NFPA 25, CA Edition, Annex C - Possible Causes of Pump Troubles || Questions and 100% Verified Answers.
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NFPA 25, CA Edition, Annex C - Possible Causes Of
C.1 Is this Annex an extensive list of possible causes of fire pump troubles? correct answers No. This list is in addition to possible mechanical breakage that would be obvious on visual inspection
C.1 In case of multiple troubles, which troubles should be corrected first? correct answers Those ...
NFPA 25, CA Edition, Annex C - Possible Causes of Pump
Troubles || Questions and 100% Verified Answers.
C.1 Is this Annex an extensive list of possible causes of fire pump troubles? correct answers No.
This list is in addition to possible mechanical breakage that would be obvious on visual
inspection
C.1 In case of multiple troubles, which troubles should be corrected first? correct answers Those
troubles that can be checked easily should be corrected first or eliminated as possibilities
C.1.1 What are the symptoms of air being drawn into suction connection through leaks? correct
answers (1) No water discharge
(2) Discharge pressure not constant for same gpm
(3) Pump loses suction after starting
(4) Insufficient water discharge
(5) Discharge pressure too low for gpm discharge
C.1.1 What is the solution for air being drawn into suction connection through leaks? correct
answers Uncover suction pipe and locate and repair leak(s)
C.1.2 What are the symptoms of the suction connection being obstructed? correct answers (1) No
water discharge
(2) Pump loses suction after starting
(3) Insufficient water discharge
(4) Discharge pressure too low for gpm discharge
C.1.2 What is the solution for the suction connection being obstructed? correct answers Examine
suction intake, screen, and suction pipe, and remove obstruction. Repair or provide screens to
prevent recurrence
C.1.3 What are the symptoms of an air pocket in the suction pipe? correct answers (1) No water
discharge
(2) Pump loses suction after starting
(3) Insufficient water discharge
(4) Discharge pressure too low for gpm discharge
C.1.3 What is the solution for an air pocket in the suction pipe? correct answers Uncover suction
pipe and rearrange to eliminate pocket
C.1.4 What are the symptoms of a collapsed well or serious misalignment? correct answers (1)
Pump or driver overheats
(2) Pump unit will not start
(3) Pump is noisy or vibrates
(4) Too much power is required
, C.1.4 What is the solution for a collapsed well or serious misalignment? correct answers Consult
a reliable well drilling company and the pump manufacturer regarding recommended repairs
C.1.5 What are the symptoms of a stuffing box that is too tight or packing that was improperly
installed or is worn, defective, too tight, or incorrect type? correct answers (1) Excessive leakage
at stuffing box
(2) Pump or driver overheats
(3) Pump unit will not start
(4) Pump is noisy or vibrates
(5) Too much power is required
(6) Discharge pressure is not constant for same gpm
(7) Discharge pressure is too low for gpm discharge
C.1.5 What is the solution for a stuffing box that is too tight or packing that was improperly
installed or is worn, defective, too tight, or incorrect type? correct answers Loosen gland swing
bolts and remove stuffing box gland halves. Replace packing
C.1.6 What are the symptoms of an obstructed water seal or pipe to seal? correct answers (1)
Pump or driver overheats
(2) Discharge pressure is not constant for same gpm
(3) Pump loses suction after starting
(4) Insufficient water discharge
(5) Discharge pressure too low for gpm discharge
C.1.6 What is the solution for an obstructed water seal or pipe to seal? correct answers Loosen
gland swing bolt and remove stuffing box gland halves along with the water seal ring and
packing. Clean the water passage to and in the water seal ring. Replace water seal ring, packing
gland, and packing in accordance with manufacturer's instructions
C.1.7 What are the symptoms of an air leak into pump through stuffing boxes? correct answers
(1) Discharge pressure is not constant for same gpm
(2) Pump loses suction after starting
(3) Insufficient water discharge
(4) Discharge pressure too low for gpm discharge
C.1.7 What is the solution to an air leak into pump through stuffing boxes? correct answers Same
as if the water seal is obstructed. Loosen gland swing bolt and remove stuffing box gland halves
along with the water seal ring and packing. Clean the water passage to and in the water seal ring.
Replace water seal ring, packing gland, and packing in accordance with manufacturer's
instructions
C.1.8 What are the symptoms of an obstructed impeller? correct answers (1) Pump or driver
overheats
(2) No water discharge
(3) Pump is noisy or vibrates
(4) Too much power is required
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