Powder Coating

FACTORY POWDER COATED BOLTED STEEL TANKS

Superior Tank pioneered the use of factory powder coating on bolted steel storage tanks and our customers have been receiving the benefits ever since!

WHY CHOOSE POWDER COATING...

Our powder coating finish provides a number of advantages:

  • Outstanding durability with a design life of 20+ years
  • Eliminates the need for coating application in the field
  • SiZr seal beneath the powder coating provides secondary corrosion protection
  • Easy touch up and field repairs
  • 100% coverage to eliminate areas of exposed steel
  • Various powder formulas to meet project requirements
  • Lab tested durability
  • Ability to recoat/overcoat to extend the overall life of tank
  • Standard colors and hundreds of custom colors available
  • Environmentally friendly
Powder Coating Bolted Tanks

A COATING FORMULA TO FIT YOUR NEEDS

We offer various powder coating formulas to meet your project requirements and for greater longevity:

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EPOXY

NSF certified coating used on the inside of the tank for storage of water, wastewater and petrochemicals.

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NAP-GARD &
SCOTCHKOTE 134

Optional NSF certified coatings applied to the tank interior for storage of corrosive liquids including over 1000 chemicals and for additional corrosion protection.

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TGIC POLYESTER

Specially formulated for exterior applications, TGIC Polyester resists caulking and fading due to UV exposure.

WE ARE THE POWDER COATING EXPERTS

Powder coating differs from other coatings as the dry powder is applied to the tank components, then heat cured before the parts leave the factory. Superior Tank was the first to apply Thermoset Fusion Bonded Powder Coatings to Bolted Steel Storage Tanks and since then we have made significant investment in the latest technology and processes to ensure we provide an extremely durable finish. Our main powder coating line is over 500’ long with seven distinct stages.

  • Steel parts are prepared per the most stringent standard
  • SiZr underseal is sprayed on the bare steel
  • Interior powder coating is electrostatically applied
  • Powder coating is then heat cured for permanent bond
  • Steel staves are tested to ensure a holiday free finish
  • Inventoried components are carefully packed for shipment

After the steel tank parts are cleaned and prepared for coating using sandblasting to the Near White SSPC SP10/NACE No.2 standard, our SiZr seal is sprayed onto the steel providing a second layer of corrosion protection. Immediately after, we spray the dry powder coating onto the steel using specialized equipment to ensure proper application.

We use a small electrical charge to temporarily hold the powder to the steel until the coating is permanently thermoset in the ovens. This application process provides a smooth finish, free from drips and runs. The process also ensures all surfaces of the steel are completely coated, including hard to reach areas such as the top of roof rafters and the interior of pipes.

Our large ovens operate at approximately 350° and therefore we do not risk warping the steel staves which can occur when steel is exposed extreme temperatures. Before the steel staves are packed for shipping, they are holiday tested to ensure no voids exist.

SiZr SEAL. EXTRA DEFENSE AGAINST CORROSION.

To provide additional corrosion protection, we use a Silica & Zirconium (SiZr) liquid seal on all of our powder coated finishes. The seal is sprayed onto the prepared steel underneath the powder coating. Lab tests have shown the SiZr seal significantly slows the rate of corrosion and prevents the spread of corrosion when the coating surface is damaged by a dropped tool or thrown rock. By keeping the corrosion localized, the seal minimizes corrosion spreading and undercutting. In addition, the SiZr seal increases the coating adhesion and bonding to the steel thereby increasing the coating longevity. The SiZr seal can make the difference between a minor cosmetic touch up and a major coating repair.

STANDARD BOLTED TANK POWDER COATINGS

Shown colors are an approximation. Actual color may vary slightly. Custom colors available upon request.

INTERIOR COLORS – EPOXY:

Tank Tan



Appliance White



EXTERIOR COLORS – TGIC POLYESTER

Sky White



Uni-Cream



Almond



Bumped Black



Hunter Green



Camel



Superior Sand



ASA-70



ASA-61



Evergreen



PROTECTING THE PLANET AS WELL AS YOUR TANK!

