What must be placed on all inlets and outlets of NH3 components?

The requirement to place stop valves on all inlets and outlets of NH3 (ammonia) components is based on safety and operational control. Stop valves serve the purpose of completely shutting off the flow of ammonia when necessary, allowing for maintenance, emergency shut-off situations, or isolation of specific system segments.

This is particularly critical in high-pressure piping systems where the safe management of hazardous materials like ammonia is essential. Implementing stop valves ensures that operators can quickly and effectively respond to leaks or malfunctions, maintaining safe operating conditions.

While check valves, ball valves, and relief valves perform important functions within a piping system, they do not provide the same level of control as stop valves. Check valves are designed to prevent backflow, ball valves are often used for quick on/off control but might not provide a complete shut-off in every situation faced with ammonia, and relief valves are essential for pressure regulation but do not control flow in the same capacity as stop valves do. Therefore, the correct choice emphasizes the critical need for reliable control and safety in handling NH3.