Pump-over: Difference between revisions

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'''Pump-over''' (also known by the French term ''remontage'' or ''pumping over'') is a cap management technique used primarily during the fermentation of red wine. It involves drawing fermenting must from the bottom of a tank and pumping it over the floating cap of grape skins in order to submerge it and promote extraction.<ref>Robinson ~~(ed.)~~, ''~~The~~ Oxford Companion to Wine'', Oxford University Press, 2015, ISBN ~~978-0198705383~~.</ref>

'''Pump-over''' (also known by the French term ''remontage'' or ''pumping over'') is a cap management technique used primarily during the fermentation of red wine. It involves drawing fermenting must from the bottom of a tank and pumping it over the floating cap of grape skins in order to submerge it and promote extraction.<ref>Jancis Robinson, ''Oxford Companion to Wine'', Oxford University Press, 17 Sept. 2015. ISBN 9780198705383.</ref>

== Purpose and function ==

During [[alcoholic fermentation]] of red wine, carbon dioxide produced by yeast causes grape skins to rise to the surface, forming a solid cap. [[Pumping over]] serves several functions: it keeps the cap moist, improves contact between juice and skins, redistributes heat, and introduces controlled amounts of oxygen into the fermenting must.<ref>Boulton ~~et al~~., ''Principles and Practices of Winemaking'', Springer, ~~1999,~~ ISBN ~~978-0834217011~~.</ref>

During [[alcoholic fermentation]] of red wine, carbon dioxide produced by yeast causes grape skins to rise to the surface, forming a solid cap. [[Pumping over]] serves several functions: it keeps the cap moist, improves contact between juice and skins, redistributes heat, and introduces controlled amounts of oxygen into the fermenting must.<ref>Roger B. Boulton, Vernon L. Singleton, Linda F. Bisson, Ralph E. Kunkee, & 1 more, ''Principles and Practices of Winemaking'', Springer, 31 Oct. 1998. ISBN 9780834212701.</ref>

By increasing juice–skin contact, pump-overs facilitate the extraction of colour compounds, tannins and aroma precursors from the skins. The technique also helps prevent the growth of spoilage microorganisms on a dry cap.

== Technique ==

In a typical pump-over, wine or must is withdrawn from the bottom valve of a fermentation vessel and sprayed or poured over the cap. This may be done using hoses, fixed spray devices or rotary sprinklers, depending on winery design and scale.<ref>Jackson, ''Wine Science''~~, 5th ed.~~, Academic Press, 2020, ISBN ~~978-0128161180~~.</ref>

In a typical pump-over, wine or must is withdrawn from the bottom valve of a fermentation vessel and sprayed or poured over the cap. This may be done using hoses, fixed spray devices or rotary sprinklers, depending on winery design and scale.<ref>PhD Jackson, Ronald S., ''Wine Science: Principles and Applications'', Academic Press Inc, 14 April 2020. ISBN 9780128161180.</ref>

Pump-overs can vary in duration, frequency and intensity. Gentle, short pump-overs are often favoured early in fermentation to encourage colour extraction, while more vigorous or extended regimes may be used to build tannin structure in wines intended for ageing.

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== Role in wine style ==

The choice and management of pump-over regimes play a significant role in shaping wine structure, colour intensity and mouthfeel. Frequent or aggressive pump-overs tend to produce more structured wines with higher tannin extraction, while restrained use supports softer, fruit-forward styles.<ref>Waterhouse ~~et al.~~, ''Understanding Wine Chemistry'', Wiley, 2016, ISBN ~~978-1118627808~~.</ref>

The choice and management of pump-over regimes play a significant role in shaping wine structure, colour intensity and mouthfeel. Frequent or aggressive pump-overs tend to produce more structured wines with higher tannin extraction, while restrained use supports softer, fruit-forward styles.<ref>Andrew L. Waterhouse, ''Understanding Wine Chemistry'', Wiley, 19 Aug. 2016. ISBN 9781118627808.</ref>

As with all cap management techniques, pump-overs must be adapted to grape maturity, fermentation temperature and overall winemaking objectives.

