Rectangular Tanks for Fuel and Liquid Storage
Rectangular tanks provide a flexible storage solution for fuel, oil, lubricants, DEF, waste oil, chemicals, water, and other compatible liquids. For example, Clark Welding Tanks can manufacture custom steel rectangular tanks around your available space, storage requirements, and equipment needs.
Whether your project requires a low-profile tank, a slim design, or a custom footprint, our rectangular storage tanks help maximize available space. As a result, they work well for commercial, industrial, agricultural, fleet, and specialty applications where standard tank designs may not fit.
In addition, rectangular tanks are available with multiple compartments, pumps, hose reels, filtration, gauges, coatings, supports, and other accessories. Depending on your application, we can manufacture rectangular tanks to meet UL 142 requirements or provide UL 2085 protected designs for projects requiring additional fire protection.

WHAT ARE RECTANGULAR TANKS?
Rectangular tanks are custom-built steel storage tanks designed for applications where a traditional cylindrical tank may not fit the available space. Their unique shape allows customers to maximize storage capacity while working around height restrictions, narrow areas, and other installation challenges.
Clark Welding Tanks manufactures steel rectangular tanks for storing diesel fuel, gasoline, lubricants, waste oil, DEF, chemicals, water, and many other compatible liquids. For example, these tanks are commonly used in commercial, industrial, agricultural, fleet maintenance, and specialty applications.
Unlike standard cylindrical tanks, rectangular storage tanks can be customized around your specific footprint. For example, low-profile designs work well in areas with limited overhead clearance. Meanwhile, slim tanks can fit through narrow spaces or doorways. Bench-top and under-catwalk designs also provide practical solutions for specialized installations.
In addition, rectangular tanks can be manufactured with multiple compartments to store different products in one tank. As a result, customers can store several oils, lubricants, or other compatible liquids while using less floor space. Double bulkhead dividers provide added separation between compartments and help reduce the risk of stored products mixing.
Depending on your project requirements, Clark Welding Tanks can manufacture rectangular tanks with UL 142 construction or UL 2085 Fireguard® protected designs. For more information, you can also review UL’s information about UL 142 aboveground tanks and STI/SPFA’s Fireguard® information to learn more about these standards and protected tank construction.
IS A RECTANGULAR TANK RIGHT FOR YOUR PROJECT?
Rectangular tanks offer flexibility when standard tank dimensions do not work for your available space or application. Whether you need a low-profile design, multiple compartments, or a tank built around existing equipment, we can customize the size and configuration to fit your operation. In addition, these tanks can support storage, dispensing, lubrication, and other specialized applications.
Every project has different requirements. For that reason, we can customize the height, width, capacity, and footprint around your available space.
SPACE-SAVING DESIGN
When installation space is limited, rectangular tanks provide a practical solution. For example, they work well in areas with height restrictions, narrow access points, equipment limitations, or unique layouts.
In addition, rectangular tanks can include multiple compartments for storing different liquids in one tank. As a result, this option works well for oils, lubricants, fuels, DEF, and other compatible products.
Whether you need basic storage or a complete lubrication or fueling system, we can customize your tank with pumps, hose reels, meters, filtration, coatings, supports, and other equipment.
AVAILABLE CONFIGURATIONS & EQUIPMENT
Choosing a rectangular tank involves more than selecting a size. First, consider your available space, stored product, installation requirements, and how you plan to use the tank. In addition, think about future storage needs, equipment requirements, and access requirements before selecting your final design. Then, we’ll help you choose the right construction, capacity, accessories, and options for your project.
- Tank Construction
- UL 142 Tanks
- UL 2085 Protected tanks
- Single Wall
- Double Wall
- Split Compartments
- Sizes & Materials
- Custom Capacities
- Carbon Steel
- Stainless Steel
- Built to Customer Specifications
- Tank Designs
- Low-Profile Rectangular Tanks
- Slim Rectangular Tanks
- Cube Tanks
- Bench-Top Tanks
- Under-Catwalk Tanks
- Custom Fabrication
- Custom Openings
- Special Nozzle Layouts
- Custom Dimensions
- Custom Fittings
- Supports
- U-Shaped Supports with Heavy-Duty Casters
- L-Shaped Feet
- Channel Iron Bases
- I Beam Skids
- Forklift Pockets
- Finishes
- Zinc Red Oxide Primer
- Six Standard Top Coat Colors
- Interior Coatings
- Equipment Packages
- Pumps & Dispensing Equipment
- Gauges & Level Monitoring
- Overfill Prevention
- Vents & Fill Connections
WE’LL HELP YOU CHOOSE THE RIGHT TANK
Every project is different. Before ordering a rectangular tank, consider your available space, stored product, capacity requirements, and how you plan to use the tank. For example, height restrictions, doorway dimensions, or nearby equipment may affect the final design.
In addition, think about installation access, equipment needs, and future expansion before making your decision. Then, our team will help you choose the right rectangular storage tank, construction style, accessories, and equipment options for your application.
Project Planning Checklist
- Available Space and Dimensions
- Height and Width Restrictions
- Stored Product
- Tank Capacity
- Single or Multiple Compartments
- Pumps, Hose Reels, and Equipment
- Installation Access
- Supports and Mounting Requirements
- Local Code and Project Requirements
For additional guidance, explore our Choosing the Right Above Ground Fuel Storage Tank guide, review our Tank Options for additional guidance. Then, contact our team for help designing your rectangular tank solution.
Helpful Resources for Rectangular Tanks
Before selecting a rectangular tank, explore these guides and resources to better understand tank construction, storage options, equipment, and project planning. Whether you’re comparing tank designs or preparing for a new installation, these resources can help you make an informed decision. In addition, they can help you understand which construction standard and equipment options may fit your application.
First, learn how tank type, capacity, containment, installation requirements, and equipment options affect the right storage solution for your application.
Tanks
Next, learn how UL 142 tanks are designed, where they are commonly used, and which configurations may fit your fuel storage project.
UL 2085 Fireguard® Tanks
If your project requires additional fire protection, explore UL 2085 Fireguard® tank construction, features, and common applications.
Finally, explore pumps, meters, filtration, supports, monitoring equipment, and other accessories available for custom tank projects.
See Our Rectangular Tank Projects
Browse more than 700 project photos spanning more than three decades of manufacturing. Whether you’re looking for rectangular tanks, custom fabrication, or complete storage solutions, our portfolio showcases a wide variety of completed projects. In addition, you’ll find custom tanks, equipment packages, dispensing systems, accessories, and installations from customers across many industries.

RECTANGULAR TANKS
For example, see custom-fabricated tanks, specialty projects, and unique solutions built around customer specifications and installation requirements.

CUSTOM FABRICATION
See custom-fabricated tanks, specialty projects, and unique solutions built around customer specifications and installation requirements.
DISPENSING SYSTEMS
In addition, discover pumps, meters, filters, hose reels, cabinets, and complete equipment packages designed for reliable fuel and liquid transfer.

TANK SUPPORTS & ACCESSORIES
Finally, explore custom supports, skids, platforms, ladders, handrails, and other accessories designed to complete your tank system.
Ready to Get Started?
Every application has different storage requirements. Whether you need a compact tank for a limited space, a multi-compartment system, or a complete storage and dispensing solution, Clark Welding Tanks can help you design the right rectangular tank for your project.
First, we’ll learn about your stored product, available space, equipment needs, and installation requirements. Then, we’ll help you choose the right tank construction, capacity, accessories, and options for your operation. Finally, contact our team to request a quote and get your project started.