The continually increasing use of hydrualics for steering gears, winches, capstans, hatchcovers, remote control systems and so on, imposes more and more exacting requirements on hydraulic oils. Operating temperatures can change widely in a single voyage and equipment may have to be used in both tropical and arctic conditions. The hydraulic oil must therefore have, as a hydraulic medium, good low temperature flow characteristics with sufficient viscosity at high temperature to maintain pump efficiency, and as a lubricant the oil must provide wear protection for moving parts. The paper outlines evaluation methods used in the development of hydraulic fluids for marine use. Factors covered include: low temperature pumpability--rig testing versus laboratory testing like pourpoint and extrapolation from viscosities at 100 and 200 degrees F, high temperature pumping efficiency--rig test for measuring losses resulting from decreased viscosity, measuring sheer stability of high V.I. oils--laboratory and rig tests, influence of air on the performance of the hydraulic system, influence of pressure on compressibility, specific gravity and viscosity, oxidation stability of hydraulic fluids measured in standard laboratory tests, new laboratory and rig tests, systems cleanliness, seal compatibility, methods and evaluation, protection against rust--influence of sea water, demulsibility, corrosion protection, protection against wear--rig tests and result evaluation, and filterability--ease of filtration.

  • Supplemental Notes:
    • 45 Conference Papers presented at IMAS 73, London, 4-8 June 1973, organized by the Institute of Marine Engineers. This paper is available only in a set of 3 papers in Subject Group 3: "Fuel Lubrication and Fire" at $7.50.
  • Corporate Authors:

    Institute of Marine Engineers

    Memorial Building, 76 Mark Lane
    London EC3R 7JN,   England 
  • Authors:
    • Fluyt, D
    • Keyworth, R O
    • Ponjee, A L
    • Schmitt, R H
  • Publication Date: 1973

Subject/Index Terms

Filing Info

  • Accession Number: 00048461
  • Record Type: Publication
  • Source Agency: Institute of Marine Engineers
  • Files: TRIS
  • Created Date: Nov 14 1973 12:00AM