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plumbing Engineering Reference Matrix

Schedule 40 vs Schedule 80: PVC Pipe Wall Thickness, Flow Capacity & Burst Pressure

Schedule 40 and Schedule 80 pipe share identical outer diameters (OD) for fitting compatibility, but Schedule 80 features substantially thicker walls, delivering higher hydrostatic pressure ratings at the expense of reduced internal diameter (ID) and flow volume.

Governing Formula: Barlow's Formula: P = (2 * S * t) / D_outer

Technical Comparison & Conversion Matrix

Nominal Pipe Size (NPS) Sched 40 Wall (in) Sched 40 PSI (73F) Sched 80 Wall (in) Sched 80 PSI (73F)
1/2 inch 0.109 in 600 PSI 0.147 in 850 PSI
1 inch 0.133 in 450 PSI 0.179 in 630 PSI
2 inch 0.154 in 280 PSI 0.218 in 400 PSI
3 inch 0.216 in 260 PSI 0.300 in 370 PSI
4 inch 0.237 in 220 PSI 0.337 in 320 PSI
Embedded Edge Calculation Engine

Live Calculator: Schedule 40 Steel Pipe Dimensions & Weight Calculator (ASME B36.10M)

Compute conversion ratios and values instantly on the Cloudflare edge runtime.

Computed Output

Outside Diameter (OD in)
2.38 in
Wall Thickness (t in)
0.15 in
Inside Diameter (ID in)
2.07 in
Plain End Unit Weight
3.65 lbs/ft
Total Pipe Run Weight
73.06 lbs
Internal Flow Area
3.36 sq in
Water Volume Capacity
0.17 gal/ft

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Schedule 40 Steel Pipe Dimensions & Weight Calculator (ASME B36.10M)

Calculate nominal pipe size (NPS), outside diameter (OD), inside diameter (ID), wall thickness, cross-sectional area, and linear weight per foot for ASME B36.10M / ASTM A53 carbon steel pipes.

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Frequently Asked Questions

Can Schedule 40 and Schedule 80 PVC fittings be interchanged?

Yes, because outer diameters are standardized. Schedule 80 fittings can be cemented to Schedule 40 pipe, though system pressure rating is always limited to the weakest component.

Why is Schedule 80 colored gray while Schedule 40 is white?

The gray coloration signifies industrial-grade heavy-wall PVC with enhanced UV stabilizers for outdoor and chemical process applications, whereas white Schedule 40 is intended for residential potable and drainage plumbing.