Approval

This letter is in response to your submission earlier this year, requesting VicRoads to consider RIB LOC Series 2000 Drainage Pipes for project use.

Your attention is drawn to Road Design Note 7-10 of 9 December 98, for High Density Polyethylene Structured Wall Pipes. This note sets out the structural design notes and references to AS/NZS 2566.1:1998 Buried Flexible Pipes Part 1: Structural Design. Also included are the advantages and disadvantages of polyethylene type drainage pipes.

RIB LOC Series 2000 does have the added advantage of helical steel reinforcement.

The use of RIB LOC Series 2000 high density, steel reinforced, polyethylene structured wall drainage pipe is considered suitable for VicRoads projects on the following conditions:

(a) The Project Manager has sole discretion as to approval for the use

(b) The design should be carried out by a registered engineer following:

• Reference to AS/NZS 2566.1:1998
• Reference to VicRoads, Road Design Guide Part 7, Section 7
• Reference to manufacturer’s specifications.
• Matters which may require specific attention are:
• Deflection on settlement of pavement
• Cover from top of subgrade to top of pipe
• Replacement of poor abutting material with higher grade materials to improve the combination soil modulus to acceptable values
• Chemical and fire resistance
• Temperature variations
• Buoyancy
• Direct sunlight
• Site installation and pipe installation shall be carried out in accordance with the supplier’s instructions.

Yours faithfully

JOHN BYRDEN
PRINCIPAL ROAD DESIGN ENGINEER
VicRoads design