AWWA C906 is the American Water Works Association standard for polyethylene pressure pipe and fittings, 4 in through 65 in, for waterworks. Where ASTM F714 describes the product, C906 describes it for the utility buyer: it fixes the material at PE4710 or PE3608, defines pressure classes for water service, sets the surge allowances, and adds the marking and quality requirements a municipal specification needs. Its small-size companion is AWWA C901, for ¾ in to 3 in service lines.
C906 pipe is rated by pressure class, PC, in psi at 73 °F — PC 200 for DR 11 PE4710, PC 160 for DR 13.5, PC 125 for DR 17, PC 100 for DR 21 — using the same HDB and design factor as ASTM. What the standard adds is an explicit surge rule: recurring surges up to 1.5 × PC and occasional surges up to 2.0 × PC are permitted without derating, because polyethylene's low modulus absorbs pressure transients that would require a higher class in a rigid material. That rule is why PE is chosen for pump-station discharge and long transmission mains with valve-closure events.
Sizes follow IPS or DIPS outside diameters as in ASTM F714, with DIPS common on utility projects because it lets HDPE connect to ductile iron valves and fittings and slip-line existing iron mains. Pipe for potable service must additionally be certified to NSF/ANSI 61 for health effects — a separate listing granted to the compound and the manufacturer, not implied by C906.
We produce C906 pipe in PE4710 from 4 in to 63 in, IPS and DIPS, marked with the standard, pressure class, DR, material designation and production code the standard requires, and can supply the NSF 61 compound listing with the batch certificate. State the pressure class and OD series in the enquiry; the wall thickness follows from them.
Key features
- 4 in through 65 in; AWWA C901 covers ¾ in to 3 in
- Pressure classes PC 63 to PC 335 at 73 °F, PE4710 or PE3608
- Surge allowance: 1.5 × PC recurring, 2.0 × PC occasional, without derating
- IPS and DIPS outside diameters; DIPS for ductile-iron compatibility
- NSF/ANSI 61 listing required separately for potable water
Specifications
| Full title | Polyethylene (PE) Pressure Pipe and Fittings, 4 In. Through 65 In. (100 mm Through 1,650 mm), for Waterworks |
|---|---|
| Materials | PE4710 (HDB 1,600 psi), PE3608 (HDB 1,600 psi, PE3xxx) |
| Pressure classes | PC 63 to PC 335 psi at 73 °F by DR |
| Surge allowance | Recurring 1.5 × PC; occasional 2.0 × PC |
| OD series | IPS and DIPS |
| Potable water | NSF/ANSI 61 listing required in addition |
| Companion standards | AWWA C901 (small sizes), ASTM F714 / D3035, ASTM D3261 / F1055 fittings, AWWA M55 manual |