//FIREPUMPS
DIESEL
UNITS
Chassis
All units are built on a rugged steel chassis which, with the
exception of the very small air cooled units, have legs to support
the main frame clear of the floor in order to facilitate cleaning
under the unit, draining engine oil, and handling by forklift.
The rigid legs are welded into the chassis side and crossmembers
and have generous mounting feet as platforms for resilient pads
or grouting.
All units except the very small or extra large are built to
a pump suction centre height of 500mm. Back pullout type pumps
are used with spacer couplings so that pumps can be serviced
without disturbing engine or pump mountings.
Guards
All coupling and belt guards are manufactured from 1.6mm sheet
steel and are mounted so that they can be removed with the minimum
of tools and fuss.
Battery Chargers
Two approved battery chargers are provided, one for each battery
set. These constant voltage 10 amp chargers have a controlled
output of approximately half a volt, from zero to maximum current.
They are fully protected against reverse polarity and short
circuits, totally enclosed in their own individual steel cabinets,
and are easily exchanged should this ever be necessary. They
are connected to the 230V A.C. supply via the N/C contacts of
their individual micro switches mounted on the control panel.
By depressing these switches the chargers can be disconnected,
allowing checking of battery voltages.
Battery Pack
Each unit is supplied with a battery pack consisting of either
two or four 12V batteries mounted in a steel frame with a non-conductive
cover, all treated with an epoxy acid resistant coating.
Cooling
Water cooled units are fitted with our own "Secura"
by-pass heat exchanger. The cooling water is normally fed through
the heat exchangers from the main pump discharge via a line
strainer, control valve, flow indicator and Maric valve.
In an emergency this route can be by-passed by opening the emergency
cooling valve, and shunting water directly to the heat exchanger.
The main cooling valve may then be closed and repairs carried
out on the pipework without shutting down the unit - the flow
indicator acting as a non return valve and preventing a back
flow into the area being serviced.
Heat
Exchanger
The "Secura" heat exchanger is designed to allow cold
water into the engine water jacket
according to the disposition of the engine thermostat, and has
two main advantages:
(1)Should a moderately sized leak occur in the cooling system
the water jacket will be constantly
"topped up" by the heat exchanger.
(2)Should the vee belts fail and the engine water circulating
pump stop, there is sufficient head on the cold water from the
heat exchanger to enable a diminished flow to enter the engine
block and provide sufficient cooling to enable the engine to
keep running.
(3)Radiator cooling also available.
(4)Closed
circuit heat exchanges also available
Emergency
Starter
The engine can be started at any time by:
(1)The manual start button on the panel.
(2)The emergency hand start lever.
The emergency start lever is arranged to provide manual engagement
of the starter pinion, while simultaneously engaging two manual
switches wired directly from the batteries to the starter motor
field windings, this system completely bypasses the control
cabinet, and all normal starter switches and solenoids.
Control
Cabinet
The control cabinet is floor mounted with two lockable front
opening panels, so that it can be situated against a wall, or
with its back to the pump unit, thus giving the maximum amount
of scope in laying out the pump house.
The instruments are housed in the upper panel which gives very
good visibility and because it opens to over 90° from the
cabinet, access to the instrument wiring is excellent. The instruments
are arranged in three main groups, giving concentrated information
on pump performance, engine performance and battery condition,
while L.E.D.'s on the controller face show the units mode, i.e.
-"STANDBY" - "ISOLATED" - "CRANKING"
or - "RUNNING".
Engine revs are displayed by a digital tachometer. Up to a maximum
of ten pressure switches can be provided, with their individual
isolate relays and isolated lights.
The cabinets are supported off the floor by galvanized steel
supports and are connected to the pump units by a flexible conduit
and a 16-pin aeronautical quality, mechanically restrained plug
for the wiring, and two nylon pipes of different sizes - to
avoid wrong connection - for the pressure gauges. The wiring
and pressure gauge lead outs can be fed into the left hand or
right hand side of the cabinet.
Fuel
Tank
The fuel tanks are cylindrical in shape, and are constructed
from stainless steel 5mm steel plate ends. A generous 228mm
dia. inspection hatch, magnetic drive colour coded fuel gauge,
sludge sump, fuel valve, drain valve and two 1" B.S.P.
filler and vent sockets are provided. These tanks may be platform
or wall mounted.
Electric Pump Units
Electric motor driven pumping units are also regularly required
on sprinkler contracts. Such units require the same reliability
and safety as diesel engined sets. All electric units built
by Galbraith Engineering Limited are tested and checked to the
same standards as the diesel units.
Where a submersible pump is to be used special monitoring equipment
is installed in the control cabinet to regularly check the condition
of the motor windings, both for insulation resistance and continuity.
Starter contacts and overloads must be rated 30% greater than
required by the motor.
