It is generally recognized that water make-up to marine boilers operating at pressures in the range 850 to 1200 psi should contain dissolved solids of less than 1-ppm combined with very low levels of dissolved oxygen, carbon dioxide, silica and heavy metals. This quality can be obtained from seawater on an economic basis only by using evaporation followed by mixed bed demineralization and efficient deoxygenation. The latter can be achieved using a combination of mechanical deaeration followed by chemical scavenging of any remaining traces. The preferred conditioning of water in the boiler drum circuit is by ordinated phosphate treatment to enable the desirable degree of alkalinity to be maintained without risk of caustic embrittlement. The recommended system gives the maximum protection against the occurrence of corrosion in the boiler, turbine and condensate systems and is inexpensive in both capital and running costs. In this paper a description of the ion exchange purification system to achieve the required water quality is given.

  • Availability:
  • Corporate Authors:

    Benn Brothers Marine Publications Limited

    Lyon Tower, 125 High Street, Colliers Wood
    London SW19 2JN,   England 
  • Authors:
    • Down, P E
  • Publication Date: 1971-4

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Filing Info

  • Accession Number: 00034417
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Sep 27 1974 12:00AM