Split Mechanical Seals

Split Mechanical Seals FSA Knowledge Series

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Abstract ▪

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This Fluid Sealing Association Knowledge Series training presentation introduces split seals and their advantages.

Split Mechanical Seals

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Split pusher seal designs have gained in popularity over the years as a sealing option in many applications. They are becoming more common in large equipment handling non-toxic fluids.

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There are many advantages to the use of split seals. The only disadvantage comes in the form of higher initial leakage rates versus non-split designs.

Split Mechanical Seals - Advantages Split seal advantages include:

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They are generally hydraulically balanced and provide maximum interchangeability in pumps and other equipment, like mixers, without equipment modification.

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They eliminate sleeve wear and minimize power consumption when compared to compression packing.

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They have a wide operating window ranging from vacuum to positive pressure.

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They can be installed without sleeve or shaft replacement, even if the pump was previously packed.

Split Mechanical Seals - Advantages Split seal advantages include (continued):

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Large pumps and other rotating equipment benefit from the split seals by saving equipment teardown for initial installation or seal replacement eliminating the related down time.

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The bolt circles or slots in the gland are designed to fit most popular pumps and flush ports are provided in the gland for ease of connection to the appropriate piping plan.

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Split seals springs are typically located outside the process fluid which prevents clogging.

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They eliminate excessive leakages that typically lead to bearing failures and corrosion issues.

Split Mechanical Seals - Advantages Split seal advantages include (continued):

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They also reduce maintenance and operating costs for large pumps with reduced flush requirements and repair costs.

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While the initial cost of split seals can be slightly higher than non-split component or cartridge seals, the overall life cycle costs are less.

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The savings are realized from not having to remove the pump or realign the equipment for seal repair.

Split Mechanical Seals - Description

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Seal is axially split.

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Provided in multiple components or preassembled rotary and stationary halves.

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Single and dual arrangements available.

Split Mechanical Seals - Summary

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Does not require disassembly of the pump to install

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Reduces down time

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May leak more than a conventional seal

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