•
Two rings of packing
Diaphragm seal maintenance
The diaphragm seal normally does not require maintenance because the seal is non-contacting during
operation. If the seal is short-lived, it is due to one of four factors:
•
The pump was assembled improperly.
•
The suction head is higher than the repeller sealing capability.
•
The follower is not set properly.
•
The box is bound with foreign material.
Acceptable leaks
Slight leaks can be considered normal, but excessive dripping or spray indicates a problem. You can
usually obtain extra life by resetting the follower towards the diaphragm by 0.040 in (1 mm.) increments
and allowing the diaphragm to reseat during operation. If this is not successful, replace the diaphragm
and follower (if scored).
Stuffing box cover
The stuffing box cover used with the dynamic seal option is equipped with two lantern ring connections:
•
One repeller flush connection
•
One repeller drain connection
The lantern ring connection can be used to inject flush liquid or grease when required on specific appli-
cations, but not when using a diaphragm seal.
NOTICE:
Do not flush the stuffing box through the lantern ring connection when a diaphragm static seal
is used. This may cause premature seal failure.
Drain tap
The drain tap allows you to drain the liquid that remains in the repeller chamber upon pump shutdown.
Consider removing this liquid before you service the pump in order to prevent it from hardening, or pro-
tect the pump during freezing weather. The flush tap allows injection of water or steam directly into the
repeller chamber near the base of the repeller vanes.
Injected liquid
During operation, the injected liquid can prevent de-watering of stock or similar problems. On shutdown,
it can be used in conjunction with the drain in order to flush the chamber of solids or potentially harmful
liquids.
6.4 Disassembly
6.4.1 Disassembly precautions
WARNING:
•
Failure to disconnect and lock out driver power may result in serious physical injury or
death. Always disconnect and lock out power to the driver before performing any installa-
tion or maintenance tasks.
6.4 Disassembly
Models 3180, 3181, 3185, and 3186 Installation, Operation, and Maintenance Manual
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