Mechanical Installation; Location; Foundation - Grundfos LS 500-300-490E Installation And Operating Instructions Manual

3. Mechanical installation

All installations should be performed by personnel
experienced with the placement, connection, and
alignment of pump equipment. The following
instructions are general in nature, and may not deal
with the specifics of your installation. Read these
instructions thoroughly before installing and operating
your LS pump. Successful operation depends on
careful attention to the procedures described in this
manual. Keep this instruction manual handy for future
use.

3.1 Location

• Locate the LS pump as close to the suction supply
as possible. Use the shortest and most direct
suction piping practical. Refer to section Suction
piping.
• Locate the pump below system level wherever
possible. This will facilitate priming, assure a
steady liquid flow, and provide a positive suction
head.
• Make sure sufficient NPSH (Net Positive Suction
Head) is provided at the suction end by
considering the pump's location in relation to the
entire system.
The correct pump location can provide a
safety pump operation. Available NPSH
must always. 0.5 - 1.0 m higher than the
required NPSH specified on the pump
performance curve.
• Always allow sufficient accessibility for
maintenance and inspection. Provide a clear
space with ample head room for use of a hoist
strong enough to lift the unit.
• Make sure a suitable power source is available for
the pump motor. Electrical characteristics should
match those specified on the motor data plate.
• Avoid pump exposure to sub-zero temperatures to
prevent pump liquid form freezing. If freezing
conditions exist during shutdown periods, see
sections Short duration shutdown and Extended
period shutdown for specific recommendations.
Related information
5.2 Suction piping
6.6 Short duration shutdown
6.7 Extended period shutdown

3.2 Foundation

LS pumps should be permanently installed on a firm,
concrete foundation mounting pad of sufficient size
(over 200 mm) to dampen any vibration and prevent
any deflection or misalignment. The pad may float on
springs or be a raised part of the equipment room
floor. The foundation should be poured without
interruption to 18-35 mm below the final pump
elevation. The top surface should be well scored or
8
grooved before the concrete sets to provide a suitable
bonding surface for the grout. Anchor bolts should be
set in pipe sleeves for positioning allowance, as
shown in fig. Anchor bolt installation. Allow enough
bolt length for grout, lower base plate flange, nuts and
washers. Allow the foundation to cure several days
before proceeding with pump installation.
For pump and motor directly connected,
the foundation weight is 3-5 times of pump
unit; for pump and diesel engine directly
connected, the foundation weight is 5-8
times of pump unit.
2
9
3
4
5
6
Anchor bolt installation
Pos. Description
1 Grout
2 Base plate
3 Finished grouting
4 Allowance for grout: 18-35 mm
5 Dam
6 Grout
Top of foundation leave rough clean & wet
7
down
8 Wedges or shims left in place
9 10 mm
1
8
7