Pipe network, with a hierarchical structure, for supplying water or gas and/or for removing industrial water, process for detecting a leak in such a pipe network and process for determining, with the aid of a computer, the operating life theoretically remaining for a renewable power source for at least one flowmeter in such a pipe network

• US 20090007968A1
• Filed: 12/19/2005
• Published: 01/08/2009
• Est. Priority Date: 12/23/2004
• Status: Abandoned Application

• Current Assignee: Endress + Hauser Incorporated
• Original Assignee: Endress + Hauser Incorporated
• Inventors: Knecht, Christian, Hantzer, Fabien, Endress, Urs, Tracogna, Jean-Franco
• Application Number:
  US11/794,054
• Publication Number:
  US 20090007968A1
• Time in Patent Office: Days
• US Class Current: 137/15.110
• CPC Class Codes: F17D 5/02 Preventing, monitoring, or locating loss
• CPC Class Codes: G01M 3/2807 for pipes G01M3/2892, G01M3/30 take precedence
• CPC Class Codes: Y10T 137/0452 Detecting or repairing leak
• CPC Class Codes: Y10T 137/8326 Fluid pressure responsive indicator, recorder or alarm

Abstract

Summary: The invention concerns a pipe network (10), with a hierarchical structure, for supplying water or gas and/or removing industrial water where the flowmeters (54-82) provided in the individual pipes are standalone units that are connected to a master flowmeter (52) in a master-slave network. The flowmeters (54-82) have their own, autarkic power supply system. By totaling the measured flow values in the lower-order pipes in the hierarchy and comparing the result with a measured flow value in the related pipe on the next highest level, a leak can be detected in one of the lower-order pipes.

In addition, the invention also concerns a process for detecting a leak in such a pipe network (10) and a process for determining—with the aid of a computer—the operating life theoretically remaining for a renewable power source for at least one flowmeter in such a pipe network.

Claims

1-40. -40. (canceled)

41. A pipe network for supplying water or gas and/or removing industrial water, comprising:

a hierarchical structure made up of pipe branches of individual legs with several pipe branches each fitted with at least one flowmeter, wherein;

said flowmeters are standalone units;

said flowmeters are connected to a master-slave network; and

said flowmeters communicate wirelessly with one another.

42. The pipe network as per claim 41 wherein:

said pipe branch is provided with a higher-order pipe branch and a lower-order pipe branch; and

at least one flowmeter is provided in said higher-order pipe branch to act as a master flowmeter and several other flowmeters are provided in said lower-order pipe branch acting as slave flowmeters.

43. The pipe network as per claim 42, wherein:

said slave flowmeter reports a measured value it determines to said master flowmeter.

44. The pipe network as per claim 42, wherein:

said slave flowmeters report the measured values they determine in their own particular pipe branch to said master flowmeter.

45. The pipe network as per claim 44, wherein:

said slave flowmeters detect a flow direction prevalent in their particular pipe branch and report this to said master flowmeter.

46. The pipe network as per claim 45, wherein:

said master flowmeter calculates the sum of the individual measured values transmitted to it by said slave flowmeters.

47. The pipe network as per claim 46, further comprising:

a central station, wherein;

said master flowmeter communicates with said central station.

48. The pipe network as per claim 47, wherein:

said master flowmeter sends an error or alarm signal, indicating a leak, to said central station if the total of the individual measured values from said slave flowmeters deviates beyond a specific tolerance from a measured value measured by said master flowmeter itself.

49. The pipe network as per claim 41, further comprising:

a power source connected to said flowmeters, wherein;

power is supplied to said slave flowmeters at least by said power source.

50. The pipe network as per claim 49, wherein:

every slave flowmeter is assigned an individual power source.

51. The pipe network as per claim 49, wherein:

each flowmeter determines the remaining operating life of its said power source at specified times.

52. The pipe network as per claim 51, wherein:

each flowmeter determines the remaining operating life of its said power source on request.

53. The pipe network as per claim 51, wherein:

said master flowmeter communicates the remaining operating lives of said power source, determined by said slave pressure measuring instruments, to said central station.

54. The pipe network as per claim 44, characterized in that the power source is a battery.

55. The pipe network as per claim 49, in that the energy storage unit is a fuel cell.

56. The pipe network as per claim 41, wherein:

at least one of said flowmeters is a flowmeter suitable for custody transfer measurement.

57. The pipe network as per claim 41, wherein:

at least one of said flowmeters can be calibrated at its installation point.

58. The pipe network as per claim 41, wherein:

at least one of said flowmeters is an ultrasonic flowmeter.

59. The pipe network as per claim 41, wherein:

at least one of said flowmeters is an electromagnetic flowmeter.

60. The pipe network as per claim 59, wherein:

at least one of said flowmeters combines an electromagnetic measuring arrangement and a flow measuring arrangement that works with ultrasonic signals in one common housing.

61. The pipe network as per claim 41, wherein:

at least one of said flowmeters is fitted with a temperature sensor.

62. The pipe network as per claim 41, wherein:

at least one of said flowmeters is fitted with a pressure sensor.

63. The pipe network as per claim 41, wherein:

at least one sealable bypass is provided between two pipe branches.

64. The pipe network as per claim 41, wherein:

said slave flowmeters are organized on different hierarchical levels in the master-slave network, which structure is decisive for the communication of said slave flowmeters with said master flowmeter.

