Final answer:
The maximum pressure drop allowed by the codes for a natural gas piping system with a supply pressure of 5 psi depends on the specific code being followed.
Step-by-step explanation:
The maximum pressure drop allowed by the codes for a natural gas piping system with a supply pressure of 5 psi depends on the specific code being followed. Generally, the maximum pressure drop is recommended to be around 1 psi. However, it is important to check the specific code in your jurisdiction for the exact allowable pressure drop.