Shijiazhuang Zhengzhong Technology (Center Enamel) is a premier China Oil Storage Tanks Manufacturer specializing in API 650 and API 620 compliant solutions. We provide shop-fabricated and field-erected welded steel tanks for crude oil, diesel, jet fuel, and petrochemicals. Utilizing high-grade ASTM A36 and Q345R carbon steel with advanced internal epoxy linings, our tanks are engineered for a 30-year service life. Featuring Internal Floating Roofs (IFR) for 98% VOC emission reduction and ASCE 7 seismic-rated anchorage, Center Enamel supports global energy infrastructure with NDT-verified containment security.
In the high-stakes energy sector, structural reliability is non-negotiable. Our engineering team prioritizes international design codes to ensure zero-leak performance.
● API 650 (Atmospheric Storage): The global benchmark for crude oil and diesel storage. Our designs handle internal pressures up to 2.5 PSI (17.2 kPa), ensuring stable containment at atmospheric conditions.
● API 620 (Low-Pressure Storage): Engineered for products with higher vapor pressure management needs, supporting internal pressures up to 15 PSI (103.4 kPa).
● Steel Selection: We utilize specialized grades including ASTM A283 Grade C for shells and ASTM A537 Class 1 for high-strength requirements.
● Variable Design Point (VDP): Plate thickness is calculated based on maximum hydrostatic pressure at the tank base, optimizing material efficiency while ensuring safety for specific gravity variations in hydrocarbons.
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Feature | Welded Steel Oil Tanks (API 650) | Traditional Concrete Containment |
Permeability | Zero: Non-porous metallic barrier. | High: Porous; subject to "wicking." |
Vapor Management | Advanced: Supports IFR/EFR systems. | Incompatible: High evaporation loss. |
Seismic Resilience | Superior: Ductile steel with ASCE 7 anchorage. | Poor: Brittle; high risk of cracking. |
Asset Life | 30–50 Years (with CP protection). | 20–30 Years (prone to rebar decay). |
Maintenance | Predictable: API 653 inspections. | Complex: Hard to detect internal leaks. |
Center Enamel integrates multiple layers of protection to survive aggressive environments and preserve product specifications.
● Sacrificial Anodes: Cost-effective zinc/magnesium anodes for smaller terminals.
● Impressed Current (ICCP): Real-time monitored DC power systems to ensure the steel floor remains electrochemically inert against soil salinity.
We apply solvent-free, high-build epoxies specifically rated for the asset type:
● Jet Fuel Purity: Linings that prevent metallic contamination to meet international "Into-Plane" cleanliness standards.
● Sour Crude Resistance: Robust barriers against Microbially Induced Corrosion (MIC) and acid attack in high-sulfur environments.
● 100% Radiographic Testing (RT): X-ray inspection of all vertical shell seams ensures 100% joint efficiency.
● Vacuum Box Testing: Verification of every inch of floor-to-shell welds to identify microscopic leak paths.
● Field Erection Supervision: We provide expert on-site supervision in the Middle East, SE Asia, and Africa, ensuring field assembly adheres strictly to API safety protocols.
Q: What is the standard design life for a Center Enamel oil tank?
A: Our tanks are engineered for a 30-year service life when maintained to API 653 standards, utilizing site-specific seismic engineering and advanced coatings.
Q: How do you ensure zero-leak performance?
A: We utilize a 100% NDT suite, including radiographic testing of shell seams and vacuum box testing of the tank floor before commissioning.
Q: Can these tanks be used for high-viscosity products like asphalt?
A: Yes. We provide custom-integrated heating coils (steam or electric) and specialized insulation systems to maintain required process temperatures.
