Drafting Flashcards
Hard sleeve should be submerged at least ______ if possible to prevent formation, of a whirlpool which might permit air to enter the pump
18 inches
If not possible to submerge hard sleeve 18” whirlpools can be prevented by placing a ________ at the water surface
Baffle
Baffles can be improvised from:
Salvage covers, wooden doors, or similar objects
Hard sleeve connections should be hammered tight with rubber mallet to
Prevent Leak
Strainer should be kept off bottom to prevent grit and abrasive material from entering the pump to ____ ______
Prevent block
6” Blind cap should only be _______ _______
Hand tight
Transfer Valve should be placed in _______ _________ when priming
Volume Position
Before priming the pump, all unused gates and valves shall be _______, and _______ _____ shall be placed on unused discharge gates
Closed, Blind Caps
Hydrant static pressure shall always be determined before opening the discharge gate
Because it tells operator necessary info to determine what the drop in hydrant pressure is when the line is supplied
When operating the priming pump increase engine pressure to ________ to assist the __________ ______ on the system
1300 RPM, Electrical Load
The priming time should not exceed __________. If the pump is not primed in this time, stop and look for ______ _____
45 seconds, Air Leaks
The following points should be checked upon failure to get water from draft:
- Operation done in proper order
- Gaskets in hard sleeve sand connections tight
- Recheck all valves for proper position check gates for leakage
- Whether there is oil in tank for priming pump
- Strainer submerged, but not resting on bottom
- Strainers are clear of foreign matter
When changing the position of the transfer valve on all pumps, the pump pressure shall be reduced to _______ when operating from draft, and to a_____ difference between intake and discharge pressure, when operating from a hydrant, two pump operation, or relay
50psi, 50psi
Where there is a doubt as to the best position of the transfer valve
Check it by delivering the desired amount of water at the required pressure, not the engine speed on the tachometer, change to the other position, adjust to the desired pressure , and note whether the engine speed is lower or higher . The pump shall be operated with the transfer valve in the position which develops the desired pressure at the lower engine speed
The transfer valve shall be placed in the pressure position of supplying under
500 GPM
