GAS
AND CHEMICAL CARRIERS
Cargo
Hose Testing
Resolutions
MSC.102(73) and MSC.103(73) require cargo hoses, including their
end-fittings, installed on board chemical and gas carriers
on/after 1 July 2002 to be prototype tested at normal ambient temperatures.
After
testing with at least 200 pressure cycles from zero to twice the
working pressure, the results should demonstrate the capability
to withstand a bursting pressure of at least 5 times the maximum
working pressure at the extreme service environment.
Resolutions
MSC.106(73) and MSC.107(73) contain similar amendments for existing
ships to the Chemical and Gas Codes. WP/19
Emergency
Shutdown Valves
The
newly adopted regulations to the IGC Code, contained in resolution
MSC.103(73), clarify that, for gas carriers built on/after 1 July
2002, the measurement of the 30 second time limit from manual or
automatic initiation to final closure of emergency shutdown valve
is to include the signal response time in addition to valve closure
time. However, closure actuators and mechanisms are to avoid surge
pressure in the pipeline while smoothly cutting off product flow. WP.19
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