Goulds Pumps 3180-86 - IOM - Manual (Page 69)

Repeller seal maintenance
Some services might require a flush if solids have built up on the repeller. The unit contains a flush tap for
that purpose. The unit also contains a drain tap in order to drain the repeller chamber if there is a danger
that the unit might freeze.
Graphite packing maintenance
Graphite packing requires the same maintenance as any other packing. When adjustments can no longer be
made with the gland because it contacts the box face, perform these maintenance tasks:
• Shut down the pump.
• Relieve the pressure.
• Add another ring of packing to the box.
If the lantern ring connection is used but no longer lines up with the flush port, you need to clean and
repack the stuffing box. The repacking procedure is the same as the procedure outlined in the
Commissioning, Startup, Operation, and Shutdown chapter except this is the arrangement:
• One ring of packing
• The lantern ring
• 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
applications, 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
protect 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.
Maintenance
Models 3180, 3181, 3185, and 3186 Installation, Operation, and Maintenance Manual 67