GRP pipe can be fabricated in various ways. The following is GGT standard for the fabrication of GRP pipes.
Filament wound method is generally used to produce GRP pipe.

Merit of GRP Pipe

The FRP is a widely proved composite material with high strength and corrosion resistance.

• Corrosion Resistance
  Both the inner and outer surfaces of the FRP pipe are corrosion resistant, eliminating the need for a lining process.
• Strength to Weight Ratio
  The specific strength of the FRP pipe exceeds that of steel and stainless steel
• Light Weight
  Fluidity in the FRP pipe is excellent because of small resistance and coefficient of friction (C=150), reducing the pumping cost. The inner surface is rarely worn by any possible sands or gravel.
• Size Variety
  The FRP pipe is available from 15 mm to 2.5 m in diameter. The standard lengths supplied are 6, 9, and 12m.
• Low Thermal Conductivity
  The FRP pipe has low thermal conductivity, saving the cost of heat insulation.
• Low Thermal Expansion
  The FRP pipe has low thermal expansion, lowering deformation and the number of expansion joints required.
• FDA Compliance
  The FRP is made of the certificated materials from FDA, so that the pipe can be used in applications for drinking water.

Applications

The FRP pipe requires no regular maintenance, allowwing any above ground, under ground, and subaqueous applications. Do you have to check and repair your steel pipes Just replace them with the FRP pipes, which is serviceable semi-permanently

• Sea Water intake & Outfall Piping
• Circulation piping for coling water
• industrial alpplicated food Processing
• Chemical transfer rocessing
• Potable & Sanitary Piping
• Chlorination piping
• Sewage piping

Fabrication of GRP Pipe

GRP pipe can be fabricated in various ways. The following is GGT standard for the fabrication of GRP pipes. Filament wound method is generally used to produce GRP pipe.

A. Filament Wound

Filament winding is processed as following: First, roving is immersed into resin. And wind it continuously on rotational structure called "mandrel" (normally spiral way) Filament winding is used to fabricate pipes similar to tubes. And, fiberglass roving strand is impregnated into liquid thermosetting resin and wound on the rotational axis which has special pattern(Generally, angle is 54.5° )
The most outstanding characteristics of filament winding products is that the mechanical stiffness is very high and the capability of absorbing impact energy is great.

Resins are 30~40% because stiffness is regarded as very important factor for pressure vessel, pressure pipe and tank, etc. This is depended on resin volume, winding angle. Thus, fabrication method should be selected appropriately considering it's use.

Surface veil or chopped strand mat are used inside of filament-wound pipe to enhance resistant power against corrosion.

B. Hand Lay-up

Hand Lay-up is a way of lamination by laying resin and glass fiber alternatively on mold until lamination thickness reaches to some point.

This method is used to fabricate fittings and it has advan -tage of getting various form and shape by laminating using glass fiber, chopped strand mat and roving cloth in orderly manner, And, even complicated shape also can be obtained.
It is very important to eliminate bubbles during lamination and in order to complete lamination structure, segregation is performed manually with rollers and resin is used to be 60~70% of total volume.

Physical properties can vary depending on the mixing ratio between roving cloth and chopped strand mat.

Thickness formation of GRP Pipe

GRP pipe is used for a system requiring highly non-corrosive and very strong stiffness. And, due to it's structure, it has very long life time, almost forever. Basic material(resin) and supporting material (glass fiber) are used reasonably and this structure makes the lifetime very long with high stiffness. Especially, GRP pipe can be fabricated appropriately according to liquid and system by selecting proper resin and fabrication method for best service with the system.

• Liner Layer
  C-glass fiber is used so it has excel -lent non-corrosion property against
  chemical liquids.
• Structural Layer
  E-glass fiber is used and it is supp -orting layer of GRP pipe with
  mechanical and physical stiffness.
• External Layer
  It protects GRP pipe from aging and
  deformation originated from environm -ental factor such as ultraviolet rays.