What is the largest size SCH80 PVC Pipe for ASTM D1785?

The largest nominal size for Schedule 80 PVC pipe manufactured under ASTM D1785 is:

24 inches (NPS 24)

Key details

• Standard coverage: ASTM D1785 formally specifies Schedule 80 PVC pipe from 1/8″ through 24″
• Outside Diameter (OD) at 24″: 24.000 in
• Use case: High-pressure industrial, chemical, water, and process piping
• Above 24″: Sizes like 30″ or 32″ are sometimes marketed as “Sch 80–like,” but they are NOT ASTM D1785 compliant and usually fall under custom extrusion or other ASTM standards (e.g., AWWA or SDR-based specs)

Important clarification

If compliance matters (engineering specs, inspections, government or industrial jobs):

Only up to 24″ can be called true SCH 80 PVC per ASTM D1785. At 247Garden, we currently stock up from 1/2 inch to 1 inch schedule-80 PVC pipes. If you are interested, please give us a call 323-318-2600 or text us at this number. Thank you and please have a nice day!

If you want, I can:

• Show pressure ratings at 24″
• Compare ASTM D1785 vs AWWA C900/C905 for large diameters
• Help verify whether a 30″–32″ pipe spec is actually compliant or just nominal

Just tell me what you need next.