S12 FDNY Exam (Latest 2023/ 2024 Update) Questions and Verified Answers| 100% Correct| Grade A
S12 FDNY Exam (Latest 2023/ 2024 Update)
Questions and Verified Answers| 100%
Correct| Grade A
Q: a standard sprinkler has RTI of what?
Answer:
80
Q: a sprinkler system with open heads is called a?
Answer:
Deluge system
Q: the freezing point if ant freeze solutions is measured by what?
Answer:
hydrometer or refractometer
Q: local law 58/2009 requires sprinkler and stand pipe risers to be painted what color?
Answer:
yellow
Q: the distance for the hanger assembly to the center line of an upright sprinkler head should
be?
Answer:
3 inches
Q: the automatic ball drip is located where?
Answer:
Between lower check valve and fire department connection
Q: what is the purpose of a ball drip?
Answer:
to prevent freezing in the line
Q: the build up of foreign matter on a sprinkler head is called?
Answer:
loading
Q: when a sprinkler head opens it is said to?
Answer:
be fused
Q: the minimum air pressure inside a pressure tank is?
Answer:
75 psi
Q: a gravity tank should be atlas how many feet above the highest sprinkler heads it supplies?
Answer:
25 feet
Q: gauges are to be replaced every?
Answer:
5 years
Q: how many spare sprinkler heads are to be on hand when under 300 sprinklers?
Answer:
6
Q: how many spare spare sprinkler heads are to be on hand when there is 300 to 1000
sprinklers?
Answer:
12
Q: how many spare sprinkler heads are to be on hand when there is over 1000 sprinklers?
Answer:
24
Q: all sprinklers prior to what date shall be replaced?
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branch lines
Are connected to sprinkler heads
Cross mains or loop mains
Are directly connected to branch lines.
Feed mains
Are directly connected to cross mains or loop mains
Risers
Are able to supply feed mains or cross mains directly. The vertical supply pipes in a sprinkler system.
Standard wall steel pipe with diameters 1 inch and 1 1/4 inch are required to have hangers placed at.
Maximum of 12 feet apart. For all other pipe diameters the maximum distance is 15 feet.
The maximum hanger spacing for treated light wall steel pipe should not exceed.
12 feet apart.
The maximum hanger spacing for CPVC(plastic) pipe varies from.
A maximum of 5 ft 6 inches for 3/4 inch piping to a maximum 10 ft on center for 3 inch.
The distance for hanger assembly to the center line of an upright sprinkler head should not be less than.
3 inches.
For system operating at less than 100 psi the supported length between the end of the sprinkler head and the last hanger on the line should not exceed.
36 inches for 1 inch piping, 48 inches for 1 1/4 inch piping and 60 inches for piping 1 1/2 inch or larger.
For system at pressures of 100 psi or greater.
The hanger closest to the last sprinkler on the line shall be the type that prevents the upward movement of the piping.
The cumulative length of an unsupported arm over to a sprinkler head, sprinkler drop or sprinkler spring-up.
Should not exceed 24 inches for steel pipe and 12 inches for copper pipe.
System risers(vertical piping passing from floor to floor)shall be supported with riser clamps and hangers located.
Within 24 inches of the centerline of the riser. And should now exceed 25 feet between supports for risers.
Pipe diameter in inches.
Up to and including 4
Five, six and eight ten and twelve
3/8
1/2
5/8
Lateral braces shall be spaced at
Maximum of 40 feet on centers and are required on all piping 2 1/2 inch or larger. The distance from the last brace to the end of the pipe being placed shall not exceed 20 feet for system constructed under the 2008 building code.
longitudinal braces shall be spaced at maximum of
80 feet on centers and are to be provided on feed and cross mains.
To avoid damage to the piping passing through holes in platforms,walls, floors and foundations
At least 2 inches shall be provided around the piping.
Risers exceeding 3 feet in length
Shall be equipped with a four way brace with distances between braces not to exceed 25 feet.