Final answer:
A gas technician is typically responsible for pressure testing a newly installed piping system in accordance with Gas Code requirements.
Step-by-step explanation:
When it comes to ensuring that a newly installed piping system is pressure tested in accordance with Gas Code requirements, the responsibility generally falls on the gas technician. This professional must adhere to local codes and standards, which include practices for the installation and pressure testing of gas piping systems. The pressure test is critical for verifying the integrity of the piping system and ensuring that there are no leaks, which could lead to serious safety hazards. It is not typically the responsibility of the homeowner, gas distributor, or appliance manufacturer, though regional regulations and specific contracts can affect exactly who bears the responsibility.