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Engine Company Fire Ground Operations > 5 Water Supply > Flashcards

5 Water Supply Flashcards

1
Q

Mobile water supply apparatus generally carry how many gallons of water

A

1000 to 3500 gallons

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2
Q

Vehicles caring 1000 gallons of water or more of a fire pump are generally referred to as

A

Tankers

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3
Q

Water carrying apparatus with a standard fire pump and a large water tank used for fire attack or pumping water to pumpers on the fire ground referred to as

A

Pumper tankers

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4
Q

Vehicles carrying 1000 gallons of water or more without a fire pump but may utilize a small PTO driven pump, specifically designed to carry water to fire are called

A

Tenders

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5
Q

A method to offload tanker water where pressurized water stream is used to increase the velocity of a larger volume of water that is flowing by gravity through a dump valve

A

Jet assist

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6
Q

A method to offload tanker water where the tank is pressurized to assist in expelling the water through the dump valve

A

Pneumatic system

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7
Q

What determines the number of attack lines to be placed in service

A

The supply of water that can be maintained

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8
Q

Water delivery capacity of a pumper is limited by the

A

Capacity of the pump, the number of suction intakes, and discharges

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9
Q

Operation of a pumper is limited by

A

Engine speed and residual pressure

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10
Q

Pump systems must be capable of delivering the following

A

100% rated capacity at 150 psi.
70% of rated capacity at 200 psi.
50% of rated capacity at 250 psi

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11
Q

Pumpers are rated from which type of water source

A

At draft from the static water source

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12
Q

True/false pumpers cannot exceed their rated capacity if they are receiving water under positive pressure

A

False pumpers can exceed capacity when being fed positive pressure water

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13
Q

Which type of valve can be used to receive water from two different supply lines of minimum 2 1/2 inches

A

Gated suction Siamese valve

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14
Q

Minimum size of discharge outlets to provide the rated capacity of the pump

A

2 1/2 inches or larger

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15
Q

Usual practice is to install wanted to and a half inch discharge for each what in rated capacity of a pump

A

One 2 1/2 inch discharge for each 250 gallons per minute of rated capacity

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16
Q

The pump must not be operated about what percent of it’s rated peak speed for any length of time

A

80%

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17
Q

An increase in engine pump speed, RPM, that does not result in an increase in discharge pressure indicates what

A

That the pumper has reached it’s pumping capacity or limit of the water supply

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18
Q

Pump operators should maintain a residual pressure of what at all times

A

20 PSI or more at all times

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19
Q

The residual pressure of a pump should not be allowed to drop below what

A

10 psi except under extreme conditions

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20
Q

If minimum allowable residual pressure, 10 psi, is reached, the proper procedure is to

A

Notify the company officer lower discharge pressure never shut down a hose line without knowledge and consent

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21
Q

If action is required to limit the flow of water to increase residual pressure who should determine what actions to be taken to correct the problem

A

The incident commander

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22
Q

A measure of the reserve capacity of the hydrant is what

A

Residual pressure

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23
Q

As more water is taken from the hydrant what happens to residual pressure

A

It drops, The more water taken the less water remains as potential capacity

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24
Q

As flow rate increases what happens to friction loss

A

Friction loss increases

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25
Q

Hose that is designed to convey water to hose line nozzles, distributor nozzles, master stream appliances, portable hydrants, manifolds, standpipe and sprinkler systems, and pumps used by the fire department.

A

Attack hose

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26
Q

Hose that is designed for moving water between a pressurized water source and a pump that is supplying attack lines

A

Supply hose

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27
Q

When and LDH is used to supply attack lines master streams hydrants manifolds standpipes and sprinklers what should be used

A

A pressure relief device with a maximum setting of 200 psi

28
Q

The standard hose of the fire service nationally is

A

2 1/2 inch hose

29
Q

A 2 1/2 inch supply line should not be used to deliver more than how many gallons per minute

A

350 gallons per minute

30
Q

Per 100 feet the friction loss of 2 1/2 inch hose flowing 350 gallons per minute is

A

25 PSI per 100 feet

31
Q

Friction loss of 2 1/2 inch hose operating at 250 gallons per minute per hundred feet

A

15 psi per 100 feet

32
Q

True/false two, 2 1/2 inch supply lines is preferred over one 2 1/2 inch supply line flowing over 350 gallons per minute

