What are regulations for testing of CO2 bottles as per SOLAS ?

• First pressure test within 20 years of initial pressure test at manufacture, provided annual tests have been carried out with satisfactory results.
• Subsequent pressure tests every 5 years

Note:

Testing for High-Pressure Halogenated Hydrocarbon (Halon) systems

• The Administration strongly advises owners to consider replacing their existing Halon systems before the hydrostatic test of the cylinders is due. However, where problems arise the following may be considered for which special application must be made on a ship-by-ship basis:

Due to the environmental implications of emptying, testing and recharging of these cylinders and the reduced risk of internal corrosion due to the absorption of moisture by the Nitrogen pressurization gas.

You may also know about SCBA bottles:

Inspection