Describe the best practices for safe commissioning of a new gas-handling system, including essential tests and validations that should be performed before placing the system into operation.

The safe commissioning of a new gas-handling system is a critical process that involves a series of well-defined steps and meticulous validation procedures to ensure the system operates safely and reliably before it is put into service. These best practices cover the entire commissioning phase, from initial checks to final operational tests, focusing on safety, functionality, and adherence to regulatory standards. First, a thorough review of all design documents and specifications is essential. This step involves verifying that the system's design meets the required standards and codes, and that all equipment is specified correctly for its intended purpose. This includes reviewing the process flow diagrams (PFDs), piping and instrumentation diagrams (P&IDs), equipment specifications, and material safety data sheets (MSDS) for all gases involved. For example, before commissioning a new hydrogen gas storage system, the piping design must be reviewed against all relevant codes for hydrogen gas handling, verifying material compatibility and ensuring the system is appropriate for the working pressure and temperatures. Next, a detailed pre-commissioning checklist should be completed, ensuring that all components have been correctly installed and are in proper working condition. This checklist should cover all aspects of the system, such as verifying the proper installation and orientation of valves, regulators, pressure gauges, and other instruments, ensuring correct wiring and connection of electrical components and control systems, and confirming the availability of all required safety devices, such as gas detectors and emergency shut-off valves. This stage....