GRISWOLD PUMP COMPANY Installation Page 15
Installation, Operation and Maintenance Manual
Griswold Model 811
Griswold Pump Company Installation Page 17
which is inserted into the oil sump in the bearing frame.
In some instances, mechanical seals are flushed from the pump discharge through a heat
exchanger. Cooling water is to be supplied to the “water” side of the heat exchanger.
Flushing
Flushing is usually associated with the shaft sealing and is application specific.
Mechanical seals are usually flushed to prevent localized heating at the seal faces. Flush may be
with a bypass line from the pump discharge to the gland flush connection or from the gland flush
connection to the pump suction. If the pumpage contains solids or other contaminants the seal
may be flushed from an external clear liquid source, usually into the seal gland flush connection.
If packing is used and flushing is required, such as when the pumpage contains minor amounts of
solids, which would wear the packing and sleeve, a clean water flush is introduced into the
lantern ring connection on the stuffing box cover. This injects water into the lantern ring area
between the rings of packing to prevent the intrusion of solids. It’s helpful to have a pressure
gauge, needle control valve and flow indication device in this flush line to monitor flushing
liquid.
If the pump is in a suction lift application, the stuffing box pressure may be less than atmospheric
pressure in which case pressurized water should be supplied to the lantern ring connection to
effect a water seal. If the pumpage is clean, this may be a bypass line from the discharge of the
pump. If the pumpage contains solids, external water injection may be necessary as noted above.
Prior to pump start-up, all cooling and flushing lines (as applicable) must be installed and
functional.
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