![]() ![]() One of the most popular features is vacuum testing-holding 1 in. The secondary containment may be made of an FRP combination, a high-density polyethylene or a polymer-all of which provide a durable outer layer resistant to corrosion and compatible with a wide range of petroleum and chemical products. "A jacketed design employs a UL 58 primary tank encapsulated by a nonmetallic layer of protection. I read about it in "Handbook of storage tank system", where it says this: RVAmeche Yes! You are right, that is exactly why I need to draw vacuum from the interstitial space. ![]() RE: Double wall tank - Interstitial layer doubts MJCronin (Mechanical) 8 May 19 16:02 Long story short.if you have an existing single wall tank and need a double wall.just buy a new double wall tank. Some areas require the nozzles (underground) to also be monitored, thus they need to be double wall and share the same interstitial space. If you need a double wall tank, you also have to think about the nozzles depending on the state and EPA regulations. Doing so would be seem to be awkward and clumsy (would you lift the existing tank from its saddle supports or base? how do you make sure it's centered? etc) There are no "add-ons" where you can attach an outer wall to the existing tank. Is this steel or fiberglass? Aboveground or underground? I don't think it'll really make a different as far as I know you have to buy a double wall tank from the manufacturer. There is no "interstitial layer", unless you mean some sort of coating in the interstitial space. I've never heard anyone refer to it as "the interstitial layer", primarily because the space between the inner and outer tank is the interstitial space. First of all the outer wall of the tank is typically just called the outer wall/outer tank. ![]()
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