What is the appropriate area for running piping in a single trench according to installation practices?

The appropriate area for running piping in a single trench during installation practices is related to the dispensing area. This encompasses the necessary considerations for safely transporting fuel or other liquids from storage tanks to dispensing units at service stations or similar facilities.

In the context of installation, the dispensing area must be properly designed to ensure that the piping systems are not only efficient but also compliant with safety regulations. Running the piping in a designated dispensing area helps to minimize the risks associated with leaks, spills, and other environmental hazards while ensuring easy access for maintenance and monitoring.

In comparison, options such as retrofitting, convoy, and interstitial-spacing do not pertain directly to the specific practice of running piping in a trench for dispensing fluids. Retrofitting relates to upgrading existing systems rather than the initial installation practices. The convoy concept involves multiple systems or components working together but is not specific to trenching for piping. Interstitial-spacing typically refers to the space between inner and outer containment but does not directly address the installation practices for piping in trenches meant for dispensing purposes. Thus, focusing on the dispensing area captures the essence of safe and effective piping installation practices.