Eng
lish
(US)
6
Fig. 2
Anchor bolt installation
4.6 Securing base plate
• After the concrete pad has been poured and set, lower the
pump base plate over the anchor bolts and rest it on loose
adjustment wedges or shims placed near each anchor bolt and
at intervals not to exceed 24" along each side. Shims or
wedges must be placed to raise the bottom of the base 3/4" to
1 - 1/4" above the pad, allowing clearance for grout. Level the
pump shaft, flanges, and base plate using a spirit level,
adjusting the wedges or shims, as required.
• Check to make sure that the piping can be aligned to the pump
flanges without placing any strain on either flange.
• After pump alignment has been established (LF), put nuts on
foundation bolts and tighten them just enough to keep the unit
base plate from moving. Construct a form or dam around the
concrete pad and pour grout in and around the pump base, as
shown in Fig. 2. Grout compensates for uneven foundation,
distributes the weight of the unit, and prevents shifting. Use an
approved, non shrinking grout (such as Embeco 636 by
Master Builders, Cleveland, Ohio or equivalent). Allow at least
24 hours for this grout to set before proceeding with piping
connections.
• After the grout has thoroughly hardened, check the foundation
bolts and tighten if necessary. Recheck the pump alignment
after the foundation bolts are secured.
• No alignment or grouting required for LCS pump.
4.7 Vertical mounting instructions
The PACO LCV Vertical Close Coupled pump need not be
grouted to its foundation, but should be anchored with 4 anchor
bolts set in concrete similar to the horizontal anchoring
arrangement Fig. 2.
4.8 Piping-general
• Do not use pump as a support for piping! Use pipe hangers or
other supports at proper intervals to provide complete piping
support near the pump.
• Both suction and discharge piping should be independently
supported and properly aligned so that no strain is transmitted
to the pump when flange bolts are tightened.
• Make sure piping is as straight as possible, avoiding
unnecessary bends and fittings. Where necessary, use 45 ° or
long-sweep 90 ° pipe fittings to decrease friction loss.
• Where flanged joints are used, make sure that inside
diameters properly match and mounting holes are aligned.
• Do not spring or force piping when making any connections!
4.9 Suction (inlet) piping
The sizing and installation of suction piping is particularly
important. It must be selected and installed in a manner that
minimizes pressure loss and permits sufficient liquid flow into the
pump during starting and operation. Many NPSH problems can
be traced directly to improper design of suction piping systems.
Observe the following precautions when installing suction piping:
Fig. 3
Inlet piping
• Suction piping should be as direct as possible, and ideally the
length should be at least ten times the pipe diameter. Short
suction piping can be the same diameter as the suction
opening. Longer piping should be one or two sizes larger
(depending on length), reducing to the diameter of the pump
suction opening.
• Use an eccentric reducer, with the eccentric side down Fig. 3
when reducing the pipe diameter to the diameter of suction
opening.
• At no point should suction piping be smaller in diameter than
the pump suction opening.
• Horizontal suction lines should follow an even gradient, if
possible. A gradual upward slope to the pump is
recommended for suction lift conditions, and a gradual
downward slope for positive suction head.
• Avoid any high points, such as pipe loops Fig. 4, that may
create air pockets and throttle the system or produce erratic
pumping.
• Install a valve in the suction line to isolate the pump during
shutdown and maintenance, and facilitate pump removal.
Where two or more pumps are connected to the same suction
line, install duplicate gate valves to isolate each pump from
the line.
• Gate valves should always be installed in positions that avoid
air pockets. Globe valves should not be used, particularly
when NPSH is critical.
• During pumping operation, valves on suction line must always
be at FULL OPEN.
• Properly sized pressure gauges can be installed in gauge taps
on pump suction and discharge nozzles. Gauges enable the
operator to monitor pump performance and determine that the
pump conforms to the parameters of the performance curve. If
cavitation, vapor binding, or other unstable operation occurs,
pressure gauges will indicate wide fluctuation in suction and
discharge pressures.
TM
0
5
47
75
2
512
Finished
grouting
.75 to 1.25
allowance for grout
Dam
Pipe sleeve
Washer
Base plate
Grout
Wedges or shims
left in place
Top foundation
leave rough clean
& wet down
LUG
TM
05
47
91
26
13
PA
CO Pumps
9
