In an attempt to prevent more accidents, meetings and investigations have highlighted the following points as necessities in sterngear: (i) Reliability; (ii) Efficient/punctual steering; (iii) Immediate response; (iv) Easy operation; (v) Robust construction with few moving parts; (vi) Simple and compact; (vii) Wide rudder angles. IMCO intends to revise existing steering gear rules: recent committee meetings have arrived at a concept known as "single failure criteria", which requires that single failure in almost any part of the system should not prevent recovery of steering capability within 45 seconds. Proposals for tankers of over 10,000 gross tons, if they were to become law, would make all types of steering gear less safe because of the extra components placed in the circuit. Two systems are briefly described: (1) A more complex unit similar to those being designed by other steering gear manufacturers, forms a duplicated actuator. Frydenbo points out that it will cost more, for producer and consumer and that, if there are a number of valves lying dormant during normal operation and only expected to work in an emergency, there is no guarantee that these components will work when most needed. In contrast to this, design (2) has a reliable fail safe system. The key to this is in the automatic lock valve which can open for outlet only under a positive inlet pressure from its respective fluid pump. This means that if a leak should occur in the feed lines on one side, the automatic lock valve will close, preventing loss of fluid from the opposite tank. The tank on the leaking side will operate an alarm if the fluid gets below a certain level, but the steering system remains operational. Diagrams of the two systems are provided. A close watch will be kept on this contentious subject--the result of the IMCO meeting on May 19, 1980 could change the picture considerably.

  • Availability:
  • Corporate Authors:

    IPC Industrial Press Limited

    Dorset House, Stamford Street
    London SE1 9LU,   England 

    IPC Industrial Press Limited

    Quadrant House, The Quadrant
    Sutton, Surrey,   England 
  • Publication Date: 1980-4

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00312226
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 26 1980 12:00AM