How many feet of clear space must be provided for access to all valves and fittings of multiple groups of cylinders?

The requirement for providing three feet of clear space around valves and fittings of multiple groups of cylinders is based on safety standards and regulations governing the handling of compressed gases, such as CNG. This distance is crucial for several reasons:

Firstly, having three feet of clear space ensures that personnel can easily access and operate the valves and fittings without obstruction. This is important in emergency situations where quick access to valves may be necessary to shut off gas flow or to address leaks.

Secondly, this distance helps to minimize the risk of accidents or injuries that could occur if valves and fittings are not accessible. Adequate spacing allows for the movement of equipment and personnel, facilitating maintenance and inspection processes effectively.

Additionally, the three-foot clearance helps to mitigate the potential for a confined space hazard, ensuring that individuals can respond safely if there is a problem with the cylinder groups.

In contrast, the other options for less clearance—two feet, four feet, and five feet—do not meet the established safety standards, which specifically dictate the necessity of three feet for practical access and emergency readiness. The three feet of clearance strikes a balance between accessibility and safety, making it the standard requirement in the industry.