Epp Composites Pvt. Ltd.

Epp Composites Pvt. Ltd. » Products » GRP / GRE Pipe Products

GRP / GRE Pipe Products

GRP/GRE Pipe products are manufactured by reinforcing with glass fibres, hence also known as FRP composite. Glassfibre reinforced plastic (GRP) or glassfibre reinforced epoxy (GRE) is the best when it comes to functional and durability aspect. However, it is not so feasible for use in aesthetic and glamour way. Today, it is the most favorable material for any pipe manufacturer.

One of the largest and single applications of polymer composites in the country is in the pipes, buried and above the ground. Majority of GRP usage (approximately 70% of the total) accounts for sewage and portable water transportation pipes.

When it comes to glass reinforced epoxy (GRE) piping system, it is specially processed and designed for demanding conditions of offshore environment. It has all the strength and durability to sustain highly corrosive fluids in all conditions of temperatures, pressures and adverse soil and weather conditions. The major applications are in desalination, oil exploration, fire mains, chemical plants, dredging, portable water and many more like this.

In the late 1990s, there was a phase of market change, and to cope, the global GRP / GRE pipe industry also became stronger. Composite pipe have proven their competence in all the conditions including when the cost of the materials were increasing due to high crude oil and natural gas pricing. In comparison to the industry of iron and concrete materials, the market of composite pipes is developing and gaining popularity.


GRE Pipe

In offshore offshore production, platform and drilling rig, due to severe corrosion in most metal piping, there was increase in the cost manifold the original investment due to high maintenance part.

For complete solution to offshore environment related problems, glass reinforced epoxy (GRE) piping system is introduced that can sustain even in highly corrosive fluids. With the ability to work under various temperatures, pressures and adverse soil and weather conditions, these pipes are used especially in desalination, chemical plants, oil exploration, dredging, fire mains, portable water and many more.

Unlike GRP pipes which are self cured, GRE pipes are cured in an enclosed chamber at high temperature. Proved to be one of the best solutions in applications of petrochemical and marine industries, GRE pipes are treated for a maintenance free and light weight design with longer service life span.

We have the capability to manufacture 30 KM GRE pipe per month taking into account average diameter of 300 mm. We are the first Indian company to get API 15 LR certification for GRE pipes.

Petrochemical & Refineries
  • Crude oil transmission
  • Salt water disposal
  • Petrochemical and refineries
  • Oil field application
  • Sea water transmission
  • Potable water transmission
  • Cooling Water
  • Column piping
  • Fire water and fire protection
  • Drainage
  • Sewerage
  • Potable water

  • Cargo
  • Steam condensate return
  • General water service
  • Brine transmission
  • Crude oil slop line and wash line
  • Effluent
  • Jet fuel handling
  • Fuel Handling
  • Fuel depots
  • Service condition
  • Corrosive liquid transmission
  • Chemical processing
  • Desalination
  • Fire water and fire protection

  • Light weight :
    In comparison to other materials, GRE pipe have high strength-to-weight ratio. It is light in weight by 1/5th of steel, 1/10th of P.S.C and 1/8th of C.I. This enables for easy and quick installation of GRE pipes with handling modification and repairs.
  • Corrosion resistance :
    Made from composite material of epoxy resin and glass fiber, GRP is an inert material. Due to this reinforcement, it ensures excellent resistance to corrosion, chemical and weather. Along with this, the cost of additional coating and cathodic protection gets saved.
  • Longer service life :
    Even after continuous service of 50 years, the GRE pipes will still have safety factor of 1.8 times greater than its pressure class. This is due to its hydraulic design basis (HDB). In comparison to C.I., steel, G.I. and P.S.C. pipes that have lower life cycle, these GRE pipes have reliability, longer service life and durability.
  • High resistance to surge pressure :
    Unlike CI pipes, in GRE pipes, there is very less chance of bursting due to water hammer as it is highly resistant to surge pressure.
  • Low Thermal Conductivity :
    There is no requirement for external insulation in the GRE pipes for maintaining the internal temperature as they have excellent thermal insulating properties.
  • Hydraulic Efficiency :
    GRE pipes gives offer great saving in energy and pumping cost due to the translucency and smooth internal surface. All these factors results in high "C" value that allows the pipe to carry high flow at same frictional head loss.