A

True

33
Q

What is required of hose to decrease the friction loss as well as the number of his lines needed to move a given amount of water

A

Increase the diameter of the hose

34
Q

One 3 inch line is almost as effective as how many 2 1/2 inch lines

A

Two

35
Q

What defines an LDH as hose with an inside diameter of 3 1/2 inches or larger

A

NFPA 1961

36
Q

4 inch LDH delivers a volume of water approximately equivalent to how many 2 1/2 inch hose

A

3 1/2, 2 1/2 inch hose lines

37
Q

5 inch LDH delivers a volume of water approximately equivalent to how many 2 1/2 inch hose lines

A

Six 2 1/2 inch hose lines

38
Q

A pumper approaching the fire from a water source should perform which type of lay

A

Forward lay

39
Q

If a pumper arrives at the fire first which type of lay should be used from the fire

A

Reverse lay from the fire to a water source

40
Q

As a rule, under average conditions, what pressure should a pumper at a hydrant initially begin pumping to a unit at the fire

A

100 psi

41
Q

To counteract friction loss of long lays exceeding 1000 feet what type of pumping method should be used

A

Relay pumping

42
Q

The maximum capacity of a relay operation is determined by what

A

The smallest pump capacity and or the smaller supply hose use in the relay

43
Q

If LDH is not being used to supply lines should be laid initially only if what

A

They can be laid simultaneously

44
Q

If LTH is not being used for initial supply line and conditions permit what should be done for supply lines

A

Lay two supply lines

45
Q

When initiating a relay pump, what is the process of charging LDH

A

Pump at water supply charges hose to second pumper, second pump opens intake and charges supply line to third pumper

46
Q

At the start of the really operation all pumpers in the line should set up to pump what pressure to the pumper at the fire

A

150 psi

47
Q

During a relay pump, if additional water is needed, relays capacity is exceeded, what should be done

A

Another supply line should be late between the operating pumpers

48
Q

Static pressure is

A

The pressure in the water pipe with no water is flowing

49
Q

Residual pressure is

A

The pressure remaining in a water distribution system while the water is flowing. The residual pressure indicates how much more water is potentially available

50
Q

Three factors influence the movement of water at fires, they are

A

Water source, pumper, hose

51
Q

The four possible water sources at the fire ground are

A

Watermain systems,
static water sources,
apparatus water tanks,
mobile water supply apparatus.

52
Q

Flow test of the water main system and components should

A

Be done by the fire department for the fire department should be part of the process

53
Q

Areas with what type of water mains are especially vulnerable to water supply problems

A

Dead and mains and small mains

54
Q

What type of gauge is used to measure static and residual pressure of intake

A

Compound gauge

55
Q

At the beginning of the pump operation the driver reads the compound gauge with the hydrant open and all discharge gates closed, showing which type of pressure

A

Static

56
Q

With one attack line charged to the proper discharge pressure of the compound gauge is read again, Showing what

A

Residual pressure

57
Q

What gives you the true measurement of available water

A

The difference between static and residual pressure

58
Q

When estimating attack lines drop of about 5% from the static pressure to the residual pressure indicates how much more can be delivered by the hydrant

A

Three equal parts equivalent to the amount being delivered

59
Q

When estimating attack lines a static to residual drop off 10% indicates how many more equal parts can be supplied from the hydrant

A

Two more equal parts

60
Q

A static to residual pressure drop of 20% indicates how many more parts can be delivered from the water main system

A

One more equal part

61
Q

In regard to supplying fire attack hose lines from the apparatus water tank and smoke or fire showing situations, is it acceptable

A

Yes but An uninterrupted supply of water must be established

62
Q

When operating a take a shuttle as a water supply house should tankers be filled

A

By pumper stationed at the water source

63
Q

Pumper intakes in the United States must have

A

National hose male threads

64
Q

Quick friction loss calculation for 2 1/2 inch hose by gallons per minute

A

Take the number of gallons per minute drop the last digit subtract 10. 350, drop zero, subtract 10. 25 psi per 100ft

65
Q

The proper size hose for a supply line is

A

Always LDH if available

66
Q

Name the two main types of mobile water supply apparatus

A

Tanker and tender

Engine Company Fire Ground Operations (10 decks)

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