Dear Bentley As i understand that vapor pressure of water varies based on temperature and site attitude. Currently i am designing water transmission pipeline in saudi arabia temperature around 45 celicus degree and network elevation is 700 m based on sea level. So kindly if some one can provide a method or table to estimate the vapor pressure based on altitude and temperature this will be great help. Second question is that i am using uPVC pipes and the client is asking to get rid of any negative pressure in uPVC pipes because upvc and O-Ring can nor withstand with any negative ppressure. My question is what is Minimum allowable downsurge pressure for upvc pipes. Eng.Sayed Elhagar
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