Marine Engineering

Purpose of boiler water treatment Prevent corrosion of boiler tubes and shell Prevent scale formation and hence maintain heat transfer rates. Control sludge formation within the boiler. Control foaming and priming. Prevent entry of foreign matter, oil etc. into the boiler via feed system Extend boiler survey to the maximum allowed. FOLLOWING TESTS ARE CARRIED OUT:- Boiler water tests are therefore done to ensure that the chemical levels are maintained as required. Chlorides : This is a measure of presence of Chlorides, usually an indication of contamination of Boiler water with sea water.( Sodium Chloride / Calcium or Magnesium Chloride ) . This results in increased scale formation, acidity and boiler priming.  Normal levels: Chlorides < 300 ppm.   What to do if chloride content increases beyond normal value.? Check for leakages of SW into the system, mainly from atmospheric condenser leak and rectify any leaks found. Blowdown at regular...