Many big buildings in our older cities use vacuum pumps to create a negative pressure in their condensate-return lines. This below-atmospheric pressure, which averages ar...
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Archive for May, 2017
Vacuum Pumps and Common Sense
Life's Painful Lessons
The most-immovable object I ever merrily walked into in the moist darkness of an old building's basement was the downturned, fully extended stem of a large OS&Y steam val...