Introduction
Roben Manufacturing fabricates API 620 tanks for low-pressure storage of liquefied gases, refrigerated petroleum products, and other liquids requiring vapor pressures above atmospheric. Built to the API 620 standard for design and construction of large, welded, low-pressure storage tanks, our vessels deliver the structural performance and code compliance required for cryogenic LNG, propane, butane, and ammonia service.
What Is API 620 Tanks?
An API 620 tank is a welded, low-pressure storage tank designed for internal pressures up to 15 PSIG and operating temperatures down to -325°F. API 620 covers tanks too pressurized for API 650 but below the threshold of full ASME Section VIII pressure vessel rules, making it the standard of choice for cryogenic LNG, refrigerated propane, refrigerated ammonia, and similar liquefied gas applications.
Why You Need API 620 Tanks
- Liquefied Gas Storage: API 620 is the recognized standard for refrigerated and cryogenic gas containment.
- Cost-Effective Pressure Range: Bridges the gap between atmospheric API 650 and full ASME pressure vessel construction.
- Cryogenic Capability: Engineered for service down to -325°F with appropriate material selection.
- Code Compliance: Required by federal and state regulators for LNG and refrigerated hydrocarbon facilities.
- Vapor Containment: Designed to contain product vapor pressures up to 15 PSIG without venting losses.
Specifications and Technical Characteristics
- Standard: API 620 — Design and Construction of Large, Welded, Low-Pressure Storage Tanks
- Pressure Range: Up to 15 PSIG internal
- Temperature Range: Down to -325°F (cryogenic service)
- Typical Products: LNG, propane, butane, ammonia, ethylene, ethane
- Configuration: Single-wall, double-wall, full containment
- Materials: 9% nickel steel, stainless steel, aluminum, carbon steel (warmer service)
- Insulation: Perlite, polyurethane, vacuum-insulated annular space options
- Inspection: Full RT, leak testing, helium leak detection per API 620 Appendix Q/R
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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