Editing Engine room (section)

===Engine cooling===
{{Main|Engine cooling}}
The engine(s) get required cooling from [[Heat exchanger|liquid-to-liquid heat exchangers]] connected to fresh seawater or divertible to recirculate through tanks of seawater in the engine room. Both supplies draw heat from the engines via the coolant and oil lines. Heat exchangers are plumbed in so that oil is represented by a yellow mark on the flange of the pipes, and relies on paper type gaskets to seal the mating faces of the pipes. Sea water, or brine, is represented by a green mark on the flanges and internal coolant is represented by blue marks on the flanges.{{citation needed|date=October 2015}}