Dear All,
I want to submit to you a question that coming from FIELD.
During COMMISSIONING activities the Licensor and subsequently the client have requested a complete table with all the data for HOT TORQUING related only a REACTOR and HEATER area.
This area, in operation condition, working with high temperature, but normal pressure.
For this project, has been followed the standard tightening during construction/erection activities.

In my experience the torquing activities are made when the flange connection are cold and the standard data for tightening take in to account the eventually expansion/relaxation when the temperature of the material raise up and come back to cold status.

The step for this activities normally are :
1 – Torquing during erection
2 – make in operation the line
3 – re check all the flange connection when the line come back in cold status.

Also I want to highlight that in my experience and also in accordance with some standard from very important chemical company, HOT TORQUING shall be avoided.

What is your opinion about the above request? it is correct?
On internet and standard specification I have not found any type of data for HOT TORQUING.
Existing some standard data for HOT TORQUING ?
We have not made any HOT TORQUING, but maybe someone has some experience about it?
Thanks a lot for the cooperation
Best regards