GRP Filament-wound Tank
Aboveground Cylindrical Horizontal or Vertical Storage tanks are single-walled, manufactured to ASTM D 3299 Standards by Filament-wound process. Size range from 1000-liter to 120,000 liter capacity
Brief Description of the Filament-Winding Process
The mandrel (cylindrical mould) is wrapped with a mylar film (separating agent) and coated with liner resin system. Then, a strip of 200mm width of surface viel, “C” glass type, is wound around the mandrel and impregnated with the same material (liner). This is done by pumping it on a wool roller directly attached to the rotating mandrel, and trapped air are “squeezed off”. It is then allowed to dry before the next step is employed. This layer becomes the innermost layer of the tank wall in contact with the stored liquid. This is called the corrossion-barrier layer, and serves to protect the inner structural reinforcements from being penetrated by the stored liquid. This layer is considered vital to the total make-up of the tank, hence, failure of this layer is considered failure of the tank. Once the corrossion-barrier layer has gelled, the structural reinforcements are wound on a helical and normal pattern. The number of normal and helical winding are so designed and constructed to satisfy loading requirements
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Aboveground Horizontal Filament-Wound tanks with solid stiffening Ribs – to ASTM D 3299 Standard Large-Capacities – up to 120,000 liters
The density of the tank shell is approximately, as follows:
With Glass-to-resin ratio of 60:40 % by weight:
1 1
D = —————— = ——————— = 1.76 g/cc
wf wr 0.60 0.40
—— + —— ——— + ———
Df Dr 2.56 1.20
Where : D = density of laminate, Wf = weight fraction of fibers,
Df = Density of fibers , Wr = weight fraction of resin, Dr = density of resin
Standard Sizes for FW-Tank
| Capacity, Liters | Cylinder Length | Cap Height | Diameter |
| mm | Ø | ||
| 1,181 | 2,400 | 200 | 1200 |
| 13,626 | 4,000 | 200 | 2000 |
| 19,601 | 4,000 | 350 | 2400 |
| 28,649 | 6,000 | 350 | 2400 |
| 45,115 | 6,000 | 400 | 3000 |
| 87,526 | 12,000 | 400 | 3000 |
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Vertical Filament-Wound Tanks Depending on the customer’s intended application, suitable resin type can be selected. Tanks which are installed in the open is coated with UV-Inhibited topcoat. Inareas where tanks are subjected to high wind, a special anchoring device inserts are required Vertical flat bottom tank should be installed on a base that can provide a continuous support and having sufficient strength to support the weight of the tank full of liquid with negligible deflection. For dished-bottom tank, a special support system is required. |
| Large-Capacity Vertical Tanks with solid stiffening ribs. High-rise vertical tanks can be designed to withstand high wind loads. |
Filament-wound GRP Cylindrical Horizontal Tank – one-piece construction, no bolts and nuts joints – made by continuous filament-wound process. Ideal for industrial application. Manufa- ctured to ASTM D 3299 Standard. |