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Sprinklers > Week 7 > Flashcards

Week 7 Flashcards

1
Q

Hydrostatic test is?

A

200 psi/ 2hours

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2
Q

Systems normally subject to system working pressure over 150 psi shall be tested at?

A

50 psi in excess of system pressure

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3
Q

How can you test if there is a major drop in temperature anticipated?

A

An interim air test is permitted at 40psi for 24h. The hydrostatic test is still required at a better time.

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4
Q

When conducting a hydrostatic test where shall the test gauge be located?

A

Lowest elevation point because it’s under the most pressure

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5
Q

Initial installation of an FDC test is conducted at?

A

200psi or 50 psi in excess of maximum static pressure.

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6
Q

Dry pipe and double interlock preaction systems must be tested with?

A

Air and water. 200 psi/ 2h water, 40 psi/ 24h air 1 1/2 psi allowable leakage

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7
Q

An audible alarm is required in?

A

5 minutes

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8
Q

Main drain tests are to be performed?

A

Annually

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9
Q

Where can a wet system be installed?

A

Sprinkler systems shall be wet systems unless areas are subject to freezing or other special conditions.

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10
Q

State two advantages of a wet system?

A

Most reliable, cost effective, easy to maintain.

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11
Q

Where shall the inspectors test of a wet system be located?

A

Installed downstream of the water flow alarm, furthest point is preferred.

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12
Q

State two items which must be present in all wet system valve rooms?

A

Lighted, and heated.

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13
Q

What are two alarm devices that a wet system may contain?

A

Flow paddle switch, low pressure alarm switch ps120, alarm valve ps10

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14
Q

State how many sprinkler heads must operate in order to initiate an alarm?

A

Just one

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15
Q

Identify the amount of pitch required on the piping of a wet system.

A

Shall be permitted to be installed level

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16
Q

What device must be installed on an antifreeze system which is connected to a potable water supply to protect the water

A

Backflow prevention device

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17
Q

State some possible areas that an antifreeze system would be installed to protect

A

Often used to protect smaller portions of a wet system from freezing.

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18
Q

State the maximum size of an antifreeze system?

A

40 gal

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19
Q

State the device added to allow for expansion when a reduced pressure backflow preventer is installed.

A

Expansion chamber to compensate for thermal expansion.

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20
Q

State the minimum drop of an antifreeze loop when using a non potable water supply

A

5 ft

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21
Q

State the purpose of the 1/32” hole in the check valve of the antifreeze loop

A

To allow for expansion

22
Q

State the frequency antifreeze solutions shall be tested

A

Annually

23
Q

Where are dry systems normally installed.

A

Areas subject to freezing.

24
Q

What’s the maximum number of gallons which may be trapped before a dry system auxiliary drain is installed?

A

5 gallons

25
Q

What is the size of a light or ordinary wet system.

A

52,000 ft2

26
Q

What clearance must a valve room have from all panels or system valves?

A

36”

27
Q

Valve room enclosure must have drainage twice the size of the drain true / false

A

True

28
Q

What size pressure gauge must be used?

A

Rated for twice rated pressure

29
Q

Where must pressure gauges be installed?

A

Below alarm valve or riser check,
Above Alarm valve or riser check valve

30
Q

Where is a relief valve required in wet systems?

A

Downstream of any check valve

31
Q

Minimum relief valve size?

A

1/2”

32
Q

Where is an air vent required?

A

On all wet systems, installed at highest point.

33
Q

Where is the main drain located?

A

Downstream of the control valve

34
Q

5 - 50 gal of trapped water must have an auxiliary drain valve of what size

A

3/4

35
Q

When’s are auxiliary drains tested

A

Annually, and quarterly to confirm and exercise internal components. Or whenever a control valve has been closed and re opened

36
Q

What are two system audible alarms

A

Water motor gong, electric bell

37
Q

When shall system alarms be tested

A

Inspect quarterly, test quarterly

38
Q

Where do you test system alarms?

A

From the inspectors test connection

39
Q

Anti freeze solutions?

A

Glycerin (plastic), and propylene glycol

40
Q

How long shall an air compressor take to fill a system?

A

30 minutes, 60 minutes in a refrigerated space maintained below 5* F ( -15* C)

41
Q

Air supply connections shall be sized at

A

Min 1/2” above priming level of the valve

42
Q

What’s the drain size of an exhauster

A

2”

43
Q

How soon shall water be at an ITV in a dwelling unit

A

15 seconds

44
Q

Not greater than 500gal shall be permitted without a Q.O.D true/false

A

True

45
Q

750gal or more shall have a Q.O.D true/ false

A

True

46
Q

What is the pitch for areas subject to freezing?

A

1/2” per 10’ for branch lines and 1/4” for mains

47
Q

What is the pitch required for refrigerated areas?

A

1/2” per 10’ for branch lines and mains

48
Q

Where shall a dry pipe FDC be installed?

A

Between system control valve and the dry pipe valve

49
Q

Describe two tail end systems which may be connected to a wet system

A

Antifreeze loop, pre action system, deluge system, dry system

50
Q

State two antifreeze solutions permitted to be used with potable water supply

A

Glycerin, propylene glycol

51
Q

State the type of control valve that must be used on a reduced pressure back flow preventer

A

Supervised, indicating control valve.

Sprinklers (2 decks)

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