Trevithick was the first to successfully use high-pressure steam (then known as "strong" steam). Until ca. 1800, the weakness of existing boilers coupled with the influence of James Watt had generally restricted steam boilers to very low pressures or "weak" steam.
The steam generators are designed and manufactured in accordance with Sections II, III, and IX of the ASME Boiler and Pressure Vessel Code. Westinghouse introduced the vertical U-tube steam generator having an integral steam drum for the world's first