Maintenance spray equipment

Spray painting is a widely used application technique for most industrial maintenance and commercial architectural jobs. Spray painting is much faster than using brushes, pads, or rollers. A large variety of spray equipment is available, including air, airless, plural spray, and electrostatic. 

Proper maintenance of spray equipment is important to ensure continuous problem-free operation. Gun tips should be checked periodically for adhesive build up. If any is found, it should be removed to keep the spray pattern consistent. Fluid lines should be flushed periodically. Fluid pressure regulators should be cleaned periodically to keep them working properly. Spray guns should be flushed and rebuilt periodically to replace worn parts and to remove any adhesive build up. 

Re-entry into treated fields and required posting Protective clothing and equipment and its care and maintenance Pesticide poisoning effects, symptoms, and first aid Medical supervision for pesticide applicators Toxicity of pesticides Minimizing exposure Risk assessment Personal safety and hygiene Types of spray equipment Equipment parts, with emphasis on nozzles Sprayer maintenance and cleaning Sprayer storage... 

The licensed applicator should be made familiar with the various types of hand, ground, and aerial equipment available and with the various parts and functions of spray equipment. The applicator must be skilled in sprayer equipment calibration, maintenance, cleaning, and storage. The applicator should know that proper calibration of spray... 

The second question asked what would be an excessive temperature for this process. It was recommended that process hot spots (i.e., zones higher than 100°C) should be avoided. This requirement was met by keeping the heating lines, the walls of the melting pot, and the spray head thermally jacketed to maintain the appropriate internal soak temperature. As a result, the model presented a potential for hot spots at the skin surfaces of the lines and equipment walls. This needed to be investigated for its decomposition potential, and in fact, after several batches were processed, the flexible heat-traced lines had to be discarded because of a buildup of a blacked residue on the inner tubing walls. The kinetic model predicted how many batches could be run before this necessary replacement maintenance was required. 

Water sprays from monitor nozzles and hose lines can be used for vapor mitigation. Tests have been conducted in which monitor nozzles and hose lines have been used to create a chimney effect through which the gas is forced upward and dispersed at a high elevation (Beresford, 1981). Application techniques and flow rates are facility-, installation-, and material-specific. Careful planning, analyses, and testing should be conducted prior to deciding on the use of a mobile water spray as a proven means of mitigation. Preventive maintenance of this equipment is key to reliable operation. Hose lines, typically, are hydrostatically tested annually. Flow tests should also be conducted periodically. 

Improper maintenance of key equipment such bag filters where damaged bags have not been replaced or delay in replacement of damaged spray nozzles in scrubbing towers ... 

Each technique has advantages and disadvantages. Packed columns are flexible as the packing can be easily modified for optimisation of each recovery process, but they are best suited to small scale operations. Tray columns are used for large scale, low to medium flow rate applications involving non-corrosive materials. Spray systems are used almost entirely for applications where pressure drop is critical such as flue gas treatment. Types of equipment classified as spray columns include cyclone and venturi systems. Bubble column equipment is a low cost, low maintenance option however back mixing can occur which reduces the counter-current flows required for optimum absorption. 

An advantage of rotating disk and bell spray coating is its ability to atomize high-viscosity coating materials. A disadvantage is maintenance of the equipment. 

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