Engineering & Construction Co. Ltd

Underground storage tanks are a viable option for your fuel, chemical or oily water storage. Safety, fire codes, aesthetics, limited available real estate for distance requirements, SPCC compliance or even fear of vandalism or tampering, these are all factors when you’re planning fuel or hazardous material storage. The EPA regulates the type of tank that can be buried. The sti- P3 tank design meets and exceeds those regulations for underground petroleum and chemical storage.


10m3 Generator fuel feeder Tank
Oil & Gas


For over 10 years, as a licensed member of the Steel Tank Institute (STI), Southern Tank manufactures the STI’s proven sti-P3® underground storage tank with its pre-engineered cathodic protection system. A UL-58 labeled steel tank receives a corrosion resistant coal tar epoxy coating on a prepared surface. This coating combined with dielectric bushings and sacrificial anodes gives you the peace of mind that your underground tank will be protected against corrosion when properly installed (sites should have a corrosion study performed prior to installation). A permanently buried PP4 reference cell provides a simple and easy method for the owner to monitor the sacrificial anodes to ensure that they continue to work as intended.

Most states now require secondary containment  for new or replacement installations as mandated by the EPA (see for current regulations). The sti-P3® tank technology will satisfy this secondary containment requirement when constructed as a double-wall tank. All double-wall sti- P3® tanks are shipped with a vacuum applied to the interstice. The interstitial monitor pipe of the double-wall design also allows for easy leak detection either manually or electronically. Using a double wall tank and monitoring the interstitial area per the EPA criteria will allow for testing of the system to be reduced after the initial 6 month test to only after a qualifying event.

Sti- P3 ® tanks are available in capacities of 100 gallons to 20,000 gallons for a double-wall design, and up to 30,000 for single wall tanks. Available internal linings or inner tanks made from stainless steel allow you to store contaminated liquids, water, jet fuels and most chemicals safely underground. The sti-P3® can be constructed with multiple compartments, reverse flanged manways, extensions, sumps, internal ladders, hold down straps, etc. and special openings such as 150# flanges if required.

When you need to store fuel underground, orlandoh engineering  and let us provide you with an sti-P3 steel underground storage tank – structural strength and time-tested reliability to protect your investments and our ground water.


The range of applications for underground tank installation are as varied as the site conditions in which orlandoh Tank performs each installation.  USTs typically store fuel that powers critical equipment, from generators to entire heating systems. Each one of our customers requires a unique choice of tank products. Our equipment and technology can satisfy a range of storage challenges and goals.

One key reason customers appreciate orlandoh Tank is our crew’s professional expertise and technical skill. Our technology and construction teams go above and beyond what is expected of most tank installation companies. Our level of service and installation quality meets or exceeds the manufacturer’s requirements. The fuel system work area is always kept neat and orderly with minimal disruption to the facility and grounds. We strive to provide customers with a professional and streamlined process of exceptional communication, from scheduling to coordination to completion of your job.

Orlandoh  is a certified installer of Xerxes, Containment Solutions, and Highland underground tanks. Benefits of these products are outlined below, as well as examples of orlandoh Tank installation projects.

Fiberglass fuel storage tanks by Xerxes are a rust-proof alternative to steel tanks. Sizes and types of well- priced Xerxes products we install range from double-wall fiberglass, to multi-compartment fiberglass, and triple-wall fiberglass storage tanks. The choice of single wall fiberglass tanks is not recommended for use in New England because of the stability of mixed soils. Use of a double-wall fiberglass tank is a better application, as it provides twice the rigidity and strength of a single wall. Water and air exposure does not break down a double-wall fiberglass tank because fiberglass is not susceptible to internal corrosion.

Containment Solutions Inc. (CSI) is the largest American fiberglass tank, manufacturer. The UL 1316 specification which governs underground fiberglass tank manufacturing was the result of CSI’s design work. CSI instituted and perfected the use of specially treated silica in their laminate matrix. The CSI tank wall is composed of resin, glass and specially treated silica that together results in a composite matrix compatible with petroleum industry products including:

orlandoh  Tanks combine the structural strength of steel with the lasting protection of polyurethane. One thing common to all underground tanks is that they are coated in polyurethane, which provides permanent and effective corrosion protection for the life of the tank. If corrosion is your biggest concern, then the P3 line of tanks offers protection in three ways: dielectric coating, electrical isolation, and sacrificial anodes. Home use and commercial use models of these tanks are available.  In addition to fuel and lube oil storage tanks, models are also available for potable water storage, fire suppression, and wastewater. Each level and size of tank comes with a 20 to 30-year guarantee, depending on the model, when installed to the manufacturer’s specifications by a certified tank installer.


The Steps of an Underground Fuel Tank Installation

The installed tank will be tested and left ready for operation. Tank and piping tightness, as well as the satisfactory operation of monitoring systems, will be ensured prior to the system being placed into operation. Satisfactory operation of the secondary containment system and overfill prevention devices, impact valves and line leak detectors will also be tested.

In a typical fuel tank installations , we will install a tank inventory management system, which will measure liquid at the interstitial space (between the inner steel tank and the fiberglass outside containment). It will measure the amount of gas or water (if any) inside the tank. It will also trigger an alarm in case the tank exceeds its filling capacity. The system will be able to detect any leaks that may develop in the underground feed and return lines.

Whatever the size or storage requirements of your project, our goal is to provide you with a storage tank system that will provide you many years of reliable service. For examples of our work please see the  section of our web site.


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Under Ground Tanks

Horizontal cylindrical single and double-walled tanks for underground storage of  flammable and non-flammable liquids. Made by using shell plates and dished ends made in carbon steel type  A36 complying with UNI EN 10025.

