Ventilation Requirements for a 9ft deep pit used for toe set operation
Ventilation Requirements for a 9ft deep pit used for toe set operation
(OP)
Hello Guys,
I am doing some ventilation and exhaust calculations for an underground pit which is used for the toe in operation in automotive industry. I was wondering what is the minimum exhaust or ventilation criteria for this application. I have come across 6 ACH but I am not sure and I don't have any references. Please advise and if you could tell me the code/reference to ASHRAE or ACGIH or anything, that will be great. Thanks
I am doing some ventilation and exhaust calculations for an underground pit which is used for the toe in operation in automotive industry. I was wondering what is the minimum exhaust or ventilation criteria for this application. I have come across 6 ACH but I am not sure and I don't have any references. Please advise and if you could tell me the code/reference to ASHRAE or ACGIH or anything, that will be great. Thanks





RE: Ventilation Requirements for a 9ft deep pit used for toe set operation
your specific case likely isn't covered by ASHRAE or code.
RE: Ventilation Requirements for a 9ft deep pit used for toe set operation
RE: Ventilation Requirements for a 9ft deep pit used for toe set operation
RE: Ventilation Requirements for a 9ft deep pit used for toe set operation
I did a few of these, the uaual treatment was a metalic duct 4" in diameter clamped into the corner of the pit terminating one diameter above the floor of the pit, with ducting in a channel across the floor of the building to a point outside the building. Then a centrifugal fan with a TEFC motor, and a duct away from anything flammable, usually up the side of the building. This was good for CO and Gasoline fumes.
B.E.
RE: Ventilation Requirements for a 9ft deep pit used for toe set operation
RE: Ventilation Requirements for a 9ft deep pit used for toe set operation
You are right, Most of the pits I worked on were 4.5 to 5.0 deep. The 9 feet deep ones were for Tricloroethane tanks for degreasers.
B.E.
RE: Ventilation Requirements for a 9ft deep pit used for toe set operation
RE: Ventilation Requirements for a 9ft deep pit used for toe set operation
You are right, Most of the tanks used to have chilled water coils about 2 feet down from the top of the tank. The vent fan at the base of the pit was to catch fugitive vapors that cascaded over as parts were moved in and out of the tanks.
During operation of those degreasing baths , nobody was allowed into the pit. Maintenance personel were only allowed down there after the heaters had been shut off for several hours. Then only with a lifeline attached and a watch person on the top of the pit.And the vent fan running!
For the most part these things are going away because of Environment agency and EPA rules.
B.E.
RE: Ventilation Requirements for a 9ft deep pit used for toe set operation