[PSUBS-MAILIST] G.L. summary Hydraulic & Oxygen Systems

[Alan James]

Hydraulic Systems
   The Hydraulic system is to be built to GL rules, Machinery Installations (1-1-2), section 14. standard.
   All pipes which are passing through the pressure hull have to be at least to "pipe class 1 " standard.
   Hydraulic fluid is selected so that if water mixes with it, it doesn't seriously impair the system.
   Hydraulic systems require a closed circuit safety valve to prevent over-pressurization.
   They require filters & provision made for venting & de-watering the system.
   Hydraulic fluid tanks are to be fitted with level indicators.
   Hydraulic lines shouldn't be routed close to oxygen systems
   All the necessary indicating devices are to be fitted.
Oxygen Systems
   Any level of O2 of more than 25% is treated as an O2 line.
   Everything needs to be cleaned & degreased prior to assembly.
   In piping systems containing O2, only spindle valves are allowed. Ball valves are allowed as emergency
shut off valves if they are marked as such & secured against unintentional use.
   Where possible the O2 pressure is to be reduced at the bottle.
    High pressure O2 lines shouldn't be routed through accommodation spaces or engine rooms etc.
   For O2 lines with operating pressures above 40 bar (580psi), high alloyed Cr-Ni-steels with a content of
Cr & Ni of together at least 22%, or Cr-Si-steels with a Cr content of at least 22% are to be used.
   Spindle valves for pipes wider than 15mm & operating at more than 40 bar, have to have their spindle gear 
outside the gas space.
Alan
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