The mechanical pump is employed in order to have an adequate and positive circulation in steam and hot water boilers.
[2] In 1918, Walter Douglas La Mont [de] brought the forced circulation boiler from concept into existence.
[5] The time needed for a La Mont Boiler to be able to deliver an evaporation rate of 100,000 pounds per hour was between 15 and 20 minutes.
The boiler heating surfaces includes a number of tubes arranged in a parallel form and the inlet ends are welded to the distributors or the headers.
A circulation pressure is to be provided during the installation of the pump as per the boiler design and it should be sufficient to over come the resistance offered by the tubes.