kenlpeters
New member
I have a metal enclosure (9' wide by 26' long x 10' high) which houses a generator and a gas turbine fueled by natural gas. Under normal operation, the natural gas is contained. However, it may be possible under abnormal conditions (broken line, leaking connection, etc) for natural gas to escape into the enclosure. Hence, the area is classified as a Class I, Group D, Div II area.
When operating, the enclosure is continuously purged with air from a safe area and the enclosure is equipped with a gas detection system for alarming and shut down at LEL %'s well below the combustible limts.
Questions:
1. If I have a spark free fan for the enclosure purge, I purge the enclosure say for 10 air changes and verify the LEL's are below the alarm or trip settings, prior to powering up the rest of the elctrical system within the enclosure does all the electrical equipment within the enclosure (generator, transmitters, igniter systems, lights, receptacles, etc) have to be Div II rated?
2. What is the nuimber of air changes and the rate of air changes required to make a Div II area a safe area?
Thanks
Ken
When operating, the enclosure is continuously purged with air from a safe area and the enclosure is equipped with a gas detection system for alarming and shut down at LEL %'s well below the combustible limts.
Questions:
1. If I have a spark free fan for the enclosure purge, I purge the enclosure say for 10 air changes and verify the LEL's are below the alarm or trip settings, prior to powering up the rest of the elctrical system within the enclosure does all the electrical equipment within the enclosure (generator, transmitters, igniter systems, lights, receptacles, etc) have to be Div II rated?
2. What is the nuimber of air changes and the rate of air changes required to make a Div II area a safe area?
Thanks
Ken