Coal Tar Expoxy Performance
Coal Tar Expoxy Performance
(OP)
Hey Guys, I'm new to the forum.
Currently I'm working on a project where they have a floating bridge with pontoons across a salt water river in Guyana. We're currently using CTE to coat the pontoons (Carbon Steel) and are getting about 4-5 years out of it before the corrosion gets really bad again. Can anyone tell me past experiences they had with CTE Lifetimes in a similar environment?
Currently I'm working on a project where they have a floating bridge with pontoons across a salt water river in Guyana. We're currently using CTE to coat the pontoons (Carbon Steel) and are getting about 4-5 years out of it before the corrosion gets really bad again. Can anyone tell me past experiences they had with CTE Lifetimes in a similar environment?





RE: Coal Tar Expoxy Performance
RE: Coal Tar Expoxy Performance
We've been using this coating for 20 odd years now, my country usually lets cancer off the hook.
Do you know of any other coatings which can yield the same price and performance and CTE though?
RE: Coal Tar Expoxy Performance
RE: Coal Tar Expoxy Performance
RE: Coal Tar Expoxy Performance
RE: Coal Tar Expoxy Performance
the topside has some gunnels, manholes bolts, etc.
very cool forum btw. its nice to have some other Engineers to talk problems through. The engineers in my country are okay but not many are versed in proper corrosion mitigation because they aren't many large steel structures that arent galvanized or covered in my country. this bridge is the largest steel structure of its kind in my country. i think it was once the longest floating bridge in the world.
RE: Coal Tar Expoxy Performance
RE: Coal Tar Expoxy Performance
RE: Coal Tar Expoxy Performance
RE: Coal Tar Expoxy Performance
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Coal Tar Expoxy Performance
Manufacturer's Specs:
DFT: 400 microns
No of Coats: 2
Mostly Pitting Corrosion is occurring and localized to the top side of the pontoon.
Manufacturer Formula Not Changed.
RE: Coal Tar Expoxy Performance
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Coal Tar Expoxy Performance
RE: Coal Tar Expoxy Performance
@TomDOT you're referring to a top coat over the CTE or replacing it?
RE: Coal Tar Expoxy Performance
RE: Coal Tar Expoxy Performance
http://img6.imageshack.us/img6/2725/pict1790z.jpg
http://img856.imageshack.us/img856/9586/pict1791.j...
http://img801.imageshack.us/img801/4472/pict1784gw...
RE: Coal Tar Expoxy Performance
RE: Coal Tar Expoxy Performance
anyways I'll try to source a Zinc Rich Primer and Poly Urethane topcoat and add that to the existing paint system. has anyone ever used a paint system like that though?
RE: Coal Tar Expoxy Performance
RE: Coal Tar Expoxy Performance
I see four basic reasonable choices, depending on availability, cost of downtime, et cetera.:
1) CTE, plus a maintenance/touchup cycle after 1-2 years to fix the sloppy edges/corners.
2) CTE for the main coating system, plus some type of UV blocking topcoat. Check with your supplier for a recommended topcoat.
3) High-ratio inorganic zinc silicate primer alone. With a good IOZ and good surface prep, this works quite well.
4) IOZ, epoxy midcoat, urethane topcoat.
IOZ is more application sensitive (ie, you can get away with sloppier surface prep with CTE) and you have to be sure you're getting a good IOZ like the original NASA formulation.
RE: Coal Tar Expoxy Performance
RE: Coal Tar Expoxy Performance
can someone clarify?
RE: Coal Tar Expoxy Performance
http://imageshack.us/photo/my-images/51/tablea5.pn...
RE: Coal Tar Expoxy Performance
RE: Coal Tar Expoxy Performance
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Coal Tar Expoxy Performance
Listen to the people on the forum, they want to help you. First, you need someone real professional help for this project, use the help as advised, then spend some time to learn what you still don't know for your own benefit and for working similar jobs. This forum is only indication for what you are suppose to learn, is not a substitute for your experience.