EGR operated engines process water equipment operational safety procedure

  • 1 Nikola Vaptsarov Naval Academy - Varna


In this publication the wash water subsystem features of an exhaust gas recirculation (EGR) system of marine diesel engine are considered. In regard with the safety of the operation, a procedure for handling the wash water system of the EGR is proposed. The chemical reactions between the flue gas and the process water are observed. The wash water system components and their specifics related to the chemical reactivity are presented. The problems with the water impurities, pH value and the operation of the EGR system are highlighted. The engineering crew special precautions on safety on using caustic soda on board is considered. Recommendations are proposed.



  1. Jingjing Liu, Sheng Fang, Qiming Bing, Fu-Ming Tao, Jing-yao Liu, Theoretical study of the auto-catalyzed hydrolysis reaction of sulfur dioxide, Computational and Theoretical Chemistry, Volume 1076, (2016), Pages 11-16
  2. Calvin R. Nicho lson, “pH Measurement and Installation Guidelines for SO2 Scrubbers”, Electric Utility and Co-Generation Congress, Houston, TX (1992)
  3. Graeme Puxty, Steven Chiao-Chien Wei, Paul Feron, Erik Meuleman, Yaser Beyad, Robert Burns, Marcel Maeder, A Novel Process Concept for the Capture of CO2 and SO2 Using a Single Solvent and Column, Energy Procedia, Volume 63, (2014), Pages 703-714
  4. OxyChem, Caustic Soda Handbook, Occidental Chemical Corporation (OxyChem) Basic Chemicals Group Occidental Tower 5005 LBJ Freeway Dallas, TX, (2009)
  5. Sodium Hydroxide Solution and Potassium Hydroxide Solution (Caustic) Storage Equipment and Piping Systems, Edition 4, The Chlorine Institute, (2012)
  6. Sodium hydroxide solutions (more than 10% NaOH) Material safety data sheet, (2001)
  7. Iwaki Amerika, Solving Caustic Soda Crystallization Issues on Mechanical Seals, online publication, (2020)
  8. Davies. Michael, Alloy selection for service in caustic soda, A guide to the use of nickel-containing alloys, Second Edition (2019)
  9. Thyssenkrupp Materials (UK) Ltd, Stainless Steel 1.4301 – 304, Material Data Sheet
  10. Aalco Metals Limited, Stainless Steel LDX 2101, Material data sheet, (2019)

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