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Document ID (ISN)30433
CIS number 78-1836
ISSN - Serial title 0019-9109 - Industrie-Lackier-Betrieb
Year 1977
Convention or series no.
Author(s) Hess H., Liere H.
Title Safety in electrostatic powder coating
Original title Sicherheit beim EPS-Verfahren [in German]
Bibliographic information 1977, No.4, p.133-136. Illus.
Abstract The types of powder used are generally flammable when mixed with air in certain concentrations, and these always occur in the neighbourhood of the spray guns and powder recovery equipment. Ignition can be produced by electrostatic discharges with an energy of at least 5mWs. Conditions leading to spark production between the gun and the workpiece in the booth are examined. Primary safety measures against hazardous accumulation of electrostatic charges on the workpiece are described: control of the insulation resistance of the workpiece (maximum 1 megaohm) before it enters the booth; electrostatic earthing, interlocked with the equipment. Secondary measures: automatic fire detectors interlocked with the booth equipment; automatic extinguishing system; flame arrester in the pipework between the recovery equipment and the spray booth; shut-off valve actuated by the explosion shock wave; explosion vents in the recovery plant; explosion suppression by extinguishers. Recommendations are made for cleaning the booth.
Descriptors (primary) powder coating; explosion prevention; flammable dust; static electricity
Descriptors (secondary) explosion venting; resistance measurement; ignition energy; static electricity elimination; earthing; flame arresters; explosion suppression; fire detection; automatic fire protection
Document type -
Subject(s) Fire and explosions
Broad subject area(s)
Browse category(ies) Surface treatment
Explosions
Electricity