Danish Maritime Authority has noticed ClassNK of the Administration Requirements for pressure test of cylinders of high pressure CO2 fire-extinguishing systems on board Denmark flagged vessels as per attached (DMA Class Circular no.: 06/2009). In this regard, your necessary action would be appreciated.


For cylinders of high pressure CO2 fire-extinguishing systems are to be pressure tested in accordance with the following principles:
-1. CO2 cylinders are to be pressure tested every ten years.
-2. If, at an external inspection in connection with the annual surveys, the CO2 cylinders are in a satisfactory condition, the first pressure test interval may be extended to 20 years. However, this relaxation is not applicable to the following cylinders:
(1) Cylinders that have been discharged during their service history.
(2) Cylinders that have lost their pressure or weight.
(3) Cylinders that have corroded or been externally damaged.


For any questions about the above, please contact:

NIPPON KAIJI KYOKAI (ClassNK)
Survey Department, Administration Center, Head Office
Address: 4-7 Kioi-cho, Chiyoda-ku, Tokyo 102-8567, Japan
Tel.: +81-3-5226-2027 / 2028
Fax: +81-3-5226-2029
E-mail: svd@classnk.or.jp


Attachment:
1. DMA Class Circular no.: 06/2009