What is the difference between washout, siphon jet and blowout urinals?
In a washout urinal, water runs down the rim holes which washes the side walls, floods the sump (bowl area) and a water exchange is made exiting through a bottom outlet. This method is like a dilution process. A siphon jet urinal has a jet hole on the inlet of the trapway. When flushed, water is fed into the jet creating a stream that assists in pulling the water out of the urinal. With this method, the entire amount of liquid is displaced when flushed and siphon jet action will flush away the waste. A blowout urinal has a hole on the inlet of the trapway. This is the most aggressive flush, and as a result, is the noisiest of the three options. With this method, the entire amount of liquid is displaced when flushed. The high velocity jet action with larger trapway assures better drainline carryout and is recommended for stadium and other high-usage commercial applications.
