coating a steel rector vessel

[offonoff]

Hi:

I chose the pharmaceutical forum because I am wanting to coat a carbon steel reactor vessel with a pharmaceutical grade lining. Enamel is an obvious solution. One thread here (thread116-73024) states that thermal expansion from room temp to 100C will cause the coating to flake. I do not believe this because enameled cooking vessels do not flake easily. Though the suggestion of electroplating does sound robust.

My conditions are 1500 psi and 100C.

Does any one have any experience with enameling a carbon steel vessel? specifically, sealing a flanged manhole on such a vessel.

Does anyone have any knowledge about electroplating a food or pharmaceutical grade coating on a vessel?

thanks.

 

[MedicineEng]

You want to do the coating by yourself?
I worked with enamel coated vessels in much more harsh production processes with temperature ranges up to 250C with no major problem, but the coating was done by the supplier of the vessel.

For enamel coating you need a furnace to melt the glass and bond it to the carbon steel body.
for waht I remembr form visiting some enamel coating plants the process is more or less this:

You have the carbon steel body, surface preparation and cleaning, spraying of enamel in the carbon steel (pretty much like spray painting in the cars), furnace at 800-1100C (I am talking by memoryso these temperature ranges might be wrong) for several hours with defined temperature ramps to avoid ar bubbles and cracks in teh enamel, removal form furnace and cooling down. Cleaning and Inspection.

If you are going to use it in a pharmacetical application, it will be very difficult to convince the auditors that you are able to do this in house without quality problems.

Hope that helps.
Regards