TS 12664-2

TS 12664-2 is a withdrawn standard that sets out general rules for places converting road vehicle fuel systems to operate on compressed natural gas (CNG). Its focus is the organisational, physical, technical and personnel framework needed for such conversion workshops to operate in a controlled and reliable way.

Technical context for CNG conversion workshops

In general technical terms, CNG vehicle conversion involves adapting fuel-related components such as storage, lines, valves, regulators and connections so the vehicle can safely use compressed natural gas. Because CNG systems operate at high pressure, the workshop environment matters: appropriate equipment, disciplined work processes and competent staff are essential. This standard addresses the general conditions of the premises themselves, rather than the detailed design of the vehicle system components.

Organisation, personnel and documentation

By including rules on managership and certification, the document points to traceability and controlled operation as part of the workshop model, not just the physical layout. The referenced standards and regulations link the subject to vehicle modification rules, workplace licensing, electrical safety, water-related provisions and CNG component specifications. In practice, the standard brings together the basic institutional and technical expectations for workshops that perform CNG-related conversions.

• Applies to places that convert road vehicle fuel systems for CNG use.
• Covers managership, physical characteristics, technical equipment, personnel specifications and certification.
• Reflects the operational needs of high-pressure CNG systems, where suitable equipment and trained staff are important.
• The document is withdrawn, so it serves as a historical technical reference.