Instrument air dew point requirements -- 108-P, L, K

The 108 Building dew point analyzers measure dew point at atmospheric pressure. Existing 108 Roundsheets state the maximum dew point temperature shall be less than {minus}50 F. After repeatedly failing to maintain a {minus}50 F dew point temperature Reactor Engineering researched the basis for the existing limit. This report documents the results of the study and provides technical justification for a new maximum dew point temperature of {minus}35 F at atmospheric pressure as read by the 108 building dew point analyzers.