Figure 14:
2.
By Separate Hand or Manually Controlled Priming Pump (See
).
Figure 15:
Close discharge gate valve (keep air vent valves closed) and open valve in line to priming pump.
Exhaust air from pump and suction piping until water flows from priming pump. Close valve in
priming line, start pump and open discharge gate valve. Or, by reversing connections on priming
pump and extending priming pump suction to source of liquid supply, centrifugal pump may be
primed by pumping liquid into casing until liquid comes out of the open air vent valves. As in Sec-
tion
A2 (a). In either of these methods (a) and (b), the pump will remain
primed, provided foot valve is tight. Any failure, however, of foot valve when pump is standing
idle, will permit the pump to lose its prime. During long idle periods, the pump can also lose its
prime through leakage from stuffing boxes.
3.
Bypassing Around Discharge Check Valve (See
4.1 Priming
28
3405-3406-3416 Installation, Operation and Maintenance Instructions
