AS/NZS 2566.1:1998 (Amd 1:2017) · Structural Design of Buried Flexible Pipelines

Design buried
flexible pipe
to the standard.

The independent guide and free design tool for Australian and New Zealand engineers working to AS/NZS 2566.1. Covers deflection, buckling, ring bending strain — with worked examples and an interactive calculator.

Design Guide
AS2566.1 Structural Design — Complete Guide
Plain-English walkthrough of the standard — soil parameters, load cases, design checks, and the common mistakes engineers make with E'.
E' soil modulus — embedment vs native soil
Deflection, buckling & combined loading
HDPE · PVC · GRP — material selection
AS2566.1 Amendment 2017 — what changed
Read the guide →
Design Calculator
AS2566 Deflection & Buckling Calculator
Enter pipe, soil, and load parameters. Get AS2566.1-compliant results with full step-by-step workings. Free, no login.
Deflection check (Δy/D)
Ring bending strain · Shape factor Df
Buckling (Eqs 5.4(4) and 5.4(5))
Pipe database · Save/load · PDF export
Open calculator →
Standards AS/NZS 2566.1:1998 Amd 1:2017 AS/NZS 2566.2:2002 AWWA M45 ref.
Articles
Technical guides for engineers working with AS2566.1
All articles →
Essential reading12 min
The E' Soil Modulus Problem in AS2566: What the Standard Gets Wrong
AS/NZS 2566.1 incorrectly equates embedment modulus and native soil modulus. For most projects, this changes your deflection result by 20–40%. Here's what the standard gets wrong and how to apply it correctly.
Read article → 2026
Covered in this article
E'e vs E'n — why they're not the same
Leonhardt correction factor ζ
Howard (1977) vs AS2566 Table 3.2
Look & Cameron (2018) — the current consensus
Which value to use on your next project
Design checkComing soon
AS2566 Deflection: Step-by-Step Worked Example
DN300 HDPE gravity sewer — from loads and stiffness to final deflection check with acceptance criteria.
Design checkComing soon
Buckling Check Under AS2566.1: Formula and Interpretation
The buckling failure mode is often overlooked. Covers the two-equation AS2566.1 approach, Rw factor, and B' selection.
For Manufacturers & Suppliers
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We maintain the most complete independent AS2566.1 resource in Australia. If you manufacture buried flexible pipe — HDPE, PVC, GRP, or steel — we'll publish your technical data alongside our design guides with a do-follow link back to your site.
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Your stiffness class data pre-loaded as a selectable option in the calculator
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Manufacturer directory
Pipe manufacturers whose technical data is verified and referenced on this site.
ManufacturerPipe typesDiameter rangeStandardsTechnical dataStatus
Vinidex Pty Ltd
Sydney NSW
 HDPEPVC-UPVC-M DN100–DN1200 AS/NZS 4130
AS/NZS 1477		 Data sheet ↗ Verified
Iplex Pipelines
Melbourne VIC
 HDPEPVC-U DN100–DN900 AS/NZS 4130
AS/NZS 5065		 Data sheet ↗ Verified
Your company could be listed here — submit above, free of charge.