The metal tank portion of an electric water heater is protected against corrosion utilizing a corrosion protection system that detects a voltage potential between the sheath portion of a tank water-immersed electric heating element and the tank. In one embodiment of the corrosion protection system the sensed sheath/tank potential is utilized to enable a user of the water heater to accurately gauge the necessity of replacing a sacrificial anode extending into the tank. In another corrosion protection system, the sensed sheath/tank potential is utilized to provide impressed current cathodic protection of the tank and also to prevent dry firing of the electric water heater.

The metal tank portion of an electric water heater is protected against corrosion utilizing a corrosion protection system that detects a voltage potential between the sheath portion of a tank water-immersed electric heating element and the tank. In one embodiment of the corrosion protection system the sensed sheath/tank potential is utilized to enable a user of the water heater to accurately gauge the necessity of replacing a sacrificial anode extending into the tank. In another corrosion protection system, the sensed sheath/tank potential is utilized to provide impressed current cathodic protection of the tank and also to prevent dry firing of the electric water heater.

There is a demand for low-cost robust method to detect corrosion for estimating corrosion inhibitor (CI) concentration sensing. This disclosure herein relates to method and system for estimating corrosion inhibitor (CI) concentration using a multi-electrode array sensor. The method initially obtains a plurality of electrochemical signals using the multi-electrode array sensor from the corroding environment. Further, the plurality of electrochemical signals are analyzed to obtain a plurality of parameters. Further, the method analyses a plurality of features from the plurality of parameters for estimating the corrosion inhibitor (CI) concentration using a trained machine learning model. The method is capable of estimating the corrosion inhibitor concentration of any unknown liquid using the regression model and the classification model.

There is a demand for low-cost robust method to detect corrosion for estimating corrosion inhibitor (CI) concentration sensing. This disclosure herein relates to method and system for estimating corrosion inhibitor (CI) concentration using a multi-electrode array sensor. The method initially obtains a plurality of electrochemical signals using the multi-electrode array sensor from the corroding environment. Further, the plurality of electrochemical signals are analyzed to obtain a plurality of parameters. Further, the method analyses a plurality of features from the plurality of parameters for estimating the corrosion inhibitor (CI) concentration using a trained machine learning model. The method is capable of estimating the corrosion inhibitor concentration of any unknown liquid using the regression model and the classification model.

A storage tank apparatus and a method for determining a bottom plate health for the apparatus is disclosed. A storage tank apparatus includes a tank foundation having a bottom plate support surface and at least one foundation tube housed inside at least one foundation channel, a bottom plate, a tank shell, at least one shell tube, at least one foundation inspection window, at least one shell inspection window and testing equipment that is operatively connected to the foundation tube and shell tube. A method for determining a bottom plate health for a storage tank apparatus includes operatively connecting the testing equipment to the foundation tube and shell tube, measuring a first and a second level of corrosion respectively, accessing the testing equipment by a computer processor, storing the first and second level of corrosion and determining the bottom plate health while the storage tank apparatus is in service.

A storage tank apparatus and a method for determining a bottom plate health for the apparatus is disclosed. A storage tank apparatus includes a tank foundation having a bottom plate support surface and at least one foundation tube housed inside at least one foundation channel, a bottom plate, a tank shell, at least one shell tube, at least one foundation inspection window, at least one shell inspection window and testing equipment that is operatively connected to the foundation tube and shell tube. A method for determining a bottom plate health for a storage tank apparatus includes operatively connecting the testing equipment to the foundation tube and shell tube, measuring a first and a second level of corrosion respectively, accessing the testing equipment by a computer processor, storing the first and second level of corrosion and determining the bottom plate health while the storage tank apparatus is in service.

An electric field gradient sensor is presented, having a sensor body having an outer surface; and a plurality of electrodes distributed over the outer surface, each electrode having an electrode surface facing outward from the surface. The plurality of electrodes are arranged forming a plurality of electrode pairs, each electrode pair formed by a first electrode and a second electrode located on opposite sides of the sensor body. This sensor enables three-dimensional measurements of the electric field gradient along structures located in an electrically conductive medium, such as subsea structures, for example for monitoring the cathodic protection of such structure.

An electric field gradient sensor is presented, having a sensor body having an outer surface; and a plurality of electrodes distributed over the outer surface, each electrode having an electrode surface facing outward from the surface. The plurality of electrodes are arranged forming a plurality of electrode pairs, each electrode pair formed by a first electrode and a second electrode located on opposite sides of the sensor body. This sensor enables three-dimensional measurements of the electric field gradient along structures located in an electrically conductive medium, such as subsea structures, for example for monitoring the cathodic protection of such structure.

A sulfidation detection sensor includes a rectangular parallelepiped insulating substrate, a resistor formed to adhere closely to a surface of the insulating substrate, a sulfidation detection conductor formed to adhere closely to a surface of the resistor, a protective layer that is impermeable to sulfide gas and formed to cover a portion of the sulfidation detection conductor, and a pair of electrode portions formed at both ends of the insulating substrate and connected to the resistor and the sulfidation detection conductor. The sulfidation detection conductor is made of metal having a resistance value less than that of the resistor, and includes an exposed portion exposed to the outside without being covered with the protective layer.

A sulfidation detection sensor includes a rectangular parallelepiped insulating substrate, a resistor formed to adhere closely to a surface of the insulating substrate, a sulfidation detection conductor formed to adhere closely to a surface of the resistor, a protective layer that is impermeable to sulfide gas and formed to cover a portion of the sulfidation detection conductor, and a pair of electrode portions formed at both ends of the insulating substrate and connected to the resistor and the sulfidation detection conductor. The sulfidation detection conductor is made of metal having a resistance value less than that of the resistor, and includes an exposed portion exposed to the outside without being covered with the protective layer.