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  • Writer's pictureKishor Pumps Mktg

Cartridge Seal versus Non-Cartridge Seal

Updated: May 4, 2020


1. Fitment

Cartridge Seal: May not fit into existing seal cavity & stuffing box dimensions easily.

Non-Cartridge Seal: Possible to accommodate.


2. Installation Errors

Cartridge Seal: Some of the parts come pre assembled, like the stationary components which come in a housing; and the rotating components, which come on a shaft-mounted sleeve and are sealed with an O-ring or elastomer. Because of this, installation errors are far less likely.

Non-Cartridge Seal: If just one component is installed incorrectly, the risk of seal failure will increase significantly. There are many components of the seal which need to be installed just right, including seal faces which must be properly seated on the shaft or seal housing, and sliding O-rings and elastomers over shaft shoulders, key ways, and other parts. A mistake installing any of these parts can result in misalignment, damage, and incorrect seal tension.


3. Spring Tension

Cartridge Seal: Cartridge mechanical seals, have preset spring tensions. A retaining device is used during the installation process to hold the rotating and stationary elements in alignment.

Non-Cartridge Seal: Variation may be there, depending on skills, as it depends on manual. Variation can be minimized by locking means like circlip or step etc


4. Installation Side

Cartridge Seal: Most cartridge mechanical seals cannot be installed on the wet side of a pump’s seal chamber, behind the impeller. These seals are generally incompatible with submersible pumps for a similar reason.

Cartridge seals can cost two to three times more than component seals.

Cartridge seals require less labor costs and less production lost from seal replacement.

Non-Cartridge Seal: Inside or outside.


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