Insulated longitudinal baffle

[vesselguy]

I have worked on F-shells with fixed and removable longitudinal baffle but have never seen an insulated baffle. Can anyone explain or direct me to a site with a drawing or photo to show me how this “insulating” feature is done? Is it by an air gap between two welded plate spaced 3mm apart or something like that? The curious mind wants to know.

Thanks.

 

[srfish]

Hi,

There is a substance called Ryton that can be used to spray on a long baffle to insulate it. The Ryton is made by Phillips Petroleum.

The double long baffle is best used in a 2 tube pass u-tube. There the double wide baffle can be in the bend lane and you do not lose any tubes in the tube count.

 

[vesselguy]

Am I to understand that it is typical to spray on an insulating coating as the mean to make an insulated baffle? On a F-shell with fixed baffle and a removable U-tube bundle, I can see the sprayed-on coating could be damaged during extraction/insertion.

 

[srfish]

I don't believe it is typical or used extensively but it is an option. If you want more information you can contact Conoco Phillips. There you can evaluate the hardness of the final product. There is a company in Bartlesville OK that can spray the coating onto the long baffle. They can be reached at (918) 337-0651. Tulsa Heat Exchanger companys have used their service.

 

[rmw]

I have seen an insulating longitudinal baffle between DSH sections and drains cooler sections of large power plant feed water heaters made by taking diamond plant and laying 2 plates face to face so that the diamond hatch patterns face each other creating an air layer. When that is sealed up, the air sandwiched and trapped between the plates acts as an insulator. When it comes to heat transfer materials, air is a pretty good insulator overall.

It was plugged welded at a specified intervals to keep it from popping the plates apart when the air inbetween got hot.

Could that be what you are seeking?