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A set of questions and answers related to nfpa 24, a standard for the installation of private fire service mains. It covers various aspects of fire service main installation, including requirements for check valves, post indicator valves, hydrant placement, piping materials, and testing procedures. Useful for individuals studying fire safety and those involved in the installation and maintenance of fire service mains.
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This standard shall apply to ______ intended to carry water for fire service mains ✔✔Combined Service Mains
Working plans shall be submitted for approval to the _____ before any equipment is installed or remodeled. ✔✔AHJ
____ shall not be used ✔✔Pressure-Regulating devices
______ shall not be installed in the piping from the fire department connection to the fire service main ✔✔Control Valves
_____ shall be permitted in the system downstream of the fire department connection ✔✔Control Valves
When more than one water supply exists, a ___________ shall be installed in each connection ✔✔Check Valve
All check valves shall have a ________ installed upstream and downstream of the check valve. ✔✔Control Valve
A post indicator valve installed not less than____ from the building ✔✔40 ft
Where post indicator valves are used, they shall be set so that the top of each post is _______ above final grade ✔✔32-40 inches
Supervision of underground gate valves with roadway boxes shall ____________ ✔✔not be required
The connection from the hydrant to the main shall ___________ ✔✔not be less than 6 inches
Hydrants shall be located _________ from the buildings to be protected ✔✔not less than 40 ft
Hydrants shall be installed on __________ ✔✔flat stones, concrete slabs, or other approved material
Where private fire mains extend more than 10 ft into the building, they shall be ___________ ✔✔run in a covered trench
Thrust blocks shall be concrete of a mix not leaner than ______________ ✔✔1 part cement, 2 1/2 parts sand, and 5 parts stone
Rods shall be _____________ ✔✔not less than 5/8 in diameter
After installation, rods, nuts, bolts, washers, clamps, and other restraining devices _____________________ ✔✔shall be cleaned and thoroughly coated with a bituminous or other acceptable corrosion-retarding material
Pipe shall be _____________________ ✔✔restrained at the bottom of a hill and at any lateral or vertical turns
Bell ends shall be __________ ✔✔facing uphill
The flushing operation shall continue until water flow is verified to be ___________ ✔✔clear of debris
The installing contractor shall be responsible for _______________________ ✔✔completing and signing the contractors material and test certificates
All piping shall be hydrostatically tested at ____________________________ ✔✔gauge pressure of 200 psi or 50 psi above working pressure for 2 hours
Flow required to produce velocity of __________ in pipes ✔✔10 ft/sec
______________ do not include drain valves, check valves, or relief valves ✔✔control valves