The use and advantages and disadvantages of FRP grating

The purpose of glass reinforced plastic grille

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Glass fiber reinforced plastic (FRP) grid, also known as glass steel grid plate, is a kind of glass fiber reinforced material, unsaturated polyester resin as the matrix, after special processing composite material with a lot of space, glass steel grid plate has the advantages of light weight, corrosion resistance, easy installation, safe use. It is widely used in urban construction, chemical industry, power industry, paper industry, Marine exploration, sewage treatment and other industries of the working platform, equipment platform, drilling platform, corridor and so on. FRP grille can be used as a structural material for floors, trench covers, platforms, ship decks, stairs, trestles and so on in corrosive environments. With corrosion resistance and flame retardant, no magnetic insulation, color s bright sample, a variety of styles and forms of alternative features. The grille is made of glass fiber crisscrossed, resin pouring and moulded as a whole. The grille plate with many regular rectangular and square Spaces is produced, and has bidirectional homogeneity mechanical characteristics.

 

The advantages of FRP grating

· Corrosion resistance:It has excellent corrosion resistance of acid, alkali, organic solvent and salt and many other gas and liquid media, and has incomparable advantages in the field of corrosion resistance. According to the requirements of the actual use occasions, the use of o-benzene type, m-benzene type, vinyl type resin can be economically selected as the matrix material.

· Light weight and high strength: The density of fiberglass grating is not more than 2, only 1/4 of steel and 2/3 of aluminum. Its strength is 10 times that of rigid PVC, and its absolute strength exceeds the level of aluminum and ordinary steel.

· Aging resistance: Service life of more than 50 years.

· Flame retardant: The flame propagation rate of common flame retardant grille (ASTM E-84) shall not exceed 25; The flame propagation rate of advanced flame retardant vinyl grille does not exceed 10. Oxygen index not less than 28 (GB ).

· Safety:Excellent electrical insulation, no breakdown under 10KV voltage; Non-electromagnetic, can be used in magnetic sensitive equipment; The special structure of FRP grating also has the characteristics of anti-slip, anti-fatigue and so on.

· Easy installation:This kind of product is very simple to install, not only reduces the worker's work intensity, but also does not need to use lifting equipment.

· Comprehensive economic benefit is good:Compared with ordinary carbon steel, FRP grille comprehensive cost is low, although its one-time investment is higher than ordinary carbon steel, because of its long service life, generally can be used for twenty years, and no maintenance, so its comprehensive economic benefit is much better than the use of carbon steel.

The disadvantages of FRP grating

Strictly speaking, there is only one shortcoming, and this shortcoming is also a common problem of all FRP products, that is, there is no value of recycling. Although the performance of the product is almost perfect in all aspects, it is difficult to reuse. After defining the advantages and disadvantages of a product, how to turn the disadvantages into advantages of a product is a key problem. In this paper, we summarize how to turn the disadvantage of the grille plate without recycling value into the advantage in the application. When FRP grille board is used in urban greening, as a tree grate (i.e., tree protection board), the disadvantage of no recovery value can naturally turn into an advantage. Glass fiber reinforced plastic cover plate is also widely used as a car wash grille.

 

Application of FRP grating

· Water treatment: maintenance walkway, drain cover plate, large container, washer, trap, flume, biochemical water treatment pool hanging tool, ventilation window, stairs, cooling tower operating platform pavement;

· Chemical plant: stairs, operating platform, guardrail, double floor, trench cover plate, filter grid;

· Petroleum industry: Offshore oil platforms;

· Textile factory: replace metal grille, wooden platform and cover cement floor, next to dyeing tank, floor, near this valve, etc;

· Power plant: chemical water workshop trench cover plate, waste water pool, etc;

· Metal surface treatment: replacement of wood flooring around the machine, around highly corrosive containers, electroplating line walkways, double floors;

· Marine food processing plant: smooth surface and other harsh environment, ships;

· Transportation: platform, ship deck, walkway, military minesweeper, stair deck;

· Beverage industry: stair floor, replace expensive stainless steel, loaded floor;

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· Pulp and processing plants: stairs and floors, floor walkways, high humidity places;

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· Electronics industry: trench cover plate, pickling workshop, anti-static (anti-static grid) and high cleanliness workshop;

· Meat processing plant: easy to corrode the ground, stairs, greasy floor work table and stairs;

· Car wash/car beauty shop: car wash drainage board, parking space, car wash trench cover plate;

· Crane :3 meters or 6 meters long crane walkway;

· Others: corrosion-resistant shelves, decoration, square fountain, scaffolding, civil building facilities, aquaculture fencing and double floors, etc.

 

 

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Advantages and disadvantages of various grille materials

1) PP polypropylene is the most popular material at present. The material is very resistant to various acids and bases, including the strong acid hydrofluoric acid. However, the operating temperature range is relatively narrow. Often can only withstand a short period of 70 &#;. The high temperature filter plate is an acid-resistant and temperature-resistant organic material. Generally, the temperature resistance can reach about 150 °C, but the alkali resistance is very poor. 

2) The membrane filter plate has good elasticity, and the moisture content of the filter cake has dropped below 30%. 

3) The rubber filter has the characteristics of acid and alkali resistance, high temperature resistance and strong sealing performance.

4) Aluminum filters, among all metal filters, are relatively light in weight, but relatively poor in acid resistance.

5) Cast iron filter screen, heavy weight, poor acid resistance, but temperature resistance. 

6) Stainless steel filter plate has good acid and alkali resistance, but the price is higher among all filter plates, because the price of raw materials is high and the machining time is long. 

There are several uneven small dots on the filter press grid, these small dots not only improve the filtration and dewatering capacity of the template filter, but also speed up the flow rate of the equipment, shorten the filtration cycle, and greatly improve the efficiency of the template filter. work efficiency. 

During the working process of the filter press grille, the filtrate flows freely, usually along the water channel to the surroundings. The existence of the bumps reduces the flow time of the filtrate and greatly improves the filtration speed. 

The bumps on the filter plate further increase the filter area, make the filter performance of the filter press grid reach a stable state, protect the filter cloth from damage, and prolong the service life of the filter press grid.

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