Section 10: Spraying Operations

Introduction

In the industrial setting, spraying of parts is accomplished with many processes, including conventional air spray, airless spray, powder coat, electrostatic, and atomization. Suitable mechanical exhaust ventilation to adequately remove flammable and combustible air contaminants for spraying operations must be established. Housekeeping and ventilation equipment maintenance programs are also necessary for spraying operations.

Guide

10.1. All spraying areas must be provided with ventilation that adequately removes flammable vapors, mists, or powders and also provides adequate volumes of quality make-up air in enclosed areas.  Spray booths using exhaust air filters must maintain an average air velocity of 100 feet per minute.  Contaminated air should not be circulated or re-entrained into another makeup air unit intake.
10.2. Spray areas must be kept free of ignition sources such as hot surfaces, open flames / lights, electrical motors, sparks, etc.
10.3. Lights, switches, outlets, motors, etc. in spray areas must be suitable for the hazardous location; i.e., explosion-proof and properly located when installed.
10.4. Sprinkler heads must be kept clean so as to operate within their designated parameters.  Sprinkler heads which have become sprayed should be replaced; in such an instance, an evaluation should be undertaken to prevent re-occurrence.
10.5. "No Smoking" signs must be posted in hazardous areas where paint containing flammable/ combustible materials are used.
10.6. All spray areas must be kept free of the accumulation of spray residue.  Spray residue provides a source of potential explosive and/or fire hazard.
10.7. All spray booths must be constructed of non-combustible materials to prevent the spread of fire.  This includes spray booth floors and baffles.
10.8. Refer to 10.3.
10.9. Belts, pulleys, and other power transmission devices must be fully enclosed to prevent contact with spray residue.
10.10. Ducts and filters must be scheduled for cleaning as appropriate.
10.11. Adequate ventilation and design of drying spaces is essential to control heat accumulation and contact with ignition sources.

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Table of Contents

Introduction
Getting Started
Survey Checklists

Reference Guide

Appendix I
Sources of Information & Assistance

Appendix II
Forms

Appendix III
Review of Basic Fire Hazards

Appendix IV
Facility Survey

Appendix V
Selected NFPA Reference Codes

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