A LaMont boiler is a type of forced circulation water pipe boiler in which the boiler water is circulated through an external pump through long tubes, very separate and of small diameter. The mechanical pump is used to have a proper and positive circulation in steam boilers and hot water.
Mark Benson himself worked on the idea and later Benson worked with Herreshoff on the idea of parallel flow of forced circulation without drum boilers. Walter Douglas Lamont brought the idea of the papers into existence. Walther Douglas Mont introduced the concept of this forced circulation boiler in the year 1925. Lamont was a lieutenant commander of the navy and an engineer in the US Marines as well as a patriot. He died of a sudden and very early death and the headlines of the Niagara Falls Gazette mentioned NAVAL ENGINEER, NATIVE OF THE CITY IS THE VICTIM OF THE HEART.
Lamont's initial designs for this boiler confirmed the lightest, safest, and highest heat transfer and evaporation rates per square foot compared to standard boiler water boilers, also the circulation of vaporized water at a differential pressure of 2.5 bar was 8 to 10 times. The length of time required to start a Lamont boiler to deliver an evaporation rate of 100,000 pounds per hour was between 15 and 20 minutes and was simultaneously able to deliver peak loads. During World War II the US Navy used and relied mainly on the Babcock and Wilcox boilers that were commonly used in those years. On the other hand, thousands were built in Europe and many German and Japanese ships used La Mont Kettle, Bismark was one of them and was able to overtake the fastest steamers of the US Navy.