Return loss is the negative of the magnitude of the reflection coefficient in dB. Since power is proportional to the square of the voltage, return loss is given by, where the vertical bars indicate magnitude.eturn loss is the negative of the magnitude of the reflection coefficient in dB. Since power is proportional to the square of the voltage, return loss is given by, where the vertical bars indicate magnitude.
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Plastic or PVC pipes. There are 3 common types of plastic pipes are available in market, as given below. 1  Unplasticized PVC (UPVC) or rigid pipes for use with cold water. 2  Plasticized PVC pipes which are plasticized with addition of rubber. 3  Chlorinated PVC (CPVC) pipes which can withstand higher temperatures upto 120 0 (used to carry hot water).