GRP and GRE Solutions

NHAN VIET ICS JSC offers GRP-and-GRE-Solution in Viet Nam market.

GRE pipes are alternative to carbon steel pipes especially for corrosive, aggressive and normal duties, higher strength than the common of GRP pipes

Glass Reinforced Plastic (GRP)

GRP piping is suitable for:

GRP is an extremely useful material within a number of different and varied industries. Ranging from hotels to construction, marine docks to education, GRP is very versatile and can be easily fitted to any location within any industry.

GRP products are growing in their use and popularity, and that is down to the long list of advantages that GRP offers to any application. The innate qualities of GRP make it a highly desired material for use.

Some GRP advantages:

High Strength-to-Weight Ratio

Low Maintenance

Affordable

Versatile

Corrosion Resistant

UV Stability

Durability

Weathers Well

Anti-Slip Finish

Glass Reinforced Epoxy (GRE)

GRE piping is suitable for:

Plant process piping

Oil & Gas flow lines, up to 4000 psi pressure

Potable water distribution schemes

Power plant piping

Offshore platform applications

Downhole tubing and casing

Some GRE advantages:

It is cheaper over the project life because it does not corrode

There is improved flow capacity due to lower pipe friction characteristics

It require little or no maintenance unlike carbon steel

It is suitable for use in swamp (sweet and salt) water environment which is corrosive and aggressive

It weighs far less than carbon steel, which is a major advantage for offshore applications

It is cheaper and faster to install than carbon steel.

GRP and GRE Technology

GRP Technology

The design philosophy of GRP pipes is to provide products with suitable properties and the required margin of safety that will enable the pipe to work satisfactory after an extended period of operation (50 years) under typical service conditions.

Using the continuous advancing mandrel process, which represents the state of the art in GRP pipe production, a very compressed laminate is created that maximizes the contribution from the three basic raw materials, namely glass-fiber, resin and sand.

The Continuous advancing mandrel equipment has the capability of applying a special inner resin liner for severely corrosive applications, while utilizing a standard type resin for the structural and outer portion of the laminate.

During the process, other materials such as a glass veil or a polyester veil can be used to enhance the abrasion, the chemical resistance and the finishing of the pipe.

Liner
It is in direct contact with the conveyed fluid and guarantees the maximum resistance to the chemical attack from the fluid itself. Moreover, the liner presents an internal surface particularly smooth, without defects, cracks or delaminated zones. The liner is composed of one resin impregnated glass veil and one glass mat tape and is produced in two steps (inner liner and outer liner)

Mechanical resistant layer
Its function is to render the pipe wall resistant to the stresses due to the design conditions (stresses due to the internal and/or external pressure, flexural strength due to the external loads etc.) and generated by transport and laying operations. The thickness of the filament depends then upon the design conditions. The mechanical layer is composed of resin impregnated continuous glass filament roving.

Gel coat or external layer
It has a thickness of about 0,2 mm and consists of pure resin without glass reinforcement. It guarantees the complete impregnation of the peripheral fibers, thus yielding the external pipe surface completely free of protruding fibers and well finished. The ultraviolet ray inhibitor is always added to the external coating, to prevent the nearly negligible weathering effects.

Diameter and classes
GRP pipes using Continuous Advancing Mandrel are manufactured in diameters ranging from 100 mm to 4000 mm. Any nominal diameter can be manufactured.
Nominal pressure classes are 4, 6, 10, 16, 20, 25, 32 bar
Intermediate or higher pressure classes are considered on request or depending on the design conditions
Pipes are also classified according to specific pipe stiffness. Specific pipe stiffness classes are 1250, 2500, 5000 and 10000 Pa.
Intermediate or higher specific pipe stiffness classes are available on request or depending on the design conditions.

Composition

The most common types of glass fiber used in fiberglass is E-glass, which is alumino-borosilicate glass with less than 1% w/w alkali oxides, mainly used for glass-reinforced plastics. Other types of glass used are A-glass (Alkali-lime glass with little or no boron oxide), E-CR-glass(Electrical/Chemical Resistance; alumino-lime silicate with less than 1% w/w alkali oxides, with high acid resistance), C-glass (alkali-lime glass with high boron oxide content, used for glass staple fibers and insulation), D-glass (borosilicate glass, named for its low Dielectric constant), R-glass (alumino silicate glass without MgO and CaO with high mechanical requirements as Reinforcement), and S-glass (alumino silicate glass without CaO but with high MgO content with high tensile strength).

Naming and use.

