Graham Corporation
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B) Series 2 Design
The Series 2 pumps use single mechanical seals for shaft sealing. A shaft seal tubing assembly
(or harness) is normally provided to flush/cool the seals with service liquid from the liquid ring.
(See Figure 3)
Size 90000 pumps have shaft seals that are flushed internally and no harness is required.
Standard Configuration
Figure 3
Note: If the service liquid contains contaminates, they will be forced to the outside of the liquid
ring by centrifugal force and then into the seal flush harness and mechanical seals. If there is a
concern that these contaminates may harm the mechanical seals, then each seal must be flushed
externally with 0.25 to 0.5 GPM (0.06 to 0.1 m
3
/hr) of clean, filtered liquid at 10 PSI (0.7 bar)
above the discharge pressure. To flush externally, remove the shaft seal harness and plug the
unused connection.
The size 30000 pump will require a seal coolant supply at the driven end only as the non-driven
end mechanical seal is cooled by the incoming service liquid. No drain piping is needed as both
seals drain internally. (See Figure 4)
Pump
Dischar
e
Figure 4 - Size 30000 Optional Configuration
Pump
Suction
Sight Flow
Indicator or
Rotameter
Shut-Off
Valve
Regulating
Valve
Harness
Size 40000 through 80000 Size 30000
Harness
Shaft Seal Coolant
Inlet at 10 PSI Above
the Dischar
e Pressure
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