Hydrocracking unit

[0707]

At the moment I am in the commissioning team of a Hydro cracking construction. We are still in the engineering phase of the project but sooner we will start with on site field erection. As I am not familiar with Hydro crackers what is forum advice on inspection matters of this kind of units? What we should look closer in the disciplines of rotating, static and piping equipment. I know the main corrosion mechanisms in hydro crackers is ABS (ammonium bisulphide corrosion) and high temperature corrosion related with hydrogen but I would like to know from forum experience inspection point of view at what matters the commissioning inspectors must take more attention.
Thanks in advance

luis

 

[RogerH]

0707
Being an operator/process guy on hydroprocessing units I would state everything that concerns the high pressure circuit and the warmer it is, the more important it is to insepct. Leaks are the most dangerous things on a high pressure HCU and there are no short cuts that can be allowed. Pressure integrity is crucial in high pressure units.
Cleanliness during construction also help a lot.
It is not fun to start up a unit only to find that one needs a shutdown for cleaning. Pre-comm cleaning is of course an important part but it wont help if the construction have done a poor job.
RH