Aluminum Dome Cover

• What is Aluminum Dome Cover?
• Applicable Areas
• Product Composition
• Installations

Material Characteristics of Aluminum

• 01Strong anti-corrosion
• Aluminum reacts to oxygen in the air and forms thin dense oxide film (Al2O3) on the surface to prevent the progress of corrosion.

• 02Reflect 70% to 90% of sunlight for excellent heat shielding

• 03It is very light with the specific gravity as one-third of general steel and its yield strength is similar.
• 04Its color is beautiful compared to other materials.
• 05It is not affected by UV (Ultraviolet Rays).

Constructional Characteristics of Aluminum

Advantage of Aluminum Cover

Aluminum Cover의 장점

Economics	The automated production for standardized components helps the low labor cost, the easy installation of light weight structure, and the shortened period of construction for overall low manufacturing and installation cost. Especially, considering the unique semi-permanent duration period of aluminum, it is an economic material compared to any other material.
Maintenance, Management and Repair	Aluminum reacts with oxygen in the air to form thin dense oxide film on the surface and prevents the progress of corrosion, so that it is rarely required of the cost for maintenance and management. The product has been standardized for easy disassembly, assembly and light weight for easy fast renovation and repair work.
Durability	Aluminum rarely experiences the progress of corrosion. It holds excellent durability with its dead load as one third of general steel but similar yield strength.
Heat Absorbency	Aluminum alloy is used for the cover material with very little heat absorbency and high reflection of solar heat to minimize the internal temperature of a pond in the sewage treatment plant where an optimum temperature is required. It has been used widely for sewage treatment plant or wastewater treatment plant in advanced countries. It is available to maintain the optimum condition for the growth of microorganism to process sewage.
Appropriateness for Sewage Treatment Plant	- The material structure of aluminum alloy is highly appropriate for the cover of sewage treatment plant with its fair durability to maintain the initial strength. - Its excellent durability is suitable for the cover to prevent the odor. Especially, it is strong in anti-corrosion against main odors of hydrogen sulfide (H2S), ammonia gas (HN3), and Mercaptan. - Aluminum alloy is easy to manufacture and install with its light weight suitable to accomplish the goal of playing a role of the cover for sewage treatment plant. - Aluminum alloy is not affected by UV at all. It is resistant to the change in the inner temperature of a tank under any external temperature condition for the protection of microorganism to remove the causes that may generate the order. - It is easy to manufacture or assembly, and install the passage freely to inspect the sewage treatment plant such as equipment inlet, door, manhole in dome cover.

Manufacturing & Installation Process of Aluminum Cover

• 01. Actual Field Survey
• 02. Design
• 03. Material Warehousing

• 04. Assembly Installation

Design Condition

Comparison of Cover Materials

Cover의 재질 비교표

	Aluminum	FRP	Film	Polycarbonate
Yield Strength	Aluminum Panel : 145 N/mm2 Aluminum Frame : 245 N/mm2	103 N/mm2	40~70 N/mm2 (Tensile Strength)	Polycarbonate Panel : 50 N/mm2 Steel Frame : 245 N/mm2
Material Specific Gravity	2.7	1.6 ~ 2.0	1~1.5 kg/m2	Polycarbonate : 1.2 (Steel Frame : 7.8)
Durability Period	More than 60 years (semi-permanent)	10 to 15 years	5 to 15 years	10 to 15 years
Inflammable	Non inflammable	Flammable	Flammable	Flammable
Anti-corrosive	Strong (Formed self oxide film)	Weak (Needed regular coating)	Weak	Weak
Air Tightness	Fair	Fair	Weak	Fair
Maintenance & Management Cost	Semi-permanent with nearly no maintenance and management cost	Necessary regular coating for UV shield	Necessary exchange due to the generation of rust, discoloration, and crack affected by UV (Short duration period)	Panel: Necessary regular maintenance and repair due to the corrosion by UV & hazardous gas Steel Frame: Necessary coating, maintenance and repair due to corrosion
Heat Shielding	Aluminum with its high heat shielding is able to minimize the change of inner temperature of sewage treatment plant by external temperature. The inside of tank is kept cool in summer and for a proper temperature in winter.	Due to its low heat shielding, it is sensitive to external temperature and the temperature inside the tank of sewage treatment plant fluctuates, so that it requires a separate equipment to maintain the temperature.	Very high heat absorbency may cause the suffocation of microorganism due to the increased inner temperature of aeration tank or sludge thickener	It causes the greenhouse effect to raise the inner temperature rapidly. It requires a separate equipment to maintain the temperature.
Diversity	Assembly structure for diverse manufacturing to the shape	Available for various shapes and colors	Assembly structure to assemble by shape	Various manufacturing to the structure of frame
Durability	Strong	Normal	Weak	Steel frame is strong but polycarbonate is weak.
Process	Relatively short for the type to assemble each part	More or less long for manual work	More or less long for manual work	More or less long for manual work
Eco-friendly	Eco-friendly for recycling after the end of durability period	Necessary high treatment cost due to the generation of industrial waste after the end of durability period	Necessary high treatment cost due to the generation of industrial waste after the end of durability period	Necessary high treatment cost due to the generation of industrial waste after the end of durability period
Application of Span	Available to apply aluminum itself to the span	Necessary separate steel frame	Necessary separate steel frame	Necessary separate steel frame
Light Penetration	Installation of skylight available to adjust the light penetration by the demand of a user	5%	7~13%	Available to adjust the light penetration