The air pressure relief pipe from a pneumatic sewage ejector must be a minimum of how many inches in size?

• A. 1 inch
• B. 1 ¼ inches
• C. 1 ½ inches
• D. 2 inches

Answer: (B)

The minimum size for the air pressure relief pipe from a pneumatic sewage ejector is 1¼ inches. This dimension is specified to ensure adequate venting, which is crucial for preventing pressure build-up in the system during operation. Proper sizing of the relief pipe allows for efficient flow of air and prevents issues such as siphoning or vacuum formation that could disrupt the performance of the ejector. If the pipe were smaller, it might not be able to adequately handle the pressure fluctuations associated with the operation of the ejector, potentially leading to system failures or malfunctions. Therefore, adhering to the 1¼ inch minimum size ensures that the system operates safely and effectively.