Graham Corporation
C) Draining Before Start-Up
CAUTION: DO NOT START THE PUMP WITH THE CASING FULL OF LIQUID.
A Liquid Ring Pump should not be started with the casing full of liquid. Damage to the
impeller(s) or the shaft will result. The normal liquid level should be no higher than the shaft
centerline. The pump may be started with a low liquid level as long as a supply of service
liquid is available immediately after start-up.
2.8 Shaft Seal Coolant Piping Arrangement
A) Series 1 Design
Refer to the Operating Instructions in Section 3 for guidance on running the system.
The Series 1 design incorporates a packed gland shaft sealing arrangement. On size 30000
pumps, the packings are cooled and lubricated internally therefore no piping is required. On
pumps size 40000 and larger, the glands are fitted with lantern rings and have separate
connections for the fluid. A clean source of fluid should be provided at 5 to 10 PSI (0.3 to 0.7
bar) above the discharge pressure. The discharge from the second gland can be piped to a
separator or a drain. (See Fig. 2)
Note that some Series 1 pumps are fitted with special mechanical seals. Refer to the seal
manufacturer’s instructions for cooling of these seals.
11
Shaft Seal Coolant Inlet at 7 to 10
PSI Above the Discharge Pressure
Figure 2
Pump Suction
Pump Discharge
Regulating
Valve
Sight Flow
Indicator
Regulating
Valve
Pressure
Gauge
Shaft Seal
Coolant Outlet
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