NFPA 24 (TFM10) - Fire Sprinkler Underground
Test Review Latest Update 2025-2026 55
Questions and 100% Verified Correct Answers
Guaranteed A+
"D" in Hydrostatic Testing Allowance Formula - CORRECT ANSWER: Nominal diameter
of pipe (inches)
"L" in Hydrostatic Testing Allowance Formula - CORRECT ANSWER: Testing allowance
(makeup water) [gph (gallon/hour) ]
"P" in Hydrostatic Testing Allowance Formula - CORRECT ANSWER: Average test
pressure during hydrostatic test (gauge psi)
"S" in Hydrostatic Testing Allowance Formula - CORRECT ANSWER: Length of pipe
tested (feet)
200 psi or 50 psi above system working pressure @ 2 hour hold - CORRECT ANSWER:
What pressure do piping and attached appurtenances need to hydrostatically tested at?
32 in - 40 in (800 mm to 1000 mm) - CORRECT ANSWER: Height at which post
indicator valves are to be set above final grade.
6 in - CORRECT ANSWER: The connection from the hydrant to the main shall not be
less than _____.
6 in (150 mm) - CORRECT ANSWER: For mains that supply fire hydrants, pipe size
shall not be less than _____.
, Authority Having Jurisdiction (AHJ) - CORRECT ANSWER: May be a federal, state,
local, or other regional department or individual such as a fire chief; fire marshal; chief
of a fire prevention bureau, labor department, or health department; building official'
electrical inspector; or others having statutory authority.
AWWA C900 - CORRECT ANSWER: Standard for PVC pressure pipe and fittings, 4 in
through 63 in
Check Valve - CORRECT ANSWER: A valve that allows flow in one direction only.
control valve - CORRECT ANSWER: A listed _____ _____ shall be installed in each
hydrant connection.
Dry Barrel Hydrant (Frostproof Hydrant) - CORRECT ANSWER: A type of hydrant with
the main control valve below the frost line between the footpiece and the barrel.
Flow Hydrant - CORRECT ANSWER: The hydrant that is used for the flow and flow
measurement of water during a flow test.
Flow Test - CORRECT ANSWER: A test performed by the flow and measurement of
water from one hydrant and the static and residual pressures from an adjacent hydrant
for the purpose of determining the available water supply at that location.
Flushing Test - CORRECT ANSWER: A test of a piping system using high velocity flows
to remove debris from the piping system prior to it being placed in service.
Hydrostatic Test - CORRECT ANSWER: A test of a closed piping system and its
attached appurtenances consisting of subjecting the piping to an increased internal
pressure for a specified duration to verify system integrity and system leakage rates.
Test Review Latest Update 2025-2026 55
Questions and 100% Verified Correct Answers
Guaranteed A+
"D" in Hydrostatic Testing Allowance Formula - CORRECT ANSWER: Nominal diameter
of pipe (inches)
"L" in Hydrostatic Testing Allowance Formula - CORRECT ANSWER: Testing allowance
(makeup water) [gph (gallon/hour) ]
"P" in Hydrostatic Testing Allowance Formula - CORRECT ANSWER: Average test
pressure during hydrostatic test (gauge psi)
"S" in Hydrostatic Testing Allowance Formula - CORRECT ANSWER: Length of pipe
tested (feet)
200 psi or 50 psi above system working pressure @ 2 hour hold - CORRECT ANSWER:
What pressure do piping and attached appurtenances need to hydrostatically tested at?
32 in - 40 in (800 mm to 1000 mm) - CORRECT ANSWER: Height at which post
indicator valves are to be set above final grade.
6 in - CORRECT ANSWER: The connection from the hydrant to the main shall not be
less than _____.
6 in (150 mm) - CORRECT ANSWER: For mains that supply fire hydrants, pipe size
shall not be less than _____.
, Authority Having Jurisdiction (AHJ) - CORRECT ANSWER: May be a federal, state,
local, or other regional department or individual such as a fire chief; fire marshal; chief
of a fire prevention bureau, labor department, or health department; building official'
electrical inspector; or others having statutory authority.
AWWA C900 - CORRECT ANSWER: Standard for PVC pressure pipe and fittings, 4 in
through 63 in
Check Valve - CORRECT ANSWER: A valve that allows flow in one direction only.
control valve - CORRECT ANSWER: A listed _____ _____ shall be installed in each
hydrant connection.
Dry Barrel Hydrant (Frostproof Hydrant) - CORRECT ANSWER: A type of hydrant with
the main control valve below the frost line between the footpiece and the barrel.
Flow Hydrant - CORRECT ANSWER: The hydrant that is used for the flow and flow
measurement of water during a flow test.
Flow Test - CORRECT ANSWER: A test performed by the flow and measurement of
water from one hydrant and the static and residual pressures from an adjacent hydrant
for the purpose of determining the available water supply at that location.
Flushing Test - CORRECT ANSWER: A test of a piping system using high velocity flows
to remove debris from the piping system prior to it being placed in service.
Hydrostatic Test - CORRECT ANSWER: A test of a closed piping system and its
attached appurtenances consisting of subjecting the piping to an increased internal
pressure for a specified duration to verify system integrity and system leakage rates.
