What is the minimum schedule thickness for PVC piping in level 3 vacuum systems?

The minimum schedule thickness for PVC piping in level 3 vacuum systems is specified as Schedule 40. This requirement is based on the need for adequate strength and durability when dealing with vacuum pressures. Schedule 40 PVC has a thicker wall compared to lower schedules, which allows it to handle the negative pressures found in vacuum applications more effectively. This level of thickness helps prevent collapse or failure of the piping under vacuum conditions, ensuring safety and reliability in the system's operation.

In contrast, lower schedule thicknesses, such as Schedule 20 or Schedule 30, do not provide the necessary structural integrity for these applications, which may lead to severe risks, including pipe failure. Schedule 50, while thicker than Schedule 40, is not typically required for level 3 vacuum systems, making Schedule 40 the appropriate choice for meeting the specific demands of such installations.