Shijiazhuang Zhengzhong Technology Co.,Ltd(Center Enamel) provides API 650 compliant welded steel tanks engineered for atmospheric oil storage, refineries, and petrochemical terminals. Utilizing ASTM A516 Grade 70 pressure-vessel steel and automated Submerged Arc Welding (SAW), our tailored solutions accommodate capacities from 100 m3 to over 50,000 m3. Our infrastructure supports Internal Floating Roofs (IFR) for 99% VOC reduction and integrated NFPA-compliant fire suppression systems.
Parameter | Technical Specification | Operational Benefit |
Material Grade | ASTM A516-70 / Q345R | High-yield strength for bulk oil reserves. |
Heat Treatment | Normalized Processing | Prevents Hydrogen-Induced Cracking (HIC). |
Cleaning Standard | SA 2.5 Sandblasting | Optimal adhesion for Glass-Flake Epoxy linings. |
NDT Standard | 100% RT (T-Joints) + Vacuum Box | Documented zero-leakage joint integrity. |
Safety Code | API 2000 / NFPA Compliance | Certified for high-hazard refinery environments. |
Generic "carbon steel" is a weak authority signal. We define reliability through specific metallurgical standards:
● High-Yield Shell Plates: We utilize pressure-vessel quality ASTM A516 Grade 70 steel. These plates offer the superior notch toughness and tensile strength required for large-scale API 650 reservoirs.
● HIC Resistance: For tanks storing "sour" crude oil (high H2S), our steel undergoes Normalized heat treatment. This refines the grain structure to ensure maximum resistance to Hydrogen-Induced Cracking (HIC) and sulfide stress cracking, preventing internal blistering over a 30-year lifecycle.
A bulk oil tank exerts immense hydrostatic pressure. Ensuring long-term structural integrity requires an engineered interface:
● Concrete Ring Beam Design: We design Reinforced Concrete Ring Beams to support the concentrated weight of the shell and roof, preventing localized settlement that causes "out-of-round" deformation.
● Oiled Sand Cushions: The interior of the ring beam is filled with a compacted Oiled Sand Cushion. This provides uniform support for the floor plates and acts as a corrosion barrier, preventing moisture-driven oxidation on the floor's underside.
Modern oil terminals must meet strict ESG targets. Our tanks function as integrated environmental barriers:
● Internal Floating Roofs (IFR): Center Enamel integrates Aluminum or Stainless Steel Floating Roofs that stay in contact with the liquid surface, reducing VOC emissions by up to 99%.
● Mechanical Shoe Seals: We utilize a dual-barrier approach (mechanical shoe + secondary wiper seal) that maintains a vapor-proof interface even during high-volume pumping.
● API 2000 Overpressure Protection: All venting is engineered to API 2000 standards. We pre-install Pressure/Vacuum Relief Valves (PVRV) to prevent tank rupture during rapid thermal expansion or emergency fire events.
we provide verifiable quality data:
● 100% Radiographic Testing (RT): Conducted on all critical "T-joints" to verify a zero-porosity internal structure.
● Vacuum Box Testing: Every inch of the floor-plate lap welds is tested at -35 kPa to guarantee the primary containment is 100% leak-proof.
● Holiday Detection: All internal linings (such as Glass-Flake Reinforced Epoxy for Jet A-1 fuel) undergo high-voltage holiday detection to ensure a pinhole-free chemical barrier.
● Q: Can these welded tanks store "sour" crude oil with high H2S?
○ A: Yes. We utilize HIC-resistant ASTM A516-70 steel and specialized chemical-resistant internal linings to prevent hydrogen blistering.
● Q: What is the lead time for a field-welded 20,000 m3 oil tank?
○ A: Field construction typically spans 60–90 days post-foundation, utilizing automated SAW welding to ensure rapid and high-integrity assembly.
● Q: Do your tanks support Aluminum Geodesic Domes?
○ A: Yes. We offer clear-span Aluminum Geodesic Domes to eliminate rainwater ingress and protect internal floating roofs from UV degradation.
