Boiler Feed Water Pump Research Articles

ボイラ給水ポンプ軸の寿命診断用小型Ｘ線応力測定装置

Boiler feed water pump shafts are subjected to severe thrust loads and cyclic bending moments. Half-value width and residual stress measurements by X-ray diffraction methods, which are sensitive to fatigue damage, are employed for the fatigue life assessments of pump shafts. In order to establish a damage detection system, a portable, light-weight X-ray diffraction apparatus with a rotating receiving slit and X-ray detector and a small diameter X-ray tube has been developed. Consequently, the residual stress can be measured within 20 minutes which is about half the time required using a conventional apparatus. The X-ray apparatus has been installed in a system with a specially designed mechanical scanner for a pump shaft, and as a result, the fatigue damage can be automatically measured on the pump shaft surface. The system has been applied to more than 150 actual pump shafts in a factory during in-service inspections.

Development and Testing of a New Thermal-Acoustic Industrial Insulation

Abstract This article grew out of a project to investigate the feasibility of applying current engineering technology to the control of noise exposures in modern electric generating plants. In the course of the project, a new insulating product, which successfully combines both acoustical and thermal insulating properties, was developed and operationally tested in an electric generating plant. The product consists of a composite of several materials selected to provide attenuation of noise and process heat. The result is a reusable, flexible insulating blanket that can be custom fitted to any shape of process equipment. Following laboratory tests of several candidate materials, one was selected for full-scale tests on high-speed boiler-feedwater pumps in an electric power plant. The field tests showed a noise reduction of 10 to 30 decibels in the frequency range of 250 to 4000 Hz. It is thought that at least 10 decibels of mid-frequency noise attenuation can be achieved on noisy process equipment such as ...

The Thermal–Hydraulic Design of Main Feed Water Pump Suction Systems for Large Thermal Power Plant

British domestic design practice is described for boiler feed pump suction systems associated with high level deaerator/feed water tanks in large modern power plant. The objective of thermal–hydraulic design is the provision of adequate pressure to boiler feed water pump suctions under all transient and steady state conditions to ensure continuity of water flow and reliable pump operation. Methods are available for the determination of pressure decay in feed tanks during load transients, but the successful application of mathematical relationships between pressure decay and pressure rise in suction pipework depends on the correct identification of operational circumstances. Progress in recent years has been on the identification of circumstances which produce governing conditions and has taken design practice beyond the stage established by early workers. Developed practice has been successfully applied by the Central Electricity Generating Board and its main plant contractors to forty-nine 500 MW units in coal- and oil-fired stations and to twenty-three 660 MW units in coal, oil and advanced gas-cooled reactor stations, which at 39 680 MW, constitutes the major proportion of plant in England and Wales. Aspects of plant behaviour and operation crucial to successful system design are featured. Recommendations are made for plant layout, pipework routing, tank outlet and pipework sizing, net positive suction head (NPSH) determination etc.

Stress Corrosion Failure of Waste Heat Boiler Tubes in an Ammonia Synthesis Converter

In a 600 tpd capacity ammonia plant, the stainless steel tubes of the waste heat boiler of the ammonia synthesis converter falled after 6644 h of operation. Investigation revealed that the boiler tubes made of AISI 321 and 310S stainless steel had suffered stress corrosion cracking due to the conjoint action of stress and a corrosive environment, namely, alkalinity and chloride. The causative factor for the failure was the non-operation of the boiler feed water pump which led to the build up of a high concentration of the corrosive ingredients in the system. The inner tubes had failed first, upsetting the circulation of water in the dead end regions of the outer tubes, leading to accelerated evaporation and subsequent deposition. This led to the stress corrosion cracking of the outer tubes. The inner tube portions embedded within the deposit subsequently suffered general and intergranular attack.

Assessment of Noise Pollution in the Ashuganj Fertilizer Industrial Area, Ashuganj

Noise pollution in industries is now a serious environmental concern in Bangladesh. In this study sound levels are observed inside the Ashuganj Fertilizer Company Ltd (AFCL) Ashuganj. Continuous running of high speed turbo machinery, vibration of pipelines and structures, transmission of high pressure gas, sudden release of high pressure gas generate noise hazard inside the factory during the time of production. The sound level data was collected at seventeen different locations in the ammonia production plant, ten different locations in the urea production plant and ten different locations in the residential area of AFCL. In the ammonia plant, significantly high level of sound was observed (>90dB) from the process gas cooler, let-down station, boiler-feed water pump, synthesis-gas compressor, process air compressor, alternator and ammonia compressor areas. In the Urea plant, Prill tower (top), Prill tower (absorber vent) are the most noise vulnerable areas with sound level >90 dB. Residential area found less affected by noise pollution (43-53 dB) but in some areas like playground, main gate of the residential area sound level sometimes cross the standard sound level of residential area (50 dB). In the ammonia and urea plant, the sound levels are much higher than the standard sound level (75 dB) for the industrial area, which is considered a hazard of noise may induce hearing loss, annoyance and other adverse effects on the health of the workers of AFCL. Therefore, some remedial measures should be taken to reduce the sound level inside the factory. Key words: Noise pollution; Ashuganj Fertilizer Company Ltd (AFCL); Ammonia production plant; Urea production plant; Sound level; Health hazard. DOI: http://dx.doi.org/10.3329/bjsir.v46i2.8184 Bangladesh J. Sci. Ind. Res. 46(2), 183-190, 2011