Figure 89. Sea cushion with tire chain net (photo 

 courtesy of Seaward International) . 



epoxy or polyester may be used in combination with fiberglass to manufacture 

 a tough corrosion-resistant pipe. This pipe is utilized in and around the 

 waterfront to avoid the necessity of corrosion procedures such as coating, 

 coating and wrapping, or cathodic protection. 



The material costs of FRP pipe are higher than steel pipe. However, 

 installation costs for FRP pipe can be significantly lower than that of 

 steel pipe due to its lightweight, ease of handling, and capability of 

 making field joints. In fact, the total installed cost of FRP piping is 

 usually lower than that for steel pipe in the same size range. 



(2) Nonreinforced Pipe . Nonreinforced plastic pipe in the 

 smaller size range, to about 25-centimeter (10 inch) diameter, is used in 

 many construction projects. It does not have the structural strength of FRP 

 in large diameters but is sufficiently strong in most small diameter applica- 

 tions. Nonreinforced plastic pipe is produced by the extrusion process. 

 The present technology for pipe extrusion uses PVC powder compounds produced 

 by cold blending techniques that do not require high-cost intensive mixing 

 equipment. Nonreinforced plastic pipe has a large use in the electrical 

 industry as electrical conduit and, because of its lower cost and excellent 

 corrosion resistance, is finding expanded use as a water and drainage pipe. 



305 



