1 reply to this topic

[omupei]

Hello,

I am seeking expert advice on the optimal location for a high-pressure switch/transmitter (PAH) that serves as a safety interlock for a distillation column, typically to cut the heat supply to the reboiler.

Based on my understanding, the two primary candidate locations are:

1. Column Top: In the overhead vapor line or on the reflux drum vapor space.
2. Column Bottom: Near the reboiler or in the bottom liquid line.

My questions are:

• Which location is generally preferred as the primary high-pressure trip point and why?
• How does the choice of location depend on the specific overpressure scenario we are protecting against? For example:
  • For a condenser failure or blocked vapor outlet, is a top-side sensor always superior for faster detection?
  • For a reboiler control failure (runaway heating) or blocked bottoms outlet, is a bottom-side sensor more effective?
• Is it a common design practice to install high-pressure interlocks at both the top and bottom of the column for comprehensive protection?
• What is the standard industry practice  for this specific safety-critical interlock?

Thank you for sharing your experience and insights.

[breizh]

Hi,

This paper is not going to address your specific questions; it intends to address Pressure controls on distillation columns.

It may help you.

Breizh