What media can FRP pipe carry?
FRP pipe is suitable for conveying water, wastewater, acid and alkali solutions and many chemical media, and is a common choice for corrosion-resistant water lines and chemical piping.
The smooth inner wall resists scaling, so flow resistance is low, transfer efficiency stays high over long service and energy consumption is reduced.
The specific media and concentrations that apply depend on the resin system, so the medium composition should be stated to the manufacturer at the selection stage.
FRP pipe is also used in special applications such as seawater transfer and geothermal systems, so its range of use is broad.
How much pressure can FRP pipe withstand?
The pressure rating of FRP pipe is set by the structural layer thickness, winding angle and resin content together, and products are available for different pressure classes.
Pipes are normally pressure tested before delivery, and the corresponding pressure class and test parameters are provided.
Selection should combine working pressure, medium temperature and safety factor to determine wall thickness and the structure of the reinforcing layer.
After installation, pressure piping should be hydrostatically tested as specified to confirm that the joints seal reliably.
How is FRP pipe connected?
FRP pipe can be joined by socket, flanged, threaded or bonded connections, the choice depending on diameter and service requirements.
Socket joints install quickly and seal reliably and are often used in buried piping systems; flanged joints are easy to dismantle for maintenance and suit equipment connections and valves.
Joints should be made following the procedure supplied by the manufacturer to ensure sealing and joint strength.
Large-diameter pipe commonly uses a combination of socket and adhesive bonding, while small-diameter pipe can be threaded or bonded.
What temperature can FRP pipe handle?
The temperature range of FRP pipe depends on the resin system; products made with ordinary unsaturated polyester resin are generally used continuously at around 60 °C.
Heat-resistant resin systems withstand higher temperatures, at a correspondingly higher material cost.
For high-temperature duty, state the medium temperature and duration so that accelerated resin ageing does not shorten service life.
Where heat and corrosion resistance are both required, higher-performance systems such as vinyl ester resin can be considered.
What are the advantages of FRP pipe over steel pipe?
FRP pipe has a density of about one quarter that of steel, so it is light and transport and installation costs are low.
Its corrosion resistance is far better than ordinary steel pipe: it does not rust in acidic or alkaline environments and maintenance costs are low.
The smooth bore resists scaling, so transfer efficiency stays high over long service and scale blockages are unlikely.
The drawback is relatively low stiffness, so buried or above-ground runs need properly designed supports and restraints.
What should be noted when transporting and storing FRP pipe?
Avoid heavy impacts and scratches from sharp objects during transport, and use soft slings for loading and unloading.
Store pipe flat on level ground; when stacking in several layers, use timber dunnage to prevent long-term deformation.
Do not leave pipe in prolonged direct sunlight, particularly pipe without weather-resistant treatment, to avoid surface ageing.
The storage area should be dry and ventilated, and pipe should not come into direct contact with corrosive chemicals.
