| Aboveground Atmospheric Storage Tank | Welded carbon steel with a fixed or floating roof | From several thousand litres to more than 100,000 m³, depending on design and service | Crude oil, diesel, fuel oil, and refined petroleum products | Rolled steel shell courses, welded bottoms, roof structures, nozzles, vents, and access platforms | API 650; applicable fire and environmental regulations | Oil terminals, refineries, production sites, and distribution facilities | Foundation settlement control, weld inspection, spill containment, grounding, and overfill protection |
| Low-Pressure Storage Tank | Welded steel tank designed for controlled internal pressure | Project-specific; commonly used for large-volume industrial storage | Volatile petroleum liquids and products requiring vapor control | Reinforced shell and roof, pressure-vacuum protection, and engineered vapor-management systems | API 620; related process, fire, and environmental requirements | Refineries, petrochemical plants, and bulk storage terminals | Pressure relief devices, vacuum protection, controlled welding procedures, and inspection records |
| Shop-Fabricated Aboveground Tank | Factory-welded carbon steel or stainless steel tank | Commonly up to approximately 190,000 litres for standardized aboveground designs | Diesel, heating oil, lubricants, and selected petroleum products | Controlled factory fabrication, standardized fittings, leak testing, and easier transport to site | UL 142 where the design and jurisdiction require this listing; local fire codes also apply | Fuel stations, commercial buildings, farms, workshops, and backup-power facilities | Secondary containment, emergency venting, inspection of seams, and compliant dispensing equipment |
| Underground Storage Tank | Steel with corrosion protection or reinforced fiberglass-reinforced plastic | Typically several thousand to more than 100,000 litres per tank | Gasoline, diesel, aviation fuel, and other regulated petroleum products | Corrosion-resistant exterior, leak-detection systems, compatible piping, and anchoring where required | Local underground-storage regulations; installation requirements vary by jurisdiction | Service stations, airports, fleet facilities, and industrial sites | Release detection, corrosion control, sump inspection, overfill prevention, and groundwater protection |
| Double-Wall Storage Tank | Primary steel or composite tank enclosed by a secondary wall | Available in both shop-fabricated and larger engineered configurations | Diesel, lubricating oil, heating oil, and regulated fuels | Interstitial monitoring space between the primary tank and outer containment wall | Applicable fire, environmental, and tank-construction standards for the installation | Commercial, industrial, transportation, and fuel-distribution sites | Continuous or periodic interstitial leak monitoring, protected fittings, and documented integrity testing |
| Horizontal Cylindrical Tank | Welded steel or fiberglass-reinforced plastic with saddle supports | Commonly from approximately 1,000 to 100,000 litres | Diesel, fuel oil, lubricants, and process oils | Compact footprint, saddle supports, manways, vents, level gauges, and optional internal coatings | UL 142 or other locally accepted construction standards, when applicable | Small industrial sites, agricultural facilities, vehicle fleets, and heating systems | Support-load verification, anchoring, corrosion protection, safe fill connections, and spill control |
| Vertical Fixed-Roof Tank | Welded steel shell with cone, dome, or other fixed roof | From small industrial tanks to very large terminal tanks | Diesel, fuel oil, crude oil, and lower-volatility petroleum products | Efficient land use, shell stiffening, roof framing, vents, stairways, and roof-mounted instrumentation | API 650 is widely used for welded atmospheric tanks | Refineries, terminals, power plants, and manufacturing facilities | Vent sizing, roof drainage, corrosion allowance, settlement monitoring, and emergency response planning |
| Floating-Roof Tank | Welded steel shell with an internal or external floating roof | Generally selected for medium- to very-large-volume storage | Crude oil, gasoline blend components, and other volatile petroleum liquids | Floating roof, rim seals, roof drains, guide systems, and vapor-loss reduction features | API 650 and applicable air-emissions and fire-safety regulations | Refineries, oil terminals, and bulk petroleum storage facilities | Seal inspection, roof-drain maintenance, grounding, stormwater management, and overfill protection |
| Stainless-Steel Oil Tank | Welded stainless steel selected for corrosion or hygiene requirements | Project-specific, from small process vessels to industrial storage tanks | Specialty oils, chemicals, edible oils, and corrosive or contamination-sensitive fluids | Controlled material selection, clean welding, passivation where required, and product-compatible fittings | Applicable pressure, process, food, fire, and environmental standards based on service | Food-processing plants, chemical facilities, laboratories, and specialty manufacturing sites | Material compatibility, weld cleanliness, surface-finish control, traceability, and product-contact approval where required |
| Flexible or Bladder Storage Tank | Flexible coated fabric or elastomeric membrane supported by a containment system | Commonly used for temporary or moderate-volume storage | Selected oils and fuels compatible with the membrane material | Foldable construction, rapid deployment, low foundation demand, and chemical-resistant liners | Manufacturer design specifications plus applicable fire, environmental, and site regulations | Temporary projects, remote locations, emergency response, and limited-access sites | Membrane compatibility, abrasion protection, temperature limits, secondary containment, and routine leak checks |