Shijiazhuang Zhengzhong Technology (Center Enamel) is a premier China Welded Steel Oil Tanks Manufacturer specializing in API 650 & API 620 compliant storage. We provide shop-fabricated and field-erected solutions for crude oil, refined fuels, and petrochemicals. Utilizing high-grade ASTM A36 and Q345R steel with Internal Floating Roof (IFR) vapor recovery, our tanks ensure VOC emission reduction of up to 98% and a 30-year service life in global energy terminals.
Oil storage requires more than just containment; it requires adherence to rigorous mechanical benchmarks to ensure grid stability and environmental safety.
Our fabrication process is governed by international petroleum standards to ensure structural resilience under hydrostatic and environmental loads:
● API 650 Compliance: The global standard for atmospheric oil storage. We calculate shell course thickness and manway reinforcement to manage the immense pressure of bulk liquids.
● API 620 Compliance: Applied to large, low-pressure storage tanks requiring higher vapor-space integrity than standard atmospheric vessels.
● Metallurgy Excellence: We utilize ASTM A36 for standard service and Q345R Pressure-Vessel Steel for low-temperature or pressure-rated applications, ensuring superior impact toughness.
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Feature | Shop-Fabricated Oil Tanks | Field-Erected Storage Terminals |
Typical Capacity | 30m³ – 200m³: Ideal for regional distribution. | 500m³ – 50,000m³+: Bulk crude terminals. |
Primary Standard | API 650 / UL-142. | API 650 Appendix H / API 620. |
Roof Type | Fixed Cone or Self-Supporting Dome. | Floating Roof (EFR/IFR): For VOC control. |
Common Media | Diesel, Jet Fuel, Lubricants, Biofuels. | Crude Oil, Refined Fuel, Petrochemicals. |
Foundation | Concrete Pad or Steel Skid. | Ringwall Foundation with leak detection. |
In the petroleum sector, the "Total Cost of Ownership" is defined by the tank's ability to resist internal chemical attack and external environmental forces.
● Internal Protection: To prevent floor-side pitting from water bottoms and sludge, we offer High-Solid Epoxy linings and proprietary Glass-Fused-to-Steel (GFS) technology, providing an inert barrier immune to hydrocarbon corrosion.
● Seismic Resilience (ASCE 7): Every tank is engineered for site-specific GPS coordinates. Following API 650 Annex E, we provide specialized mechanical anchorage and flexible piping to ensure stability during earthquake events.
● Emission Control: Our Internal Floating Roof (IFR) systems float on the liquid surface, virtually eliminating the vapor space and preventing product evaporation loss, significantly increasing the ROI for refinery operators.
To ensure zero-leak performance, all critical welds undergo a rigorous Non-Destructive Testing (NDT) protocol:
1. Radiographic Testing (RT): 100% inspection of vertical seams to ensure zero volumetric defects.
2. Vacuum Box Testing: Verifies the leak-proof integrity of all floor plate lap-welds.
3. Dye Penetrant Inspection (DPI): Applied to nozzle-to-shell welds to detect surface-breaking fractures.
Q: What is the industry standard for welded steel oil tanks?
A: The global benchmark is API 650, which governs the design, fabrication, and installation of welded tanks for atmospheric oil storage.
Q: How do you prevent corrosion in crude oil storage?
A: We integrate high-grade carbon steel with High-Solid Epoxy linings and Cathodic Protection (CP) systems to mitigate both internal chemical attack and soil-side corrosion.
Q: Are your tanks suitable for hurricane-prone regions?
A: Yes. We engineer our tanks for site-specific Wind Loads (up to 250 km/h) according to ASCE 7 standards, utilizing reinforced wind girders for structural stability.
