Size selected should result in frictional line loss of 5 psi/100 ft (1.1 kPa/M) or less for suction lines and 10 psi/100 ft (2.3 kPa/M) or less for discharge lines. A larger pipe size will reduce the frictional line loss.
WARNING: THE PUMP MUST NOT RUN WITH A CLOSED DISCHARGE OR IRREVERSIBLE DAMAGE TO THE WETTED INTERNAL PARTS OF THE PUMP WILL RESULT!
3.3.3Pump Piping Connections
The standard inlet and discharge connections for a Series 500 pump is a 3/4-inch NPT female pipe thread, and for Series 1000 and 1800 pumps is 1-1/4-inch Victaulic couplings/clamped unions with gasket. Victaulic cou- plings are available worldwide. Contact the factory or your local industrial piping wholesaler.
3.3.4Inlet Line Screen/Filter
This is a precision multi-stage pump with close tolerances to provide maxi- mum efficiency. It is good practice to install a large area 30-mesh or finer screen, or a cartridge filter in the pump inlet line to collect any foreign objects or large particles. Size the screen or filter so as to induce a minimal pressure drop.
WARNING: THE PUMP MUST NOT BE OPERATED WITH RESTRICTED SUC- TION LINE (INLET) FLOW.
Positive gauge pressure must be maintained at the pump inlet (downstream from the screen or filter). A clogged screen or filter will result in a greater pressure drop than a clean screen or filter. To prevent possible pump dam- age from low inlet pressure, a low-pressure alarm or shut-off switch should be located between the screen or filter and the pump. A low-flow shut-off switch should also be located in the same area.
3.3.5Discharge Screen (Strainer)
A 30-mesh screen (available as an accessory for 500, 1000 and 1800 Series pumps) located in the discharge piping will protect your process fluid should the pump be damaged. The installation of the screen is shown in Figure 3.2 (Installation of Discharge Screen).
