How do you select the appropriate PE pipe specifications?

1. Select material grade
PE100 is recommended for water supply and mandatory for gas pipelines. PE80 is acceptable for low-pressure irrigation. Potable water pipes shall adopt food-contact raw materials.
2. Confirm nominal pressure PN
Choose proper SDR series according to working pressure. Smaller SDR means thicker wall and higher pressure resistance. Common ratings: PN0.6, PN0.8, PN1.0, PN1.25, PN1.6.
3. Determine outer diameter OD/DN
Calculate pipe size based on flow rate and flow velocity. The recommended velocity for water supply is 0.8–1.5 m/s. Gravity sewage pipelines depend on pipeline gradient. Gas pipe diameter is matched with gas transmission volume.
4. Evaluate service environment
• Buried installation: consider soil load and ground settlement;
•Outdoor exposure: UV-stabilized HDPE is required;
•Low-temperature areas: high-toughness PE100 is preferred;
•Chemical medium: verify resistance to acids and alkalis.
5. Select connection method
Hot socket fusion fits small sizes DN20-DN110. Electrofusion fittings are widely adopted for large-diameter networks and gas projects for higher safety.
6. Comply with relevant standards
ISO 4427 for water supply PE pipes; ISO 4437 for gas distribution pipelines.