Steam jets create vacuum at specific conditions using a high velocity jet of steam. Many are now in need of upgrades to operate at peak efficiencies. Most commercial power plants were built between 1950 to 1970, some using inexpensive steam jets to create vacuum. Power plants also use condenser-exhausters or holding pumps to keep the steam condensers operating at peak efficiency (under vacuum). Power plants use hogging pumps to remove the air from the turbine generator and steam condenser prior to starting up the plant from a cold start. Regardless of the source of heat, electrical generating power plants use large vacuum pumps in two different parts of their operation however, they do not call them vacuum pumps. IMAGE 1: Generally recognized vacuum pressure ranges (Image courtesy of DXP Enterprises) Thermal Electrical Power Generation Choosing the right one to fit the application is often critical to the long-term success of the installation. There are many different types of vacuum pumps. The deeper the vacuum level, the more a leak can affect a process. Leaks become more of a challenge depending on the vacuum range.
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