Commissioning, Startup, Operation, and Shutdown
1. Priming pump
2. Shutoff valve
3. Vent plug
4. Discharge gate valve
5. Foot valve
Figure 21: Separate hand, or manually controlled, priming pump
Prime the pump by bypassing the discharge check valve
This method can be used only when there is liquid under some pressure in the discharge line.
The original prime must be induced from an outside source. This system is used for automatic
operation where idle periods are short and there is no danger of exhausting all liquid from the
discharge line due to a leaky foot valve. The foot valve must be capable of withstanding the
static head pressure of the system.
1. After subsequent idle periods, open the air vents and open the valve in the bypass line
around the discharge check and gate valves until liquid flows through the air vent openings.
2. Close the air vents and the bypass shutoff valve.
3. Start the pump and open the discharge gate valve.
The valve in the bypass line can be left open so that loss through the foot valve is
constantly replenished from the discharge line left open during idle periods.
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Model 3610, API Type BB1 API 610 11th Edition Installation, Operation, and Maintenance Manual