The external shell is welded by submerged arc welding procedure while the internal part is MIG-welded where necessary Parts are designed in compliance with rules and regulations in force.

Single-walled tanks form an impermeable containment; they act as the inner tank of double-walled tanks.

Double-walled tanks; for these tanks, a secondary wall is welded around the inner tank, which forms an impermeable self-contained tank. These tanks are provided with two sockets for the leak detection system in order to permanently monitor the integrity of the tank.
All tanks are hydraulically tested. Tests are pressure tests and are performed to check the inner tank and the interstitial space between the inner and the outer tanks as well.

Fields of application:
Single-walled tanks are mainly used for:

Double-walled tanks are generally used for:

External coatings:
Each tank is provided with an external protection coating which also acts as cathodic protection.
The external coating of each tank undergoes a high-voltage test in order to prove its integrity.
EPOXY-TAR: coated externally with epoxy-tar paint consisting in an epoxy-based, 2-component product made with epoxy resins modified by a coal tar-based hydrocarbon resin.
FIBERGLASS (GRP): steel plates are sandblasted (SA 2.5 – ISO 8501-1) and coated externally with a reinforced fiber-glass coating.Internal coatings:
When an internal coating is required, tank’s inner surface is prepared in accordance with the customer’s requirement and the coating manufacturers specifications to ensure permanent adhesion of the selected coating. On request we can provide the following internal surface coating:

Underground storage tanks are a viable option for your fuel, chemical or oily water storage. Safety, fire codes, aesthetics, limited available real estate for distance requirements, SPCC compliance or even fear of vandalism or tampering, these are all factors when you’re planning fuel or hazardous material storage. The EPA regulates the type of tank that can be buried. The Carbone mild steel tank design meets and exceeds those regulations for underground petroleum and chemical storage.

When it comes to steel storage tank manufacturers, our underground tanks provide the ultimate in structural strength and compatibility for biofuels and additives, such as our single skin and  double wall tank installed for underground fuel tank storage and other applications.

Are you Planning to Build  a Fuel Station?

Are you having to store fuels required for daily use in a fuel gas Station?

Our underground steel tanks provide superior structural strength and product compatibility. Designed to withstand the harsh conditions of the underground environment, they are serviceable for storing a wide range of petroleum products and other hazardous liquids. Tank dimensions and thicknesses are calculated in strict compliance with API Formulas for Stress and Strain as presented in UL-58 (Not listed). In addition, customization to suit your requirements is always available. A variety of industry-proven corrosion protection systems can be selected to be installed on our underground fuel storage tanks using a variety of backfill materials. Capacities from 240- 50,000 gallons, exterior full fillet lap joints, striker plates under every opening, seam inspection, and 5 psi factory air tests, our underground storage tanks are dispatched after rigorous leak testing .

Our underground tanks also come with FRP/ GRP linings externally to suit buried applications.

Shop Fabrications

Steel fuel containment systems have a proven history of providing reliable and safe storage of fuel products. With the addition of a fiberglass reinforced “FRP” outer, secondary containment layer the Elutron® fuel storage system creates a high performance, seamless and durable underground storage solution. The 360º interstice between the steel and FRP secondary containment is created by incorporating an aluminum foil layer which in turn provides a system for monitoring inner tank integrity. The steel inner tank provides the highest level of structural stability while the outer FRP layer provides complete protection from underground environmental conditions. The UL Listed Elutron® Double Walled Fiberglass Jacketed tank system meets the EPA 40 CFR subpart B, 280.20 standards for new underground storage tanks.

Orlandoh Steel’s Elutron® underground fuel storage tanks are compatible with water, gasoline, jet fuel, methanol and ethanol in varying concentrations, E 10, E-15, E-80, E-100 and kerosene commonly used in a variety of applications such as fuel stations, emergency power generators, and farm and residential operations and can incorporate multiple compartments. Installation of Elutron® diesel underground storage tanks is uncomplicated and due to the inherent, long term strength of steel are less dependent upon backfill for support when compared to non-metallic underground tank systems. Non-metallic underground tank systems require high-quality gravel backfill and a greater distance between adjacent tanks.

Each Elutron® system is supplied with a factory-established interstitial vacuum. Prior to delivery, our team cleans and levels all the fittings and marks the center lines on each tank. These details save installers several hours of work normally spent on the pre-installation testing and cleaning of non metallic tanks.

Quality is built-in to every tank system Orlandoh Steel fabricates and our production facility is certified and regularly audited by the American Petroleum Institute and Underwriters Laboratories.

Orlandoh Steel is a reliable partner with over 70 years of experience fabricating superior steel products including a wide array of storage tanks such as above ground fuel storage tanks, Fireguard® fire rated fuel storage systems, modular agricultural fuel storage tanks and petroleum storage tanks for oilfield applications.


  • Every tank is tested per the UL standard 58+UL1746 to ensure it meets the specifications required by the National Fire Protection Association
  • All of our welders are AWS certified
  • Orlandoh  Steel maintains a comprehensive Quality Management System that guides every aspect of our operations including sourcing, planning, and manufacturing processes


  • 10 plus years of complex and critical steel tank fabrication
  • American Petroleum Institute and Steel Tank Institute certified and UL Listed
  • Orlandoh is dedicated to the highest levels of safety
  • Unsurpassed customer support and commitment to on-time delivery


  • Sump collars
  • Manholes
  • Threaded or flanged ports
  • Deadman anchors
  • Hold down straps
  • Turnbuckles
  • Submersible pumps



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