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Some users don’t use sufficient length Anchor bolts, they use 7-10
cm bolts, the min required must be 15-50 cm depend on pump
power, weight…etc.
Also don’t try to lift the pump to match suction line using steel
sheets, or bars, or welding metal bars under the pump base, this
can lead to high vibration.
In all times must use Grout materials after finishing installation, this
will reduce any vibration.
1.8. Discharge Line
Many users use the pump discharge flange as guide to the
discharge line, without taking of consideration NFPA min. pipe
size, which can result of losing the getting water up to 150% of
listing capacity.
1.9. Relief Valve
Many users have three mistakes, using relief valve with electric
fire pump, which is bad design, because this mean using the relief
valve as pressure control valve, second mistake using the relief
valve with diesel engine while the pump shut-off pressure X1.22,
plus suction pressure is less than system working pressure, as this
mean spending money, you don’t need to spend, third installation
the relief valve in wrong location like on the system piping, which
lead that the relief valve will be most of the time subject to system
pressure which lead to losing the sensitivity of the valve, the right
location if after the pump discharge flange, and before the checkvalve.
1.10. Flow Meter
Many users don’t follow the NFPA20 guide of the location of flow
meter, or forget to add. Control valve after the flow meter to control
the flow to take the measurement at different flow/head points.
Preferred Arrangement for Measuring Fire Pump Water Flow with
Meter for Multiple Pumps and Water Supplies. Water is permitted
to discharge to a drain or to the fire pump water source.
BİLDİRİLER KİTABI TÜYAK
PROCEEDINGS BOOK 2009
1.11. Fuel Tank
Some client use galvanized steel, or copper pipes, which lead to
having abrasive partials in the fuel, and can affect the fuel pump
performance, only black steel pipes is recommended.
Also height of the fuel tank, few users either will put it under the
base, which lead to risk of entering air inside the fuel intake, or high
level than enough, which lead to fuel leakage out of the engine fuel
nozzle, NFPA state clearly the height of the tank.
Figure 11.
Figure 10. Figure 12.
1.12. Sensing Lines
One of the common mistakes using plastic, black steel or
galvanized steel pipes, while the only approve is brass, or stainless
steel tubes.
Other mistakes, mixing materials, like using brass tubes, with SS
fittings.
Common mistake putting valve between the discharge line, and
sensing line for service purpose, which some time lead to closing
the valve, and forget, which lead that the pump will not start.
Or using one line to supply the pressure to all pressure switches,
NFPA required one sensing line for each pump.
TÜYAK 2009
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