Aluminum geodesic dome roofs provide a 100% corrosion-resistant, self-supporting cover solution for wastewater and crude oil tanks. By utilizing a triangular space-truss geometry, these structures eliminate the need for internal columns, maximizing storage volume and reducing lifetime maintenance costs by up to 90% compared to traditional steel roofs.
Shijiazhuang Zhengzhong Technology Co., Ltd (Center Enamel) is a premier global manufacturer, delivering advanced clear-span
To satisfy the technical intent of engineering procurement, our domes are manufactured to the following international specifications:
Component / Standard | Technical Specification | Compliance Authority |
Primary Structure | 6061-T6 High-Tensile Aluminum Alloy | ADM 2015 (Aluminum Design Manual) |
Closure Panels | 3003-H14 or 5052-H32 Aluminum | ASTM B209 / API 650 G |
Design Standard | Spherical Triangulated Space Frame | AWWA D108-19 / API 650 |
Fasteners | 7075-T73 Aluminum / 300 Series SS | API 650 G.2.4 |
Sealants / Gaskets | Silicone / EPDM (UV & Ozone Resistant) | ASTM C509 |
In municipal wastewater treatment, the headspace of sludge tanks is a highly corrosive micro-climate.
● The Biogenic Threat: Anaerobic activity produces Hydrogen Sulfide (H2S) gas. When this condenses on traditional covers, sulfur-oxidizing bacteria convert it into sulfuric acid (H2SO4), leading to rapid "concrete rot" and steel degradation.
● The Aluminum Solution: Our 6061-T6 alloy naturally forms a dense, self-healing oxide layer that is chemically inert to H2S and sulfuric acid. This provides a total, non-reactive seal that protects the tank's structural perimeter and ensures odor control compliance.
For refineries and terminals, the aluminum dome acts as a critical tool for Emission Control.
● Secondary Seal Function: The dome blocks wind flow over the Internal Floating Roof (IFR), the primary driver of Volatile Organic Compound (VOC) "wicking" or vapor loss.
● Vapor Pressure Management: By shielding the product from direct solar radiation, the dome reduces internal vapor pressure, lowering the volume of VOCs that require flaring or recovery.
In an era of climate volatility, our domes are engineered for Passive Structural Stability:
● Wind Load Resistance: Designed to withstand sustained winds of up to 200 km/h (Category 3+ hurricane equivalent).
● Snow & Live Loads: Capable of supporting uniform loads up to 2.5 kN/m2 via the triangulated truss system.
● Seismic Resilience: High strength-to-weight ratio ensures low mass-inertia, ideal for Seismic Intensity Zones 7-9.
● Thermal Expansion: Integrated sliding "shoe" supports allow the dome to expand and contract (-40C to +80C) without stressing the tank shell.
Center Enamel recently completed a benchmark installation in Saudi Arabia, showcasing the dome's performance in arid, high-temperature environments.
● Total Volume: 11,020 m3 across 5 units ( 24.06 x 4.85m).
● Thermal Performance: The high-albedo 3003-H14 panels reflect solar radiation, keeping internal sludge temperatures stable during extreme +50C heat.
● Logistical Advantage: Lightweight modular components were shipped in high-density containers and assembled on-site without heavy lifting equipment.
Q: Can aluminum domes be retrofitted onto existing tanks?
A: Yes. Since aluminum is 1/3 the weight of steel, these domes can typically be installed on existing concrete or steel tanks without requiring foundation reinforcements. Installation is often possible in-service.
Q: What is the maximum span available?
A: Our modular engineering allows for clear spans exceeding 120 meters without internal columns, maximizing usable volume for large-scale reservoirs.
With nearly 200 patents and certifications including ISO9001, NSF61, and ISO28765, Center Enamel is the most experienced bolted tank and cover manufacturer in Asia. We don't just provide a roof; we provide a long-term engineering solution for environmental protection and operational safety.
