Troubleshooting; Possible Problems / Suggested Solutions - EBARA 80?25 Installation Operation & Maintenance

EBARA Multi-Stage Dry Vacuum Pumps

6.0 Troubleshooting

6.1

Possible Problems / Suggested Solutions

Trouble
Pump has shut
down, and the water
failure light is on.
Coolers are clean,
but the pump will not
restart, or starts and
then stops due to
overcurrent.
Gear lubricating fluid
is cloudy or opaque.
Gear lubricating fluid
darkens the sight
glass.
930601-P
Table 1:
Possible Causes
Cooling water flow rate
is below 3-4 lpm.
Possible blockage.
Exhaust valve stuck.
Pump tolerances
clogged with
particulate.
Exhaust is clogged.
Lubricating fluid has
become contaminated
with water.
Nitrogen flow across
the labyrinth seal is
blocked.
Nitrogen flow is too high
(>18 lpm) across the
labyrinth seals, causing
a venturi effect.
Solutions
Check the inlet flow and pressure for
proper settings. If necessary,
increase cooling water flow rate to 5-8
lpm. Check the inlet screen at the
bottom of the flow meter for blockage.
Restart the pump.
Examine the exhaust check valve and
clean if necessary, or replace the
exhaust valve.
Remove material by vacuuming out
the pump while manually rotating the
rotor in reverse at the end cap.
Clean the exhaust line.
Reset the over-current switch and
restart the pump.
Change the lubricating fluid.
Check the Nitrogen pressure and flow
across the seals.
Reduce the flow to <18 lpm.
Troubleshooting
42