Pure silica (silicon dioxide), when cooled as fused quartz into a glass with no true melting point, can be used as a glass fiber for fiberglass, but has the drawback that it must be worked at very high temperatures. In order to lower the necessary work temperature, other materials are introduced as "fluxing agents" (i.e., components to lower the melting point). Ordinary A-glass ("A" for "alkali-lime") or soda lime glass, crushed and ready to be remelted, as so-called cullet glass, was the first type of glass used for fiberglass. E-glass ("E" because of initial Electrical application), is alkali free, and was the first glass formulation used for continuous filament formation. It now makes up most of the fiberglass production in the world, and also is the single largest consumer of boron minerals globally. It is susceptible to chloride ion attack and is a poor choice for marine applications. S-glass ("S" for "stiff") is used when tensile strength (high modulus) is important, and is thus an important building and aircraft epoxy composite (it is called R-glass, "R" for "reinforcement" in Europe). C-glass ("C" for "chemical resistance") and T-glass ("T" is for "thermal insulator" -- a North American variant of C-glass) are resistant to chemical attack; both are often found in insulation-grades of blown fiberglass.

GRE Technology

Glass Reinforced Epoxy or GRE pipes are a valid alternative to carbon steel pipes especially for corrosive, aggressive and normal environments.

GRE pipe technology is based on the Discontinuous Filament Winding process using high strength fiberglass (E-glass) and amine cured epoxy resin as basic material. Numerically controlled machines manufacture the product on a mandrel according to the cross section filament winding process. The continuous glass fibers are helically wound at predetermined angles and bonded with the epoxy resin.

Lightweight and easy to handle and install GRE pipes have a smooth internal surface that reduces friction and enables a high pipe flow capacity. Low thermal conductivity of GRE pipes in comparison to steel (only one percent of steel values), minimizes the cost of insulation and the heat loss. Another major benefit of GRE pipes is that once installed they are virtually maintenance-free.

GRE pipes are well suited for environments where the corrosion resistance at competitive prices is required.
GRE pipes offer a unique combination of high mechanical, thermal and chemical resistance which is obtained by the selection of high performance components and a proper design of the structure. The inner liner, which is made by a resin rich layer reinforced with C-glass or synthetic veil, guarantees the pipe water tightness, its chemical and temperature resistance. The mechanical resistant layer is composed of successive layers of pre-stressed glass roving impregnated with epoxy resin and orientated with a precise, predetermined angle selected in order to achieve the properties required. The resin and the hardener system are selected with the consideration of the combination of properties required from the finished product. The glass reinforcement in the form of continuous roving is chosen bases on its compatibility with epoxy resin. It is applied on the rotating mandrel following the hoop (radial) winding pattern combined with a helical winding pattern at an angle ranging from 45° to 90°.

Glass tape or unidirectional reinforcements can be used to obtain local reinforcement. An external resin coating reinforced with a synthetic veil adds a finish to the pipe. Should weathering be a problem a UV inhibitor will be added to the coating.

GRE pipes are generally manufactured with an integral joint, which means that the socket (for bonding, lock, or thread) is produced simultaneously with the pipe body by winding on a specially designed metallic mould fixed at one end of the mandrel. The pipes are wound on precisely machined steel mandrels, the mandrel is extracted only when the pipe is cured.

ADVANTAGES

Wide range of diameters from 1 " (25mm) up to and including 48 " (1200 mm).
Standard lengths of 19.5 ft (6m) and 39.3 ft (12m).
Adhesive, locked bell/spigot, lamination and flanged jointing systems.
Corrosion free in most environments
Long life (50 years) + zero maintenance = low life cycle cost.
UV Resistant - can be safely installed above-ground.
Conductive pipe and fittings are available.
Fast, low cost assembly due to light weight and simple jointing techniques.
Lighter support needed for above-ground systems.

An individual structural glass fiber is both stiff and strong in tension and compression—that is, along its axis. Although it might be assumed that the fiber is weak in compression, it is actually only the long aspect ratio of the fiber which makes it seem so; i.e., because a typical fiber is long and narrow, it buckles easily. On the other hand, the glass fiber is weak in shear—that is, across its axis. Therefore, if a collection of fibers can be arranged permanently in a preferred direction within a material, and if they can be prevented from buckling in compression, the material will be preferentially strong in that direction.

Furthermore, by laying multiple layers of fiber on top of one another, with each layer oriented in various preferred directions, the material's overall stiffness and strength can be efficiently controlled. In fiberglass, it is the plastic matrix which permanently constrains the structural glass fibers to directions chosen by the designer. With chopped strand mat, this directionality is essentially an entire two dimensional plane; with woven fabrics or unidirectional layers, directionality of stiffness and strength can be more precisely controlled within the plane.

A fiberglass component is typically of a thin "shell" construction, sometimes filled on the inside with structural foam, as in the case of surfboards. The component may be of nearly arbitrary shape, limited only by the complexity and tolerances of the mold used for manufacturing the shell.

MORE INFORMATION

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