The device for monitoring internal pipe deposit accumulation is a capacitance-based sensor for monitoring changes in thickness of deposits accumulating on an internal surface of a pipe. The device includes a pipe segment having opposed first and second open ends with at least one valve releasably sealing at least one of the first and second open ends. A first electrode, in the form of an electrically conductive cylindrical shell, is mounted on and surrounds a portion of an external surface of the pipe segment. A second electrode, in the form of an electrically conductive rod, is mounted coaxially within an interior of the pipe segment. An electrical power source is electrically connected across the first and second electrodes to form a cylindrical capacitor and changes in capacitance of the cylindrical capacitor are monitored by a controller.

An evaluation method for corrosion damage evolution of underwater concrete structures includes performing the time reversal test on the concrete beam specimen placed in the water, performing the uniaxial compression test on the concrete cube specimens; immersing the concrete beam specimen and the concrete cube specimens in a hydrochloric acid solution, and performing the time reversal test on the concrete beam specimen on the 10th, 20th and 30th days respectively. At the same time, a concrete cube specimen is taken out to perform the uniaxial compression test on the 10th, 20th and 30th days respectively; and using the above calculation results to evaluate the corrosion evolution process thereof without damaging the underwater concrete structure.

A device (100) for detecting settled solids (300) in a conduit (200) for transporting slurry. The device (100) comprises a housing (110) positionable to define at least a segment of a flow path for the slurry. The device (100) comprises a reference temperature sensor (140) associated with the inside of the housing 110 in order to measure an ambient temperature of the slurry within the conduit. The device (100) further comprises a plurality of heaters (150) spaced around part of the inside circumference housing (110) that are maintained at a target temperature that is higher titan the ambient temperature of the slurry.

Fluid flow systems can include one or more resistance temperature detectors (RTDs) in contact with the fluid flowing through the system. One or more RTDs can be operated in a heating mode and a measurement mode. Thermal behavior of the one or more RTDs can be analyzed to characterize a level of deposit formed on the RTD(s) from the fluid flowing through the system. Characterizations of deposition on RTDs operated at different temperatures can be used to establish a temperature-dependent deposition profile. The deposition profile can be used to determine if depositions are likely to form at certain locations in the fluid flow system, such as at a use device. Detected deposit conditions can initiate one or more corrective actions that can be taken to prevent or minimize deposit formation before deposits negatively impact operation of the fluid flow system.

In various examples, a fluid ejection device may include a substrate with a fluid feed hole and a corrosion-detecting conductive path or sensor disposed behind a wall of the fluid feed hold. The corrosion-detecting conductive path or sensor may close a circuit in response being exposed to a fluid contained within the fluid feed hole.

A sensor for detecting material deposits in a fluid flow conduit includes a body and an array of pairs of temperature sensors disposed within the body, where each pair of temperature sensors is spaced a distance apart along a primary flow direction of the fluid flow conduit.

A method of detecting accumulation of material deposits within a fluid flow conduit includes providing, by a controller, an excitation signal to a heating element of the fluid flow conduit. The method includes obtaining, by the controller, thermodynamic data of the fluid flow conduit in response to providing the excitation signal, where the thermodynamic data includes heat flux data, diffusivity data, time data, temperature differential data, or a combination thereof. The method includes determining, by the controller, an amount of material deposits based on the thermodynamic data.

The invention relates to a method for evaluation of fouling of passages of a spacer plate (10) of a tubular heat exchanger (11), wherein first, second and third pressure sensors (31, 32, 33) are arranged, the method comprising steps of: (a) during a transient operation phase of the heat exchanger determination of a value over time of Wide Range Level NGL, from the measurements of the first and third pressure sensors (31, 33), and of a value over time of Narrow Range Level NGE, from the measurements of the second and third pressure sensors (31, 33); (b) determination of a value over time of Steam Range Level deviation ΔNGV, corresponding to the NGL from which a component representative of a variation of free water surface in the heat exchanger has been filtered, from the values of NGL and NGE; (c) comparison of the determined value of ΔNGV with a set of reference profiles ΔNGV.sub.i for said transient operation phase of the heat exchanger, each reference profile ΔNGV.sub.i being associated with a level of fouling so as to identify a target reference profile ΔNGV.sub.opt among the reference profiles ΔNGV.sub.i for said transient operation phase of the heat exchanger, which is that closest to the determined value ΔNGV. (d) restored on an interface (3) of the level of fouling associated with the identified target reference profile ΔNGV.sub.opt.

A system and method for monitoring or detecting a level of biofilm growth in a fluid system and controlling operating parameters of the fluid system based a measured level of growth. The monitoring system and method comprises a dye injection system for periodically injecting dye into a portion of fluid from the fluid system, passing the portion of fluid though a narrow lumen tube to achieve laminar flow and using a light source and optical sensor to detect a transmission or emission indicating a level of biofilm growth in the tube corresponding to a level of growth on components in the fluid system. Information based upon the measurements or calculations made by the monitoring system may be used to manually or automatically alter various operating parameters to control the fluid system and aid in maintaining stable operation of the fluid system within preferred specifications.

A method for the detection and monitoring of surface fouling from the nanoscale as a predictive or real-time monitoring tool is provided. Also provided are devices for carrying out the method, and to uses of the method, in particular for optimising cleaning procedures of devices or components thereof fouled by flows of foulant.