Pierce Pumper, Руководство по эксплуатации и техническому обслуживанию

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Pierce Pumper / 3-25
OPERATION
3-10. Changing from Tank to External Pressurized Water Supply (with Gated Intake Valve)
Figure 3-4: Typical Gated Intake Valves
POM0034, 0035, 0036
Soon after the pump is running and water is being supplied to the discharge lines, you need to establish an external
source of water BEFORE the water tank is empty. This supply can come from a hydrant, from another apparatus,
or from a draft source, such as a pond, river, or portable tank.
A gate intake allows you to maintain water flow at the same pressure at the same time you switch to an external
water supply.
In the absence of a gate intake valve, clear fire fighters from the attack area before you change to external water
supply, because you will lose all water pressure.
Most fire departments provide their own gate valves. Pierce recommends use of a gate valve.
Before using water from a hydrant, open and vent the hydrant for about 30 seconds to flush out gravel or debris.
Always use intake strainers. Gravel can damage the pump and reduce pressure.