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Warman AH Expeller Arrangment

Expeller Seal Options for Slurry Pumps

This document summarizes different types of shaft seals used for slurry pumping applications: 1) Expeller seals can be made of metal or elastomer and provide the advantage of not requiring …

Expeller Seal — Metal

This seal is suitable for most slurry pumping applications. It provides the major advantage that no gland water is required. An expeller running in a ring of the same material and working with the vanes on the back face of the impeller ensures a leak proof seal. A grease lubricated packed gland with neck and lantern rings prevents leakage when the pump is stationary. The inlet head influences the effectiveness of the expeller seal and under normal operating conditions this type of seal is completely leak proof.

Expeller Seal — Elastomer

It provides the major advantage that no gland water is required. This type of seal is the same as the centrifugal metal seal apart from the following two items: the expeller ring in this seal is made of moulded elastomer and special synthetic rubber lip seals are used in place of the packed gland. This type of seal is generally used with pumps which are fitted with rubber liners.

Warman Dyna Seal

Unique to the Warman range of slurry pumps this unique seal eliminates sliding abrasion present in all other types of seal arrangements, whilst providing a positive seal. By changing certain components the seal can be retrofitted to existing pumps.

Gland Seal — Full Flow

With this type of seal, a conventional stuffing box replaces the expeller ring. A lantern restrictor and rings of packing are used. This sealing method is used when the inlet conditions are not suitable for the centrifugal expeller seal. Clean water at a pressure of at least 35 to 50 kPa above discharge pressure is required.

Gland Seal — Low Flow

This type of seal is utilised where only small quantities of gland water can be allowed to mix with and dilute the fluid being pumped. Clean water pressure of at least 35 to 50 kPa above discharge pressure is required.

Gland Seal — Ultra Low Flow

This type of seal is used where only very small quantities of gland water can be allowed to mix with and dilute the fluid being pumped. Clean water pressure of at least 35 to 50 kPa above discharge pressure is required.

Mechanical Seals

Mechanical seals, although not standard, can be supplied for the range of Warman pumps. These can be fitted on request and to clients’ specification. See separate brochure.