Fibreglass Covers & Hoods
Fibreglass covers and hoods for covering tanks and other equipment to contain and collect odours and noxious gases. Covers and hoods are the first part in any odour control project.
Fibreglass is corrosion resistant, lightweight and strong, so is ideal for covers.
Stiffness is usually achieved by incorporating either curved surfaces or stiffening members.
Segmented barrel vault design is ideal on large diameter round tanks such as clarifiers and sludge thickeners. Multiple segments are made so that each section is able to be manufactured, transported and installed easily. The segments can also be removed at any time in the future. The segments are landed on the outer tank wall, and on an inner compression ring in the centre of the tank.
Flat tank covers are used when there are equipment clearance requirements, and when personnel access is needed. Stiffening ribs are then incorporated on the underside of the covers.
Covers can be made to any degree of airtightness. However a key part of any odour and noxious gas capture project is to duct the gases away for treatment. To do this air must be introduced into the tank in a controlled way.
Covers can be made to be totally air tight, with gaskets and bolted joints. In this case purpose built openings and vents must be incorporated into the cover to allow fresh air to enter and replace the gases being taken away. These vents must be sited correctly to set up the right cross drafts and not allow any odourous or noxious gases to escape.
Another approach is to NOT make the joints between cover segments totally air tight. Then fresh air is able to enter the tank in a lot of small random places once the tank and cover are under a negative suction pressure.
Plastic strip curtains and air curtains can be incorporated into the edges of hoods to contain gases, but allow operator access.
The amount of air that needs to be evacuated from under a cover in order to totally capture gases depends on a large part on the area of openings to the atmosphere. Thus the amount of air to be moved and treated can be minimised by keeping the area of openings as small as possible. As a general rule of thumb, the air velocity through any openings needs to be kept to between 0.5 and 1.0 metres per second to ensure capture.
Fibreglass hoods and covers can be coloured externally to any colour required. This enables plant to be colour coded for operator convenience and safety.
USES
•Thickeners and clarifiers
•Conveyor belts and transitions
•Pulp and paper pulp washers
•Fertiliser processing covers
•Wastewater treatment grit tanks
•Food industry cookers and driers
•Rendering plant cookers and equipment
•Electrical transformers
•Metal treatment tanks
Back to FIBREGLASS PRODUCTS Section Page
Back to HOME page for All Products
|