Final answer:
ISO 11439:2013 and ISO 11119-3:2002 are two standards that address CNG cylinder design in manufacturing, ensuring safety and performance.
Step-by-step explanation:
In the manufacturing of CNG (compressed natural gas) cylinders, several standards address the design and manufacturing process.
One important standard is ISO 11439:2013 which specifies the requirements for high-pressure CNG cylinders. It provides guidelines for the design, material selection, and testing of these cylinders to ensure their safety and performance.
Another relevant standard is ISO 11119-3:2002 which focuses specifically on the design and testing of CNG cylinders made of steel. This standard provides requirements for the mechanical strength, impact resistance, and fatigue resistance of the cylinders.