Pump operations scfa study guide || All Questions Answered Correctly.

what are two basic pressurized water supply sources used to supply a fire pump correct answers hydrant and a supply hose from another fire pump what are some of the dangers of operating at a vacuum from a pressurized water source from a hydrant correct answers increases the possibility of damage to the fire pump due to cavitation can cause damage to the pump and water system due to water hammer, may damage water heaters or other domestic appliances on a municiple water supply system what are some of the dangers of operating at a vacuum from a pressurized water source from another pumper correct answers can cause supply hose to collapse resulting in interruption of water supply, can damage the pump through cavitation what is a forward lay correct answers a forward lay involves stopping at the hydrant dropping the end of one or more supply lines at the hydrant and proceeding to the fire location. what is a reverse lay correct answers in a reverse lay hose is laid from the fire to the water source what checks should be made after making hydrant connections but before opening the hydrant correct answers the tank to pump valve must be closed if the intake is not equipped with a shutoff valve. a dry barrel hydrant must be opened all the way. what is the equation for determining the capacity of a square/ rectangular swimming pool correct answers lxWxDX7.5 l=length in feet w=width in feet d=average depth in feet and 7.5=number of gallons per cubic foot what is the equation for determining the capacity of a round swimming pool correct answers capacity in gallons =(pi) X R squared X D x 7.5 (pi)+3.14, r=radius or half the diameter in feet, D=average depth in feet, 7.5= number of gallons per cubic feet what is the equation for determining net pump discharge pressure correct answers NPDPdraft= PDP + intake pressure correction NPDP draft = net pump discharge pressure at draft PDP= pump discharge pressure in psi or kpa Name types of natural static water supply sources correct answers lakes ponds rivers and oceans what is the equation for determining the adequacy of a natural stream correct answers Q=A x V x 7.5 Q= flow in gpm, A= Area in ft squared, V= velocitiy in ft/min, 7.5= a constant (the number of gallons per ft cubed.) name some common types of man made static water supply sources correct answers cisterns, private water storage tanks, ground reserviors, swimming pools, agricultural irrigation systems