3.4 c oMplIance t o a pplIcaBle c odes
This Powder Application Booth is designed to be in strict accordance with the National Fire Protection Association Standard Number 33, “Spray Application Using Flammable Combustible Materials. The NFPA Standard Safety Code for the Design, Construction and Ventilation of Spray Finishing Operations.” This powder application booth meets or exceeds the requirements of the Occupational Safety and Health Administration (OSHA). 3.5 M aterIal s pecIFIcatIons The powder booth panels, filter racks and product doors are constructed of 18- gauge steel, conforming to ASTM A527 “Lock Forming Quality” and are hot dipped galvanized per ASTM A525. All structural steel conforms to ASTM A36. 3.6 g eneral d escrIptIon The powder application booth consists of four major components: powder application area, collection/extraction chamber, exhaust fan and chamber, and in some cases product doors. A brief description is provided for these and other related items. 3.6.1 p oWder a rea The powder area is the actual “booth” part of the spray powder booth. Parts are placed in this area, through booth opening or product doors, if so equipped. Air flows through the booth opening(s) to the exhaust filters. Exhaust filters will vary based on the style of booth purchased. The booth exhaust is routed the exhaust plenum(s) at the exit of the booth. The exhaust fan then routes the exhaust out through the final filters and discharges clean contaminate free air back into the powder coating room 3.6.2 e xhaust F an a nd c haMBers The Spray to Waste Industrial Batch Powder exhaust chamber is located as shown in the mechanical drawing package which is included in this manual. Powder laden air is drawn through a three stage filtration system (pre filter, primary filter and final filter) by a tube axial fan which is powered by an ODP motor. Filters clean the air of powder allowing it to return into the plant environment. The fan is made of spark resistant material and the motor is located out of the air stream. The exhaust chamber(s) operate(s) under a negative pressure to induce the required airflow through the exhaust filters. The Recovery Powder Booth exhaust is located as shown in the mechanical drawing package which is included with this manual. Powder laden air is drawn through a two stage filtration system (primary cartridge filter and final HEPA filter) using a plug style fan with a TEFC type motor. Clean air is returned to the plant environment. 3.6.3 p roduct d oors (o ptIonal ) The product doors can be filtered or solid and may be either overhead doors, bi-fold doors, or tri-fold doors. Some industrial powder application booths have an open front in lieu of product doors. Overhead doors are equipped with an intrinsically safe pneumatic safety edge. There are two 3-button controls to operate each door. Doors can be manually operated also. 3.6.4 d oor l atch (o ptIonal ) Door latches secure doors in closed position and hold contact against foam rubber seal. Latches are pressure relief latches that allow doors to open in case of explosion. This feature also allows for ease of booth operator egress from powder application booth by applying moderate pressure to the door from inside booth.
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