Differences between a cartridge mechanical seal and a component mechanical seal

Structure and design

The cartridge mechanical seal is designed as a preassembled unit that includes all the necessary components, such as rings, springs, and seals, within a single cartridge. The component mechanical seal, on the other hand, consists of 2 separate elements, the filla part and the rotating part, which must be manually assembled around the shaft.

Installation

In terms of installation, mechanical cartridge seals are much easier to fit. Since they are preassembled, they can be inserted directly onto the pump or shaft without requiring complex adjustments, thus reducing the risk of errors. Component seals, on the other hand, require a different procedure because the two main components must be assembled by hand then adjusting the working dimension, increasing the risk of error and the time required to complete the installation.

Maintenance

Maintenance of cartridge mechanical seals is also much easier than that of component seals. In case of interventions, the entire cartridge can be easily removed and replaced, without the need to disassemble the pump or shaft. This significantly reduces downtime. In contrast, maintenance of component seals is more complex, as it requires the removal and reassembly of individual elements, increasing the time required and the risk of making mistakes.

Costs

From an economic point of view, cartridge mechanical seals tend to be more expensive than component seals. Their preassembled design and ease of installation justify a higher initial cost. However, reduced maintenance costs and less downtime can make this solution more cost-effective in the long run. On the other hand, component mechanical seals have a lower initial cost, but installation and maintenance costs can be higher due to the time and expertise required.

Applications

Cartridge mechanical seals are particularly suitable for applications requiring rapid installation and replacement, such as in industrial plants where downtime must be minimized. They are ideal for critical high-intensity applications. Component mechanical seals, on the other hand, find use in less complex settings or where initial costs are a key factor. They are often used in less critical installations where maintenance requirements are infrequent.

Reliability

In terms of reliability, mechanical cartridge seals offer a significant advantage because the pre-assembled design reduces the risk of human error during installation. This results in greater operational reliability and a lower likelihood of premature failure. In contrast, the reliability of component seals depends heavily on the skill of the installer and the proper adjustment of each component. Poor installation can compromise proper operation and seal life.