Standard pipe fittings are problematic in sanitary systems, as tiny voids between the mating
threads of male and female pipe fittings may provide refuge for micro-organisms. To avoid this
problem, special sanitary fittings are used instead. These fittings consist of a matched pair of
flanges, held together by an external clamp. An array of sanitary fittings on an instrument test
bench appear in the following photograph:
The installation of a pressure transmitter on an ultra-pure water line using one of these sanitary fittings. The external clamp holding the two flanges together is clearly visible in this photograph:
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