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1.2 Non-invasive Renewal (Enlarging) Of Pipes

Technical Description

This technology, also known as one form of trenchless technology, allows the for non- invasive replacement of an existing pipeline. Replacement is accomplished by inserting an hydraulic tool into an existing pipeline. As the hydraulic tool is moved along the pipeline, the application of hydraulic pressure causes the head of the tool to expand, destroying of the old pipe. As a consequence, a new pipe of the same or larger diameter may be hydraulically inserted into the space in which the old pipe was located. The technique is considered non-invasive as there is little disruption of the land surface, with all hydraulic operations being undertaken through relatively small excavations at intervals along the pipeline route. This is in contrast to the more common surface excavation methods.

Extent of Use

This is innovative method gradually coming into use in Poland and Latvia.

Level of Involvement

This technology is generally implemented construction firms, service or utility agencies, and local governmental administrations.

Operation and Maintenance

This technique is used in the non-invasive breaking of cast-iron, stoneware, concrete, and asbestos pipes, and is best operated by specialist contractors. The technique employs specialised equipment. Because this technology is often used in conjunction with a pipeline renewal project, it would be important to ensure that complementary hydraulic methods of inserting new piping be available.

Costs

Relatively to diameter of pipe and nature of the ground in which the original pipeline was laid, costs of using this technique range between $160 and $320/m of pipe. This cost is still not competitive relative to traditional, surface excavation methods for general use.

Effectiveness of the Technology

This is a very effective method of renovating pipeline system, and is especially useful in confined urban areas where surface excavation may not be possible or desirable.

Suitability

This method can be used in all countries of the region.

Advantages

This technique has few environmental consequences and is much less disruptive to business and industry than comparable surface excavation techniques. Pipe networks that have become corroded can be renewed in place, while pipe networks that are undersized for current demands can be replaced without removing the old pipeline, which could reduce the amount of time customers are without service. Because most of the renewal in carried out underground, the pipeline project can be completed with minimal disruption of business operations.

Disadvantages

No disadvantages have been identified, although the technique currently is more expensive for general application than surface excavation.

Cultural Acceptability

This innovative method is being increasingly accepted by civil engineering societies. The limited surface excavation also typically means that this technology is well accepted by the general public, who are less inconvenienced by this technique.

Further Development of the Technology

There is a need for the benefits of using this technology to be made more visible to contractors and consumers.

Information Sources

Reno Rur Centrum Sp. z o.o., Kielce, ul. Warszawska 34, skr. poczt. nr 624 Poland, Tel. (048-41) 411-41 w. 286, Tel./fax: (0-48 - 41) 44-330,

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