Filament winding process is the method adopted for manufacturing GRE pipes. In this process, supports are used for transporting glass fibres to the resin tray, in which the glass is impregnated by resin. It is then followed by the application of impregnated glass on a rotating mandrel (mould) at a specified angle. This winding process is continues till the time required wall thickness is achieved. Post the process of pipe curing with oven, a mechanically procedure (i.e. hydraulic pipe extractor) is applied for extracting the curing from mandrel. After cutting the pipe to required length, its ends are machined to create a joint configuration.

  • Design standard AWWA 45 / ISO 14692
  • Pipe specification standards - ASTM D 2996 / API 15 LR / AWWA C 950 etc.
  • Pipe classification standard - ASTM D 2310
  • Pipe long term test standard - ASTM D 2992

  • PN - Pressure classes 10 to 70 bar as per API 15 LR

  • DN - Diameters from 25 mm to 600 mm
  • L - Length from 2 mtrs to 12 mtrs

Material of Construction
  • Epoxy resin and glass roving


GRP Pipes

We are a certified company with B.I.S certification for potable water GRP piping. With the market change that was witness in late 1990s, the global GRP / GRE pipe industry is getting stronger. The market of composite pipes remain competitive, inspite of rising material costs due to the high crude oil and natural gas pricing.

Today, 70% of all GRP usage accounts in sewage and portable water transportation pipes and this is continued to be its single largest growth driver. Whether it is buried or above the ground, GRP pipes is the single largest application of polymer composites in the country.

GRP pipes are widely used for a diverse range of applications, including:

  • Wastewater / Sewerage collection - domestic and industrial
  • Drainage
  • Water supply (cross country transmission and distribution) - municipal, industrial and agricultural
  • Irrigation
  • Penstocks - hydroelectric power generation
  • Storm water
  • Sea water intake/outfalls - circulating cooling water for power and petrochemical industries
  • Slip lining - sewer renewal and structural reinforcement for pressure pipes

  • Light weight and long service life
  • Precision coupling with elastomeric gaskets
  • Corrosion resistance
  • Resistance against cohesive material and erosive natural soil
  • Flexibility of modification at very low cost
  • Superior hydraulic characteristics
  • Easy installation using coupler joints

Advanced techniques like dual headed filament winding, hand layup and continuous filament winding process are used for manufacturing EPP pipes. Out of all the hi-tech procedures, advanced 2 axis and 4 axis CNC filament winding technology is implemented in GRP pipe. In this process, method for pipe fabrication involves roving of continuous glass strand which is helically wound around a rotating mandrel at an angle of 55° and pre-saturated in a resin bath.

Till the desired wall thickness is achieved, the winding process is continued in bi-directional layers. This winding angle of 55° will provide optimum 2:1, hoop to axial ratio. All the GRP pipes with filament winding is better than pipes manufactured with other methods like hand-layup, as they show better physical properties and have longer service life.

Our pipes, fittings and liners are ID based and cover a wide range of applications and sizes.

  • BIS - 12709 - Portable Water Applications
  • BIS - 14402 - Sewage Applications
  • Design standard AWWA C-950

  • PN - Pressure Classes 3, 6, 9, 12 & 15 Bar. Availability of higher pressure classes on request
  • SN - Stiffness Classes 62, 124, 248 & 496 kPa. Availability of higher stiffness classes on request

  • DN - Diameters from 25 mm to 4000 mm
  • L - Length from 2 mtrs to 12 mtrs

Material of Construction
  • Polyester resin, fibreglass and silica sand


FRP Process Pipes

  • Light weight and long service life up to 50 years Excellent resistance against corrosive material and erosive natural soil Several Precision Joining Mechanisms Available
  • Butt & Wrap Lamination Type Flange End Type
  • Selection of compatible Resin based on fluid application Capability to sustain high pressure and buckling for UG application High amount of UV Stabilization and Low Thermal Application for AG application & Flexibility of modification within a short duration Superior hydraulic characteristics Fast execution & Completion of projects in time

  • Acid Transfer
  • Process Piping
  • Plant Internal Piping

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