Caelum ((주)케일럼 and formerly known as EWK, ((주)이더블유케이) is a company that manufactures geothermal, liquefied natural gas (LNG), oil and gas plants. It offers LNG products, shell and tube heat exchangers, air-cooled heat exchangers, pressure vessels, towers and columns, skids, piping spools, finning machines, and other products.