... cost. (2) reduce diameter size. (3) to shorten the time of the pump.(4) FRP pipe culvert scaling, not long, make ... resistance, anti-corrosion, reduced costced cost prolong the life, At the same time as the water conveyance that does not rust, not ... conveying sewage and sludge, the sea, and other media.4, compression: the technique requirements, design and manufacture of the pressure piping and fittings, ...