Chp 8 Fire pump Characteristics Flashcards
(27 cards)
The single stage fire pump impeller is sometimes known as the ______. Pg 276
double suction impeller
Because the impeller turns at a high rate off speed, a ______ develops as the water goes to the discharge outlet.
radial thrust
_____ refers to the process of switching between pressure and volume in the apparatus.
changeover
A multistage centrifugal pump may contain up to _______ connected in series to provide high pressure
4 impellers
To restore capacity without replacing the entire pump, ________ in the pump casing may be replaced to maintain the preferred spacing between the hub of the impeller and the casing. PG280
wear rings or clearance rings
Friction develops heat where the packing rings contact the shaft. To over come the generation of heat , a spacer known as a___________ provides cooling. Pg 281
a lantern or slinger ring
With the engine idling and pump engaged, most midship transfer case pumps’ speedometers should indicate between ________
10 to 15 mph
The collar that slides across the shaft in a midship transfer case to lock into the pump or road gear ,ay not make it across because of misaligned or mushroom teeth, known as _______ pg 284
butt tooth condition
Apparatus with _______ offer key advantages, including a more even weight distribution on the chassis and more usable compartment space pg 286
rear mount pumps
According to NFPA 1900 , an individual gauge must sit with in ________ of the discharge control.
6 inches
Of a flow meter is provided for an individual discharge , it must be within_____ of the pressure gauge.
2 inches
The piping system and the fire pump itself must be able to withstand a hydrostatic test of ______ before being placed into service. PG 291
500 psi
According to NFPA 1900, pumpers with a tank capacity of less than _______, should have a piping capable of flowing 250 rpm.
500 gallons
May pumpers come equipped with tank to pump piping as large as ________. pg 291
4 inches
______ in modern pumps prevent damage to the tank if the tank-to-pump valve stays open while water goes to the pump under pressure, such as during a relay operation. pg 291
check valve
When using a static source, the priming pump will remove all or most of the air from the pump by lowering the__________ within the pump casing.
atmospheric pressure
Pumps rated greater than _____ capacity may require multiple large intake connections at each location
1500 gpm
As a minium, all fire apparatus with a rated pump capacity of 750 gpm or greater must be equipped with at least _____ 2 1/2 inch discharges. Pg 292
2
NFPA 1900, all valves should be designed and maintained to operate at pressures up to _______.
250 psi
Tanks that are 1000 gallons or greater must be provided with at least a _______ tank fill line. Pg294
2 inch
Circulator and ________ are piped with small- diameter copper tubing with a limited flow Capacity. Pg294
booster line cooling valve
A ________valve drains standing water below 50 psi, and a __________ valve works as a miniature quarter- turn ball valve that can drain drain or bleed off higher pressures with out damage. pg 294
spool , drain/bleeder
NFPA 1900 requires all intakes or discharges that are ______or greater to be equipped with slow acting valve controls. Pg 296
3 inches
Pressure governors regulate engine speed to match the _-_______ requirements
Pump discharge
