Measuring and testing – With fluid pressure – Leakage
Patent
1997-02-27
1998-10-06
Williams, Hezron E.
Measuring and testing
With fluid pressure
Leakage
73 491, G01M 308
Patent
active
058179267
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a method for monitoring the tightness of pipelines, in particular sewer line systems, and a device for carrying out the method.
Stoneware for drainage purposes is standardized in DIN 1230, for example in the publication of the edition of January 1986. Sewer pipeline systems are nowadays increasingly being laid inside water protection areas. This process requires particular care that no sewage emerges from the pipes and shafts and pollutes the groundwater and makes it unusable. The damage to the environment can be considerable in this case. It is known drinking water protection areas! in Straben- und Tiefbau 2/90) to demand permanent and monitored tightness of such pipelines. It is also known from these literature sources to make use, for the purpose of meeting such demands, of single walled pipes which satisfy the requirements of the pressure pipe range. This means that the pipe is subjected to a test pressure of 2.4 bar and an operating pressure of 1.6 bar. The carrying capacity of the pipe is likewise designed to be higher than actually required. Consequently, particularly thick pipes are used. Before commissioning, during operation, before expiry of the warranty and every five years after, the pipes provided for use in drinking water protection areas are to be tested for their tightness. The testing is performed optically, for example after excavating the earth in a prescribed section. In the case of a leak in a pipeline, the defective point is likewise determined by excavation of the earth along the line. It is known, furthermore, to use double-walled pipes, in order for it to be able to catch leaks arising in the inner pipe by the pipe arranged around the latter.
It is mostly pipes made from stoneware which are used, since these deliver particularly good results even in the case of short-term or long-term, sometimes extreme chemical, physical, frequently thermal, or biological loads. Stoneware is flexurally stiff, dimensionally stable and resistant to corrosion, and, apart from hydrofluoric acid, is not attacked by any substance contained in the sewage, groundwater or earth.
In addition, concrete, which has somewhat different performance characteristics, is frequently used as the material. Even today, shafts are still, in part, built in brick or stone and/or produced from concrete.
Only the generally valid term of "pipeline" is to be used below.
It is the object of the invention to provide an improved method for monitoring the tightness of pipelines, in particular sewer line systems, and a device for carrying out the method.
This object is achieved by means of the invention described herein. The result is to permit continuous monitoring, at any time, of the tightness of the pipelines, without having to undertake excavations of the earth. It is also possible to use single-walled pipes which do not satisfy the requirements of the pressure tube range. The data of the individual measuring and monitoring stations, which are arranged distributed over the pipeline system, can be interrogated in one monitoring station.
In principle, a method for monitoring the tightness of pipelines, in particular sewer line systems, is provided, in which one or more monitoring channels or tubular openings are arranged in the wall of the pipeline along its longitudinal extent. The mutually facing ends of neighbouring pipelines are joined to one another such that the mutually facing ends of the monitoring channels or tubular openings are tightly joined. The mutually joined monitoring channels or tubular openings joined to one another form, for the entire pipeline system, a closed pressure chamber which also includes the sealing regions. The monitoring channels or tubular openings are filled with a test medium under static pressure. This can be a gas, on the one hand, or a liquid, on the other hand. The monitoring channels or tubular openings are assigned means for measuring the pressure. Finally, a leak in the region of a sleeve or of the wall of the pipeline is
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Politzer Jay L.
Williams Hezron E.
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