What strength should the bolts and nuts used to secure the cylinders withstand?

Answer: C — Eight times the weight of a fully pressurized cylinder

The correct answer emphasizes that the bolts and nuts used to secure the cylinders must be capable of withstanding a tensile strength that is eight times the weight of a fully pressurized cylinder. This requirement is in place to ensure that, in the event of an accident or sudden impact, the securement system can effectively maintain the integrity and safety of the CNG cylinders, preventing them from dislodging or causing a hazardous situation. CNG cylinders are under high pressure, and any failure at the connection points could lead to catastrophic failures, including cylinder rupture or loss of contents. By specifying that the securing hardware must bear a load significantly greater than the actual weight of the cylinder when fully pressurized, it ensures a margin of safety that accounts for dynamic loads and impacts beyond typical operating conditions. This guideline reflects the engineering standards in place for CNG systems, prioritizing safety and reliability in transportation and storage.