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Plumbing Level 1 > Sprinklers > Flashcards

Sprinklers Flashcards

1
Q

What is the definition of Automatic spriklers?

A

Fire-suppression devices that operate automatically by discharging water over a specific area when the heat actuated element is heated to or above a preset temperature.

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2
Q

What is the main advantage of wet systems?

A

Water discharges immediately from sprinklers opened by fire

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3
Q

What does NFPA stand for?

A

National Fire Protection Association

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4
Q

What does D mean in NFPA 13 D

A

Dwelling

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5
Q

True or False: Painting the sprinkler system is a good idea

A

False: never paint the sprinkler or protective cap. (prevents thermal response of the heat-responsive element / may render the sprinkler inoperative)

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6
Q

For Residential Sprinklers: what is the temp range for Ordinary Temperature - rated at

A

135F - 170F

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7
Q

What temp is the Intermediate activated at?

A

175 F

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8
Q

Pendant style sprinklers are available in what styles?

A

Concealed or recessed

Concealed is covered by a cover plate (Know cover plate)

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9
Q

Where are sprinklers not needed?

(4 points)

A

Bathrooms (55 sq ft or less)

Linen closets

Attics

Entrance foyers that are not the only means of egress

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10
Q

What is the most important aspect of the sprinkler system?

A

The location

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11
Q

What is the spacing requirements for standard pendant or upright residential sprinklers?

A

Max distance to wall: 6 ft

Max distance between sprinklers: 8 ft

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12
Q

At what distance is the discharge pattern fully developed?

A

4 ft below the sprinkler

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13
Q

What happens if an obstruction cannot be avoided?

A

Additional sprinklers will have to be installed

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14
Q

What is the discharge rate of 2 or more sprinklers head?

A

min of 13 gpm (gallons / min)

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15
Q

What is the discharge rate of one sprinkler head?

A

18 gpm

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16
Q

How should pre-action / dry pipe systems be connected?

A

Brazed

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17
Q

Joints for wet systems shall be…?

A

Brazed or solder metal (95-5)

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18
Q

The hanger closest to the sprinkler must what?

A

Prevent upward mvmt of the piping

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19
Q

The end sprinkler in a pendant position must be supported within what of the end?

A

6 inches

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20
Q

What is the min pipe size of non metal?

A

¾ inches

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21
Q

If there are a min of 3 separate paths from supply shutoff valve, what size of nonmetallic or copper pipe may be used?

A

½ inch

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22
Q

What is the min size of steel pipe?

A

1”

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23
Q

What type of valve should residential water supply have?

A

A single shut off valve

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24
Q

How many min must the water supply be capable of supplying water requirements?

A

30 min

25
Q

The drainage pipe (that is required on the control valve side of system) shall be what in diameter?

A

1”

26
Q

What is the Incipient stage of a fire?

A

No obvious signs of fire

Thermal decomposition: tiny combustion particles

Fire at this stage = no smoke, flame or heat

27
Q

What happens at the Smoke stage?

A

Visible smoke

Combustion increase size / output of particles

No appreciable heat rise

28
Q

What happens at the Flame stage?

A

Visible flame as gasses / particles ignite

Outburst of flame = heat with high combustible gasses generated

29
Q

What happens at the High Heat Stage?

A

Flames are at their peak

Dense smoke present

Oxygen is consumed

Superheated gasses are generated

30
Q

What are the Stages of Fire in order?

(I, S, F, HH)

A

Incipient stage

Smoke stage

Flame stage

High Heat stage

31
Q

What is used to detect the earliest stages of fire?

A

Smoke detectors

Reacts to smoke

32
Q

What type of smoke detector is the most common prniciple?

A

Light Obscuration: Light projects from source to receiver. If smoke blocks the light, the alarm goes off.

33
Q

Testing for an NFPA 13 R residential system involves what?

A

Hydrostatic test

34
Q

What PSI and how long do hydrostatic tests last for?

A

200psi or 50 psi (whichever working system is greater)

Maintain pressure (w/o loss) for 2 hrs

35
Q

What happens if weather is an issue for hydrostatic testing?

A

The system is temporarily tested with air

permission needed from enforcing authority

36
Q

How many times a year are sprinkler systems tested?

A

Alarms are tested 4 times a year

37
Q

What are the 2 different styles of wet sprinkler systems?

A

Alarm check valve and Alarm flow switch

38
Q

What is an Alarm Check Valve?

A

they are designed to delay water pressure in the piping system until a sprinkler is activated.

39
Q

What is a Vane Type Flow Alarm Switch?

A

Is a device used to detect the flow of water through the system riser or through a zone control feed main of the automatic sprinkler system piping

40
Q

What does Should mean?

A

a recommended requirement

41
Q

What does Shall mean?

A

A mandatory requirement

42
Q

How should the water motor gong be piped?

A

Min of ¾” of galvanized, brass, copper or other approved corrosive-resistant material

43
Q

What does the term Approved mean?

A

acceptable to the authority having jurisdiction

44
Q

When an outlet exceeds 100 psi, what needs to happen?

A

an approved device should be installed for reducing the pressure with the required flow.

(needs to be kept at 100 psi)

45
Q

Standpipe and hose systems are designed to provide what?

A

A manual means of extinguishing Class A fires

46
Q

What are Wet Standpipe Systems?

A

Systems that have water under pressure at all times

47
Q

What do you have to be careful with when installing Wet Standpipe Systems?

A

Not to install any of the fire lines in an unheated area to prevent freezing of pipes.

48
Q

What does OS and Y mean?

A

Outside Stem and Yoke

49
Q

What are Ball drips?

A

Installed bn check valve and Siamese connection to ensure portion of pipe remains dry when not in use.

Ball Drips = ½ or ¾ “ ball check valves

50
Q

Standpipe systems are used for what?

A

Type A Fires

(cloth, wood, paper and some plastics)

51
Q

A Dry Pipe sprinkler system contains what?

A

Air or Nitrogen under pressure

52
Q

When the Clapper latch is open, what needs to be done?

A

Needs to be manually reset

53
Q

Drainage for Dry Pipe Systems need to be sloped to drain and…

A

Mains shall be sloped at a min of ¼” / 10’

54
Q

What type of drain must be readily accessible when Dry Sprinkler systems are subject to freezing?

A

Auxiliary Drain

55
Q

A vertical pipe that supplies a single sprinkler is called what?

A

Sprigs, nipple or candlestick

56
Q

Standard pendant sprinklers are required to be installed on what?

A

Return bend.

57
Q

What is the Min and Max on Fire Department Connections?

A

Max: 150’ from a public hydrant w/ no obstructions

Min: 10’ and no further than 50’ from the principal entrance to the building

58
Q

What is the advantage of a Dry Pipe System?

A

Works very well in unheated occupancies

59
Q

What is the name of a vertical pipe that supplies a single upright sprinkler?

A

Sprig

Plumbing Level 1 (14 decks)

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