In Charleston S.C. last time I talked to Marshal at Marsh Marine, cleaning tanks is his business, he gave me of an estimate of $1,000 per tank. I have two 12" access plates into the side of each of my tanks and they are as big as yours.I can carry 760 Gal of Diesel total between the two tanks. Most companies have a huge set up of racor filters on a hand truck out on the dock and they suck out the fuel and use a hose with your fuel to spray down the inside of your tanks. it is a all day process.  Marshal also installs access plates in tanks and does quite a good job at that. Most of the crud over the years that accumulated in the bottom of the tanks is thick enough to scrap out of the bottom of the tanks with a putty knife. .When they charge $100/hr and take 8 hours and you probably pay for the filters they use it is an easy $1,000 bucks. Can they get two big tanks in one day? I doubt it that is why he quoted estimate Per Tank. Bob KovachCharleston, S.C.

I cleaned fifty-year-old tanks in 2014. The key piece of advice that I received regarding tank cleaning was to shop-vac the bottom of my tank after washing down the sides and top. Without the shop vac I would not have gotten all the crud off the bottom. I didn't find that the crud was adhered to the tank so much as it was just heavy and content to stay in place. My procedure was: Remove all pump-able fuel. First by drawing from one tank and returning to the other, then, when no more fuel could be removed through the engine's fuel intake, I opened inspection ports and shop-vac'ed out the dregs, putting the "dregs" in a used oil disposal tank at the harbor. Next I washed the inside of my tank with water, washing down the top and sides, knocking off loose scale. It's good to have enough flow to move particulates that have lodged behind the joints where baffles meet the bottom of the tank, i.e, a "current" to carry particulates through the limber holes into the deepest corner of the tank. I put a whirly nozzel on the end of a wand that I made up from PEX, and with the wand I was able to stick the whirly nozzle through limber holes and rinse compartments that I could not otherwise reach. As wash-water and gunk accumulated I shop-vac'ed that deepest corner, dumping my wash-water in a fifty-five gallon oil-water separator. The separator was just a barrel with a lot of absorbent material inside and a drain in the bottom. Once the barrel was half-full or so, I could drain clean water off the bottom as necessary to make more room. I always drained clean water into a clean container where I would be able to detect any sheen. When I achieved no sheen I could dump it overside, when I failed, it went back into the top of the fuel water separator. At the end of the process I disposed of the absorbent material and the top 10-gallons or so of contaminated water at a hazardous waste facility. After getting it as clean as possible with the wash-down and shop-vac I used paper towels on a stick and wiped what I could reach, but my recollection is that the wash left it pretty clean. Finally I left inspection ports open until the tank was bone dry. Then I replaced all the inspection port gaskets and sewed it back up. This winter I intend to open inspection ports again and see how it looks four years later. On Mon, Dec 24, 2018 at 12:47 PM MY ALLEZ via Trawlers-and-Trawlering <trawlers@lists.trawlering.com> wrote: > > In Charleston S.C. last time I talked to Marshal at Marsh Marine, cleaning tanks is his business, he gave me of an estimate of $1,000 per tank. I have two 12" access plates into the side of each of my tanks and they are as big as yours.I can carry 760 Gal of Diesel total between the two tanks. > Most companies have a huge set up of racor filters on a hand truck out on the dock and they suck out the fuel and use a hose with your fuel to spray down the inside of your tanks. it is a all day process. > Marshal also installs access plates in tanks and does quite a good job at that. Most of the crud over the years that accumulated in the bottom of the tanks is thick enough to scrap out of the bottom of the tanks with a putty knife. .When they charge $100/hr and take 8 hours and you probably pay for the filters they use it is an easy $1,000 bucks. Can they get two big tanks in one day? I doubt it that is why he quoted estimate Per Tank. > Bob KovachCharleston, S.C. > _______________________________________________ > http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com > > To unsubscribe or modify your subscription options (get password, change email address, etc) go to: http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com > Trawlers & Trawlering and T&T are trademarks of Water World > Productions. Unauthorized use is prohibited.

Thanks for the info. On Mon, Dec 24, 2018 at 4:47 PM MY ALLEZ <my_allez@yahoo.com> wrote: > In Charleston S.C. last time I talked to Marshal at Marsh Marine, cleaning > tanks is his business, he gave me of an estimate of $1,000 per tank. I have > two 12" access plates into the side of each of my tanks and they are as big > as yours. > I can carry 760 Gal of Diesel total between the two tanks. > > Most companies have a huge set up of racor filters on a hand truck out on > the dock and they suck out the fuel and use a hose with your fuel to spray > down the inside of your tanks. it is a all day process. > > Marshal also installs access plates in tanks and does quite a good job at > that. Most of the crud over the years that accumulated in the bottom of the > tanks is thick enough to scrap out of the bottom of the tanks with a putty > knife. .When they charge $100/hr and take 8 hours and you probably pay for > the filters they use it is an easy $1,000 bucks. Can they get two big tanks > in one day? I doubt it that is why he quoted estimate Per Tank. > > Bob Kovach > Charleston, S.C. > -- Dickinson McGuire 443.994.0341