
9
INSTALLATION HORIZONTAL PUMPS
PIPING THE PUMP
All anged connections to the pump should be full
at face with full contact gaskets. Raised face anges
or partial contact gaskets should not be used as
excessive strains can be applied to the pump anges
upon tightening. The pump has been designed with all
necessary strength factors for long, reliable service life.
However, due to the composite construction, care must
be taken during installation to avoid unnecessary pipe
strain. If severe piping strains are to be encountered,
exible connections are recommended in the suction
and discharge pipe lines. When lined piping is used,
ange alignment should be carefully checked. Spacer ring
gaskets are recommended to assure parallel alignment of
pipe and pump anges. The following ange bolt torque
values should be used:
All piping must be supported independently of the
pump. The piping should always line up naturally with
the pump anges. Never draw the piping to the suction
or discharge anges of the pump. Outside installations
should be properly compensated for changes in ambient
temperatures. Refer to pipe manufacturers standards for
proper installation. Omission of this could result in severe
strain transmitted to the pump anges.
The piping should be as short and direct as possible.
Avoid all unnecessary elbows, bends and ttings, as they
increase friction losses in the piping.
SUCTION PIPING
A) To minimize friction loss, the length of the suction
pipe (from process to pump inlet) should be as short
as possible. It is important that NPSH available to the
pump is greater than the NPSH required by the pump,
long suction runs greatly affect NPSH and should be
considered carefully. See pump performance curve for
NPSH requirements.
B) The diameter of the suction pipe should be as
large as the pump suction. If long suction runs are
encountered, the suction pipe diameter should be
increased to reduce the NPSH required.
C) Increasers or reducers, if used, should be eccentric
and installed with the eccentric side on the bottom of
the pipe to prevent air traps.
D) Elbows, ttings, valves or expansion joints should be
avoided at the suction ange. Allow a straight run
of at least 10 pipe diameters into the suction of the
pump.
E) If a valve is to be installed in the suction piping, only
full ow valves offering a minimum ow disturbance
should be used (ball, plug types). These valves should
be for shut-off only when the pump is not running,
and not for throttling or controlling ow. Centrifugal
pumps should never be throttled on the suction side.
F) Provisions for a suction pressure gauge should be
included.
DISCHARGE PIPING
A) Installation of a valve in the discharge line that can
be used as a block for inspection and maintenance is
recommended. It should be of a design to allow throttling
or ow control.
B) The diameter of the discharge pipe should be as large
or larger than the pump discharge.
C) Provision for a discharge pressure gauge should be
included.
ANCILLARY PIPING
A) The diameter of the ancillary or seal piping should be
large enough to meet the seal ushing requirements.
Typically this is 1/4-1/2 GPM at a pressure of 15-25 PSI
above the suction pressure for most mechanical seals.
Refer to pages 25 and 26 for recommended seal ush
ow rates and piping installations.
B) Where the ancillary piping is connected to the pump
only plastic ttings shall be used.
WARNING: FAILURE TO USE PLASTIC
FITTINGS MAY RESULT IN DAMAGE TO THE
PUMP.
C) Many modern ush systems incorporate electrically
actuated solenoid valves to conserve and control the
ow of ush liquids, ensure that the ush liquid is
owing to the seal before the pump is started.
D) On double seal arrangements with ush in and
ush out connections, ow control valves should be
installed in the ush out or downstream side. The
pump shaft should turn freely by hand after the piping
has been connected to the pump. This is to insure
that the piping has not caused binding in the pump. If
binding occurs, check for cause and correct.
The pump shaft should turn freely by hand after the piping
has been connected to the pump. This is to insure that
the piping has not caused binding in the pump. If binding
occurs, check for cause and correct.
Flange Size Bolt Torque
1-1/2” 9-12 ft-lbs (12.2-16.2 N-m)
2” 18-24 ft-lbs (24.4-32.5 N-m)
3” 23-30 ft-lbs (34-40.6 N-m)
4” 27-36 ft-lbs (36.6-48.8 N-m)
6” & Larger 35-50 ft-lbs (47.5-67.8 N-m)