Roth DWT Installation Manual
3
Lubricating & Hydraulic Oil Storage and Dispensing
Section 1 - The Roth Industries EcoDWT plus 3 Double Wall Tank
Construction
1. The Roth EcoDWT plus 3 storage tank is a double wall tank (DWT) providing both primary
and secondary containment tanks for
#2 fuel oil, diesel fuel, bio-fuels up to B20, and
both new and used automotive motor oils.
It is engineered to be the finest fuel storage
tank available for residential and light commercial use and one that will provide decades of
trouble free service.
2. As the name indicates, it is the ecologically sound choice for fuel oil storage, additionally
providing three distinct advantages ( the “plus 3”) over common single wall tanks: superior
fire protection over most single wall tanks by keeping the oil cooler and therefore less stress
on the tank seams, as shown in UL fire tests; the combination of a steel tank encasing
a plastic tank protects the fuel oil products, particularly bio-fuels, with the best light and
diffusion barrier; when properly secured in place, the double wall tank provides excellent
safe fuel oil storage in flood prone locations, a record established in over forty years of use.
3. The primary containment tank is made of high density polyethylene resin and is formed
by a rigorously controlled blow molding process. Polyethylene is a material that combines
flexibility with very high resistance to the corrosive effects of both acids and water. Acids are
found in all fuel oil products and are, in combination with water, the primary cause of steel
tank failure. Water is commonly found in fuel oil storage tanks from water vapor, introduced
by the vent piping primarily during the emptying of the tank, condensing inside the tank
as the air cools when in contact with the cooler oil. The use of polyethylene, with its high
resistance to corrosion, essentially eliminates the foremost reason for failure.
