Operation Under Usual Conditions (Cont)
2-116. PUMPING FROM DRAFT (MAIN INLET) (CONT).
Discharge caps should not be removed if water system is
under pressure. Discharge caps can act as projectiles if
released under pressure, causing injury or death to
If any discharge hose is used, make sure hose is removed
from hosebed, nozzle is securely attached, and nozzle is
turned off before opening any discharge valves. Failure to
comply may result in injury to personnel.
Open and close all valves slowly during any procedure.
Sudden changes in pressure may cause equipment to
react faster than personnel can be alerted. Make sure
surrounding personnel are aware of changes being made
to settings on equipment. Failure to comply may result in
injury or death to personnel and damage to equipment.
Cavitation can occur when pumping and air enters water.
If engine speed increases without an increase in pressure,
pump may be cavitating. Even though pump may be
primed, air leaks can cause rough operation and an
increase in engine speed without an increase in pressure
or flow. If an air leak is suspected, discontinue pumping
and isolate problem. Cavitation can also occur with large
nozzle tips. Solve this problem by reducing flow. Failure
to comply may result in damage to water pump.