Development of the Portable Water Separometer for the WSIM Test

The water separation index, modified (WSTM) test, ASTM D2550, is used to indicate the presence of harmful levels of surface active agents (surfactants) in jet fuel. Many fuel suppliers, handlers and users have replaced the complex laboratory test, ASTM D2550, with a quick, simple test, ASTM D3948, that uses a compact, portable field test instrument, the Micro-Separometer. Results of co-operative ASTM test programs to develop the Micro-Separometer test are presented. The report shows that the Micro-Separometer produces the same water separation index as ASTM D2550 and that the test precision is equivalent or better.