157.Fixed CO2 Routines

Monthly
 Alarms, Machinery trips, Door alarm, Quick closing valves, Flaps, Skylights, Ventilation fan trips to be tested.

Yearly
 General inspection of the installation, pipe lines to be checked.

2 Yearly
 1+
 Verify CO2 contents by mechanical advantage lever, ultrasonic liquid level measurement or radioactive liquid level measurement. Equipment for measuring CO2 content must be available on board ships. A maximum reduction of 5% in CO2 content may be allowed provided total CO2 quantity on board is not less than the required amount.
 Blow through the system with 6-7 bar air with plastic air bags at the nozzle ends.

5 Yearly
 1+2+
 The servo cylinders and any remote controlled stop valves to be tested by opening one pilot cylinder. The main CO2 bottles must be uncoupled for this purpose.
 Spring loaded relief valves to be checked and pressure tested at 180 bar.
 Checking of HP alarms which operate with gas pressure.
 Section of CO2 which can be shut off must be tested with air at 25 bar.

10 Yearly
 1+2+5+
 CO2 bottles to be inspected internally. Siphon tube or dip tube to be checked. Cylinders to be pressure tested at 250 bar. If permanent change in volume is observed, those cylinders to be discarded. After 20 years of installation of CO2 flooding system, these tests to be carried out every 5 years thereafter.

15 yearly and 5 year thereafter
 1+5+
 Pressure test HP pipes, stop valves to engine room, pump room, purifier room,etc. at 190 bar (hydraulic), medium pressure pipes at 80 bar (hydraulic) and low pressure pipes at 7 bar air.
 After hydraulic pressure testing, lines to be blown through by dry air.