Impact of Wireless Laser Based Shaft Alignment on Vibration and STG Coupling Failure

2007 ◽  
Author(s):  
Ned M. Endres ◽  
E. Peyton Swan
Keyword(s):  
Case History ◽  
Recent Case ◽  
Software Technology ◽  
Alignment Condition ◽  
Dynamic Movement ◽  
Thermal Growth ◽  
Shaft Alignment ◽  
Dial Indicator ◽  
Excellent Accuracy

Proper shaft-to-shaft alignment during normal machinery operation is essential for improved machinery reliability. Having the proper tools to perform an accurate coupling alignment are critical to maximized maintenance efficiency. Improvements in hardware and software technology have greatly simplified coupling alignment procedures. A comprehensive machine alignment consists of two elements: measurement of the shaft-to-shaft alignment and measurement of the thermal growth and dynamic movement of each bearing housing. Accurate measurement of these elements should be used to position the cold alignment condition in order to properly align the shaft under loaded conditions. Shaft-to-shaft alignment is typically measured using either laser or dial-indicator instrumentation. RoMaDyn used a laser based system utilizing bluetooth technology for shaft alignment readings. This system provides excellent accuracy, flexibility, and fast results. Often if unit casing temperatures change little immediately after a hot coast down, relative shaft to shaft thermal growth measurements can be acquired using laser coupling alignment readings. Hot and cold alignment data can then be incorporated into an alignment drawing to determine measured shaft relative thermal growth. The measured thermal growth readings or OEM calculated growth numbers are then incorporated into the cold unit alignment settings to provide the best hot alignment condition. This paper will discuss a recent case history involving chronic coupling failures at a customer’s facility. Acquired vibration and shaft alignment readings will be discussed. These measurements will illustrate the effects of alignment changes on machinery vibration levels and coupling reliability.

Indicator type device for aligning of pump shafts

2021 ◽  
pp. 42-44
Author(s):  
Keyword(s):  
Electric Motor ◽  
Type Device ◽  
Shaft Alignment ◽  
Neodymium Magnets ◽  
Dial Indicator ◽  
Indicator Type

An indicator centering device based on neodymium magnets is developed, which makes it possible to control the axial and radial clearances. The general methods of alignment used in production are considered. Keywords: shaft alignment, dial indicator, electric motor, pump, half-coupling [email protected]

scholarly journals Boerhaave’s Syndrome: A Review of the Initial Management with Illustrative Case History

2007 ◽  
Vol 6 (2) ◽  
pp. 60-64
Author(s):  
Khai Ping Ng ◽  
◽  
Sue Brauer ◽  
J Snape ◽  
◽  
...  
Keyword(s):  
High Mortality ◽  
Case History ◽  
Rare Condition ◽  
Recent Case ◽  
Illustrative Case ◽  
Boerhaave’S Syndrome ◽  
Significant Morbidity ◽  
Initial Management ◽  
Front Door ◽  
Boerhaave's Syndrome

Boerhaave’s syndrome is a rare condition on the acute medical ‘take’ but has a high mortality and significant morbidity if not diagnosed early. This article reviews the approach to management at the ‘front door’, summarising the initial investigations and treatment. A recent case presenting to our unit is included at the end of the review to illustrate some of the issues raised.

scholarly journals PENGARUH PEMUAIAN PANAS TERHADAP KELURUSAN POROS TURBIN UAP

2020 ◽  
Vol 14 (1) ◽  
pp. 71-76
Author(s):  
Dwijaya Febriansyah ◽  
Barman Tambunan ◽  
Rudias Harmadi ◽  
Budi Noviyantoro Fadjrin
Keyword(s):  
Steam Turbine ◽  
Vertical Plane ◽  
Alignment Method ◽  
Rotating Machines ◽  
Laser Alignment ◽  
Thermal Growth ◽  
Shaft Misalignment ◽  
Shaft Alignment ◽  
Cold Condition

