We have Vertical Double Wall Tanks, Cone Bottom
Double Wall Tanks and Open Top Double Wall Tanks.
Double Wall Tank Shapes:
Double Wall Poly tanks
in several shapes including vertical, open top and cone bottom.
Each of the shapes has different advantages. Vertical tanks
are the most cost efficient per gallon stored. Cone Bottom
tanks allow full drainage of the liquid.
Most of our
tanks up to 3,000 gallons in size are available made from more than one type of plastic.
Plastic Resin for Double Wall
Polyethylene is the most widely used plastic resin for
making poly storage tanks. It has a relatively low price and
good chemical compatibility. The polyethylene used is
HDPE. HDPE (High Density Polyethylene) is sometimes
conveniently but incorrectly referred to as HDLPE.
Polyethylene has a natural color that is a translucent milky
white. Tanks can be made in different colors.
For tanks with a capacity up to 3,000 gallons, we have
several opaque colors available including white for Sodium
Hypochlorite storage tanks.
Polypropylene is another
plastic we have available for making Double Wall storage
tanks. It comes in a milky translucent white color.
Polypropylene tanks cost a bit more than polyethylene tanks.
The Polypropylene Double Wall tanks are usually selected
when a special chemical compatibility is required or when
the temperature of the liquid in the tank needs to be above
130 F. Polyproyplene tanks can handle temperatures up
to slightly over 200 F.
Kynar PVDF is a specialized
resin that has terrific chemical compatibility. Kynar
Double Wall tanks can also deal with liquid tempertures up
to 300 F. for some storage tapplications. We
have other plastic resins available for tanks up to 3,000
gallons in capacity.
Specific Gravity Rating:
Most of our
Double Wall poly tanks are available in more than one
specific gravity rating. We have some tanks that are
rated for liquids with 1.5
specific gravity, 1.9 specific gravity or even 2.2 specific
ASTM Tank Standard:
Vertical and Open Top Dual Wall Polyethylene tanks have
standards set by ASTM D 1998. The ASTM standards were
not written to apply to other shapes of tanks.