Wastewater Treatment Systems - page 8

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Highland Tank Sets the Standard
We offer innovative steel fabrication
combined with a variety of specialty
coatings designed to meet your
specific needs. Many of our products
feature patented technology, including
coalescer, state-of-the-art
coatings and linings and fabrication
techniques. Highland Tank separators
are built to one or more of the
standards listed below:
American Petroleum Institute
• API - 421
Laboratories, Inc.
• UL-58
• UL-142
• UL-1746
• UL-2085
Highland Tank Oil/Water Separators
are available with a UL-SU2215
label meeting UL’s strict construction
and performance requirements.
Single-Wall Construction
The fabrication process begins with
rolling steel that meets ASTM
specifications. Steel plates from 7
gauge to 1-1/4
inch thick
are rolled
to form the rigid shell. Steel plates
are formed, fitted and lap-welded to
provide superior
Flat-flanged heads are standard, as are
continuous exterior welds on all joints.
Single-Wall Construction
Double-Wall Construction
Primary Tank
Monitoring Pipe
HighGuard or Other Exterior
Protective Coating
Primary Tank
Tank Interstice
Secondary Tank
Double-Wall Construction
Double-wall separators are constructed
by wrapping a secondary wall
completely around the primary tank.
The space between the two walls,
known as the interstice, assures a
rapid fluid migration rate not less than
one centimeter per second, vastly
superior to the allowable rate. The
interstitial space can be electronically
monitored to immediately detect a leak.
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