Sprinklers Flashcards by Erica Keating

What is the definition of Automatic spriklers?

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.

How well did you know this?

Not at all

Perfectly

What is the main advantage of wet systems?

Water discharges immediately from sprinklers opened by fire

How well did you know this?

Not at all

Perfectly

What does NFPA stand for?

National Fire Protection Association

How well did you know this?

Not at all

Perfectly

What does D mean in NFPA 13 D

Dwelling

How well did you know this?

Not at all

Perfectly

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

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

How well did you know this?

Not at all

Perfectly

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

135F - 170F

How well did you know this?

Not at all

Perfectly

What temp is the Intermediate activated at?

175 F

How well did you know this?

Not at all

Perfectly

Pendant style sprinklers are available in what styles?

Concealed or recessed

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

How well did you know this?

Not at all

Perfectly

Where are sprinklers not needed?

(4 points)

Bathrooms (55 sq ft or less)

Linen closets

Attics

Entrance foyers that are not the only means of egress

How well did you know this?

Not at all

Perfectly

What is the most important aspect of the sprinkler system?

The location

How well did you know this?

Not at all

Perfectly

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

Max distance to wall: 6 ft

Max distance between sprinklers: 8 ft

How well did you know this?

Not at all

Perfectly

At what distance is the discharge pattern fully developed?

4 ft below the sprinkler

How well did you know this?

Not at all

Perfectly

What happens if an obstruction cannot be avoided?

Additional sprinklers will have to be installed

How well did you know this?

Not at all

Perfectly

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

min of 13 gpm (gallons / min)

How well did you know this?

Not at all

Perfectly

What is the discharge rate of one sprinkler head?

18 gpm

How well did you know this?

Not at all

Perfectly

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

Brazed

How well did you know this?

Not at all

Perfectly

Joints for wet systems shall be…?

Brazed or solder metal (95-5)

How well did you know this?

Not at all

Perfectly

The hanger closest to the sprinkler must what?

Prevent upward mvmt of the piping

How well did you know this?

Not at all

Perfectly

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

6 inches

How well did you know this?

Not at all

Perfectly

What is the min pipe size of non metal?

¾ inches

How well did you know this?

Not at all

Perfectly

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

½ inch

How well did you know this?

Not at all

Perfectly

What is the min size of steel pipe?

1”

How well did you know this?

Not at all

Perfectly

What type of valve should residential water supply have?

A single shut off valve

How well did you know this?

Not at all

Perfectly

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

30 min

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

What is the Incipient stage of a fire?

No obvious signs of fire Thermal decomposition: tiny combustion particles Fire at this stage = no smoke, flame or heat

What happens at the Smoke stage?

Visible smoke Combustion increase size / output of particles No appreciable heat rise

What happens at the Flame stage?

Visible flame as gasses / particles ignite Outburst of flame = heat with high combustible gasses generated

What happens at the High Heat Stage?

Flames are at their peak Dense smoke present Oxygen is consumed Superheated gasses are generated

What are the Stages of Fire in order? | (I, S, F, HH)

Incipient stage Smoke stage Flame stage High Heat stage

What is used to detect the earliest stages of fire?

Smoke detectors Reacts to smoke

What type of smoke detector is the most common prniciple?

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

Testing for an NFPA 13 R residential system involves what?

Hydrostatic test

What PSI and how long do hydrostatic tests last for?

200psi or 50 psi (whichever working system is greater) Maintain pressure (w/o loss) for 2 hrs

What happens if weather is an issue for hydrostatic testing?

The system is temporarily tested with air permission needed from enforcing authority

How many times a year are sprinkler systems tested?

Alarms are tested 4 times a year

What are the 2 different styles of wet sprinkler systems?

Alarm check valve and Alarm flow switch

What is an Alarm Check Valve?

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

What is a Vane Type Flow Alarm Switch?

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

What does Should mean?

a recommended requirement

What does Shall mean?

A mandatory requirement

How should the water motor gong be piped?

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

What does the term Approved mean?

acceptable to the authority having jurisdiction

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

an approved device should be installed for reducing the pressure with the required flow. (needs to be kept at 100 psi)

Standpipe and hose systems are designed to provide what?

A manual means of extinguishing Class A fires

What are Wet Standpipe Systems?

Systems that have water under pressure at all times

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

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

What does OS and Y mean?

Outside Stem and Yoke

What are Ball drips?

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

Standpipe systems are used for what?

Type A Fires | (cloth, wood, paper and some plastics)

A Dry Pipe sprinkler system contains what?

Air or Nitrogen under pressure

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

Needs to be manually reset

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

Mains shall be sloped at a min of ¼" / 10'

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

Auxiliary Drain

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

Sprigs, nipple or candlestick

Standard pendant sprinklers are required to be installed on what?

Return bend.

What is the Min and Max on Fire Department Connections?

Max: 150' from a public hydrant w/ no obstructions Min: 10' and no further than 50' from the principal entrance to the building

What is the advantage of a Dry Pipe System?

Works very well in unheated occupancies

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

Sprig