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-'''Pump-over''' (also known by the French term ''remontage'' or ''pumping over'') is a cap management technique used primarily during the fermentation of red wine. It involves drawing fermenting must from the bottom of a tank and pumping it over the floating cap of grape skins in order to submerge it and promote extraction.<ref>Robinson (ed.), ''The Oxford Companion to Wine'', Oxford University Press, 2015, ISBN 978-0198705383.</ref>
+'''Pump-over''' (also known by the French term ''remontage'' or ''pumping over'') is a cap management technique used primarily during the fermentation of red wine. It involves drawing fermenting must from the bottom of a tank and pumping it over the floating cap of grape skins in order to submerge it and promote extraction.<ref>Jancis Robinson, ''Oxford Companion to Wine'', Oxford University Press, 17 Sept. 2015. ISBN 9780198705383.</ref>
 == Purpose and function ==
-During [[alcoholic fermentation]] of red wine, carbon dioxide produced by yeast causes grape skins to rise to the surface, forming a solid cap. [[Pumping over]] serves several functions: it keeps the cap moist, improves contact between juice and skins, redistributes heat, and introduces controlled amounts of oxygen into the fermenting must.<ref>Boulton et al., ''Principles and Practices of Winemaking'', Springer, 1999, ISBN 978-0834217011.</ref>
+During [[alcoholic fermentation]] of red wine, carbon dioxide produced by yeast causes grape skins to rise to the surface, forming a solid cap. [[Pumping over]] serves several functions: it keeps the cap moist, improves contact between juice and skins, redistributes heat, and introduces controlled amounts of oxygen into the fermenting must.<ref>Roger B. Boulton, Vernon L. Singleton, Linda F. Bisson, Ralph E. Kunkee, & 1 more, ''Principles and Practices of Winemaking'', Springer, 31 Oct. 1998. ISBN 9780834212701.</ref>
 By increasing juice–skin contact, pump-overs facilitate the extraction of colour compounds, tannins and aroma precursors from the skins. The technique also helps prevent the growth of spoilage microorganisms on a dry cap.
 == Technique ==
-In a typical pump-over, wine or must is withdrawn from the bottom valve of a fermentation vessel and sprayed or poured over the cap. This may be done using hoses, fixed spray devices or rotary sprinklers, depending on winery design and scale.<ref>Jackson, ''Wine Science'', 5th ed., Academic Press, 2020, ISBN 978-0128161180.</ref>
+In a typical pump-over, wine or must is withdrawn from the bottom valve of a fermentation vessel and sprayed or poured over the cap. This may be done using hoses, fixed spray devices or rotary sprinklers, depending on winery design and scale.<ref>PhD Jackson, Ronald S., ''Wine Science: Principles and Applications'', Academic Press Inc, 14 April 2020. ISBN 9780128161180.</ref>
 Pump-overs can vary in duration, frequency and intensity. Gentle, short pump-overs are often favoured early in fermentation to encourage colour extraction, while more vigorous or extended regimes may be used to build tannin structure in wines intended for ageing.
@@ Line 22: / Line 22: @@
 == Role in wine style ==
-The choice and management of pump-over regimes play a significant role in shaping wine structure, colour intensity and mouthfeel. Frequent or aggressive pump-overs tend to produce more structured wines with higher tannin extraction, while restrained use supports softer, fruit-forward styles.<ref>Waterhouse et al., ''Understanding Wine Chemistry'', Wiley, 2016, ISBN 978-1118627808.</ref>
+The choice and management of pump-over regimes play a significant role in shaping wine structure, colour intensity and mouthfeel. Frequent or aggressive pump-overs tend to produce more structured wines with higher tannin extraction, while restrained use supports softer, fruit-forward styles.<ref>Andrew L. Waterhouse, ''Understanding Wine Chemistry'', Wiley, 19 Aug. 2016. ISBN 9781118627808.</ref>
 As with all cap management techniques, pump-overs must be adapted to grape maturity, fermentation temperature and overall winemaking objectives.