What happens if there is a power outage?
When the ERH “off” button is pressed or site power is lost, in situ steam generation stops instantly – like flipping off a light switch. The transition is like lifting a whistling tea kettle off the burner – steam pressure stops and only steam diffusion remains (like watching vapor rise from a hot cup of coffee on a cold day). This steam diffusion will slowly expand the heated zone at the site; it grows by about one foot per day if the vapor recovery system is not operating. When power is restored and vapor recovery resumes, the action of pulling cool air through the newly heated zone pulls the temperature front back with its previous boundaries. No VOC vapor emissions have been detected from a TRS site either during operations or following a power outage.