Sebagian besar penyebab kegagalan pada mesin-mesin rotasi termasuk turbin uap adalah poros yang berputar dalam kondisi misalignment. Pada turbin uap, panas yang merambat pada casing dapat merubah dimensi turbin uap karena adanya pemuaian (thermal growth) sehingga mempengaruhi kelurusan poros saat berputar. Nilai thermal growth ini perlu diketahui sebagai salah satu spesifikasi dalam penyetelan poros sebelum turbin beroperasi. Dalam studi ini,  thermal growth pada turbin uap 3 MW diinvestigasi dengan mengukur kelurusan poros dalam kondisi panas setelah berhenti berputar dan dingin menggunakan metode laser alignment. Hasil pengukuran menunjukkan bahwa thermal growth memberikan pengaruh terhadap kelurusan poros karena adanya selisih nilai kelurusan poros saat kondisi panas dan dingin yaitu 1.0 thous (gap) dan 2.8 thous (offset) pada bidang vertikal kemudian -1.0 thous (gap) dan -2.7 thous (offset) pada bidang horisontal.Kata kunci : Turbin uap, Thermal growth, Kelurusan porosMost of the causes of rotating machines failure including steam turbine is shaft misalignment. In the steam turbine, heat that travels to the casing can change steam turbine dimension due to thermal growth which affects the shaft alignment. Thermal growth values needs to be known as one of the specifications in shaft alignment setup. In this study, thermal growth on 3 MW steam turbine was investigated by measuring the shaft alignment in hot after shut down and cold condition using laser alignment method. Results show that thermal growth has an influence on shaft alignment due to difference of alignment values when hot and cold conditions, namely 1.0 thous (gap) and 2.8 thous (offset.) in vertical plane then -1.0 thous (gap) and -2.7 thous (offset.) in horizontal plane.Key Words : Steam Turbine, Thermal growth, Shaft alignment 

Investigation on hull deflection and its influence on propulsion shaft alignment

2005 ◽  
Author(s):  
Davor Šverko
Keyword(s):  
Loading Condition ◽  
Sufficient Accuracy ◽  
Major Contributor ◽  
Optimization Software ◽  
Hull Girder ◽  
Alignment Condition ◽  
Different Types ◽  
Shaft Alignment ◽  
Small Disturbances

As is well-known, tail shaft alignment is sensitive to small disturbances in the vertical offsets of shaft supporting bearings. A major contributor to the bearing offset on board a vessel in operation is the hull girder deflections resulting from changes in the loading condition of the vessel. Therefore the ability to predict hull deflections with sufficient accuracy is of foremost importance in tail shaft alignment design. In order to achieve this objective, ABS has conducted a series of hull girder deflection measurements on a number of vessels of different types and sizes. Collected data are applied to the ABS Shaft Alignment Optimization software to provide a basis for checking shaft alignment design to assess susceptibility to alignment condition changes during the operations of the vessel.

Pillar failure in shallow coal mines—a recent case history

2000 ◽  
Vol 109 (3) ◽  
pp. 146-152 ◽  
Author(s):  
K. E. Sizer ◽  
M. Gill
Keyword(s):  
Case History ◽  
Coal Mines ◽  
Recent Case

Shaft Alignment Using Strain Gages: Case Studies

1999 ◽  
Vol 36 (02) ◽  
pp. 77-91
Author(s):  
Bruce Cowper ◽  
Al DaCosta ◽  
Stephen Bobyn
Keyword(s):  
Mathematical Modeling ◽  
Case Studies ◽  
Strain Gage ◽  
The Other ◽  
Strain Gages ◽  
Traditional Methods ◽  
Alignment Condition ◽  
Shaft Alignment ◽  
Marine Vessels ◽  
Optical Laser

Two case studies are presented in which measurement and modeling programs were undertaken to assess the installed shaft alignment condition on marine vessels. One on the CCGS Earl Grey, and the other on the HMCS Huron. In both cases catastrophic damages had previously occurred to shaftline components, which were suspected to be a result of shaft mis-alignment. The damaged components were repaired, and the shaftlines were re-aligned using traditional methods (optical/laser). To assess the alignment condition of the installed shaftlines, measurements were taken by using the strain gage technique. In one case the shaft was realigned according to the strain gage measurements. Mathematical modeling was also conducted to assess the implications of the alignment measurements, and to provide the means to estimate the offsets of the installed bearings from their prescribed positions.

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