We invariably cool the compressor discharge prior to dehydration. Unfortunately, natural gas will be reheated—sometimes by 10°F — in a typical gas field dehydration contactor. This occurs because of two factors:
• The circulating glycol may be 70° hotter than the contactor gas inlet temperature.
• The heat of condensation or absorption of the water vapor contained in the wet natural gas must be dissipated into the dried natural gas.
If the glycol contactor is properly designed (see chapter 6) this temperature rise will not effect dehydration efficiency. However, transmission temperatures will increase.