I think Bruce Curry is being overcautious, but you can't blame him for that, he has to cover himself. I can assure you though from experience that polyester resin will withstand all aspects of biodiesel production, including the acid-base process. Also I get the idea Mr Curry thinks you're going to use the glass matting too, not just the resin.
You do have a good point on how on earth to get it in the tank. I didn't realise access was such a problem. You could do it the way you suggest if you get the mix right, do tests first as suggested to make certain (a) it doesn't start hardening before you're done, and (b) that it doesn't not harden at all! Obviously (b) is worse than (a).
Best wishes Keith
I have lots of information regarding this subject - thanks to everyone's input I even have a reply from Bruce Curry from AOC corporation, but have not yet replied, since I am on my way out the door and have to do some homework to get him the answers he requested. I've posted it below The tanks were made for hydro at ambient temperature (water tanks) that used to hold alkily cleaning chemical for an auto auction and is no longer used. I picked them up for my bioprocessor to hopefully aid in containment of methanol evaporation as well as ease of production. (The reator is the Girl Mark fumeless) These three 82 gal tanks are taller then me with only four 1" openings. Regarding the correct components from what Keith and what I've read of what coating to (and run test), still has to be determined. I'm at odds on how I would coat the inside with just 1" opening (Openings: 1" open at top, two 1" opening midway (site tube) and one 1" at side bottom) This may not be possible. My thory of coating would be to pour the solution at the top and rotate the tank for full coverage. When full coating is applied, tip the tank (upside down and let the excess drain from the opening. let dry for undetermined amount of time and possible repeat Time temp. or the density of the solution questions still have to be answered and this will take some time. -Kevin FROM BRUCE: Will the refurbished tanks need to contain the sodium hydroxide and the potassium hydroxide and then later be used for biodiesel? If so, what is the concentration of the sodium hydroxide and the potassium hydroxide? What is the temperature? Are there organincs present with the sodium hydroxide and potassium hydroxide? Vipel F701 or F764 will handle the biodiesel but they will not be able to handle the sodium hydroxide or the potassium hydroxide. Premium corrosion resistant resins will be needed to contain sodium hydroxide or potassium hydroxide such as Vipel F010 but I need to know concentrations and temperatures before this can be confirmed. Unless you have had fiberglass lay up experience, it is likely that you will need to have someone come in to laminate for you. (Unless the NaOH and KOH concentrations are quite low and the temperature is ambient) These chemicals are quite aggressive to FRP and the laminate needs to made with minimal air bubbles and designed with an ASTM C 581 corrosion barrier. What is the roll of the zinc? Are you dissolving it? What is the concentration of the zinc? Is the zinc just metallic zinc? Bruce Curry AOC Corrosion Product Leader Phone 901-854-2871 ----- Original Message ----- From: "Jonathan Schearer" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, November 02, 2004 7:36 AM Subject: Re: [Biofuel] Fw: Biodiesel output to galvanized settling tankw/sitetube > > > Keith Addison <[EMAIL PROTECTED]> wrote: > Hi Jonathan > > >Kevin, I'm not sure if this relates to what you are doing, but I > >used the POR-15 that was recommended in the JTF site with great > >satisfaction. I coated the inside of 2-55 gallon tanks with half a > >pint. I used the clear paint and it formed a "shell-like" glaze > >that is solid like a rock. I made sure I read all the precautions > >on this stuff, use a respirator. High organics. I have not had > >anything in the tanks as of yet though. Hopefully I can get another > >stage completed over Thanksgiving. Just a suggestion. Jonathan > >Schearer. > > We'd used POR-15 previously, with great results, but not with > biodiesel. So before I uploaded the POR-15 link to our site I wrote > to them and asked about resistance to all things biodiesel, and they > assured me it was resistant. We haven't used it inside a processor, > but we have used it for a few other things that have had a lot of > contact with biodiesel, but washed biodiesel, thus not with the > processing chemicals. We had one report from someone who used it > inside a processor and said it started to peel off after awhile, > which he attributed to heat expansion and contraction, though it > didn't peel off the rusty bits. I wasn't sure if he'd prepared the > surface properly, which is really important. So I'm very interested > to hear how you get along with it. Please let us know. > > Regards > > Keith > > > I will share my findings. I am very optimistic and hope it works out well. The only frustrating thing on my part is how long it has been taking me to assemble the processor. Just to prepare the surface of the tanks for application took me 3 weeks. I had to do it in 3 stages...Clean surface with their cleaner, let dry, apply the metal etch, let dry, apply POR-15 let dry. When I received the package in the mail, I opened it and one of the first pieces of literature was labeled in large letters: DIRECTIONS FOR PEOPLE WHO DON'T READ DIRECTIONS. I had to laugh and then read them. Jonathan. > > >Kevin Shea wrote:Thanks Keith, > >Is the polyester resin coating something of a 'do-it-yourself' project? > >There is four 1" openings on each tank, so I should be able to pour the > >resin (or spray) and rotate each tank for full coverage.
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