Place a dial indicator on one shaft hub and rotate that hub 360°. Take readings from the face of
the other hub. Alignment is achieved when indicator does not deflect more than .002". See Fig.
13.
Figure 13: Dial indicator
2.7 Piping - general
1.
All piping must be supported independently of the pump. The piping should always "line-up" natu-
rally with the pump flanges. Never draw the piping into place by use of force at the flanged suc-
tion and discharge connections of the pump, as this may impose dangerous strains on the unit
and cause misalignment between pump and driver.
2.
The piping, both suction and discharge, should be as short and direct as possible. Avoid all un-
necessary elbows, bends, and fittings, as they increase the friction losses in the piping. The size
of pipe and fittings should be carefully selected and of sufficient size to keep the friction losses as
low as practical.
3.
Piping must not be connected to the pump until the grout has thoroughly hardened and the foun-
dation bolts, as well as driver and pump hold down bolts have been tightened.
4.
When handling liquids at elevated temperatures, it is suggested that expansion loops or joints be
properly installed in suction and/or discharge lines so that linear expansion of the piping will not
draw the pump out of alignment.
If such expansion loops or joints are not used, the forces and moments, due to thermal expan-
sion of the piping system, that can act upon the pump inlet and discharge flanges must be deter-
mined and must not exceed the limits permissible for the specific pump in question.
Such installations require extremely careful and precise attention to hot alignment procedures.
See
4.5 Alignment - final on page 32
5.
On units handling corrosives, the piping can be arranged so that corrosives can be flushed from
pump prior to opening unit for service. See Fig. 14. During operation, valves "1" and "3" would be
dosed, "2" and "4" open. Prior to dismantling, close valves "2" and, 4", open "1" and "3". Introduc-
ing water at valve "3" will allow water to flush pump and drain at valve "1 ".
2.7 Piping - general
3107 Installation, Operation and Maintenance Instructions
17
