Copper Pipe vs. PVC DWV Pipe
Comparing 2 standards across 14 specifications. 14 key differences identified.
Seamless copper water tubing is standardized under ASTM B88 into three primary wall thickness grades: Type K (Green / Heavy Wall for underground mains), Type L (Blue / Medium Wall for standard interior residential plumbing), and Type M (Red / Thin Wall for low-pressure hydronic heating). All three types share identical outer diameters for standard solder, flare, and press fittings.
Schedule 40 PVC DWV (Drain-Waste-Vent) pipe governed by ASTM D2665 is the standard rigid white thermoplastic pipe for residential and commercial gravity sanitary drainage, waste discharge, and sewer venting. Engineered with smooth non-porous bore walls to prevent clogs, it joins via chemical solvent cement welding.
Specification Comparison Table
14 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standard
|
ASTM B88 / NSF 61 | — |
|
Type K (Green Stripe)
|
Heavy wall: 1/2" = 0.049" (1.24 mm) | 3/4" = 0.065" (1.65 mm) wall | — |
|
Type L (Blue Stripe)
|
Medium wall: 1/2" = 0.040" (1.02 mm) | 3/4" = 0.045" (1.14 mm) wall | — |
|
Type M (Red Stripe)
|
Thin wall: 1/2" = 0.028" (0.71 mm) | 3/4" = 0.032" (0.81 mm) wall | — |
|
Outer Diameter Formula (CTS)
|
Actual OD = Nominal Size + 1/8 inch (0.125") | — |
|
Joining Methods
|
Capillary solder (sweat), ProPress copper crimp, flare, compression | — |
|
Operating Temperature
|
Up to 400°F (204°C) continuous in hydronic heating | — |
|
Governing Standards
|
— | ASTM D2665 / ASTM D1785 / CSA B181.2 / NSF-dwv |
|
1-1/2" DWV Dimensions
|
— | OD: 1.900" (48.3 mm) | Min Wall: 0.145" (3.68 mm) | Sinks, tubs, showers |
|
2" DWV Dimensions
|
— | OD: 2.375" (60.3 mm) | Min Wall: 0.154" (3.91 mm) | Washing machines, floor drains |
|
3" DWV Dimensions
|
— | OD: 3.500" (88.9 mm) | Min Wall: 0.216" (5.49 mm) | Water closets (toilets), soil stacks |
|
4" DWV Dimensions
|
— | OD: 4.500" (114.3 mm) | Min Wall: 0.237" (6.02 mm) | Main building sewer drain |
|
Primary Joining Method
|
— | Purple primer + solvent cement (chemical molecular fusion weld) |
|
Maximum Operating Temperature
|
— | 140°F (60°C) continuous service |