![]() |
![]() |
![]() |
-Pyrophorics |
STANDARD OPERATING CONFIGURATION The Standard Operating Configuration (SOC) is the position at which the hood sash should be placed when the hood is actually in use as a containment device. Making such an assumption is unavoidable when designing a fume hood exhaust system since determines the quantity of air the system must exhaust if an adequate face velocity is to be maintained. In order to obtain the recommended 100 fpm face velocity, many fume hoods have an SOC which is less than a fully open sash. If a hood user does not use the hood with the sash at the SOC position, it is possible for that user to create a situation in which an otherwise properly operating hood has an insufficient face velocity. Each chemical fume hood at the University has an assigned Standard Operating
Configuration. A schematic drawing of this configuration is posted on
the hood face. Examples of the posted schematics are shown below. Listed
below are brief descriptions and the SOC’s of several styles of fume hoods
commonly found at the University. Questions about the SOC of a specific
hood may be addressed to the Office of Environmental Health and Safety.
SOC for Horizontal Sash (numbers are measurement points) 5. Walk-In Hood - a maximum face opening six feet or more high and extends to floor level. At Princeton, this style is usually equipped with two vertical rising sashes mounted in parallel tracks and each capable of closing half the face opening. The SOC is one half of the face open. 6. California Hood - a free standing bench top enclosed on all sides by transparent material for a height of four feet or more above the bench, and ventilated. Horizontal sliding doors provide access from two opposite sides. The SOC is all doors closed. 7. Triple-Vertical Sash - three adjacent vertical-rising sashes, the center one of which is 18" wide, in an otherwise standard vertical sash hood. The SOC is center sash down and sashes on both sides fully raised. SOC for Triple Vertical Sash (numbers are measurements points)
|
|
For a disclaimer and information regarding the use of this page, see the disclaimer notice. Web page comments: marcians@princeton.edu. |