mid term

What is the function of the fusible element in a spray sprinkler?

The fusible element holds a cap or plug tightly against the orifice, controlling the discharge of water.

Name the two types of fusible elements used in spray sprinklers.

Solder link and frangible bulb.

How does a solder link fusible element operate?

When heated to its operating temperature, the solder melts, allowing the linkage to come apart and water to flow.

What materials are commonly used for solder in solder link fusible elements?

Tin, lead, cadmium, and bismuth.

What is the purpose of the temperature rating for sprinklers?

To prevent accidental operation due to high ambient temperatures and control the number of operating sprinklers in a design area.

What is the minimum pressure required for a sprinkler head to operate properly?

A minimum pressure of 7 psi.

What is the K-factor for a ½" orifice?

5.6 gallons of water can flow through a ½" orifice at 1 psi.

After what year are standard sprinklers considered spray sprinklers

1953

What is the difference between quick response and standard response sprinklers

thermal sensitivity

What is the flow of a 8.0 k factor sprinkler at a pressure of 16 psi

32

in which hazard classification are quick response sprinklers prohibited

Extra hazard

In an extra hazard occupancy, why might high temperature sprinklers be installed throughout

Prevent sprinkler skipping

What is the maximum distance the sprinkler deflector can be below a beam in obstructed construction

6"

How many spare sprinklers are required on a system containing 1100 sprinklers

24

In unobstructed construction, what is the minimum distance the sprinkler deflector below the ceiling

1"

State the minimum distance from hanger rod to an upright sprinkler

3"

Identify the colour code for an intermediate temperature sprinkler

Green Bulb White colour code

What is the maximum coverage area per sidewall sprinkler installed in an ordinary hazard

100 ft^2

when installing upright sprinklers on a 6" main, what is the minimum length of the sprig required

18"

Which of the following does not permit the installation of sidewall sprinklers

Extra hazard occupanices

Identify the maximum coverage area for standard spray sprinkler

225 ft^2

What is the maximum size of a small room

800 ft^2

State what is permitted to be used to protect sprinklers from over spray

Thin paper bags

What determines a sprinklers installation orientation

Deflector

Open sprinklers are used on

Deluge systems

Which of the following sprinklers is permitted to be reinstalled after it has been removed from a fitting

Dry sprinkler

What is the minimum distance required between a standard spray sprinkler deflector and top of the storage

18"

What sprinkler is a Conventional sprinkler?

old style sprinkler

Standard Sprinklers cannot be re installed once removed.

True

most commonly applied corrosion resistant coating?

wax

can caulking be used to secure concealed cover plates in areas with difficult to access ceilings?

No

a conventional sprinkler directs 40% to 60% initially in upward direction.

False

what is the max ceiling temperature for high temp classification?

225F

Is colour coating of sprinkler arms required by NFPA 13?

No

what colour code is extra high temp classification?

Red

when must sprinklers be protected with guards?

when subject to mechanical injury

what is the minimum amount of heads that shall be maintained in the head box?

6

what other item/s are required to be in head box?

Head wrench & 1" plug

a list of sprinklers installed on the premises is recommended to be placed in the head box.

True

what is the purpose of protective caps on sprinklers?

to protect elements from damage during shipping

sprinklers installed in an unventilated attic shall be of what temperature classification?

intermediate

when installing a head in a freezer with automatic defrost, what do you base your temperature rating off of?

max temperature of normal operation

sprinklers that are required to be used in light hazard occupancy are ordinary & intermediate.

True

You can use SR heads when modifying a light hazard occupancy building.

True

A strainer shall be installed on the supply side of sprinklers with nominal K-factor less than?

k-2.8

open sprinklers shall be permitted to be used in ___ systems to protect special hazards.

Deluge systems

when are additional sprinklers to be installed under fixed obstruction?

larger than 4' wide

what are the maximum distance of sprinklers from outside edge & below obstructions?

3" from edge & 12" below

sprinklers shall be omitted from skylights exceeding ___ square feet.

32

what is the maximum size pipe that an upright sprinkler can be directly installed on without obstruction?

2 1/2"

deflector arms shall be parallel to the pipe it is installed on.

True

what is the minimum distance between sprinklers in light hazard occupancy?

6’

how large can a soffit be before you must install a sprinkler underneath?

8"

what is the nominal orifice size of a sprinkler with a k-factor of 5.6?

1/2"

What thickness of cellophane bags can be used to protect against overspray according to NFPA 13?

0.003

Thin Paper bags cannot be used to protect sprinklers from overspray.

False

what colour frangible bulb is used in extra high temperature sprinklers?

Purple

what is the temperature rating for ordinary temperature heads?

135-170f

What is the temperature rating for High temperature classification?

250-300f

the ultra high temperature rating is 650f or greater

True

What equation is used to find Q?

Q= K(vP)

What does Q stand for in the triangle?

Flow (gpm)

How would I identify the orientation of a sprinkler head at a glance?

deflector

what liquid is used in modern day frangible bulb?

glycerin

what type of sprinkler can be reinstalled once removed from a fitting?

Dry Pendant

What does RTI stand for?

Response Time Index

how many spare sprinkler heads are to be supplied on a system with 896 sprinklers?

12

Where are Quick response heads not permitted to be installed ?

Extra hazard occupancies

Sidewall sprinklers can only be mounted Horizontally

False

Maximum Ceiling temperature for intermediate temperature classification is?

150f

what part of a solder link is temperature sensitive?

Solder

What does RTI Measure?

Thermal Sensitivity & how fast the heat responsive element operates

"Skipping" is not permitted as per NFPA 13.

False

what distance around a heater should a high temperature head be installed?

7'

If a sprinkler is located behind a heater 7'6" , what is the lowest temp. Rating that can be used?

ordinary

what sprinkler is used to get coverage under a roll up door?

horizontal sidewall

what is the maximum distance from ceiling to deflector in obstructed construction?

22"

what is the maximum spacing between standard sidewall sprinklers in light hazard?

14ft

what is the minimum distance between standard sidewall sprinklers?

6'

distance below ceiling to deflector for a standard sidewall sprinkler?

4"-6"

how many sprinklers are required to be in a head box for a system with 1300 sprinklers.

24

what is the frame arm colour to indicate a high temperature sprinkler?

blue

What issue of NFPA would I refer to when installing a sprinkler system in a private dwelling?

NFPA 13D

What NFPA would I refer to for high rise sprinkler systems?

Nfpa 13

What NFPA would I refer to for Low rise residential sprinkler systems?

NFPA 13R

the maximum area coverage of any sprinkler shall not exceed

400sqft

Maximum spacing for Light hazard

15'

Maximum spacing for Ordinary hazard

15'

Maximum spacing for Extra hazard

12'

Maximum coverage for Light hazard

225ft^2

Maximum coverage for ordinary hazard

130ft^2

Maximum coverage for extra hazard

100ft^2

Standard response - RTI

RTI > 80

Quick Response - RTI < 50

RTI < 50

What is the minimum load that hangers must support?

Hangers must support 5 times the weight of the water-filled pipe plus 250 lbs.

Can sprinkler pipe support other non-system components?

No, sprinkler piping/hangers shall not support non-system components.

What is the maximum unsupported length of steel pipe if system pressure is less than 100 psi?

24 inches.

What is the maximum unsupported length of copper pipe if system pressure is less than 100 psi?

12 inches.

What is the maximum unsupported length of steel pipe if system pressure exceeds 100 psi?

12 inches.

What is the maximum unsupported length of copper pipe if system pressure exceeds 100 psi?

6 inches.