PR - 2033
GRP Piping Systems
GRP piping systems are time tested because they have proven their durability and value in stony environments and brutal applications for decades. Following factors lead GRP pipes ahead from any other pipe.
- Long life:
It has a minimum life of 50 years. The smooth inside surface is maintained throughout the entire life of the pipe.
- Cost effective:
10 percent -15 percent cheaper than steel pipes & 20 percent-30 percent cheaper than pre-stressed cement concrete pipes.
- Light weight:
GRP pipes weights only 25 percent as much as similar steel pipe and 10 percent as much as similar concrete product. GRP pipes are light weighted, hence easier handling, faster installation and low transportation costs. The use of heavy equipment is practically eliminated.
- Installation benefits:
GRP pipes are easy to install due to its light weight. These can be manufactured upto 12m long to speed up installation and eliminates upto 75 percent of the joints compare to any other materials, hence handling & installation is easier then any other product. GRP pipes are light weight, and as such results in less expensive installation, labour and machinery expenditures.
- Dimension stability:
GRP piping system can maintain the critical tolerances required of the most demanding structural and piping application. The materials need the most stringent material stiffness, dimensional tolerance.
- Strength to weight ratio:
The GRP pipe has excellent strength to weight properties. When the ratio of strength per unit of weight is considered, GRP composites surpass iron, mild steel, HDPE and PVC.
- Very low friction factor:
Value of 'C' in Hazen Williams equation for calculation head loss due to friction in pipes is 150-160 for GRP pipes against 120-130 for steel pipes. Thus, the low friction coefficient and the hydraulic characteristics of GRP pipes lead to significant saving in pumping costs.
- Lower pumping cost:
The low friction factor results in lower pumping cost, GRP provides high flow rates and reduce pumping cost due to large bore and smooth internal surface. Thus saving huge energy cost during the life cycle of the pipe.
- Low maintenance cost:
No maintenance cost throughout the life because of absence of corrosion, zero replacement.
- Corrosion resistance:
GRP piping system is resistant to corrosion both inside & outside. These pipes has been used for handling dilute acids, saturated brine, organic solvents and other corrosive chemical but there is zero corrosion as result additional lining and exterior coating are not required.
- Smooth inside surface:
The smooth interior of GRP pipe results in low fluid resistance, which could lower horse power requirements for pumping systems. This characteristic could contribute to a substantial cost savings over the life of a typical piping system. The interior pipe surface remains smooth over time in most fluid services. Therefore fluid resistance does not increase with age. The smooth interior allows the pipe diameter to be reduced while maintaining the desired flow.
GRP pipe is OD compatible with DI, CI & pre-stressed cement pipe. In addition to DI, CI fittings, GRP couplings / GRP flanges can be used to join pipe directly to these materials.
- Fire resistance:
GRP offers versatility in design and can be made fire resistant by proper selection of resin system.
- Excellent fatigue resistance:
Under cyclic loading GRP provides very high resistance to fatigue which enhances its performance for longer life.
- Low thermal conductivity:
Low thermal conductivity of GRP pipe not only causes low temperature losses but also in many cases eliminates condensation or the need for additional thermal insulation.
GRP Pipe Composition:
- Inner liner:
Liner or chemically resistant layer is the internal layer of the pipe. It is in direct contact with the conveyed fluid. This layer has the function to guarantee the resistance to the chemical corrosion and the impermeability to the pipe. The liner is made of two monolithic sub layers. The inner one, in direct contact with the fluid, is reinforced with glass veil, with a resin content of 90 percent and the outer one is reinforced with CSM glass, with a resin content of 70 percent by weight. The standard liner thickness is about 0.5 to 1.2 mm, higher thickness can be produced on request or as per design requirement.
- Structure wall:
Glass reinforced layers guarantee the mechanical resistance of the whole pipe against stresses due to internal and external pressure, external loads and thermal loads. For GRP pipes, this layer is obtained by applying on the previous partly cured liner, continuous roving of glass wetted with resin, under controlled tensioning. For GRP pipes, the structural wall is wound directly on a wet liner. This layer can contain aggregates like silica sand in order to increase the stiffness of the whole pipe. Thickness of the mechanical resistant layer depends on the design condition.
- External liner:
Top coat or external liner is the outer layer of the pipe which consists of pure resin added with UV protectors to protect the pipe from sun exposure. In case of severe exposure condition like aggressive soils or very corrosive environment, the external liner can be reinforced with a surfacing veil or added with fillers or pigments.