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[[File:Coolship1.jpg|thumbnail|right|Copper Coolship at a brewery in Prague]]
'''Coolship''' (Anglicized version of the Dutch/Flemish ''koelschip''; ''kühlschiff'' in German) is a type of fermentation vessel used in the production of beer. Traditionally, a ''coolship'' is a broad, open-top, flat vessel in which wort cools, and is an integral step in the process of making Belgian lambic. The high surface to mass ratio allows for more efficient cooling. Some German brewers also still use coolships to partially cool wort to 75°C (167°F) before transferring the hot wort to a fermenter <ref>[http://craftybeergirls.com/2018/03/18/coolship-field-trip/ Lauren Lerch. "Coolship Field Trip". Crafty Beer Girls blog. Retrieved 03/18/2018.]</ref><ref>[http://www.uerige.de/brauerei-brauprozess.html "Malz – aus Gerste und Weizen ". Zum Uerige website. Retrieved 03/18/2018.]</ref>. Contemporary usage includes any open fermentor used in the production of beer, even when using modern mechanical cooling techniques. Traditionally, ''coolships'' were constructed of wood, but later were lined with iron or copper for better thermal conductivity. See also the [http://www.milkthefunk.com/ccc/ MTF Coolship Cooling Calculator]. See [[Spontaneous_Fermentation#Cooling|Spontaneous Fermentation]] for information on dissolved oxygen in wort that is cooled overnight in a coolship.
A less common practice that has been gaining some traction in the US is using a portable coolship. These coolships are designed to be transported, often in the back of pickup trucks. The coolship should have a baffle that prevents the dangerously hot wort from spilling out of the coolship. The coolship can then be transported anywhere to inoculate the wort. See [http://allaboutbeer.com/article/portable-coolships/ this All About Beer Magazine article].