Superheater tubes are the most critical components of a power plant''s boiler. Due to operation in high-temperature and -pressure conditions, platen superheater (primary superheater) tubes in thermal power point boilers are exposed to breakdowns such as creep failure and overheating. Therefore, identifying the causes of these failures and its maintenance …
Superheater tubes are the most critical components of a power plant''s boiler. Due to operation in high-temperature and -pressure conditions, platen superheater (primary superheater) tubes in thermal power point boilers are exposed to breakdowns such as creep failure and overheating. Therefore, identifying the causes of these failures and its maintenance …
This paper investigates the root cause analysis of a failure in brass tubes in a power plant condenser unit. Condenser tubes in power plants are plugged in when a leakage is detected and spotted on-site. Plugging means fewer available tubes in a condenser, which clearly has negative implications for the efficiency of the heat transfer between the cooling water and …
Stress rupture can also be experienced in water cooled tubing if abnormal heat transfer conditions exists that results in an increase in the tubes operating temperature [4, 5]. If the thickness of the tube decreases by corrosion, or erosion, the hoop stress will …
Micro-tubes have small diameters and thin wall thicknesses. When using double-layer gas-assisted extrusion (DGAE) technology to process micro-tubes, due to the influence of flow resistance ...
Evacuated tube solar hot water collectors comprise a series of cylindrical tubes, each containing a vacuum-sealed space. The vacuum-sealed space acts as insulation, which helps to keep the heat inside the tube. The outer layer of the tube is made of high-quality glass, which allows sunlight to pass through but does not allow heat to escape.
One of the biggest challenges in condenser tubes is the gradual deposition of precipitates at the inner surface of tubes. The formation of a layer inside tubes decreases the …
A significant amount of oxide layer was observed in the inner side of the failed tube. In the other tube the inner oxide layer was very small and the tube was thinned down due to fireside corrosion.
One of the main reasons for the shutdown and removal of boilers from the circuit, and consequently, the removal of the unit from the network is the leakage occurrence as a result of the failure in boilers'' tubes, particularly in superheater tubes as well as re-heater ones [7].The reasons for the damage generally include a set of factors with regard to corrosion as well as …
A perforated bowel, or ruptured colon, occurs when a hole is made in the innermost layer of the lining of the colon, the last place stool passes through before reaching the anus.A ruptured colon can happen due to an injury or illness, such as inflammatory bowel disease (IBD), that harms your digestive tract.
88 composite tubes since they could be used to take advantage of the properties of its constituent materials. These 89 kinds of tubes are used in the petrochemical industry, where high corrosion resistance alloys are placed in the 90 inner layer and a conventional alloy is located in the outer one [25]. Flores and Almanza [26] experimentally
There are basically two types of collectors, stationary and tracking [3] (Fig. 1).Different collector configurations can help to obtain a large range of temperature for example, 20–80 °C is the operating temperature range of a flat plate collector (FPC) [4] and 50–200 °C is for an evacuated tube solar collector (ETSC) [5], [6].The most productive and mostly used …
This paper investigates the failure of superheater tubes, made of AISI 304 stainless steel, after 10 years of service in a power plant. The failure is in the form of fish mouth rupture and is mostly observed at U-bent elbows. Microstructure of the degraded samples was analyzed using optical and scanning electron microscopes. Phases were identified with energy …
This is also called an effort rupture, or Boerhaave''s syndrome. It usually happens during forceful and repeated vomiting. What is the most common cause of an esophageal rupture? Most injuries that cause esophageal ruptures occur during medical procedures, especially endoscopic procedures that treat your esophagus through the endoscope.
Micro-tubes have small diameters and thin wall thicknesses. When using double-layer gas-assisted extrusion (DGAE) technology to process micro-tubes, due to the influence of flow resistance, airflow from the inner gas-assisted layer cannot …
In this study, failure of a high pressure economizer tube of a boiler used in gas-Mazut combined cycle power plants was studied. Failure analysis of the tube was accomplished by taking into ...
The inner-wall structure of the failed tube sample 1 also depicted similar microstructure with a surface scale layer. The microstructural features of the tube sample 1 clearly indicated localized overheating of the tube material [2, 5]. The occurrence of a mixed microstructure of ferrite and Widmansttaten ferrite indicated that the rupture has pos-
Tubes of super-heaters and heaters used in conventional power plants are exposed to coolant and high tempera-tures. The growing oxide layer on the inner surface reacts over time as a heat insulator on the water side and reduces heat transfer through the wall of the tube. A relatively thin oxide layer already contributes to the boiler
Since the last decades, solar energy has been used worldwide to overcome foreign dependency on crude oil and to control the pollution due to a limited source of non-renewable energy.
Solar collector is a significant part of solar air and water heater system. Solar collectors are devices that are used to absorb the energy from the sun, convert the incoming solar radiation into ...
Steam or water hammer is a powerful force and can cause the rupture or collapse of either the shell or the tubes of a heat exchanger. Hammer generally occurs where there has been a surge in pressure commonly caused by a sudden interruption in cooling water flow, the rapid vaporization of stagnant water or pump malfunction.
The new evacuated tube design consists of an inner and outer tube. The both ends of the double glass tubes are sealed together. Fig. 1 shows the structure of the straight-through all-glass evacuated tube, and its specific parameters are shown in Table 1.A high-quality borosilicate glass with a thermal expansion coefficient of (3.3 ± 0.1) × 10 −6 K −1 is used as the …
A: The inner three planets of our solar system — Mercury, Venus, and Earth — will suffer catastrophic changes due to direct interaction with the Sun''s outer layers in its future evolution to ...
Ruptures characterized by thin, sharp edges are identified as "thin-lipped" bursts (see Figure 14-3). Violent bursts of the thin-lipped variety occur when water circulation in the tube is …
The welding and rupture issues in the welding joints of these tubes intended for solar concentrators can occur due to many causes. Several research studies have been …
It has also been reported that the thermal stresses may cause a bending of the absorber tube, causing a rupture of the glass cover. This bending has been associated with the …