Xylem P81875F Series HSC and HSC-S Centrifugal Pump User Manual
Page 8
8
Method 1 – Straight Edge Alignment for Standard Sleeve
Type Coupler with Black Rubber Insert (See Illustration 6A)
Before aligning the coupler, make sure there is at least
1
/
8
" end
clearance between the sleeve and the two coupler halves.
1. Check angular misalignment using a micrometer or caliper.
Measure from the outside of one flange to the outside of
the opposite flange at four points 90° apart. DO NOT
ROTATE COUPLER. Misalignment up to
1
/
64
" per inch of
coupler radius is permissible.
2. At four points 90° apart (DO NOT ROTATE COUPLER),
measure the parallel coupler misalignment by laying a
straight edge across one coupler half and measuring the
gap between the straight edge and opposite coupler half.
Up to a
1
/
64
" gap is permissible.
Method 2 – For Orange Hytrel Inserts, 3500 RPM
Operation, or All Other Coupler Types (See Illustration 6B)
a. Make sure each hub is secured to its respective shaft and
that all connecting and/or spacing elements are removed at
this time.
b. The gap between the coupling hubs is set by the manufac-
turer before the units are shipped. However, this dimension
should be checked. (Refer to the coupling manufacturer’s
specifications supplied with the unit.)
c. Scribe index lines on coupling halves as shown in
Illustration 5B.
d. Mount dial indicator on one hub as shown for parallel align-
ment. Set dial to zero.
e. Turn both coupling halves so that index lines remain
matched. Observe dial reading to see whether driver needs
adjustment (See paragraph i below).
f. Mount dial indicator on one hub as shown for angular align-
ment. Set dial to zero.
g. Turn both coupling halves so that index lines remain
matched. Observe dial reading to see whether driver needs
adjustment (See paragraph i below).
h. Assemble coupling. Tighten all bolts and set screw(s). It
may be necessary to repeat steps c through f for a final
check.
i. For single element couplings, a satisfactory parallel mis-
alignment is .004"T.I.R., while a satisfactory angular mis-
alignment is .004"T.I.R. per inch of radius R (See Figure 5B).
Final Alignment
Final alignment cannot be accomplished until the pump has
been operated initially for a sufficient length of time to attain
operating temperature. When normal operating temperature
has been attained, secure the pump to re-check alignment
and compensate for temperature accordingly. See Alignment
Section.
OPTIONAL Alignment Procedure
If desired, the pump and motor feet can be doweled to the
base after final alignment is complete. This should not be
done until the unit has been run for a sufficient length of time
and alignment is within the tolerance. See Doweling Section.
NOTE: Pump may have been doweled to base at factory.
STRAIGHT EDGE
FEELER GAGE
FEELER GAGE
ANGULAR ALIGNMENT
PARALLEL ALIGNMENT
CORRECT ALIGNMENT
STRAIGHT EDGE
INCORRECT ALIGNMENT
Illustration 6A – Checking Alignment (Method 1)
Illustration 6B – Checking Alignment (Method 2)
DIAL
INDICATOR
INDEX LINE
R
RESILIENT
SEPARATOR
DIAL
INDICATOR
PARALLEL
ALIGNMENT
ANGULAR
ALIGNMENT
WARNING: Rotating Components Hazard
Do not operate pump without all guards in place.
Failure to follow these instructions could result in serious
personal injury or death and property damage.
CAUTION: Extreme Temperature and/or
Flying Debris Hazard
Eye protection and gloves required. Failure to follow these
instructions could result in property damage and/or moder-
ate personal injury.