressure of a pump.
I have Ez micro form 1" control valves for each of 2" GSW lines feeding gland water to their respective pumps (lets say A & B) upstream pressure is 2000 kpag. for pump A the required pressure is 1000 kpag and for pump B its 700 kpag.
Now, I am bit confused to see that both of my valves are 100 percent open after being in service for two years and with same upstream pressure they are some how maintaining their respective downstream pressures. Is it possible,?? for absolutely same valves at 100 percent, with same upstream pressures to produce a different downstream pressure?
I was thinking first its maybe a faulty transmitter, however when I tried commanding the valves to close in steps the pressure and flow fluctuates as well. What am I missing here?
Any leakage in system will impact the flow I understand but not pressure is that right? As on the same line upstream
if a control valve there is a 3/4" seal flush lines to the pressure transmitter, and I was doubting if they might be leaking or "on" for a longer duration, thus impacting flow and pressure?