: Powder coatings are environmentally friendly as they do not contain chemical solvents, as most liquid coatings do. These solvents evaporate during the curing process and can produce Volatile Organic Compounds (VOC), which contribute to air pollution. We also recapture all unused powder coating via specialized air filtration systems to significantly reduce particulate air pollution.

OUR GASKETS GO THE DISTANCE!

Our gaskets are formed to a precise thickness and bolt holes are in the exact location needed, eliminating bunching or overstretching which can result in leaks. To eliminate gaps between the bolts and the gasket, holes in the gasket are intentionally slightly smaller than the bolts. These factors combine to provide an outstanding gasket which will not move out of place, ooze or need to be replaced on a regular basis.

EPDM BUNA-N Viton
Application
Water
Oil & petrochemicals
Oil & petrochemicals
Material
Ethylene-Propylene-Diene-Monomer synthetic rubber
Nitrile based synthetic rubber
Propriety formula synthetic rubber
Operating temperature range (°F)
-70 to 300
-40 to +212
-15 to 400
Resistance
compression, sunlight, acetones, alkalis, ozone
compression, sunlight, acetones, alkalis, ozone
compression, sunlight, acetones, alkalis, ozone
Number of bolt rows
1, 2, or 3
1, 2, or 3
1, 2, or 3
Thickness
.093” & .124”
.093” & .124”
.093” & .124”
Width
1.5”, 3.5” & 5.5”
1.5”, 3.5” & 5.5”
1.5”, 3.5” & 5.5”
bolted_tank_gaskets

PROVEN RESULTS!

To illustrate the resilience of our coatings, the powder coating applied to our bolted steel tanks has been thoroughly tested by an independent technical laboratory and the results were outstanding!

The steel panels with the powder coating were subjected to a variety of industry recognized tests. A Coating Adhesion test was performed to ensure the powder coating will not flake off the tank and expose the bare steel. A Flexibility test and an Impact test were also performed to verify the coating durability. The final test was the Salt Spray test which simulates harsh conditions such as coastal areas and confirms our tanks will not corrode prematurely. The Salt Spray Test also verifies the coating’s resistance to corrosive liquids such as salt water. As shown in the charts below, our powder coating is extraordinarily tough.

Salt Spray Testing

POWDER COATING FORMULA: TGIC FOR EXTERIOR USE

Test Name Standard Conditions Results
Adhesion
ASTM D-3359-97
-
Rating = 5B (no coating removed)
Flexibility, Mandrel
ASTM D522-93a
100 / 80 in/lbs
No Fracture
Impact resistance
ASTM D2794-93-Gardner
100 / 80 in/lbs
Withstands impact
Pencil Hardness
ASTM D3363-92a
-
2H
Salt Spray Resistance
ASTM B-117-97
1000 hours
Passed

POWDER COATING FORMULA: EPOXY FOR INTERIOR USE

Test Name Standard Conditions Results
Abrasion resistance
ASTM D-3359-97
CS-10 wheel, 1kg weight for 1000 cycles
Coating loss only 24-45 mg
Adhesion
ASTM D-3359-Method B
Pressure sensitive tape used between 1/8” cross-hatch scribes
Rating = 5B (no coating removed)
Flexibility, Mandrel
ASTM D522-93a
1/8 in. dia
No Fracture
Impact resistance
ASTM D-2794-Modified
160” lbs of direct & reverse impact
Withstands impact
Pencil Hardness
ASTM D3363-92a
-
6H
Salt Spray Resistance
ASTM B-117
95˚F, 100% relative humidity, 5% salt fog -1000 hours
No undercutting displayed
NSF 61
-
-
Qualified

CHEMICAL RESISTANCE - EPOXY

Chemical Concentration Duration Results
Chlorine
1%
12 months
No effect
Anti-freeze
50% ethylene glycol
12 months
No effect
Sulfuric Acid
40%
12 months
No effect

SiZr SEAL

In addition to testing of our powder coating, we also had our SiZr seal tested to verify the effectiveness:

Test Name Standard Conditions Results
Salt Spray Resistance
ASTM B-117-97
1000 hours
Untreated steel panel: 3.2mm avg creepage
-
-
-
Treated steel panel: 0.0mm avg creepage
SiZr Seal Test Results