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Odor Fade

Odor fade (loss of odorant) can cause the odorant to diminish so that it is not detectable. Do not rely on your sense of smell alone to detect the presence of natural gas.

Odor fade is caused by physical and chemical processes. It occurs predominantly in installations of new pipe rather than in existing pipe. Odor fade is more pronounced in new steel pipe and in pipes of larger diameter and longer length. However, it can also occur in plastic pipe installations. In addition, if a natural gas leak occurs underground, the surrounding soil my cause odor fade. New installations or additions of pipe may require the conditioning of the pipe before it is placed into service to prevent odor fade. Other factors that may cause odor fade include:

  • Construction and configuration of the customer’s gas facilities
  • Presence of rust, moisture, liquids or other substances in the pipe
  • Gas composition, pressure and flow

Intermittent, little or no gas flow over an extended period of time may also result in the loss of odorant until gas flow increases or becomes more frequent. Remember, do not rely on your sense of smell alone to detect the presence of natural gas. If you have additional questions or concerns regarding odor fade, call Mobile Gas at 251-476-8052.