View Glasteel II


Think about it - despite what you’re being told, there is no such thing as “maintenance-free” when it comes to underground storage tanks. Modern Welding pioneered the steel storage tank industry. We take a long-term approach with our customers, focusing on service and ensuring that you get the maximum return on your investment. Steel is stronger, lasts longer, safer and more ecologically friendly than alternative materials. Steel tanks will also save you money in the long run.


The Benefits of



The Truth about




Superior Strength

Superior independent strength of steel means backfill plays a minimal role in supporting a tank under load. This means a low probability of structural damage to the primary tank during installation.      

The structural strength of steel allows for flat head design which means more efficient use of space.   


Structural Weaknesses

Inherent structural weakness means backfill and compaction are critical for proper tank support. When fiberglass has structural damage it is often blamed on installation mistakes which could void warranty coverage.

The structural weakness of fiberglass requires a domed head design. So a fiberglass tank will be longer than a steel tank of the same volume. A longer tank means potentially a higher cost of shipping and certainly excavation of a larger area.


The Safe Choice

The compatibility of steel should give you peace of mind when it comes to changing fuel formulations. Think about it – what material is used in all upstream and midstream fuel production? It’s Steel!  

Steel tanks are the safe choice for compatibility with ever changing fuel additives. Steel can actually benefit from fuel additives that are specifically formulated to preserve metal engine parts.


Leaching, Blistering, Cracking

The compatibility of fiberglass should cause concern with changing fuel formulations given ongoing reports of delamination, leaching, blistering and cracking from compatibility issues with current fuels. Such problems are no concern with steel. 

Fiberglass may have compatibility issues with fuel additives that are processed in steel tanks and pipes and specifically formulated to preserve metal engine parts.    


All Tanks Require Maintenance

Steel tanks depend on maintenance – we aren’t afraid to say it. Neglecting your tank can result in degradation of the fuel being stored, clogged filters, potential engine damage, unsatisfied customers, degradation within the primary tank itself and even deterioration of the equipment associated with fuel dispensing. No tank is immune.


Not Maintenance-free

Fiberglass tanks depend on maintenance. Despite what you are told, the notion of a maintenance-free tank is a dangerous one. Simply put, the absence of maintenance can result in poor fuel quality, unhappy customers, and a high probability of tank failure. Furthermore, if fiberglass tank companies are so confident their product is maintenance-free, why do some manufacturers exclude coverage for lack of maintenance?      


#1 Recycled Material in the U.S.

Steel has environmental advantages over fiberglass because of its high recyclability. At 80 million tons per year, steel is the most recycled material in the United States.    


Expensive Renewable

Fiberglass can be recycled but it has its challenges. The processes available are complex and very expensive. In many cases the process itself does harm to the environment. Research and development continues to make this a more viable renewable but unfortunately most scrap fiberglass ends up in a landfill. 


Faster Profitability

Steel has the economic advantage over fiberglass. Not only will you get a long life out of your steel tank, there’s also considerable up front savings with the purchase and installation of your tanks, making you profitable much faster. See comparison below.    


Slower Installation

Fiberglass is a synthetic material that requires expensive raw materials and labor intensive manufacturing to produce. The structural fragility of fiberglass necessitates larger excavation and complex installation. See comparison below.



12,000 gallon double wall, 8’ diameter, Split Compartment Tank

Glasteel II Tank

Moderately Priced

Up to 30% less than cost of fiberglass.

Based on published discounted prices.


High Priced

Fiberglass USTs are typically the most expensive on the market. 



12,000 gallon double wall, 8’ diameter, Split Compartment Tank

Glasteel II Tank


Includes 3 tank installation cost. Excavation dimensions: 32’ wide x 38’ long x 13’6” deep. (Estimate for typical installation with unstable soil – prices vary.)



Includes 3 tank installation cost. Excavation dimensions: 39’ wide x 49’ long x 14’ deep. (Estimate for typical installation with unstable soil – prices vary.)

Modern Cutaway