Leak location
First Claim
1. Ground-motion detection apparatus comprising a multiplicity of discrete ground-motion sensors each in use contactable with the ground, together with a body of a damping material to hold each sensor in ground contact and thereby avoid significant mounting resonance effects between the sensor and the ground.
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Accused Products
Abstract
When an underground pipe carrying a fluid, such as a buried water-pipe, develops a leak the leak must first be located before it can be repaired. One common location method makes use of the fact that the leaking fluid often creates a noise, typically a hissing sound, which is transmitted through the ground, and although rapidly attenuated can be heard with suitable highly sensitive ground microphones and is therefore useful to field crews as a means of locating leaks. Unfortunately, the sound levels can be grossly distorted by underground heterogenities, and can easily be confused or even swamped by other sound sources above ground, and in general ground microphones used like this do not seem to be effective. The invention deals with the problems entailed in this technique by a method—and apparatus —which involves using semi-automated equipment to listen (either simultaneously or sequentially) to the leak sound source (1) from a multiplicity of different positions (as 3) spaced all around the sound source, and by then suitably combining and processing the received signals to provide the desired indication of the source'"'"'s location.
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Citations
30 Claims
- 1. Ground-motion detection apparatus comprising a multiplicity of discrete ground-motion sensors each in use contactable with the ground, together with a body of a damping material to hold each sensor in ground contact and thereby avoid significant mounting resonance effects between the sensor and the ground.
- 17. A method of determining the location of a leak in an underground pipe carrying a fluid, in which method the movement of the ground caused by the fluid as it leaks from the pipe is listened to using ground-motion detection apparatus, and by suitably combining and operating upon the signal information received at each sensor there is determined the actual location of the leak, said ground-motion detection apparatus comprising a multiplicity of discrete ground-motion sensors each in use contactable with the ground, together with a body of a damping material to hold each sensor in ground contact and thereby avoid significant mounting resonance effects between the sensor and the ground.
Specification