I am designing for a vacuum relief pipe for a drainage inlet wet well. A couple of 48" dia pipes from a reservoir drain into the wet well, which in turn is piped via a 72" dia pipe to a pump station. The design flow of the pump station is 160 MGD. The vacuum relief design is in anticipation of...
I am designing for a vacuum relief pipe for a drainage inlet wet well. A couple of 48" dia pipes from a reservoir drain into the wet well, which in turn is piped via a 72" dia pipe to a pump station. The design flow of the pump station is 160 MGD. The vacuum relief design is in anticipation of...
Great thanks! By the way if I use the Q=Cv*dp^0.5 equation with the Q at 188 cfs (or 84,380 gpm), and a valve Cv of 2.0 (from the mfg catalog at full open position) I end up with a dp of 1.78 x 10^9 psi. This doesn't make sense, I need a huge Cv just to get in the range of a 49 to 58 psi drop.
Thanks BigInch. You calculate the maximum pressure drop across the valve as 49 psi using NPSHR. Is another way possible to calculate maximum pressure drop across the valve by using velocity pressure and the head loss coefficient K value [K(v^2/2g)] at a valve minimum (cracked) open position? 15...
I am selecting a butterfly valve to be installed on a submerged pipe intake at the bottom of a reservoir, and need to determine the upstream and downstream pressures of the valve so the actuator torque can be determined. The valve is a shutoff valve for the pipe, that when opened allows water to...
I am selecting a butterfly valve to be installed on a submerged pipe intake at the bottom of a reservoir, and need to determine the upstream and downstream pressures of the valve so the actuator torque can be determined. The valve is a shutoff valve for the pipe, that when opened allows water to...
