What should be done with the venting of CNG?

Answer: B — It must occur in open areas

The proper procedure for venting CNG is that it must occur in open areas. This is crucial because CNG is lighter than air and will rise when released. Venting in open areas allows for the safe dispersal of the gas into the atmosphere, minimizing any risk of accumulation that could lead to hazardous situations, such as explosions or asphyxiation in confined spaces. By venting CNG in open spaces, it ensures that the gas does not build up to hazardous levels, which is especially important because enclosed or confined spaces can lead to an increased concentration of flammable gases. The regulations and safety protocols surrounding CNG handling emphasize minimizing risks, and venting in open areas helps achieve this goal.