Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Hydrocarbon decontamination best practice?

Hydrocarbon decontamination best practice?

Hydrocarbon decontamination best practice?


I would like to know what are common practices for decontamination of oil refinery plants in preparation for a turnaround.

Currently, our operations department uses regular steaming (175#) for most pipelines and vessels, however at times i've seen heavy oil systems steamed with detergent (simple green) as well as the use of Zyme for pyrophoric servies.

RE: Hydrocarbon decontamination best practice?

There is also an orange oil based 'Citra-Clean' product I have seen used.

Might be worth checking into.

Sometimes its possible to do all the right things and still get bad results

RE: Hydrocarbon decontamination best practice?

By definition, decontamination/inertization is a preparatory activity for unit turnarounds. Cleaning (incl. chemical cleaning) is a part of turnaround activities. Somehow we have mixed the two.

Steam is by far the cheapest fluid that can be used for decontamination. I doubt there will be any other more effective and cheaper way invented in future.

On the other side, the list of chemicals and fluids used for equipment cleaning is quite exhaustive. Apart from special detergents, light hydrocarbon fractions and hot water are commonly used for rinsing/removing of sludge and salt deposits accumulated inside the equipment. There are special chemicals for descaling of boilers, washing of turbine and compressor rotor blades, degreasing of fin-fan tubes etc.

Process Engineer, MSChE

RE: Hydrocarbon decontamination best practice?


Equipment steaming (for gas freeing)is a lengthy process for vessels with internal parts (towers with trays) so I was wondering what else can be done to accelerate the process for towers especially

RE: Hydrocarbon decontamination best practice?

The existing tried and true methods have been working just fine.
Any shortcut method you or anyone else comes up with you have to get it past all safety tests and agency approvals.
Then you have to ask yourself: will you allow your kids, your spouse or your mother to enter that vessel?

Sometimes its possible to do all the right things and still get bad results

RE: Hydrocarbon decontamination best practice?

I worked in refinery CDU's and I completely understand the issue you are talking about. On many occasions, I noticed the following:

1) The procedure for steaming of columns was really not developed, neither tested, nor improved based on actual field observations. Operators tend to introduce steam and then open all vents and drains, and keep it going that way forever until somebody says "hey, maybe we should stop and do the gas test". It is a terrible way of doing things but it happens almost everywhere. If this is the way Operations perform steaming in your refinery, maybe you can talk to the plant supervisor and try to put a decent steaming procedure as a start.

2) Draining of liquid inventory is the key for reduced timeline. Column bottoms, pump suction, draw off trays, and any other pocket where liquid can accumulate - you need to remove the inventory as much as possible. Otherwise it will take ages to vaporize all that liquid. The problem is usually with chimney trays where design leak rates are very small.

3) Look at the schematics of the isolated column and associated pipework and locate the vent and drain valves which should be open, and keep the other ones closed. Reduce the section volume as much as possible. If the section is very long, you won't see significant velocities at the pressurized end of the system. This further prolongs duration of steaming.

4) In some instances, it may be worthwhile to consider circulating hot water through the dirtiest section (column bottom/pump/hot preheat train/furnace/column) to get rid of sticky, viscous crude residue.

Process Engineer, MSChE

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close