Introduction
Roben Manufacturing designs and fabricates API 650 tanks engineered for atmospheric storage of crude oil, refined petroleum products, water, and chemical service. Each API 650 tank is built to the American Petroleum Institute's flagship welded tank standard, ensuring structural integrity, predictable service life, and full regulatory acceptance across the oil, gas, and petrochemical industries.
What Is API 650 Tanks?
An API 650 tank is a welded vertical, cylindrical, aboveground storage tank designed for the storage of liquids at atmospheric pressure (internal pressures less than or equal to 2.5 PSIG). The API 650 standard governs material selection, design, fabrication, erection, inspection, and testing requirements for tanks ranging from small process tanks to multi-million-gallon terminal storage vessels.
Why You Need API 650 Tanks
- Industry Standard: API 650 is the most widely accepted standard for petroleum storage tanks worldwide.
- Regulatory Acceptance: Required by EPA, OSHA, and most state and local environmental authorities for hydrocarbon storage.
- Predictable Engineering: Standardized design rules eliminate guesswork and provide a defensible engineering basis.
- Long Service Life: Properly designed and maintained API 650 tanks routinely deliver 30-plus years of service.
- Insurability: Insurers and lenders frequently require API 650 conformance for petroleum facility financing and coverage.
Specifications and Technical Characteristics
- Standard: API 650 — Welded Tanks for Oil Storage
- Pressure Rating: Atmospheric (≤ 2.5 PSIG internal)
- Diameter Range: Up to 300 feet
- Height Range: Up to 80 feet (typical practical limit)
- Roof Configurations: Fixed cone, fixed dome, internal floating, external floating
- Materials: Carbon steel (A36, A516), stainless steel, aluminum
- Bottom Configuration: Flat, cone-up, cone-down per service requirements
- Inspection: Full RT, MT, PT, and hydrotest per API 650 requirements
Industries Served
- Oil and Gas
- Petrochemical
- Refining
- Chemical Processing
- Biofuels
- Power Generation
- Water Treatment
- Mining
Certifications and Standards
Roben Manufacturing fabricates this product line under the following industry standards and certifications:
- ASME Section VIII Division 1 and Division 2 — "U" and "U2" Stamps
- National Board "R" Stamp for repairs and alterations
- API 650 (Welded Tanks for Oil Storage) where applicable
- API 620 (Low-Pressure Storage Tank Design) where applicable
- API 653 (Tank Inspection, Repair, Alteration, and Reconstruction)
- PED (Pressure Equipment Directive) for European market
- CRN (Canadian Registration Number) for all Canadian provinces
- NFPA 30 (Flammable and Combustible Liquids Code)
- EPA Spill Prevention, Control, and Countermeasure (SPCC) compliance
Frequently Asked Questions
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