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Crocodiles > Wet and Dry Pipe Valves > Flashcards

Wet and Dry Pipe Valves Flashcards

1
Q

Vane type flow paddle will not operate ______

A

Water motor gong

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2
Q

Audible alarm must be heard within

A

5 minutes

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3
Q

Piping between the sprinkler system and pressure actuated alarm initiating device shall be

A

Non corrosive pipe, no smaller then 3/8”

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4
Q

Alarm line is to be auto drained through

A

A restricted orfice

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5
Q

Drain pipe on alarm line to be no smaller than

A

1/4”

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6
Q

Paddle type water flow alarm indicators shall be installed in _____

A

Wet systems only

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7
Q

PS10 switch is

A

Alarm switch, can be used on any system

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8
Q

PS120 is

A

Supervisory, low water pressure
Generally used on wet systems

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9
Q

PS40 is

A

Supervisory, Low air
Generally used on dry systems

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10
Q

The 3 different kinds of seating arrangements for alarm valves are

A

Split/Groove
Pilot Port
Divided ring

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11
Q

Which seating arrangement has grooved rings with a large channel for feeding alarm line

A

Split/Groove

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12
Q

Which seating arrangement has a separate clapper and larger opening to the alarm line that is prone to issues

A

Pilot Port

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13
Q

Which seating arrangement has 2 separate rings with small holes between the seats

A

Divided ring

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14
Q

Water motor gongs need

A

Constant water supply to operate

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15
Q

Piping for water motor going can not be less than

A

3/4”

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16
Q

Maximum vertical distance WMG can be from alarm valve is

A

20’

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17
Q

Maximum horizontal distance WMG can be from alarm valve is

A

75’

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18
Q

Excess pressure pumps must be

A

Hardwired

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19
Q

Excess pressure pumps can either be

A

Manual or automatic

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20
Q

A retard chamber takes ______

A

Small surges from city supplies and discharges them to the drain

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21
Q

Where does a retard chamber generally vent though

A

Water motor gong pipe

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22
Q

A wet pipe system shall be provided with a relief valve no less then

A

1/2” in size and set to operate at 175psi

23
Q

When are relief valves not required?

A

Where auxiliary air reservoirs are installed to absorb pressure increases

24
Q

The 4 common types of dry pipe valves are

A

Differential
Latching differential
Mechanical
Low differential

25
Q

What’s the difference between a differential dry pipe valve and a latching differential dry pipe valve?

A

Very similar, latching has a mechanical latch that assist the valve clapper to stay closed

26
Q

What is the system air pressure in a low differential valve

A

15-20 psi above supply pressure

27
Q

Low differential valves are not subject too

A

Water Column

28
Q

Accelerators are to be installed as close ___

A

As practical to DPV

29
Q

Where is the anti flooding device installed

A

Between accelerator and DPV

30
Q

Drum drips are used where the capacity is over _____ in a dry system

A

5 gallons

31
Q

Air shall be able to be restored in a system within ___ minutes (system above 5 degrees Fahrenheit)

A

30 minutes

32
Q

Air shall be able to be restored in a system within ___ minutes (system below 5 degrees Fahrenheit)

A

60 minutes

33
Q

Air supply is taken for a shop system w/ higher pressure then needed, what is required

A

A relief valve between outlet of the air maintenance device and the dry system and set to relieve 20 psi above the operating pressure

34
Q

Dry pipe valves controlling systems larger then 500 gals are usually required to have a

A

Accelerator or exhauster

35
Q

How does an accelerator work

A

Admits sprinkler system air to the intermediate chamber, located beneath the clapper of a differential type valve

36
Q

How does an exhauster work

A

Uses the movement of the diaphragm to open an auxiliary valve, which discharges system air pressure into the atmosphere

37
Q

Quick opening device is to be located

A

As close as practical to the dry pipe valve

38
Q

What needs to be installed between the dry pipe riser and an accelerator

A

Composition disc glove valve

39
Q

What must be installed between the QOD and intermediate chamber

A

Check valve

40
Q

Trapped section with less than 5 gallons of water, what is required

A

Drain no smaller then 1/2” and a plug or nipple cap

41
Q

Trapped section larger then 5 gal, what is required

A

Auxiliary drain/drum drip assembly

42
Q

The alarm valve primarily acts as a ____ _____ in a wet system

A

Check valve

43
Q

Where is the pressure flow switch installed with an alarm valve equipped with a retard chamber

A

Above the retard chamber

44
Q

What kind of pumps are excess pressure pumps

A

Positive displacement

45
Q

Where must paddles be bent towards on a paddle flow switch

A

Towards the water flow

46
Q

In a dry pipe valve, the intermediate chamber is always open through the _______

A

Velocity drop

47
Q

Which valve does not latch upon opening, which can lead to the valve closing before it’s fully drained

A

Low differential

48
Q

Low differential valves must have a _____ installed to protect system piping from freezing

A

High water level signalling device, or automatic drain

49
Q

Electrical signals from an alarm valve can operate

A

Fans/exhausts, close doors, sound electric bells, buzzers, horns, and strobes

50
Q

Air maintenance devices shall be tested

A

Annually, during DPV trip test

51
Q

Excess pressure pump provides how much pressure above city

A

30-50psi

52
Q

Paddle flow switch must be installed how far from a change of direction

A

6”

53
Q

Paddle flow switch must be installed how far from a control valve

A

24”

Crocodiles (8 decks)

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