AESSEAL API Plan 21

Product recirculation from discharge through flow control orifice and heat exchanger to seal chamber

Description

1. Improves pressure margin over vapour pressure.

2. Improves temperature margin to meet secondary sealing element limits, to reduce coking or polymerizing and to improve lubricity.

3. Self venting plan.

4. Provides sufficient pressure difference to allow proper flow rate.

Use

1. For high temperature applications e.g. hot water application (temperature > 80ºC), hot hydrocarbons etc.

2. In hot non-polymerizing fluids.