Factory installed inlet tubing on station outlets shall not be less than what NPS?

The standard size for factory-installed inlet tubing on station outlets is determined by various factors, including the flow capacity and the type of gas being delivered. The correct choice indicates that a minimum nominal pipe size (NPS) of 1/4 inch is typically acceptable for inlet tubing on these outlets. This size has been established to ensure adequate pressure and flow for medical gases, while also accommodating the necessary connections to various medical equipment without creating unnecessary restrictions.

Using a smaller size, like 1/4 inch, meets the design criteria for medical gas systems, which must reliably deliver gases to patient care areas. Larger sizes, such as 3/8, 1/2, or 5/8 inch, although they may be used in certain circumstances, are not necessary for situations where 1/4 inch can adequately perform the required function. This is important for maintaining efficiencies in medical gas delivery systems, ensuring that pressures remain consistent and safe for patient use.