Above Ground “Polyethylene Within
Steel” Tanks
These systems are comprised of two separate
but integral units. The primary interior
storage tank is constructed of seamless
polyethylene which is both compatible with
heating fuel and is not electrically conductive,
thus it is not susceptible to the electrochemical
mechanics of corrosion.
This tank is within a secondary galvanized
steel enclosure which provides structural support
for and protection of the polyethylene tank
while providing secondary containment should
the polyethylene tank leak.
14 National Oilheat Research Alliance
Roth Tank Installation Instructions can be
found at: roth-usa.com/PDF_Download_Files/
DWT%20Installation%20Manual%202017.pdf
Granby 2 in 1 installation instructions can
be found at: granbyindustries.com/wp-content/
uploads/2017/04/si0018-fa-granby-2-in-1-install
instructions.pdf
Above Ground Fiberglass Tanks
Above ground fiberglass tanks are available
for both indoor and outdoor installations. These
UV and fire resistant tanks do not corrode.
They are available in 240 and 300 gallon
sizes as well as both single wall and double
wall construction. The double wall model has a
visual sight glass to facilitate inspection.
The dimensions of these tanks are slightly
different from those of the standard 275 gallon
ob-round tanks.
Capacity Length Width Height
240 US Gallons 65" 24" 53"
300 US Gallons 80" 24" 53"
Granby above ground fiberglass tank
installation instructions can be found
at: granbyindustries.com/wp-content/
uploads/2017/04/SI-0152-rev-1a.pdf
Tank Type - In Ground
NFPA 30 stipulates that underground storage
tanks and their piping be protected from corrosion.
Unprotected steel tanks are not compliant
with the requirements of the major code bodies.
While these tanks provided many years of
secure storage age, combined with the
inability to visually inspect them, resulted in
tank failures along with other issues this guide
seeks to address.
“Polyethylene within steel” tanks
Fiberglass tanks