VOLATILE ORGANIC COMPOUND (VOC) ANALYZER FOR DETECTING COOLING TOWER / HEAT EXCHANGER LEAKS

摘要

This is an in plant case study of a Model 204 volatile organic compound (VOC) in water analyzer. The system uses membrane sample transfer to separate VOC from cooling tower water. The water flows past one side of a membrane. The VOC permeates through the membrane into a clean dry carrier gas flowing past the other side of the membrane (1). This clean sample is ideal for readout using a solid state sensor, gas chromatograph, mass spectrometer, infra red or other readout. In plant on line chart recordings are shown that illustrate development of heat exchanger leaks and the response time to correct leaks at the one part per billion by weight (ppbw) level in an ethylene plant.