Global Rotomoulding

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Vinidex

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To Whom It May Concern

Following are results of design calculations for DN900 StormPRO twin walled polypropylene corrugated pipe (as used in the Vinidex AquaPRO® underground water retention systems), in accordance with AS/NZS 2566.1 “Buried flexible pipelines. Part 1: Design”. The calculations are based on the following assumptions:

Pipe diameter and class – DN900 StormPRO manufactured to AS/NZS 5065
Depth of cover – 750mm
Trench width – 1700mm
Native soil type – clayey sand, sand clay mixture (SC), En = 2 MPa
Embedment soil type – 5mm – 10mm gravel compacted to 90% dry density, Ee = 7 MPa
Traffic loading – Austroads W7 + T44 multi-lane wheel loads

Results:
Pipe stiffness – 8,000 N/m/m (ie. SN 8)
Maximum deflection at 50 years – 3.7%
Factor of safety against buckling – 3.5 (≥ 2.5 is considered safe)

WSAA has appraised Vinidex AquaPRO® pipe (StormPRO) and assigned it a Class A Rating which translates to being given a 100 year life before rehabilitation is required.