A tank cover does quiet, essential work: it protects the stored liquid, contains vapor and odor, limits evaporation, and keeps operators out of avoidable maintenance. Aluminum is purpose-built for that job because it is corrosion-resistant, lightweight, and adaptable to concrete, welded steel, and bolted steel tanks.
01 Why aluminum covers fit storage tanks so well
Tank headspaces are hard on conventional roof materials. Humidity, chemical vapor, disinfectants, wastewater gases, and exterior weather all accelerate corrosion and concrete deterioration. Aluminum solves the core problem with a material that does not rust, keeps dead load low, and performs well over long service lives.
That combination matters on both new and existing tanks. New builds can coordinate shell, anchorage, appurtenances, and loading from the start. Replacement projects benefit from aluminum's low weight because many existing shells and foundations can accept a dome roof without the reinforcement a heavier cover would require.
02 Aluminum geodesic domes
An aluminum geodesic dome is a clear-span fixed roof that bears at the tank perimeter. It covers the tank without interior columns, reducing maintenance points inside the vessel and preserving access below the roof.
For open-top tanks, domes keep rain, snow, debris, and birds out of the stored liquid. For process and wastewater tanks, they help contain odor and vapor. For aging roof replacements, they provide a practical alternative to rebuilding a deteriorated concrete or steel roof with another corrosion-prone system.
A dome is usually the right cover when the tank needs a fixed weather barrier, vapor control, long-span access, or a replacement for a failing roof.
03 Internal floating covers
An internal floating cover sits directly on the liquid surface inside the tank. Instead of enclosing the headspace from above, it reduces the exposed liquid area that drives evaporation, emissions, odor, and light-driven biological growth.
Floating covers are useful for potable water, process water, fuels, solvents, and odor-control applications where the liquid surface itself is the problem. They can also pair with a dome roof when a project needs both weather protection and surface-level emission or evaporation control.
04 Cover accessories
A cover is a system, not just a roof. TanksandCovers supplies the accessory package that makes the cover usable, inspectable, and compatible with the tank's operating conditions:
- Venting for fill, drawdown, pressure, vacuum, and thermal breathing.
- Access including manways, hatches, gauge hatches, and access doors.
- Sealing including peripheral seals, batten systems, gaskets, and perimeter details.
- Safety including handrails, fall protection, platforms, and code-compliant walkways.
- Flat and launder covers for troughs, weirs, channels, rectangular basins, odor capture, and debris exclusion.
05 Choosing the right cover
| Need | Aluminum Geodesic Dome | Internal Floating Cover | Cover Accessories |
|---|---|---|---|
| Where it sits | Fixed roof on the shell, above the liquid | Floats directly on the liquid surface | Integrated into domes, covers, and open tanks |
| Primary function | Weather barrier, vapor containment, clear-span access | Evaporation, emission, odor, and algae reduction | Venting, access, sealing, safety, and maintenance |
| Best fit | Open-top exposure, roof replacement, debris control, vapor control | Surface-driven loss, odor, VOC control, product quality | Finished cover systems and operational requirements |
| Tank types | Concrete, welded steel, and bolted steel | Concrete, welded steel, and bolted steel | Concrete, welded steel, bolted steel, troughs, and basins |
The dome and floating cover are not competing answers. They solve different problems, and many tanks use both when the project requires a fixed roof and surface-level vapor or evaporation control.
06 Built for new builds and replacements
Aluminum covers are engineered around the tank they land on. For new builds, that means coordinating shell top details, anchorage, appurtenances, code loads, and access. For replacements, it means evaluating the existing tank, matching the perimeter attachment to the shell, and minimizing downtime during the changeover.
That flexibility is especially useful when a concrete roof is spalling, leaking, or shedding material into the tank, or when a steel roof has reached the point where repairs no longer make sense. A lightweight aluminum dome gives the owner a durable roof system without repeating the corrosion and maintenance problem that caused the replacement.
From clear-span geodesic domes to internal floating covers and the vents, hatches, seals, walkways, and flat covers that complete the system, aluminum gives tanks durable coverage without the corrosion burden of steel or concrete.
On concrete, welded, or bolted tanks, new or existing, TanksandCovers.com has the coverage your project needs.