NESHAP stands for National Emission Standards for Hazardous Air Pollutants and are standards set by the EPA for hazardous air pollutants. These emission standards are the legal requirements governing air pollutants that are released into the atmosphere. Emission standards set quantitative limits on the permissible amount of specific air pollutants that may be released from specific sources over specific time frames.
In the past, many vapor degreasing companies used TCE (Trichloroethylene), or 1.1.1 or Trike, or TriChor in their vapor degreasing operations. These chlorinated solvents along with PERC (Perchloroethylene) and methylene chloride are regulated solvents under NESHAP standards.
In order to properly use these vapor degreasing solvents, certain vapor degreasing equipment features are needed to minimize the emissions. Note: this information is not meant to be a comprehensive list of vapor degreasing features, nor is it meant to be a detailed discussion of standards and solvent practices. The intent is to articulate some of the vapor degreasing equipment features that make a vapor degreaser NESHAP compliant.
One of the most effective ways to comply with regulations is to install an automated basket handling system (a.k.a. automated hoist, automated lift) onto your vapor degreaser.
NESHAP stipulates a certain rate which the basket must move (both vertically and horizontally) to minimize solvent emissions. The requirement for part basket movement is 11 feet/minute. (To be honest this feels quite slow) but this slow movement reduces the solvent vapor agitation, and thus reduces the possibly of the vapors being emitted out the top of the vapor degreaser.
The standards also stipulate the part basket needs to have adequate draining time prior to removal from the degreaser and that the parts being cleaned do not absorb the solvent and thus allow the solvent to flash into the open air once removed from the unit.
In essence it is very difficult for a manual operator to comply with the part basket handling requirements (impatience is really the issue as dwell times, solvent flash off times, reduced movement times through the various zones of the degreaser can make part processing tedious for a human operator).
ULTRA Automated Basket Handling Systems allow you to program the part processing recipe to meet NESHAP requirements while ensuring dwell time, solvent flash off / draining times and ultrasonic immersion times are consistent each and every part basket processed.