5
PIPING
Always install a section of straight pipe between the suction
side of the pump and first elbow or install a B&G Suction
Diffuser. This reduces turbulence of the suction by straighten-
ing out the flow of liquid before it enters the pump. The length
should be equal to five times the diameter of the pipe.
Be sure to eliminate any pipe-strain on the pump. Support the
suction and discharge pipes independently by use of pipe
hangers near the pump. Line up the piping so that the bolt-
holes in the pump flanges match the bolt-holes in the pipe
flanges. DO NOT ATTEMPT TO SPRING THE SUCTION OR
DISCHARGE LINES INTO POSITION. Coupling and bearing
wear will result if suction or discharge lines are forced into
position. The code for Pressure Piping (A.S.A.B. 31.1) lists
many types of supports available for various applications.
PIPING
As a rule, ordinary wire or band hangers are not adequate to
maintain alignment. It is very important to provide a strong,
rigid support for the suction and discharge lines.
Where considerable temperature changes are anticipated,
fittings for absorbing expansion should be installed in the
system in such a way as to avoid strain on the pump.
On an open-system with a suction-lift, use a foot-valve of
equal or greater area than the pump suction piping. Prevent
clogging by using a strainer at the suction inlet next to the
foot-valve. The strainer should have an area three times that of
the suction pipe with a mesh hole diameter of no less than
1
/
4
".
When using an isolation base, flexible piping should be used
on both the suction and discharge sides of the pump.
GROUTING
After the pump has been leveled, securely bolted to the floor,
and properly aligned, a good grade of non-shrinking grout
should be poured inside the pump base. To hold wedges or
shims in place, allow the grout to flow around them. (See
Figure 6B).
ROTATION
Pump rotation is clockwise when viewed from back of the
motor. An arrow is also located on the pump to show the
direction of rotation.
COUPLER ALIGNMENT
All alignment should be done by moving or shimming the
motor only. Adjustments in one direction may alter alignment
in another. Therefore, check alignment in all directions after a
correction is made.
Black rubber sleeves have different
horsepower load ratings then orange Hytrel sleeves, they
should not be interchanged.
Standard Sleeve Type Coupler with Black Rubber Sleeve
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 face of one flange to the outside
face of the opposite flange at four points 90° apart. Refer to
figure 7B. 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. Refer to figure 7A.
For Fine Alignment, Orange Hytrel Sleeves,
3500 RPM Operation, or All Other Coupler Types
Use a dial indicator when greater alignment accuracy is
required. Use the following alignment tolerances unless speci-
fied otherwise by the coupler manufacturer. On sleeve type
couplers make sure there is at least
1
/
8
" end clearance
between the sleeve and the two coupler halves.
1. To check angular misalignment, mount the dial indicator
base to one coupler half, or shaft, and position the dial indi-
cator button on the front or rear face of the opposite cou-
pler half. Set the dial to zero. Rotate both coupler halves
together
, making sure the indicator button always indi-
cates off the same spot. Misalignment values within 0.004"
TIR per inch of coupler radius are permissible.
2. To check parallel misalignment, mount the dial indicator
base to one coupler half, or shaft, and position the dial indi-
cator button on the outside diameter of the opposite cou-
pler half. Set the dial to zero. Rotate both coupler halves
together
, making sure the indicator button always indi-
cates off the same spot. Misalignment within 0.004" TIR is
permissible.
WARNING: ROTATING COMPONENT HAZARD
Do not operate pump without all guards in place.
Failure to follow these instructions could result in serious per-
sonal injury or death, or property damage.
WARNING: UNEXPECTED STARTUP HAZARD
Disconnect and lockout power before servicing.
Failure to follow these instructions could result in serious
personal injury or death, or property damage.
ANGULAR ALIGNMENT CHECK
FIGURE 7B
AMOUNT OF
PARALLEL
MISALIGNMENT
STRAIGHT EDGE
PARALLEL ALIGNMENT CHECK
FIGURE 7A
DISTANCES ACROSS
COUPLER FLANGES
SHOULD BE EQUAL
(CHECK 4 PLACES)
