Hydraulic Design

Hydraulic properties of IntegraPipe

The hydraulic characteristics of smooth bore, high density polyethylene pipes are extremely good, providing maximum efficiency and durability.

Roughness (ks)

The roughness coefficient of HDPE for calculations using the Colebrook-White formula is 0.03 ks. However, ‘Sewers for Adoption’ and certain other standards or codes of practice state that a general roughness figure of 0.6 ks should be applied, irrespective of pipe material. Where this figure is applied, IntegraPipe will in all cases function much more efficiently than the calculated design flows.
If the Mannings equation is used, a roughness coefficient of 0.01 ks should be applied.

Chemical Resistance

The HDPE bore of IntegraPipe offers excellent resistance to all substances that would routinely be discharged into drainage systems, including water with high saline content, fuels, acids and most chemicals. Additionally, unlike concrete based products, polyethylene is completely resistant to sulphates and can therefore provide significantly better long-term performance.
Further information related to chemical resistance and a performance against a comprehensive list of specific chemicals is available is available to download here.