171 PIPE & FITTINGS 1. Excellent chemical resistance Since the inner anticorrosion layer is made of rigid PVC, AV Pipes excel in corrosion resistance and are ideally suited for plants that handle acids, alkalis, and halogens. 2. Great mechanical strength Since the external surfaces are reinforced with FRP, AV Pipes have great pressure resistance and excellent impact resistance. 3. Good heat resistance Since the external surfaces are reinforced with FRP, AV Pipes are capable of long service at high temperature. 4. Low coefficient of expansion Since the PVC and FRP are integrated by special technology,the adhesive strength between the PVC and FRP is high, making the coeffi cient of linear expansion 1/2 that of PVC. 5. No worry about external or electrolytic corrosion Since the external layer employs FRP, AV Pipe can be used without anxiety even under corrosive environments. Besides, it is a perfact insulator, eliminating any worry about electrolytic corrosion. 6. Lightweight Made of plastic, AV Pipe is far lighter than metal pipes, which makes piping work at high elevations easier. 7. Ease of installation TS joining of PVC can be used for on−site installation. FRP lamination can be formed easily at the junctions. (1) Rigid PVC pipe The residual stress in the pipe has been removed by a special method unique to AV Pipes. (2) Surhface-treated portion The surfaces of the pipe have been treated specially to enhance the adhesive effect of the primer. (3) Special primer A special primer is used to bond the rigid PVC pipe and FRP layer. (4) FRP layer A reinforced layer consisting of a lamination of glass fiber impregnated with polyester resin. (5) Finished surface layer A layer finished with anticorrosion polyester resin. AV Pipe（SU type） AV Pipe（GU type） �@ �A �B �C �D �@ �A �B �C �D Features Structure