m2e
Mechanical
- Jun 28, 2006
- 92
A sewage lift station is being designed for a residential area, so an odour control unit is required to maintain the below-grade chamber in a negative pressure. A blower-heater unit sits on top the wet well to provide tempered make-up air so the liquid won't freeze. The unit we're using is this: http://dexoncanada.com/fieldtest/?factrie-service=smdh-blower-heaters
For energy saving, the air flow rate is just enough to provide some negative pressurization, but not big enough to declassify the wet well. According to NFPA 820, the entire wet well is Class 1 Div. 1.
The blower-heater is located on top, so outside the wet well, and is pushing fresh air into the wet well. Would it be ok if the blower-heater is rated for Class 1 Div. 2? Class 1 Div. 1 is not available.
For energy saving, the air flow rate is just enough to provide some negative pressurization, but not big enough to declassify the wet well. According to NFPA 820, the entire wet well is Class 1 Div. 1.
The blower-heater is located on top, so outside the wet well, and is pushing fresh air into the wet well. Would it be ok if the blower-heater is rated for Class 1 Div. 2? Class 1 Div. 1 is not available.
