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Abtouren

English translation: spinning down

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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
German term or phrase:Abtouren
English translation:spinning down
Entered by: xxxRNolder
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18:01 Jul 6, 2003
German to English translations [PRO]
Tech/Engineering / Construction of power stations
German term or phrase: Abtouren
Folgende Betriebzustände sind möglich und sollen sicher durch die angebotenen Ausrüstungen im Zusammenwirken mit den anderen Komponenten der Kraftwerksanlage insbesondere dem Anhitzekessel und der Dampfturbine beherrscht werden:
- "Abfangen" aus bzw. in verschiedene Zustände; z. B. beim Abtouren, aus Nenndrehzahl, in den Leerlaufbetrieb, etc.
xxxRNolder
Local time: 15:40
spin-down
Explanation:
... with or without hyphen... "spinning down" also possible...

Here are a couple of references from air turbines (but I think I remember hearing the term applied for steam turbines, too):

http://www.turbocarver.com/techspecs/body_techspecs.html

The effect is called Carman Street Vortex and is a leading cause for bearing failure. This means when the drive air to the turbine is shut off, it takes several seconds for the turbine to spin down. During this time the turbine becomes a vacuum pump and pulls airborne contamination into the bearings.

http://www.brickboard.com/ARCHIVES/1998JAN/8206.shtml
2. The turbine is spinning at such high RPMs during boost that it will continue to spin extremely fast after the engine is turned off. The drop in oil pressure leaves the turbo bearings dry and the bearings experience wear during the spin-down. Letting the turbo spin down for 30 seconds allows the turbine to reach a sane speed before cutting the oil flow.
Selected response from:

Bernard Myers
France
Local time: 21:40
Grading comment
Excellent explanation also - thank you!
4 KudoZ points were awarded for this answer

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Summary of answers provided
3spin-down
Bernard Myers


  

Answers


50 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5
spin-down


Explanation:
... with or without hyphen... "spinning down" also possible...

Here are a couple of references from air turbines (but I think I remember hearing the term applied for steam turbines, too):

http://www.turbocarver.com/techspecs/body_techspecs.html

The effect is called Carman Street Vortex and is a leading cause for bearing failure. This means when the drive air to the turbine is shut off, it takes several seconds for the turbine to spin down. During this time the turbine becomes a vacuum pump and pulls airborne contamination into the bearings.

http://www.brickboard.com/ARCHIVES/1998JAN/8206.shtml
2. The turbine is spinning at such high RPMs during boost that it will continue to spin extremely fast after the engine is turned off. The drop in oil pressure leaves the turbo bearings dry and the bearings experience wear during the spin-down. Letting the turbo spin down for 30 seconds allows the turbine to reach a sane speed before cutting the oil flow.

Bernard Myers
France
Local time: 21:40
Native speaker of: Native in EnglishEnglish
PRO pts in pair: 77
Grading comment
Excellent explanation also - thank you!
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