Type CNG-1 stålflasker, som er konstrueret i overensstemmelse med ISO 9809 og opfylder alle krav deri, behøver kun opfylde forskrifterne i punkt 6.3.2.4 og 6.9 til 6.13.
The design of cylinders shall cover all relevant aspects which are necessary to ensure that every cylinder produced according to the design is fit for its purpose for the specified service life; Type CNG-1 steel cylinders designed in accordance with ISO 9809 and meeting all the requirements therein are only required to meet the requirements of paragraphs 6.3.2.4. and 6.9 to 6.13.