What is the minimum testing requirement for piping systems carrying flammable and combustible liquids?

The minimum testing requirement for piping systems carrying flammable and combustible liquids is that they must be hydrostatically tested to 150% of the maximum intended operating pressure. This requirement is set to ensure the integrity and safety of the piping systems under operating conditions. Hydrostatic testing involves filling the system with water and pressurizing it to a level 50% above the maximum pressure it will experience during normal operations.

This rigorous testing process helps identify any leaks, weaknesses, or potential failures in the piping systems before they are put into use, thus preventing hazardous spills or failures that could lead to fire hazards or environmental contamination. Carrying flammable and combustible liquids increases the risks associated with their transport, making thorough testing a critical safety measure.

The other options do not meet existing standards and regulations applicable to flammable and combustible liquids, which are designed to enhance safety in their handling and transport.