API 650 is the global authoritative standard for welded aboveground steel oil storage tanks, covering full lifecycle requirements for tank design, fabrication, welding, inspection and on-site erection. It applies to carbon steel, stainless steel and aluminium tanks, widely used in refineries, terminals, pipeline stations and various industrial process facilities. The standard defines minimum criteria for materials, construction and testing of all-sized open/closed-top cylindrical storage tanks, mainly for atmospheric service. With optimized enhanced design, the tanks can also adapt to higher internal pressure working conditions. This specification only serves non-refrigerated, fully bottom-supported tanks with a maximum design temperature of 90°C (200°F), requiring a minimum material thickness of 3/16 inch for structural safety.
Featuring a maximum working pressure of 2.5 PSI and a wide operating temperature range from -40°F to 500°F, API 650 tanks deliver superior high-temperature performance compared with API 620 tanks. They are universally applicable for safe storage of crude oil, gasoline, various industrial chemicals and produced water. As standard-compliant industrial storage equipment, our API 650 tanks provide reliable, safe and cost-effective solutions for global petroleum and chemical storage projects.
Core Standard & Technical Specifications
All our tanks strictly comply with full API 650 specifications. Below are the standardized core technical parameters for reliable industrial storage:
- Applicable Standard: API 650 (Welded Tanks for Oil Storage), global industry benchmark for atmospheric steel storage tanks
- Pressure & Temperature: Max working pressure 2.5 PSI; operating temperature range -40°F ~ 500°F (better high-temperature resistance than API 620); max non-refrigerated design temperature 90°C (200°F)
- Storage Medium: Crude oil, gasoline, diesel, fuel oil, industrial chemicals and produced water (specific gravity ≤ 1.0)
- Capacity & Size: Fully customizable with no capacity limit, covering small modular tanks to large-scale million-gallon oil depots
- Materials & Thickness: Available in carbon steel, stainless steel and aluminium; strictly follows 3/16 inch minimum material thickness requirement with full material traceability
- Structural Design: Precise shell thickness calculation and controlled hoop stress; optional customized corrosion allowance
- Low-Temperature Safety: Mandatory Charpy V-notch impact testing for low-temperature environments to prevent steel brittle fracture
- Service Limitation: For non-refrigerated, full bottom evenly supported tanks; higher working pressure available via enhanced design
Product Advantages & Value
1. Full API 650 Compliance, Global Project Adaptability
100% API 650 compliant with standardized design, welding and inspection processes. Fully recognized by international engineering contractors and third-party authorities, suitable for global oil & gas project delivery and acceptance.
2. Superior Structural Safety & Zero-Leakage Performance
Precision-calculated welded steel structure with full NDT welding inspection. Integrated sealing design ensures zero leakage, avoiding liquid loss, environmental pollution and operational safety risks for long-term stable service.
3. Customized & Scalable Engineering Solutions
Fully customizable tank size, roof type (fixed/floating), anti-corrosion coating, insulation and accessories. Flexible solutions for small buffer storage and large centralized oil depot projects.
4. Durable & Low Maintenance Cost
High-quality certified raw materials plus professional anti-corrosion treatment deliver excellent weather and corrosion resistance. Low daily maintenance cost and long service life improve project ROI.
5. Complete Supporting Accessories & Easy Operation
Complete standard accessories including manhole, level gauge, pressure relief valve, breather valve and anti-static devices. Compatible with automatic monitoring and fire protection systems for safe, intelligent operation.
Manufacturing & Quality Control Process
We enforce full-process quality control to ensure every tank fully meets API 650 standards:
- Material Inspection — Strict incoming inspection with full material traceability and certification verification
- Precision Design — Finite element analysis and customized structural design per site and medium conditions
- Standard Welding — Automated + manual fine welding complying with API welding specifications
- Strict Testing — NDT inspection, hydrostatic test and air tightness test to eliminate defects
- Anti-Corrosion Treatment — Sandblasting and multi-layer coating for superior durability
- Factory Delivery — Complete inspection reports and compliance certificates for project acceptance
Application Scenarios
Our API 650 tanks serve mainstream industrial storage scenarios worldwide:
- Oil depots, petroleum reserve bases, terminals and pipeline stations
- Oil & gas field gathering and storage stations
- Petrochemical production, chemical and produced water storage
- Refinery finished oil storage areas
- Fuel storage for power plants and mining enterprises
- Commercial energy storage and oil logistics projects
Our Service Advantages
- Customized Solution — Free tailored design per capacity, medium, climate and seismic requirements
- Global Service — Familiar with international standards, supporting cross-border delivery and on-site guidance
- Full Lifecycle Support — Pre-sales consultation, production tracking and after-sales maintenance service
- Factory Direct Supply — No middlemen, high-quality and cost-effective
Get Your Custom API 650 Tank Solution
Get professional API 650 tank design, quotation and one-stop solution for your project. Contact us for customized industrial storage solutions now!
