TRENCHLESS TECHNOLOGY |
A typical cross section through the construction of an InsituMain lining
After successful removal of the curing water, the ends of the liner are removed. The lined pipe section between the newly installed flange spool pieces is removed and then at each of these points, a liner end seal is installed. This
process end into involves
cutting back the lined pipe to a pre-determined measurement flange
from the liner and the the host
pipe which allows the fitting of internal end seals and provides a seal between the
host
pipe preventing any water intrusion between them. The
seal consists of a
custom-manufactured EPDM rubber gasket straddling the edge of the liner which is compressed by an internally expanded stainless steel ring.
Various end seal and termination arrangements are available enabling Insituform to offer clients different options. Each
individual ensuring lined
length is then pressure tested to clients’ specifications by ITL using accepted CIPP standards
that
The platform is constructed centrally over the insertion/ start pit at one end of the lining run.
An inversion ring, which holds the beginning of the liner in position during inversion, is secured at the deck level of the platform.
Inversion Process Should a circumstance arise where height, space or access is limited, other inversion systems are available that enable the inversion pressure to be applied without the need for a tower structure.
The liner is then hoisted
up to deck level and fed through the inversion ring using a crane. The open end of the turn-back is pulled over the inversion ring and securely strapped to the ring.
To invert the liner, water is introduced through the inversion ring. The weight of the water maintains the pressure
head at a level
sufficient to progressively turn the liner inside out as it passes through the host pipe.
Half way through
the inversion process, a circulation hose and loading strap is connected to the
free end of the liner. The inversion continues and the liner pulls the circulation hose and strap through the system.
Lining the full length of the pipeline through the various excavation pits is possible which enables long installation lengths to be achieved. Care at the excavation pits is taken to ensure the liner passes through
these without damage.
When the liner reaches the stop-end / reception excavation, the inversion is complete.
The free end of the liner is points
supported in the reception pit to prevent it bursting before the curing process is completed.
Prior to the inversion process, the crew
places thermocouple
wires between the host pipe and the liner. This allows the lining crew to take temperature readings at each stage of the curing process. The
circulation hose
is then connected to an Insituform boiler unit and the water in the liner is heated and circulated to cure the liner in place. The water temperature
The UK’s First Engineering grade locator system EZiSYSTEM xf Features
Multiple Frequencies (including 512Hz & 640Hz) Current measurement reading High output generator option (3 watt)
Data Logging option Bluetooth connectivity option Depth option – increased to 9.9 metres in Sonde mode
Affordable, intuitive location system designed to deliver the functionality of more complex and expensive systems with significant cost savings and ease of use.
Rechargeable battery option UK Network Rail approved
Benefits
Easily locates low frequency camera Sondes and services over a greater distances
Enables improved tracing and identification of an individual service in congested site situations
Easily locates deeper services over greater distances Enables tracing of ‘hard to find’ services such as large diameter pipes and insulated joint pipes Monitors user behaviour helping to identify training needs and record site activity
Enables convenient, wireless communication with mapping devices
Enables the depth of deeper sewer lines to be estimated benefitting camera and sonde users
Offers the user an environmentally friendly, low cost, high performance alternative to secondary batteries such as Alkaline
All xf- series products have been approved for use on Network Rail sites
Insituform
and the temperature between the liner and the host pipe are regularly monitored
using the
thermocouple wire. A pre- determined curing schedule is followed so that the proper cure of the installed InsituMain liner is ensured.
Disposal point At the end of the cure schedule, the curing water in
the liner is cooled.
Once it is at the required temperature, the water is discharged into a foul sewer or tankered away to a previously agreed upon and suitable disposal point.
the system is secure, leak
free and has achieved the required pressure rating. A final CCTV survey is carried out over the entire lined length using a pan and tilt camera to confirm a successful installation has been achieved.
After each individual section has passed the pressure test, using new or existing pieces of pipe, valves or branches, the line is reinstated and reconnected. The
whole refurbished
length is then pressure tested to confirm no leakage and compliance with the required specifications. ■
The NEW trailer with BIG savings
The 90/500 Pipe Coil Trailer is the first trailer of its type capable of transporting and dispensing a 500 metre coil of up to 90mm diameter PE, SDR 17.6
A safer, more efficient and quicker method of loading, transporting
and dispensing PE
Long pushes/pulls are made quick and easy
Pipe wastage is dramatically reduced when used on a number of jobs - long and short lengths Savings on pipe wastage of up to 15-20% are achievable
Hydraulically raised, the drum design makes dispensing smooth and effortless
Manoeuvrability is simple due to the single axle and its laden weight of under two tonnes
cabledetection.co.uk
Contact us for more information: Steve Vick International Ltd Unit 4 Pinesway, Ivo Peters Road, Bath, BA2 3QS
Tel: 01225 480 488 email:
info@stevevick.com
December 2013 | WET News | 15
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