Pressure building sewers shall schedule which PVC pipe and fittings?

Pressure building sewers require specific types of PVC pipe and fittings that can withstand higher pressure ratings. The correct answer, which is schedule 80, indicates that this type of PVC is designed to handle more substantial pressure conditions than other schedules like schedule 40.

Schedule 80 PVC has a thicker wall compared to schedule 40, which allows it to sustain higher internal pressures and be effectively used in applications such as pressure-building sewers. This additional wall thickness not only increases the pipe's pressure ratings but also enhances its overall durability against mechanical stresses, making it suitable for areas where pressure fluctuations may occur.

While lower schedule numbers like 40 are standardized for many general plumbing applications, they lack the pressure rating required for more demanding situations that schedule 80 caters to. Thus, for pressure building systems, using schedule 80 is essential to ensure structural integrity and safety.