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FRP Tanks / FRP Vessels

Nirmala Polymer Industries, Offers Storage tanks, which are available in capacity ranging from 1m3 to 200m3. Beyond this, We Manufacture at Customer’s site, considering the high handling and transportation costs.

A typical storage tank made of FRP has an inlet, an outlet, a vent, an access port, a drain, and an overflow nozzle. However, there are other features that can be included in the tank, accessories like, ladder, railing, float type level indicator, Lifting Hooks, Lugs for mounting Vertical Tank on I-Beam Support, etc. as per customer's specifications. Ladders on the outside allow for easy access to the roof for loading. Sloped bottoms allow for easier draining. Level gauges allow someone to accurately read the liquid level in the tank. The vessel must be resistant to the corrosive nature of the fluid it contains by selecting the appropriate grade of Resin or Liner.
 
Single Composite / Dual Laminate Tanks
Due to the corrosion resistant nature of FRP, the tank can be made entirely from the composite (i.e Completely FRP), or a second liner can be used. In either case, the inner liner is made using different material properties than the structural portion (Hence the name dual (meaning two) and laminate (a word commonly used for a layer of a composite material)).

The liner, if made of FRP is usually resin rich and utilizes a different type of glass, called "C-Glass", while the structural portion uses "E-Glass". The thermoplastic liner is usually 2 and 3 mm thick (100 mils). This thermoplastic liner is not considered to contribute mechanical strength. The FRP liner is usually cured before winding or lay-up continues or using an MEKP catalyst with cobalt in the resin.

If the liner is not made of FRP, there are multiple choices for a thermoplastic liner. The engineer will need to design the tank based on the chemical corrosion requirement of the equipment. PP, PVC, PTFE, ECTFE, ETFE, FEP, CPVC, PVDF are used as common thermoplastic liners.
Due to FRP's immense strength against tensile forces and its resistance to corrosion, a hydrostatic tank is a logical application for the composite. The tank is designed to withstand the hydrostatic forces required by orienting the fibres in the tangential direction. This increases the hoop strength, making the tanks anisotropically stronger than steel (pound per pound).

FRP which is constructed over the liner provides the structural strength requirements to withstand design conditions such as internal pressure or vacuum, hydrostatic loads, seismic loads (including fluid sloshing), wind loads, regeneration hydrostatic loads, and even snow loads.
 
Types
FRP Vessels and Tanks are used in multiple applications, requiring a strong, corrosion resistant environment. Considering the Working, atmospheric conditions, space constraint and other Technical aspects, the Tanks are manufactured as Cylindrical (Vertical / Horizontal) with Flat, Conical, Dish-End Top / Bottom or Rectangular.
 
Applications
FRP tanks and vessels designed as per BS 4994 are widely used in the chemical industry in the following sectors: chlor-alkali manufacturers, fertilizer, wood pulp and paper, metal extraction, refining, electroplating, brine, vinegar, food processing, and in air pollution control equipment, especially at municipal waste water treatment plants and water treatment plants and other areas where the corrosion is the major factor.
 
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