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Bearing Temperature Measurement With a Contact Thermometer

Bearing Temperature Measurement With a Contact Thermometer
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  Bearing temperature measurement with a contact thermometer  Condition monitoring has proven important in the installation and maintenance of all types of turbomachinery throughout the past 30 to 40 years. Babbitt bearing temperature is primarily important because bearings are the critical links between the rotating and stationary components in a machine. If temperatures are taken in the correct location with respect to the direction of bearing load, to direction of shaft rotation and to the distance of the tip of the sensor from the bearing running surface, then Babbitt metal temperatures can be the best indicators of a bearing's operating condition. Using an infra-red camera with a two-man team to check all equipment, connections and branches on electrical equipment from 400V to 400V  While infrared imaging systems are relatively simple to use, interpreting images taken with this equipment can be far more complex and challenging. With training and experience, however, remarkable information can be extracted from an infrared camera that can help asset managers and maintenance personnel alike better maintain systems and equipment while monitoring or improving the quality of products. When it comes to inspecting mechanical equipment with infrared, certain conditions are needed. It is also important for the thermographer to have a strong foundation of basic radiometry and heat transfer, knowledge of how the mechanical equipment operates, as well as a solid background on the infrared camera’s capabilities and limitations. As with any type of technology, proper training is essential to successfully operate these systems. Checking insulation condition with an infra-red thermometer   Portable infrared thermometers provide close estimations of pressures on valves, traps, and coil heaters. These devices are also useful for spotting conditions such as heat loss, the need for insulation, overheating, overloads, and cooling failures. Thus, an infrared thermometer be used along with ultrasound. Measuring the temperature of rotating rollers Apparatus for measuring the temperature of a rotating roller mounted on a frame including a temperature sensor mounted on and electrically insulated from the frame and having a tip extending within a groove in the roller without contacting the roller to provide electrical signals corresponding to the temperature of the roller, and a grounded detecting device receiving the electrical signals from the temperature sensor and having an alarm circuit therein providing alarm signals when the temperature of the roller is below or above low and high limits, respectively. If the temperature sensor contacts the roller, a current will be produced between the frame and the detecting device ground to develop a signal overlapping the electrical signals and representing a sufficient increase or decrease in temperature of the roller received by the alarm circuit to provide an alarm signal.  Thickness measurement using an ultrasonic measurement instrument   Coating thickness is an important variable that plays a role in product quality, process control, and cost control. Measurement of film thickness can be done with many different instruments. Understanding the equipment that is available for film thickness measurement and how to use it is useful to every coating operation. The issues that determine what method is best for a given coating measurement include the type of coating, the substrate material, the thickness range of the coating, the size and shape of the part, and the cost of the equipment. Commonly used measuring techniques for cured organic films include nondestructive dry film methods such as magnetic, eddy current, ultrasonic, or micrometer measurement and also destructive dry film methods such as cross-sectioning or gravimetric (mass) measurement. Methods are also available for powder and liquid coatings to measure the film before it is cured. Leak tracing with an ultrasonic detector Ultrasonic leak detection acts as a complement to traditional gas detection methods, however, unlike traditional leak detection methods, ultrasonic leak detection can detect the gas before it reaches the sensor. Ultrasonic technology demonstrates significant benefits over infra-red or traditional point gas leak detection technologies as the sensor itself is unaffected by wind direction, dilution of the gas cloud or the direction of the leak itself, therefore it has the potential to provide early warning of a hydrocarbon release Shock-pulse measurement of a rolling bearing SPM is an abbreviation for the Shock Pulse Method, which is a patented technique for using signals from rotating rolling bearings as the basis for efficient condition monitoring of machines. From the innovation of the method in 1969 it has now been further developed and broadened and is now a worldwide accepted philosophy for condition monitoring of rolling bearings and machine maintenance. Continuous bearing monitoring by the SPM method   Due to the sensitivity of the Shock Pulse Method, bearing lubrication condition is measurable through the signal monitored as dBc. The dBc is measured in the time wave signal of the shock pulse transducer. The filtered transducer signal reflects the pressure variation in the rolling interface of the bearing. When the oil film in the bearing is thick, the shock pulse level is low, without distinctive peaks. The level increases when the oil film is reduced, but there are still no distinctive peaks. Damage causes strong pulses at irregular intervals.   Inspection of a rotating machine element with a stroboscope lamp Visual inspection of rotating assets in conjunction with using a strobe light allows other components to be evaluated. Coupling, shaft and key condition; Leak detection from bearing caps; mechanical seals and couplings; Mechanical looseness of machine components; Belt condition, Even tensioning / loading of belt drive systems. Crack detection using penetrating dye Dye penetrant inspection (DPI), also called liquid penetrant inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to locate surface-breaking defects in all non-porous materials (metals, plastics, or ceramics). The penetrant may be applied to all non-ferrous materials and ferrous materials, although for ferrous components magnetic-particle inspection is often used instead for its subsurface detection capability. LPI is used to detect casting, forging and welding surface defects such as hairline cracks, surface porosity, leaks in new products, and fatigue cracks on in- service components. The main advantages of DPI are the speed of the test and the low cost. Disadvantages include the detection of only surface flaws, skin irritation, and the inspection should be on a smooth clean surface where excessive penetrant can be removed prior to being developed. Conducting the test on rough surfaces, such-as as-welded welds, will make it difficult to remove any excessive penetrant and could result in false indications. Water-washable penetrant should be considered here if no other option is available. Also, on certain surfaces a great enough color contrast cannot be achieved or the dye will stain the workpiece. Limited training is required for the operator —  although experience is quite valuable. Proper cleaning is necessary to assure that surface contaminants have been removed and any defects present are clean and dry. Some cleaning methods have been shown to be detrimental to test sensitivity, so acid etching to remove metal smearing and re-open the defect may be necessary. Magnetic powder method of crack detection Magnetic particle inspection (MPI) is a non-destructive testing (NDT) process for detecting surface and slightly subsurface discontinuities in ferroelectric materials such as iron, nickel, cobalt, and some of their alloys. The process puts a magnetic field into the part. The piece can be magnetized by direct or indirect magnetization. Direct magnetization occurs when the electric current is passed through the test object and a magnetic field is formed in the material. Indirect magnetization occurs when no electric current is passed through the test object, but a magnetic field is applied from an outside source. The magnetic lines of force are perpendicular to the direction of the electric current which may be either alternating current (AC) or some form of  direct current (DC) (rectified AC).   
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