Goulds Pumps XHD - IOM - Manual (Page 59)

Commissioning, Startup, Operation, and Shutdown
Do not overtighten gland nuts. Overtightened packing causes excessive friction between
packing and sleeve and will result in damaged components.
Table 8: Flush water requirements
The flush water requirements are listed for both the weep style and full flush packing arrangements.
Group Size (L5) Full Flush Full Flush (1L4) (2L3) Weep Mechanical
GPM (liters/ GPM (litres/ Flush GPM Seal Flush
min) min) (liters/min)
PF2 XHD80 15 (57) 10 (38) 0.3 (1.1) Consult Seal
Mfg
PF3 XHD125 23 (87) 18 (68) 0.6 (2.3)
PF4 XHD150,200 37 (140) 32 (121) 1.1 (4.2)
PF5 XHD250,300 61 (231) 56 (212) 2.2 (8.3)
Pump priming
WARNING:
These pumps are not self priming and must be fully primed at all times during operation. Loss of prime
can lead to excessive heat and severe damage to the pump and seal.
Prime the pump with the suction supply above the pump
1. Slowly open the suction isolation valve.
2. Open the air vents on the suction and discharge piping until the pumped fluid flows out.
3. Close the air vents.
1. Discharge isolation valve
2. Check valve
3. Suction isolation valve
Prime the pump with the suction supply below the pump
Use a foot valve and an outside source of liquid in order to prime the pump. The liquid can
come from one of these sources:
• A priming pump
• A pressurized discharge line
• Another outside supply
1. Close the discharge isolation valve.
2. Open the air vent valves in the casing.
3. Open the valve in the outside supply line until only liquid escapes from the vent valves.
4. Close the vent valves.
5. Close the outside supply line.
This illustration is an example of priming the pump with a foot valve and an outside supply:
XHD Installation, Operation, and Maintenance Manual 57