Xylem 9100 Series Base Mounted Centrifugal Fire Pumps AC8585 REV.C - Manual (Page 15)

14. DOWELING
Dowel the pump and driving unit as follows:
a. Drill holes through diagonally opposite feet
and into the base. Holes must be of a
diameter 1/64 inch less than the diameter
of the dowel pins. Clean out the chips.
b. Ream the holes in feet and base to the
proper diameter for the pins (light push fit).
Clean out the chips.
c. Insert pins to be approximately flush with
feet.
15. SUCTION AND DISCHARGE PIPING
General
When installing the pump piping, be sure to
observe the following precautions:
Piping should always be run to the pump.
Do not move pump to pipe. This could make
final alignment impossible.
Both the suction and discharge piping should
be supported independently near the pump
and properly aligned, so that no strain is
transmitted to the pump when the flange bolts
are tightened. Use pipe hangers or other
supports at necessary intervals to provide
support. When expansion joints are used in
the piping system, they must be installed
beyond the piping supports closest to the
pump. Tie bolts should be used with
expansion joints to prevent pipe strain. Do not
install expansion joints next to the pump or in
any way that would cause a strain on the
pump resulting from system pressure
changes. It is usually advisable to increase
the size of both suction and discharge pipes
at the pump connections to decrease the loss
of head from friction.
Install piping as straight as possible, avoiding
unnecessary bends. Where necessary, use
45-degree or long sweep 90-degree fitting to
decrease friction losses.
Make sure that all piping joints are air-tight.
Where flanged joints are used, assure that
inside diameters match properly.
Remove burrs and sharp edges when making
up joints.
Do not “spring” piping when making any
connections.
Provide for pipe expansion when hot fluids
are to be pumped.
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