In simple words, "SOLE-Max & SOLE-Min process values in the system is defined as HH/LL alarm value which is safe operating limit or SIS activation value."
"OWEL is the process value which will be measured between 50% of high/low alarm valve and of high-high/low-low alarm value ( SIS activation value ...

sys1 wrote: 14 Oct 2026, 06:45 Trays efficiency gets reasonably affected by the leveling.
And that disturbance in the level happens during operations as well due to thermal expansion of tray deck.

Particularly relatedto when having valve trays as bubble cap ones are prone to leakage even when moderately out of level.

This one reference seems to be straight forward and can be used any time instead of having an excel sheet in hand.


I am not sure if you know about the application from CCPS which you may download and use to assess Process Safety Incident.
It has got chemical database within supported qith a ...

Actually, it is not only the levelling but the sagging of the complete tray deck which is needed to be checked.
In addition the outlet weir levelness is important to check as well.

Check Lees' Loss Prevention in the Process Industries (Edited by Sam Mannan).

There are many different roles including:
1. Operations Engineer
2. Process Engineer
3. Process Control Engineer
4. Process Automation Engineer
5. Process Safety Engineer
6. HSE Engineer
7. Business Analyst
8. Production Planning Engineer

Does it necessary to have a software to engineer the temporary repairs?
I do not think any of our site engineers are using any engineering tools, spare some spreadsheets, if they might be having them.

Why are there anyway different types of welding?
Just need to know the basics only, means to understand the reasons of having those many, their shortcomings and advantages.
A chemical engineer on the round to the workshops.

Was thinking the same. Means job role is entirely different but yes the background science behind all these responsibilities may stand the same, be a chemical engineer.

The user interface is good. Loved the way it first makes the search and suggest you to go through earlier discussions. Then enabling to post. Tried posting, do that all very well. But this forum and few others than professional ones are not listed in the app.
But overall, a good one to start ...