installation &
operating instructions
Design Envelope 4300 & 4380 Vertical
In-line pumping unit with ivs drive
9
important:
All Design Envelope 4300 pumps contain a tapped hole in
the motor bracket above the discharge flange (see Fig. fig.
1.14) for draining the well. Pipe this drain hole to a floor drain
to avoid overflow of the cavity caused by collecting chilled
water condensate or from seal failure.
1.2.3 pump piping – general
Never connect a pump to piping, unless extra care is taken
to measure and align the piping flanges well. Always start
piping from pump.
Use as few bends as possible and preferably long radius
elbows.
Do not use flexible connectors on the suction or discharge of
a vertical in-line pump, unless the pump is rigidly mounted to
a foundation.
Ensure piping exerts no strain on pump as this could distort
the casing causing breakage or early failure due to pump
misalignment.
All connecting pipe flanges must be square to the pipe work
and parallel to the pump flanges.
Suction and discharge pipes may be increased or decreased
at pump nozzle to suit pump capacity and particular condi-
tions of installation. Use eccentric reducers on suction con-
nection with flat side uppermost.
Layout the suction line with a continual rise towards the pump
without high points, thus eliminating possibility of air pockets
that may prevent the pump from operating eectively.
A strainer of three or four times the area of the suction pipe,
installed in the suction line, will prevent the entrance of
foreign materials into the pump. V" (3 mm) diameter perfora-
tions in the strainer is typical.
In open systems, test suction line for air leaks before starting;
this becomes essential with long suction line or static lift.
Install, at the pump suction, a straight pipe of a length
equivalent to four or six times its diameter; this becomes es-
sential when handling liquids above 120°f (49°c). Armstrong
suction guides may be used in place of the straight pipe run
and in-line strainer.
Install an isolation valve in both suction and discharge lines
on flooded suction application; these valves are used primar-
ily to isolate the pump for inspection or repair.
Install a non-slam non-return check valve in discharge line
between pump and isolation valve to protect pump from
excessive back pressure and to prevent water running back
through the pump in case of driver failure on open systems.
1.2.4 alignment
Design Envelope 4300 units are accurately aligned
at the factory prior to being shipped and do not
need re-aligning when installed.
Alignment on a Design Envelope 4300 unit may be verified by
assuring an equal and parallel gap between coupling halves
on both sides of the coupling.
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