Pipeline gas is typically supplied to anesthesia machines at what pressure?

• A. 50 psig
• B. 10 psig
• C. 25 psig
• D. 75 psig

Answer: (A)

Pipeline gas is supplied to anesthesia machines at about 50 psig. This standard pressure provides a reliable and consistent source through hospital piping and gives the machine’s regulator an appropriate input to deliver stable downstream pressures to the flowmeters, vaporizers, and breathing circuit. If the pipeline pressure were too low, sudden increases in demand could cause flow to drop and disrupt delivery; if it were much higher, regulators would carry more load and risk of leaks or regulator failure could increase. The other listed pressures are not the typical pipeline standard, making 50 psig the established value.