Methods, systems, and apparatus for periodic water leak detection are disclosed. A method includes obtaining, using a water meter, water meter data representing the occurrence of water usage events at a property; determining, based on the water meter data, a periodicity of water usage events; determining that the periodicity of water usage events satisfies water leak criteria; and based on determining that the periodicity of water usage events satisfies water leak criteria, determining that a water leak exists at the property. Determining the periodicity of water usage events can include determining an average time between a start of sequential water usage events; and determining that the periodicity of water usage events satisfies water leak criteria can include determining that the average time between the start of sequential water usage events is less than a threshold time between the start of sequential water usage events.

Aspects and techniques of the present disclosure relate to a process of evaluating a pressurized fluid system including an automatic bleed valve arrangement therein for undesirable air leakage by diagnostically operating the automatic bleed valve arrangement. The disclosure also relates to methods of evaluating air presence in a pressurized fluid system sufficient to warrant bleed valve operation. Further, apparatus and features thereof are characterized.

A system is provided for differentiating between water usage of multiple water consumers using a common distributed water infrastructure. The system receives from a water sensor that is upstream of a plurality of appliances, signals indicative of water usage, and constructs from the signals a plurality of water event profile signatures. The system associates, based on differences between similar water event profiles, at least one water event profile signature with a first water consumer and associates a second water event profile signature with a second water consumer, and stores the water event profile signatures for the first water consumer and the second water consumer. The system constructs current water event profiles reflecting subsequent water usage in the distributed water infrastructure, and attributes a first current water event profile to the first water consumer and attributes a second current water event profile to the second water consumer.

Compliant leak detection system. The system includes structure adapted to support at least two rows of leak detection leaves, each leak detection leaf supported by an arm pivotally attached to the structure and urged outwardly by a torsion spring into contact with a pipe wall so as to adjust for changes in pipe diameter. The leak detection leaf includes a rigid support and a flexible member such that suction from a leak will cause the flexible member to contact the pipe wall and put a drag force on the structure. An axial force transmitting drum measures the drag force to indicate presence of a leak.

An infrastructure and methods for the analysis of flow in pipe systems. In a preferred form, the infrastructure and methods account for energy status of a sensor device and wear cost functions. The infrastructure comprises a controller and a plurality of sensor devices coupled to the pipe system to collect measurements related to one or more of the following: vibration, magnetic field, fluid pressure, temperature, humidity, chemical composition of the fluid, fluid flow or fluid throughput. The controller has access to a database containing one or both of—(i) current energy status of a sensor device and/or (ii) a cost allocation relating to use of a sensor device and assigns workloads using energy status and/or cost.

A method of inspecting a leak detection system in a short time is disclosed. The leak detection system includes a leak detection line, an on-off valve, a flow mater, an operation controller configured to detect a fluid leak from a fluid line based on a first flow rate measured by the flow mater, a drain line, and a drain valve attached to the drain line. The inspection method includes: opening the on-off valve and the drain valve, with a supply valve and a return valve closed; measuring a second flow rate of fluid in the leak detection line by the flow mater; and determining that the leak detection system has a defect when the second flow rate is lower than a predetermined reference value.

A conduit inspection method includes a first specifying step (S1) of specifying, as a normal section of a conduit, a section from a first end (Pa) of the conduit that is connected to one manhole to a first position (P1) in the conduit at which airtightness can be confirmed, a second specifying step (S1) of specifying, as a normal section of the conduit, a section from a second end (Pb) of the conduit that is connected to another manhole to a second position (P2) in the conduit at which airtightness can be confirmed, and a third specifying step (S3) of specifying a section from the first position (P1) to the second position (P2) as an abnormal section of the conduit.

The subject matter disclosed herein relates to fluid leakage detection. More particularly, subject matter relates to a device for detecting fluid leakage in a fluid drain pipe attached to a power transformer device. The device comprises fluid collection compartment attached to bottom of the fluid drain pipe and a fluid level switch is positioned in the fluid collection compartment to generate alarm signal to indicate fluid leakage.

Systems and methods are provided for optimally determining sensor or infrastructure placement in a fluid network, for determining an anomaly of interest in the fluid network, and for determining sensor coverage in a fluid network, which are based on a model of the fluid network represented by a directed graph.

Disclosed is a fluid leak and microleak detector that incorporates three aligned elements: the first element being a solenoid valve (4) that is aligned to the direction of flow, which is followed by a flowmeter (5) and finally a pressure switch (6). These items are managed and connected to an electronic board (7) which contains a computer application with two complementary routines; a routine that detects microleaks (13) for fluid losses greater than 0.15 l/h which is linked to the pressure switch (6) and the solenoid valve (4), and another routine that detects leaks (12) for fluid losses of around 3 l/h and greater, which is linked to the flowmeter (5) and the solenoid valve.