1. Pipe Inspection and Trenchless Rehabilitation WIOG May 2017
Mark Hughes and Dave Neru

2. Coming Up…
Company Overview
Pipe Rehabilitation
Clean and Survey

3. Company Overview New Zealand Owned Group of Companies
Operating for over 20 years
Over 200 staff
Technology specialists in:
Pipe line condition assessment and rehabilitation
SW and WW Networks operations, maintenance and management
Branches in Whangarei, Auckland, Hamilton, Blenheim and Christchurch

4. Pipe Rehabilitation

5. Trenchless Methods Fold and Form Spiral Plastic Cured In Place (CIPP)
UV CIPP
Pipe Bursting
Directional Drilling
Micro Tunnelling
Pipe Jacking
Grouting
There are a number of rehabilitation methods used in New Zealand. The common civil trenchless construction methods are pipe bursting, pipe jacking and directional drilling.
The common trenchless lining products are Fold and form, Spiral plastic and CIPP.
Lining has been used in New Zealand for over 30 years and has recently come to the forefront in recent times as the rehabilitation method of choice after the Christchurch earthquakes. – an estimated 300 kilometers of network in Christchurch has been rehabbed with lining products.
It should be noted that Christchurch lining design criteria of having a fully deteriorated host pipe, in fluid soils in flood conditions, was never heard of in the world of lining up this event.

6. Limited only by Pipe Material
Renewal Comparison Methods
Method
Diameter
Impacts
Application
Pipe
Material
Gravity
Pressure
Open Cut
I, S 
Limited only by Pipe Material
PVC, PE, MSCL, DICL, GRP, Composites
Pipe Bursting
Up to PN25
PE,
Restrained Joint PVC
Slip Lining L
PE, PVC
Relining
(CIPP, Fold & Form, Spiral Wound) M
CIPP up to PN12
PVC, Proprietary Reinforced Soft Liner & Resin Combinations
Close Fitting PE
(Compact Pipe, Swage, Sub-line, etc)
Up to PN12.5 PE
Legend: I = Increased, S = Size for Size, L = Larger Reduction, M = Minimal Reduction
With everything there are limits to methodologies. Basically ling is no good where you want to increase capacity of a service.
Structural properties will vary between products with fold and form and spiral plastic being constrained to manufactory process, whereas CIPP can be made to design.

7. Pre treatment required
Identify Suitable Lining Methods
LINING Suitability
FOLD & FORM
CIPP
CLOSE FIT SPIRAL WOUND
Reticulation sewer ( mm dia)
Yes
Branch sewer (>300mm dia.) No
Maximum Installation length on 150mm diameter
135mtrs
250mtrs
100mtrs
Maximum Installation length on 225mm diameter
120mtrs
300mtrs
Maximum Installation length on 300mm diameter
110mtrs
500mtrs
Maximum Installation length on 375mm diameter NA
Maximum Installation length on 450mm diameter
400mtrs
Suitable to line Bends up to 90 degrees
Suitable to line sewers with multiple drop joints
Suitable to line sewers with multiple grade variations
Suitable to line sewers with running infiltration
Pre treatment required
Pre liner advisable
Reticulation sewer Bypass required
Branch sewer Bypass required
High flows only
Liner water wall Thickness
4 to 7mm
4 to 27mm
1 to 3mm
- Each lining product has limits that will be based on installation certainty.
- The more ridged the product the more installation barriers it will face.
- All products face issues with running water and all have methods to over come this issue such as pre liners, pre patching etc

8. Fold and Form PVC  structural lining system to ASTM1504
 service life in excess of 50 years
 uniform wall PVC pipe construction
 no joints
 installed in intimate contact to the pipe
 no annular spaces behind the lining
- Today we are going to discuss PVC fold and form and a installation project in Cashmere Christchurch.

9. Fold and Form PVC – Cashmere Project
3 Line 150mm Lines
In the bush
Step gradient
Limited access
Behind Properties  
Equipment Access
Manholes US DS
- 3 x 150mm lines spanning around 160 meters, down a step gully behind flash houses
Access was down a narrow drive way some 300 meters long
The plant and equipment used for PVC fold and form is a large steam generator (1x 6 wheeler truck) 1x hydraulic winch and associated generator, power pack etc ( 2nd 6 wheeler truck) and a platform carousel (1x ute and trailer)
Additional a robotic cutter unit is also required

10. Fold and Form PVC – Cashmere Project
Special Trolley System
Adjustment of crane system
- A special trolley was design and build to get the carousel down the bank and a crane truck modified.
We wanted to remove as many person from the moving and placing the product on site
With all lining it’s the access and placing of plant and equipment the provide the challenge. The process and procedure of lining is not complicated and is very repetitive.

11. Fold and Form PVC – Cashmere Project
Hangi on!
Steam use to heat coil  
- We eased the carousel down with the crane truck and only had to shimmy the carousel a little to get in-between the flowers.

12. Fold and Form PVC – Cashmere Project
Feeding Time
- It takes about minutes to heat the PVC coil to a malleable state to feed into the host pipe.
- Once this is achieved the product is able to move through bends and manhole channels

13. Fold and Form PVC – Cashmere Project
Feeding Time
Once through to the other side, expansion plugs are inserted into both ends ready for expansion
The product cools slightly when feed into the host pipe, so some time is taken to heat the product to a malleable state again

14. Fold and Form PVC – Cashmere Project
After a feed its time to expand!
Note slight over expansion of the Fold and Form EX pipe which confirms complete expansion & also mechanically ‘locks’ lining into place.
Once the product has reached a malleable state and the outside of the product has reached the desirable temperature the DS value is closed off and the expansion process begins
The steam raises the temperature insider the EX creating pressure which expand the pipe
It is held and certain increments to ensure full expansion along the entire length of pipe
Once full expansion is achieved air rapidly replaces the steam and the cool down period begins

15. Fold and Form PVC – Cashmere Project
All done – satisfied!
- Once cool down has finished hours then the cutting open of junction and end seals are completed

16. Fold and Form PVC – Cashmere Project
Summary of wins
Health and Safety issues minimised
Pull throughs - reduce set ups (movement of equipment)
Less disruption to home owners
Environmental friendly
Only reinstatement in manholes (end seals)
Cashmere Team won SICRT Environmental, Health and Safety and Quality Award

17. Pipe Inspection

18. Pipe Cleaning & Inspection
Walkthrough and CCTV Asset Condition Assessment
History Of CCTV
Technology advancement
Personal profile
Asset condition assessment

19. Pipe Cleaning
Why we clean
Methods
Equipment

20. Pipe Cleaning
Root cutting
Hydro excavation

21. Pipe Cleaning
Recycling
technology

22. Pipe Inspection Technology and Equipment Pipe inspection equipment
Laser Profiling
Gas attack

23. 3 hours continuous recording Over 2,000m line length
2x digital zoom
High Resolution
3 hours continuous recording
Over 2,000m line length
Only limited by tether (rope) availability

24. Pipe Inspection
Walkthrough
Why
H&S
Waimakariri tunnel

25. Pipe Inspection
Traditional CCTV equipment
Summary

26. Questions?