Shijiazhuang Zhengzhong Technology (Center Enamel) is a premier China Welded Steel Ground Storage Tanks Manufacturer, specializing in large-scale liquid containment engineered to API 650, AWWA D100, and GB 50128 standards. Our welded tanks feature precision-welded carbon or stainless steel plates, providing a permanent, leak-proof solution for petroleum, municipal water, and industrial chemical storage with a design life exceeding 30 years.
The reliability of a welded storage asset depends on the rigor of the fabrication process. Center Enamel integrates elite welding certifications with multi-layered inspection protocols.
Technical Parameter | Engineering Standard | Functional Benefit |
Welding Certification | AWS / ASME Section IX | Ensures 100% joint fusion and ductility. |
Non-Destructive Testing | RT, UT, PT, Vacuum Box | Zero-leak integrity verification. |
Material Grades | ASTM A36, A516 Gr. 70 | High notch toughness and stress resilience. |
Seismic Design | ASCE 7-22 | Survival in Seismic Categories D, E, and F. |
Coating Standards | ISO 12944 (C3-C5) | 30+ year protection in corrosive environments. |
To guarantee a 100% leak-proof structure, we employ a multi-layered inspection regime:
● Radiographic Testing (RT): Spot or 100% X-ray inspection of all critical butt welds to detect internal discontinuities.
● Vacuum Box Testing: Strictly applied to floor plate lap welds and bottom-to-shell seams to identify microscopic leaks.
● Dye Penetrant Testing (PT): Used on nozzle attachments and complex corner joints to ensure surface integrity.
For high-capacity containment (>10,000m³), welded steel provides a superior return on investment through durability and speed.
Feature | Center Enamel Welded Steel Tanks | Traditional Reinforced Concrete |
Containment | 100% Impermeable: Fusion welded. | Porous: Risk of capillary seepage. |
Seismic Response | Ductile: Flexes under ground load. | Brittle: High mass increases cracking risk. |
Construction | Rapid: Pre-fabricated modular plates. | Slow: Requires 28-day curing & formwork. |
Hygiene | Non-Porous: NSF/ANSI 61 certified. | Porous: Potential for biofilm accumulation. |
Sustainability | 100% Recyclable: High scrap value. | Waste-Heavy: High demolition impact. |
We adhere to the most stringent international design codes to simplify local permitting and insurance underwriting for our clients.
● API 650: The global benchmark for oil and chemical storage, ensuring the tank handles internal hydrostatic pressures and product density safely.
● AWWA D100: The definitive standard for welded carbon steel water tanks, focusing on potable water safety and long-term structural stability.
● ASCE 7-22: Every tank is engineered for site-specific environmental actions, including extreme wind loads (up to 250 km/h) and hurricane-zone anchoring.
● NSF/ANSI 61: Our internal lining systems are certified for potable water, ensuring zero leaching of VOCs or heavy metals.
1. Absolute Integrity: Unlike bolted tanks or concrete, the monolithic nature of an API 650 welded tank eliminates gasket failure risks and ensures zero leakage for hazardous materials.
2. Climate Resilience: With the rising frequency of extreme weather, the ductile nature of ASTM A516 Grade 70 steel allows our tanks to withstand seismic forces and thermal fluctuations that would rupture brittle concrete.
3. Total Cost of Ownership (TCO): While the initial labor for welding is higher than bolting, the 50-year service life and minimal maintenance requirements result in a significantly lower lifecycle cost.
Q: What is the benefit of a welded steel tank over a bolted tank? A: Welded tanks offer superior structural integrity for extreme volumes and high-temperature media. They eliminate gasket maintenance and are preferred for petroleum and hazardous chemical containment.
Q: Can welded tanks be used for drinking water? A: Yes. When finished with NSF/ANSI 61 certified internal epoxy or phenolic linings, they provide a permanent, high-volume solution for municipal reservoirs.
Q: How do you ensure the quality of field-welded seams? A: We employ certified NDT inspectors who perform visual and X-ray testing on load-bearing welds to ensure a 100% fusion bond per ASME Section IX.
