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A 4-inch schedule 40 main is routed parallel in-between two beams and requires a trapeze hanger. The main is 2 ft. from one beam and 8.5 ft. from the other for a total span of 10.5 ft. What is the smallest schedule 10 pipe diameter capable of supporting this main as a trapeze hanger?
b. 2-1/2 inch
c. 3 inch
d. 3-1/2 inch
Solution | Posted 10/24/19
Use Alpert's Correlation to determine the maximum temperature (in degress Celsius) of a ceiling jet at a point 1.3 meters (horizontally) from a 1.8 MW fire which burns within a 2.2 m tall room. Assume an ambient temperature of 22 deg C.
a. 25 deg C
b. 78 deg C
c. 326 deg C
d. 384 deg C
Solution | Posted 10/22/19
The activation time (in seconds) of a standard response (RTI of 85 m^1/2s^1/2), Ordinary Temperature (65 deg C) heat detector within a room that has an initial temperature of 22 deg C and exposed to a ceiling plume at 78 deg C traveling at 2.3 m/s is most nearly?
a. 10 s
b. 36 s
c. 54 s
d. 82 s
Solution | Posted 10/18/19
If Element A is a 45-minute interior door, B is a corridor, C is a 2-hour rated stair, and D is a non-rated exterior door, which element identified would be considered an exit?
a. 45-minute Interior Door A
b. Corridor B
c. 2-hour Rated Stair
d. Non-Rated Exterior Door
Solution | Posted 10/15/19
A manufacturing facility's campus water supply is fed from a 125-foot tall open atmosphere water tank. A site fire pump is located 5 feet above grade and is flowing at its rated capacity of 35 psi at 1000 gpm with 18 psi loss in the total pipe network, what will the pressure be at the pump discharge if the discharge pipe is 4 inches in diameter?
a. 48 psi
b. 56 psi
c. 64 psi
d. 71 psi
Solution | Posted 10/08/19
A high-rise building is to use a pressurized tank (half air-half water) to supply automatic sprinkler systems. If hydraulic calculations determine that 55 psi is required to supply the sprinkler system, what tank pressure is required?
a. 55 psi
b. 95 psi
c. 125 psi
d. 140 psi
Solution | Posted 10/07/19
A fire department connection may be installed by any of the following arrangements except:
a. Between the supply control valve and the system control valves for multiple sprinkler systems
b. Attached to underground system piping, between the supply control valve (at the main tap) and the system control valves (inside the building)
c. Attached to main pipe on a system (on the system side of the system control valve) for a single wet system
d. Attached to the main service between the utility tap and the entry into a fire pump room
Solution | Posted 10/02/19
A project site is connected to a water tank through an equivalent 650 feet of 6-inch schedule 10 pipe (c-factor of 140). If the water tank is 165 feet above the project site, the fire flow available at the project site is most nearly:
a. 1,300 gpm
b. 2,100 gpm
c. 2,400 gpm
d. 8,700 gpm
Solution | Posted 10/01/19
An equivalency is being developed for a building with unprotected steel W24x76 columns. Determine the fire endurance time (in minutes) for one of these columns W24x76 columns have an approximate flange and web thickness of 0.68 inches, and a flange width of 8.99 inches.
a. 4.3 minutes
b. 7.8 minutes
c. 9.7 minutes
d. 55.3 minutes
Solution | Posted 09/27/19
Which of the following is typically not considered obstructed construction for fire sprinkler design?
a. concrete tees with solid members 5 inch wide and 2 ft tall
b. heavy timber construction with 4 inch solid wood beams
c. beam and girder construction with 6 inch steel beams 6 ft apart
d. panel construction with panels under 300 sqft
Solution | Posted 09/25/19
A stair is 59 inches wide, with a handrail on one side with a centerline of 1.5 inches from the edge of the stair. The other side of the stair is a wall. For the purposes of calculating a specific flow, what is the effective width of the stair?
a. 47 in.
b. 48 in.
c. 53 in.
d. 59 in.
Solution | Posted 09/23/19
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