There's hardly a marine application — onboard or ashore — where seawater pumps are not considered critical to a vessel's operation or purpose. The ability to pump seawater aboard most vessels represents only a part of their liquid pumping requirements; in many cases other liquids such as caustics, corrosives, and alkalis need to be transferred, either from ship to shore or vice versa. For these kinds of harsh applications many shipboard pumps are constructed of metals designed to withstand the continuous flow of severely corrosive liquids. Typically, these metals include Monel and K-Monel, titanium, nickel bronze, alloy 20 steel, and 316 stainless steel.