Alignment Troubleshooting - ITT 3610 i-FRAME Manual

Symptom
The mechanical
seal is leaking ex-
cessively.
The motor re-
quires excessive
power.

7.2 Alignment troubleshooting

Symptom
Horizontal (side-to-side) align-
ment cannot be obtained (angu-
lar or parallel).
Vertical (top-to-bottom) align-
ment cannot be obtained (angu-
lar or parallel).
3610 i-FRAME API 610 11th Ed/ISO 13709 2nd Ed, API Type BB1 Single-Stage, Axially-Split, Between-Bearing IOM
Cause
The foundation is not rigid.
The bearings are worn.
The suction or discharge piping
is not anchored or properly
supported.
The pump is cavitating.
The packing gland is not ad-
justed properly.
The stuffing box is not packed
properly.
The mechanical seal parts are
worn.
The mechanical seal is over-
heating.
The shaft or shaft sleeve is
scored.
The discharge head has drop-
ped below the rated point and
is pumping too much liquid.
The liquid is heavier than ex-
pected.
The stuffing-box packing is too
tight.
Rotating parts are rubbing
against each other.
The impeller clearance is too
tight.
Cause
The driver feet are bolt-
bound.
The baseplate is not
leveled properly and is
probably twisted.
The baseplate is not
leveled properly and is
probably bowed.
Remedy
Tighten the hold-down bolts of the
pump and motor. Make sure the
baseplate is properly grouted
without voids or air pockets.
Replace the bearings.
Anchor the suction or discharge
piping as necessary according to
recommendations in the Hydraul-
ic Institute Standards Manual.
Locate and correct the system
problem.
Replace the worn parts.
Check the lubrication and cooling
lines.
Install a throttle valve. If this does
not help, then trim the impeller di-
ameter. If this does not help, then
contact your ITT representative.
Check the specific gravity and
viscosity.
Readjust the packing. If the pack-
ing is worn, then replace the
packing.
Check the parts that are wearing
for proper clearances.
Adjust the impeller clearance.
Remedy
Loosen the pump's hold-down bolts, and slide the pump
and driver until you achieve horizontal alignment.
1. Determine which corners of the baseplate are
high or low.
2. Remove or add shims at the appropriate cor-
ners.
3. Realign the pump and driver.
1. Determine if the center of the baseplate should
be raised or lowered.
2. Level screws equally at the center of the base-
plate.
3. Realign the pump and driver.
7.2 Alignment troubleshooting
115