PVC (PSM) sewer pipe must be marked with the manufacturer's name or trademark, nominal pipe size, and other identifying information at intervals of ___ feet or less.

PVC (PSM) sewer pipe must be marked with the manufacturer's name or trademark, nominal pipe size, and other identifying information at intervals of ___ feet or less.

• A. 2 feet
• B. 5 feet
• C. 8 feet
• D. 10 feet

Answer: (B)

The key idea is that PVC sewer pipe must carry identifying markings at regular, short intervals to allow quick verification of who made the pipe, its nominal size, and other important details while it’s in the trench or stored on site. Those markings help inspectors and crews confirm the correct material is being used and track it for any quality or compatibility checks. Five feet or less is the standard interval because it ensures a readable mark is readily accessible anywhere along a run of pipe, even after sections are cut or joined. This frequent identification supports proper material selection, traceability, and compliance with specifications, which is especially important for sewer installations where correct sizing and source matter for performance. Longer intervals would make it harder to verify the pipe’s size and source in the field, while much more frequent markings would be unnecessarily burdensome. The five-foot requirement strikes the right balance for practical field use.

The key idea is that PVC sewer pipe must carry identifying markings at regular, short intervals to allow quick verification of who made the pipe, its nominal size, and other important details while it’s in the trench or stored on site. Those markings help inspectors and crews confirm the correct material is being used and track it for any quality or compatibility checks.

Five feet or less is the standard interval because it ensures a readable mark is readily accessible anywhere along a run of pipe, even after sections are cut or joined. This frequent identification supports proper material selection, traceability, and compliance with specifications, which is especially important for sewer installations where correct sizing and source matter for performance.

Longer intervals would make it harder to verify the pipe’s size and source in the field, while much more frequent markings would be unnecessarily burdensome. The five-foot requirement strikes the right balance for practical field use.