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New Type of Gauges Permitted for Gas Tests
The Department of Buildings has authorized the use of gas pressure gauges other than mercury gauges.
We reprint the Department's Technical PPN 2/99 issued by Deputy Commissioner Richard Visconti
on January 28, 1999.
PURPOSE:
To permit the testing of gas pressure using gauges other than mercury gauges in order to
reduce the potential hazard posed by equipment containing mercury.
SPECIFICS:
Conversion Factor:
A pressure of six (6) inches (15.24 cm) of mercury is equivalent to 3 psig (20.68kPa).
Requirements:
A gas pressure of 3 psig (20.68kPa) taken using a spring or digital gauge for a minimum
of 30 minutes is equivalent of a gas pressure of six (6) inches (15.24 cm) of mercury
taken using a mercury gauge for a minimum of 30 minutes. The appropriate reading may be taken
using a mercury, spring or digital gauge.
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