API PLAN 76
A containment seal chamber drain for non-condensing leakage on arrangement 2 unpressurized seals with containment seals. Used if the
pumped fluid does not condense at ambient temperatures.
Features
- Avoids direct leakage of pumped media to the atmosphere and ensures almost no leakage from the outboard seal.
- The vapors are directed to the vapor collection system.
- This plan can be used with buffer gas (Plan 72) or without buffer gas (Plan 71).
- Set the pressure transmitter alarm to a pressure of 0.7 bar (10 PSI) so as to trigger an alarm when the pressure in the vapor collection system increases. This indicates inboard seal leakage.
- Ensure that the vent line is always open and an orifice is present to generate back pressure.
- Ensure a low point condensate drain.
- Check that the support to the harness piping is sufficient.
- Use a minimum 1/2" (13 mm) tubing for the CSV line and ensure that the pipeline rises continuously upwards.
- Do not use for condensing media.
Recommended Application
Remarks, Checkpoints :
- For non-condensing media – typically high vapor pressure flashing light hydrocarbons.
- For configurations utilizing an outboard containment seal – contacting or non-contacting type.
Recommended Application :
- For condensing media.
- For configurations utilizing an outboard containment seal – contacting or non-contacting type.
- Generally used in combination with a Plan 72 nitrogen purge.
