Fully welded seams. Full contact. New seal technology. No enclosed spaces.
Less evaporation. More storage. More tank uptime. Strong as steel.
Proudly Made in America
A roof that will never trap explosive vapors.
Achieve new levels of safety with our innovative OpenRaft™ roof design (patent pending). It's the only aluminum IFR without closed compartments, making it impossible for vapors to get trapped inside. No more time-consuming tests and no more expenses to replace leaky buoyant members — only unprecedented safety.
An evaporation loss rate 74% lower than a typical aluminum IFR.
On a 120 ft gasoline storage tank, a welded DISCUS OpenRaft™ floating roof paired with a DISCUS StainlessLog™ seal reduces evaporation loss by over 6,300 pounds per year. Protect your investment and the environment.
This calculation is made using the EPA's Tanks4 evaporation loss estimating program for the following conditions: 120' x 52’ high tank, Gasoline RVP 9, (24) turnovers per year, (7) columns, (1) access hatch, (2) vacuum breakers, (1) slotted pole, meteorological data for Newark, NJ. DISCUS welded, suspended roof with DISCUS seals vs. non-contact roof with standard seals 5 ft wide bolted seams, (80) drains and (71) adjustable legs. Other comparisons may vary.
Increase your storage by 2,350 barrels per 120 ft tank.
The DISCUS OpenRaft™ roof and StainlessLog™ seal system floats 14 inches higher than other aluminum roofs, adding useful vertical storage capacity to each of your tanks. It floats higher because our roof and seal system does not need a secondary seal to comply with EPA rules. That means you can store 2,350 extra barrels per 120 ft tank.
DISCUS StainlessLog™ single seal vs. double seal (shoe with secondary) on other manufacturer’s aluminum IFR. Other seal and floating roof comparisons may vary.
The DISCUS roof and seal system is also designed to reduce dead storage below the deck. Because our seal mechanism does not extend below the IFR like other designs, you can eliminate up to 12" of dead space — and store an extra 2,000 barrels per 120 ft. tank.
Extend tank uptime by as much as 3 weeks per year.
Eliminate out-of-service seal inspections with our new StainlessLog™ seal. Our seal lets you complete your 10-year inspections safely and quickly while working atop the floating roof — and the EPA approves. These EPA-approved topside inspections can add up to 3 weeks of extra tank uptime per year.
The StainlessLog™ seal is a best-of-both-worlds design that combines the proven long life of a stainless steel shoe and the EPA-documented efficiency of a liquid-mounted seal. It does not require a secondary seal.
More benefits of the DISCUS OpenRaft™ Internal Floating Roof...
- Supports four men in one place, anywhere on the roof. API-standard roofs are only required to support two men. With the DISCUS OpenRaft™ IFR, rooftop jobs get done twice as safely.
- Strong as steel. Design live load of 12.5 PSF is 2.5x greater than all other aluminum floating roofs and equal to the API-required strength of steel IFRs.
- No evaporation loss through drains. Like a steel pan roof, the DISCUS IFR works without drains. Drains on other aluminum roofs increase odors and evaporation losses. Our OpenRaft™ IFR does not have drains, which means zero pounds of yearly evaporation loss through drains.
- The welds are for sealing — and that's it. DISCUS seam welds are not required for structural integrity. Instead, their geometry is optimized for sealing the seams, weldability and ease of inspection.
- Optional non-welded seams have a tested loss factor many times lower than the EPA generic seam loss factor. The non-welded seams are sealed and clamped for an economical installation and a tight seal. These seams are designed for a relatively easy, in-field upgrade to fully welded seams at any time. The DISCUS non-welded internal floating roof is BACT and RACT compliant.
The roof and seal are new, but we're not.
Here is why you can trust us:
President David Rosenkrantz P.E. and the management team each average 37 years of petrochemical industry experience.
David lives and breathes volatile organic compounds — well, almost. He has contributed to numerous API standards and methods, and he helped to develop the EPA regulations that govern floating roof tanks.
So far, David has managed engineering for over 760 tank and roof projects in all 50 states and 56 countries.
He's designed and introduced over 20 profitable product lines, including full- and non-contact floating roofs, seals, dome roofs, and accessories for floating roofs and tanks. Along the way, he has successfully prosecuted floating roof and seal patents.
After all this, he still puts on the hard hat, Nomex and steel toed boots to join clients inside their tanks for inspections, installations and repairs — and he's ready to join you in yours.
Contact us. We want to help you improve your storage.
If you aim to improve the safety, profitability and efficiency of your VOC storage facility, please contact us with the form below. You'll hear from a professional engineer within 24 hours to analyze how DISCUS can help.
Call us at 610-349-4429.
Our Guarantee
Our handshake means that we will stay at your jobsite until you are 100% satisfied. It means that we are always here for you, ready to help.
Materials and workmanship are guaranteed for one year.