Titanium compabloc plate exchanger in FCCU main column head service
Titanium compabloc plate exchanger in FCCU main column head service
(OP)
These exchangers cool the main column head gas by water sea
Alfa Laval proposed 3 Titanium welded plate exchangers for this service (Compablock Titanium grade 1 plates , T=80-100 °C, 3000 ppm h2s, 1500 ppm Nh3, <10 ppm CN, 0 ppm Cl).
API 571 par 5.1.3.2 advise for hydriding risk (NACE MR175 par. 4.2.1.4 too) in hydrocarbons side.
What's your experiences about it? Is the grade 1 the best grade for this service?
We actualy use Saf 2507 tube exchanger but we have seen crevice corrosion under gasket in floating head area in sea water side.
What material do you think better?
tx Aldo Cigna
Alfa Laval proposed 3 Titanium welded plate exchangers for this service (Compablock Titanium grade 1 plates , T=80-100 °C, 3000 ppm h2s, 1500 ppm Nh3, <10 ppm CN, 0 ppm Cl).
API 571 par 5.1.3.2 advise for hydriding risk (NACE MR175 par. 4.2.1.4 too) in hydrocarbons side.
What's your experiences about it? Is the grade 1 the best grade for this service?
We actualy use Saf 2507 tube exchanger but we have seen crevice corrosion under gasket in floating head area in sea water side.
What material do you think better?
tx Aldo Cigna





RE: Titanium compabloc plate exchanger in FCCU main column head service
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RE: Titanium compabloc plate exchanger in FCCU main column head service
Often there is now a very good solution. I believe in the Titanium welded plate exchanger propose but in this case there is the hydrading risk, if > 80°C
RE: Titanium compabloc plate exchanger in FCCU main column head service
today there is no doubt that at this level of corrosion resistance the superferritic alloys are the most economical.
My only thought about your use of plate exchangers concerns your cooling water, is it clean enough? You will have very small passages and no way to clean these out.
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Titanium compabloc plate exchanger in FCCU main column head service
Now we are evaluating the propose to use a new titanium welded plate exchanger (compabloc) in FCCU Head main column service.
I haven't any experiences about this new type. Alfa laval tell easy cleaning operation.
After unbolting the four heavy closure steel plates, it is possible clean all flow channels by high pressure water.
The flow area is bigger than in traditional exchangers (ND max 3/4")
In any case, I think that, in our case, the cleanig is no a true problem because we have three different exchangers lines but only two are sufficient.
I believe that the most important problem is the corrosion problem because the plate thickness is lower than in the tube case and is no easy to blind it
The titanium plate choise is a very expansive one. I would be sure.