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Flashcards in Pump Manual Deck (40):
1

What should be done when making adjustments in pressure to avoid serious damage?

Adjust slowly

2

What is the most convenient option to prevent overheating of the pumps?

Open tank fill valve

3

What is the relief valve pressure pre-set at?

150psi

4

he transfer valve should be placed in pressure if supplying under how many gpms?

500

5

The D.C. Fire and EMS department when writing specifications for the purchase of pumping apparatus, requires the standard _______________hour acceptance test?

3 hour

6

What NFPA guideline is used for fire department hose?

NFPA 1962

7

While conducting the annual service test, What is the position of the discharge gates set at to either create friction loss or achieve higher pressure?

Partially close the valves

8

The total length of any hose to be tested shall not exceed _________________ feet and be secured at the end with a hose rope 10-15 inches behind coupling?

300

9

How often shall air tanks be bled?

Daily

10

What is the friction loss for a hydrant valve?

25psi

11

What is the friction loss of a ladder pipe assembly ( Siamese, 100’ 3” hose, ladder, pipe)?

50psi

12

What is the friction loss for a standpipe system?

25psi

13

What is the friction loss of a cellar pipe?

25psi

14

When charging a metro standpipe connection, at what psi must be used?

Hydrant pressure with two lines

15

Pressure is defined as?

A force divided by the area over which it is distributed

16

Layers of liquid move at different speeds, starting with little or no movement where the liquid is in contact with the solid boundary, and achieving greater and greater velocities toward the center of the flowing stream. This is called:

The laminar effect

17

This part of the centrifugal fire pump permits the water passing through the gradually enlarging area to be reduced in velocity with a corresponding increase in pressure

Volute

18

What is the maximum discharge pressure for single stage centrifugal pumps in the District of Columbia Fire Department?

300psi

19

If pumping is already in progress and it becomes necessary to change from pressure to capacity, or vice-versa, the pump pressure should be reduced to within how many psi of the pump intake pressure.

50

20

What is the maximum layout of dual 3-inch lines when pumping the capacity of a 1250 GPM pump?

350'

21

What is the maximum layout of dual 3-inch lines when pumping the capacity of a 1500 GPM pump?

250'

22

What is the nozzle pressure and GPM for the foam eductor in the foam position?

200psi
95gpm

23

When setting up for draft, how many inches must the end of the hard sleeve be submerged to prevent the formation of a whirlpool?

18

24

During the operation of a pumper from a hydrant the available water supply is considered as having been fully used when the intake pressure gauge drops to what PSI?

5

25

In the braking system when the pressure drops to what psi does the emergency diaphragm in the safety activator apply the air brakes?

40psi

26

On D.C. Fire Department apparatus who is allowed to operate the “Emergency” Air for release of the Maxi-Brake Control?

Fleet maintenance personnel

27

What are the dimensions of the “hard sleeves” carried on D.C.F.D. apparatus?

6" diameter
10' long

28

The height in feet that a pump is located above a body of water, in a draft operation is referred to as what

Lift

29

What is the friction loss for wagon pipe/monitor nozzle?

20psi

30

What is the maximum operating engine pressure?

300psi

31

What is the weight of one US Gallon of water?

8.35 pounds

32

What does one cubic foot of water weigh?

62.5 pounds

33

What is the engine pressure initially set at for a combination sprinkler/standpipe system?

175psi

34

What is the engine pressure initially set at when supplying a sprinkler system?

125psi

35

What is the friction loss of a standpipe connection?

25psi

36

When operating the priming pump, what RPM shall the engine be set at to assist with the electrical load being placed on the system?

1300RPM

37

What is the atmospheric pressure at sea level?

14.7psi

38

A pump operating at 100 pounds per square inch has an acceptable leakage rate at the packing of low many drops per minute?

10-20 drops per minute

39

How often is a service test performed on pumping apparatus in the DCFD?

Annually

40

The atmospheric pressure is reduced by how many psi per 1000ft of elevation above sea level?

0.5psi