65. A process for detecting a leak in a pipe network for supplying water or gas and/or removing industrial water, where the pipe network includes a hierarchical structure made up of pipe branches of individual legs and several pipe branches are fitted with at least one flowmeter and where the flowmeters are standalone units, are connected to a master-slave network and communicate with one another using wireless technology, the process comprises the following steps:

reporting measured values using slave flowmeters in lower-order pipe branches, and record to the master flowmeter which is arranged in a higher-order pipe branch;

calculating a total from the measured values using the master flowmeter of the slave flowmeters of the hierarchical levels in question;

comparing this total to a value measured for the next highest hierarchical level; and

generating an alarm signal by the master flowmeter if the total of the lower-order hierarchical level deviates from the measured value measured in the next highest hierarchical level and is outside a prespecified tolerance value, which indicates that the values do not tally and requests the pipe branch or branches be inspected.

66. The process as per claim 65, further comprising the step of:

using at least two ultrasonic flowmeters to inspect a single lower-order pipe branch for a possible leak in the pipe branch affected, including lower-order pipe branches, where the time-of-flight values of the sonic signals from one ultrasonic flowmeter to another are determined and examined with regard to the sonic velocities which deviate from sonic velocities for the pipe branch, which were known or determined beforehand, taking into account a known distance between the ultrasonic flowmeters.

67. The process as per claim 65, comprising the step of:

checking the function of the slave flowmeters in the pipe branches in question using the master flowmeter before actually emitting the alarm signal, by causing the flowmeters to initialize control measurements and test sequences.

68. The process as per claim 65, further comprising the step of:

individually examining the pipe branch in question for leaks by comparing the measured values, which caused the alarm signal to be triggered, against a reference curve created for the same pipe branch from earlier measurements.

69. The process as per claim 65, further comprising the step of:

checking the function of the slave flowmeters using the master flowmeter at specified times or at specified intervals by causing the flowmeters in question to initialize function control measurements and test sequences.

70. A process for determining, with the aid of a computer, the operating life theoretically remaining for a renewable power source for at least one flowmeter in a pipe network for supplying water or gas and/or removing industrial water, comprising:

a hierarchical structure made up of pipe branches of individual legs with several pipe branches each fitted with at least one flowmeter, wherein;

said flowmeters are standalone units;

said flowmeters are connected to a master-slave network; and

said flowmeters communicate wirelessly with one another, comprising the following steps;

determining a matrix of influencing factors which affect the theoretical operating life of the power source;

determining a theoretical operating life with a variation of different influencing factors or a combination thereof;

recording all the influencing factors from the point when the power source is installed to when it fails or terminates;

recording at least the influencing factors at specified times as a function of an operating time, which has elapsed by then, of the flowmeter in question;

determining the operating life theoretically remaining with the aid of a matrix taking into account all the influencing factors recorded to date and the operating time that has elapsed; and

performing all the process steps previously mentioned on a computer connected to the flowmeter or flowmeters.

71. The process as per claim 70, further comprising the step of:

determining the operating life of the power source theoretically remaining each time the measuring cycles of the flowmeter are changed.

72. The process as per claim 70, wherein:

the operating life theoretically remaining for the power source is determined periodically if the value has not been determined in the meantime as the measuring cycles had not changed.

73. The process as per claim 70, which is used to determine the operating life theoretically remaining, comprising the further steps of:

determining, using the various operating lives theoretically remaining for various value pairs of influencing factors;

displaying the various operating lives theoretically remaining to the user on a display unit together with the various influencing factor value pairs, whereby the user is allowed change the values of the value pairs or the influencing factors on a data input unit of the computer; and

calculating, using the computer, a new operating life theoretically remaining based on the modified values and displays this on the computer display unit, when the user enters or changes the value pairs of influencing factors.

74. The process as per claim 73, wherein:

for a value pair of influencing factors that the user ultimately selects, the computer uses the influencing factors which affect a required measuring cycle of the flowmeter or flowmeters to configure the flowmeter(s).

75. The process as per claim 74, wherein:

the operating life theoretically remaining for a renewable power source of one particular flowmeter or several flowmeters is determined periodically, such that the operating life theoretically remaining for the flowmeter(s) with the existing configuration is shown to the user who then has the option of changing the configuration and the new operating life theoretically remaining, as a result of the modified configuration, is then indicated.

76. The process as per claim 70, wherein:

in that in the case of a battery or a unit consisting of several batteries that act as the power source for the flowmeter(s), a voltage drop measured in the power source per time is taken into account as an influencing factor when determining the current operating time theoretically remaining for the power source.

77. The process as per claim 76, further comprising the step of:

comparing the current measured voltage drop per time unit to a theoretical value calculated for the particular configuration of the flowmeter(s) and in that an alarm is generated if a specified deviation threshold is exceeded.

78. The process as per claim 76, wherein:

a trend is determined from several voltage drops currently measured per time unit and in that this trend is compared to a theoretical value calculated for the particular configuration of the flowmeter(s) and in that an alarm is generated if a specified deviation threshold is exceeded.

79. The process as per claim 77, further comprising the step of:

generating a signal when a predefined operating life theoretically remaining is undershot and in that this signal indicates that the power source has to be replaced.