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Bas. > 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 on _____

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 gong 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 through

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
What’s the difference between a differential dry pipe valve and a latching differential dry pipe valve?
Very similar, latching has a mechanical latch that assist the valve clapper to stay closed
26
What is the system air pressure in a low differential valve
15-20 psi above supply pressure
27
Low differential valves are not subject too
Water Column
28
Accelerators are to be installed as close ___
As practical to DPV
29
Where is the anti flooding device installed
Between accelerator and DPV
30
Drum drips are used where the capacity is over _____ in a dry system
5 gallons
31
Air shall be able to be restored in a system within ___ minutes (system above 5 degrees Fahrenheit)
30 minutes
32
Air shall be able to be restored in a system within ___ minutes (system below 5 degrees Fahrenheit)
60 minutes
33
Air supply is taken for a shop system w/ higher pressure then needed, what is required
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
Dry pipe valves controlling systems larger then 500 gals are usually required to have a
Accelerator or exhauster
35
How does an accelerator work
Admits sprinkler system air to the intermediate chamber, located beneath the clapper of a differential type valve
36
How does an exhauster work
Uses the movement of the diaphragm to open an auxiliary valve, which discharges system air pressure into the atmosphere
37
Quick opening device is to be located
As close as practical to the dry pipe valve
38
What needs to be installed between the dry pipe riser and an accelerator
Composition disc glove valve
39
What must be installed between the QOD and intermediate chamber
Check valve
40
Trapped section with less than 5 gallons of water, what is required
Drain no smaller then 1/2” and a plug or nipple cap
41
Trapped section larger then 5 gal In a dry system, what is required
Auxiliary drain/drum drip assembly
42
The alarm valve primarily acts as a ____ _____ in a wet system
Check valve
43
Where is the pressure flow switch installed with an alarm valve equipped with a retard chamber
Above the retard chamber
44
What kind of pumps are excess pressure pumps
Positive displacement
45
Where must paddles be bent towards on a paddle flow switch
Towards the water flow
46
In a dry pipe valve, the intermediate chamber is always open through the _______
Velocity drop
47
Which valve does not latch upon opening, which can lead to the valve closing before it’s fully drained
Low differential
48
Low differential valves must have a _____ installed to protect system piping from freezing
High water level signalling device, or automatic drain
49
Electrical signals from an alarm valve can operate
Fans/exhausts, close doors, sound electric bells, buzzers, horns, and strobes
50
Air maintenance devices shall be tested
Annually, during DPV trip test
51
Excess pressure pump provides how much pressure above city
30-50psi
52
Paddle flow switch must be installed how far from a change of direction
6”
53
Paddle flow switch must be installed how far from a control valve
24”

Bas. (8 decks)

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