Is it true that Plan 53A seal support system is only compatible with double mechanical seals, not with single mechanical seals?

Yes, this conclusion is completely correct.

The main reasons are summarized as follows:
1. Structural incompatibility: A single mechanical seal has only one seal cavity, which is in direct contact with the process medium, leaving no independent space to contain the pressurized barrier fluid required by Plan 53A.
2. Functional mismatch: The core of Plan 53A is to inject a barrier fluid with pressure higher than the process medium into the seal cavity. If applied to a single seal, the barrier fluid would flow directly into the pump, contaminating the process medium or causing process disruption.
3. Standard specification: API 682 clearly stipulates that Plan 53 series are specifically designed for double mechanical seals (Arrangement 3).

Dandong Runhe Seal Co.,Ltd.
Add：No.70-43, Wenqing Road, Instrument and Apparatus Park, Dandong, Liaoning, China.
Tel.：86-415-5711666
Mob: 0086-18541507008
Email：export@rhseal.com 
Wechat ID: RunheSeal
Web：www.rhseal.com

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