Flowserve MJ Slurry - Manual (Page 19)

MJ SLURRY USER INSTRUCTIONS ENGLISH 71569294 - 02/08
Page 19 of 42
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4.6 Grouting
The purpose of grouting is to provide rigid support to the
pump and driver by increasing the structural rigidity of
the top plate and making it an integral mass with the
foundation.
Clean the roughed foundation surface and build a
wooden form around the soleplate (see Fig. 1). For
initial grouting forms should be placed to isolate shims
and levelling nuts. The foundation surface should be
thoroughly saturated with water before grouting. A
typical mixture for grouting-in a pump base is composed
of one part pure Portland cement and two parts of clean
building sand with sufficient water to provide the proper
consistency. The grout should flow freely but not be so
wet as to cause the sand and cement to separate.
Thoroughly puddle the grout while pouring to eliminate
air pockets and low spots. Pour sufficient grouting to
ensure that the bottom surface of the soleplate is
completely submerged. Do not fill isolated areas
around the shims or levelling nuts. Once the grout has
set sufficiently, remove the wooden forms and finish off
the sides and top as desired. At the same time,
roughen the grout surface inside the soleplate. Cover
with wet burlap and allow the grout to cure for at least
40 hours.
After grouting has cured, shims and levelling nuts
should be removed or backed off. Tighten down
soleplate to the new grout to put bolts in tension and
ensure rigidity of structure. Install jam nuts and cut the
bolts to the desired length. Finish grouting isolated
areas.
4.7 Piping
Protective covers are fitted to the pipe
connections to prevent foreign bodies entering during
transportation and installation. Ensure that these
covers are removed from the pump before
connecting any pipes.
4.7.1 Suction and discharge pipework
In order to minimize friction losses and hydraulic
noise in the pipework it is good practice to choose
pipework that is one or two sizes larger than the
pump suction and discharge. Typically main
pipework velocities should not exceed 2 m/s (6 ft/sec)
suction and 3 m/s (9 ft/sec) on the discharge.
Take into account the available NPSH, which must
be higher than the required NPSH of the pump.
Never use the pump as a support for
piping.
Maximum forces and moments allowed on the pump
flanges vary with the pump size and type. To
minimize these forces and moments that may, if
excessive, cause misalignment, hot bearings, worn
couplings, vibration and the possible failure of the
pump casing, the following points should be strictly
followed:
• Prevent excessive external pipe load
• Never draw piping into place by applying force to
pump flange connections
• Do not mount expansion joints so that their force,
due to internal pressure, acts on the pump flange
The table in 4.7.2 summarizes the maximum forces
and moments allowed on M pump casings. Refer to
Flowserve for other configurations.
Ensure piping and fittings are flushed
before use.
Ensure piping for hazardous liquids is arranged
to allow pump flushing before removal of the pump.