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31

Intake gauge is also known as

Compound gauge

32

Intake/compound gauge

Registers intake pressure (psi) from pressurized source or vacuum (inHg) when drafting.

33

Discharge gauge

Registers discharge pressure on charged lines. 2 types are master (overall PDP) and individual/port (pressure for individual line).

34

Static pressure

Pressure of the water at rest in a system

35

Residual pressure

Pressure left in the system while water is flowing

36

Flow pressure

Forward velocity pressure at a discharge opening while water is flowing

37

Friction loss

Loss of pressure created by the turbulence of moving water against the wall of the hose or pipe

38

Tandem pumping

Short relay operation (usually side by side) where one pumper discharges water to the intake of a second pumper. The second pumper then boosts the pressure even higher. Essentially two pumpers placed together to work as a two-stage pump in series mode.

39

Dual pumping

Operation where a strong hydrant is used to supply two or more engines by connecting them intake to intake.

40

Size of tank to pump piping

3" to 3.5"

41

GPM limit when pumping from tank

500 GPM

42

Safe minimum of your intake gauge

20 psi

43

What is the size of the main supplying the hydrant and what does it mean?

At least 6", meaning if you have a 4" or 5" hose from a steamer port of the hydrant, there is still water left from that 6" pipe.

44

Theoretical Lift

The amount water can be raised by atmospheric pressure in a controlled environment.

45

Maximum Lift

The height a pumper in good condition can be expected to lift water at draft. Generally 2/3 of theoretical lift.

46

Dependable Lift

The height a column of water can be lifted while still providing a reliable fire flow. 14.7 feet at sea level.

47

Source Pumper

The engine connected to the water supply at the beginning of the relay operation.

48

Attack Pumper

The engine located at the fire scene that receives incoming water and discharges the water for fire attack.

49

LDH

3.5" to 12" hose

50

MDH

2.5" or 3" hose

51

What is attack hose service tested at?

300 psi

52

When should a relay operation be considered?

When more than 300 GPM is the needed fire flow.

53

Standard maximum pressure for relay pumping.

180 psi (Pump tested at 250 psi, 50 psi safety margin, 20 psi safety residual)

54

Tender/tanker

Apparatus designed to carry 1000-3000 gallons of water and must be able to fill and dump at a rate of 1000 GPM.

55

Nurse tender

Large capacity tender/tanker that sits next to the attack engine and receives all the shuttle water to provide an uninterrupted water source for the attack pumper.

56

Fill site layout in tender supply evolution

Both 2.5" ports have a hydrant gate valve, lay out and connect 2 50-foot sections of 2.5" supply hose to the gate valves and then open the hydrant.

57

Modern fire apparatus use what type of priming pumps?

Rotary vane or rotary gear pumps

58

How is the priming pump powered?

On older apparatus, by a small starter motor. In newer apparatus, by a multistage venturi powered by compressed air.

59

What is the maximum amount of time to achieve a prime?

30 seconds for 1250 gpm pump, 45 seconds for 1500 gpm pump