What is the minimum NPS for vacuum system mains/branches?

The minimum nominal pipe size (NPS) for vacuum system mains or branches is 3/4 inch. This is established to ensure that the system can effectively manage the flow of gases and maintain an adequate vacuum pressure. A larger pipe diameter provides enough capacity to handle the anticipated volume of gas, while still maintaining the efficiency of the vacuum system.

Using a 3/4 inch pipe minimizes the risk of restrictions or blockages that could impede the flow of gases in the system. Additionally, if the pipe size is too small, it can lead to increased friction losses, making the vacuum system less efficient in operation. Therefore, 3/4 inch is specified as the standard to balance flow capacity and effective performance in medical gas systems.