Given the use of compressed natural gas (CNG) as an alternative fuel in vehicles, which is more cost-effective compared to gasoline, there are many dual-fuel vehicles in our country. If safety measures are not observed, they can pose significant risks. To prevent these hazards, dual-fuel vehicles and their tanks must be inspected in accordance with national vehicle and tank standards. With legal authorizations and certification from the National Accreditation Center of Iran, we conduct technical inspections of dual-fuel vehicles according to standards 9426-9747, as well as technical inspections of vehicle tanks and supervision of the hydrostatic testing process in accordance with standards 9426-6792. In addition to the inspection of vehicle technical inspection centers according to standard 15678-2 and the inspection of automobile after-sales service centers according to standard 19117. We also cover 1. The Vehicle Type Approval according to standard 6924. 2. Motorcycle Type Approval according to standard 7558. 3. Automotive Parts Type Approval according to standard 7598.