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Crocodiles > Wet, Dry & Anti-Freeze Systems > Flashcards

Wet, Dry & Anti-Freeze Systems Flashcards

1
Q

Wet system pressure gauge connection to be no smaller then

A

1/4”

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2
Q

Which gauge cannot be calibrated

A

Standard gauge

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3
Q

Relief valves are to be a minimum of what size and what pressure

A

1/2” in size, 175psi or 10 psi over system pressure, whichever is greater

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4
Q

Air venting is required on

A

All systems using metallic piping

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5
Q

Air vent manual valve to be a minimum of ___ in size

A

1/2”

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6
Q

What is the purpose of air venting a wet system

A

Get rid of as much trapped air as possible, minimize corrosion, microbial activity

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7
Q

Wet system low point drain less then 5 gallons

A

1/2 plug or cap
Full draining via removal of single pendant
Easily separated flex coupling

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8
Q

Wet system, low point on system more then 5, less then 50 gal

A

3/4 valve

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9
Q

Wet system, low point on system larger then 50 gals

A

1” valve

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10
Q

How often should drain connections be tested

A

Annually or as needed

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11
Q

Main drain tests, what is the percentage of reduction in flow pressure that shall be corrected

A

10%

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12
Q

How often are alarm devices to be tested

A

Quarterly

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13
Q

Hydraulic nameplate is required to have

A

All hydraulically calculated wet systems / inspect monthly

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14
Q

Anti freeze information sign shall indicate

A

Location of anti freeze system
Location of Auxiliary&low points

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15
Q

Dry system air shall be able to be restored in ______ minutes (above -15C)

A

30 minutes

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16
Q

Dry system air shall be able to be restored in ______ minutes (below -15C)

A

60 minutes

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17
Q

Air supply connections shall be a minimum of what size

A

1/2”

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18
Q

Air supply must enter the valve

A

Above priming level

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19
Q

What’s the purpose of an air maintenance device

A

To control pressure and air flow

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20
Q

Where is an air maintenance device not required

A

When a compressor has a capacity of less then 5.5ft3 at 10psi

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21
Q

How many dry pipe valves per air maintenance devices

A

One

22
Q

What is required when using a stored supply to refill a dry system

A

A low pressure alarm

23
Q

When nitrogen is coming from a stored supply what must be used

A

A pressure regulator

24
Q

Dwelling units ITV delivery time

A

15 seconds

25
Q

500 and gallons and less, ITV delivery requirements

A

No quick opening device required, no required delivery time

26
Q

750 gallons and less ITV water delivery requirements

A

QOD permitted, no required delivery time

27
Q

ITV min pipe size

A

1”

28
Q

Air pressure in dry system shall be

A

Based off manufacturer literature or 20 psi above trip

29
Q

Check valves used for subdivisions shall have a ____ hole drilled in the clapper to allow for equalization

A

1/8”

30
Q

What kind of system is gridded permitted in

A

Wet only

31
Q

Tie in drains for dry pipe systems shall be

A

1”

32
Q

Areas subjected to freezing, what is the pitch

A

Mains - 1/4” per 10’
Brand lines - 1/2” per 10’

33
Q

Auxiliary drains located in refrigerated areas shall not be smaller then

A

1”

34
Q

Minimum size nipple for drump drip

A

2”x12”

35
Q

Where is FDC installed on a dry pipe system

A

Between the system control valve and the dry pipe valve

36
Q

Dry system air test consists of

A

40 psi for 24 hours

37
Q

Leakage in dry system air test cannot be more then

A

1-1/2 psi

38
Q

Dry system integrity test is

A

40 psi 2 hours

39
Q

System operational test is performed through the

A

ITV

40
Q

Refrigerated area temperature is

A

Any area maintained below 0 degrees Celsius (32F)

41
Q

Pipe pitch in refrigerated areas shall be

A

1/2” per 10’ on all pipe

42
Q

Air supply in a refrigerated area must have

A

2 supply’s, minimum of 1” in diameter

43
Q

What temp requires a dry pipe/pre action system to be installed

A

4 degrees Celsius or 40 F

44
Q

Max size of wet system in light and ordinary hazard

A

52,000ft2

45
Q

Max size of extra hazard scheduled system

A

25 000ft2

46
Q

Max size of extra hazard, hydraulically calculated and high piled storage

A

40 000ft2

47
Q

What should the size of the floor drain in the valve room be

A

Twice the diameter of the main drain pipe

48
Q

Adequate clearance in valve rooms is

A

3’0 around valve
4’0 in heated enclosure

49
Q

What is used to measure the freezing point in an anti freeze system

A

Ratractometre

50
Q

What is a ratractometre calibrated with

A

Distilled water

Crocodiles (8 decks)

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