Service manual

18
E.7 QUENCHED SHAFT SEALS
When quenching fluid is hot water or steam, apply to seal at least 30 minutes prior to pump
start-up to insure seal area is thoroughly heated. When steam is used, it should be saturated at
about 4 to 7 psi gage. When quench fluid is ambient temperature nitrogen, it can be applied
just prior to pump start-up.
E.8 PUMPED LIQUIDS
NEVER operate a pump with water. Pump is designed for liquids having general characteristics
of oil. In closed or recirculating systems, check liquid level in tank before and after start-up to
be sure it is within operating limits. If initial liquid level is low, or if it drops as system fills during
start-up or pumping operations, add sufficient clean liquid to tank to bring liquid to its normal
operating level. Only use liquid recommended or approved for use with equipment. Regular
checks should be made on condition of liquid. In closed systems, follow supplier’s
recommendations for maintaining liquid and establishing when liquid is to be changed. Be sure
temperature is controlled so liquid can not fall below its minimum allowable viscosity which
occurs at its maximum operating temperature. Also, insure that maximum viscosity at cold
start-up does not cause pump inlet pressure to fall below its minimum required value.
CAUTION ATTENTION
• NEVER operate a pump without liquid in it!
• Operate only on liquids approved for use with pump.
WARNING
If not appropriately collected, packing or seal leakage may make floor slippery
and/or expose personnel to hazardous fluids.
E.9 PUMP AND SEAL CHAMBER PRIMING
Pump Priming:
Prime pump before initial start-up by pouring some of liquid to be pumped into fill point in
system or directly into pump suction port. Rotate pump slowly by hand until rotors or gears
(pumping elements) are wet and suction line is as full of liquid as possible. See Figure 12.
CAUTION
- Dry-starting a pump is likely to cause damage to pumping elements.
Pr
iming
Po
int
Figure 12 – Priming Pump Using Priming Port