Buying spray booths (paint spraying equipment) is a relatively expensive acquisition. Despite this, sometimes the frivolous attitude to such equipment by some owners is sometimes surprising.
How often to inspect the spray booth and replace the spray booth filters – we will consider in this article.
Poor technical condition, uncleaned air ducts, damage to the combustion chamber and contaminated fans pose a considerable risk of explosion and fire. Owners of auto services involved in straightening and painting work should think about exactly when the last time the maintenance of the spray booth was carried out and what actions were carried out. Years of experience show that inspections are usually limited to replacing filters, cleaning the burner nozzle and its, not always necessary, regulation. What about other elements and devices of the paint chamber – control and security systems?
If you take a closer look at the functionality, you can make sure that the spray booth requires a thorough technical inspection. Timely maintenance not only contributes to the proper operation of this rather complex equipment but also significantly extends its life. We offer several recommendations regarding the periodic inspection of the spray booth.
Speaking of a visual inspection of the technical condition of the spray booth itself and individual devices, we mean checking the tightness of the entrance gates and doors for personnel, the condition of the air channels and the channels of the exit of combustion products. It is imperative to check all screw connections, if necessary, tighten them. This also applies to screw connections on the heat exchanger and fan housings. After that, we check the condition of the filters and the tightness of the chamber, while paying particular attention to the state of the ceiling filter. Ceiling filters and recirculation filters, as well as preliminary pocket filters, are cleaned every 250 hours of operation, and every 500 hours they are replaced.
FANS AND MOTORS
During the operation of the fans, dirt settles on their blades, especially in the exhaust fan. Over several years of operation, the thickness of the deposited coat of paint can be up to 4 mm. This leads to a significant imbalance of the blades and increased load on the bearings, and also reduces the performance of the fans. Technical inspection is carried out every 1100 hours of work.
ELECTRICAL CONNECTIONS OF DEVICES AND UNITS
Speaking of electrical connections, it is necessary to check the condition of the contacts, first, the power wires, if necessary, they should be cleaned and tightened. The weakened and heated ends of the electrical wires very often are the source of fires, firstly, and secondly, the failure of electric motors. In spray booths that have been in operation for many years, it is recommended that the motor power cables are completely replaced, or, as a last resort, the installation of additional thermal fuses in their power supply. It happens that factory contactors over time have significant wear or burnt contacts and can cause a short circuit or a pause in the power supply to the motor windings, or may not work properly during switching from star to delta. Technical inspection is carried out every three months in the first year of operation, and every six months thereafter.
GATE VALVES WITH AUTOMATION
Air passage control gates are driven by servos. Contamination of gates leads to loose closing and opening, which causes the failure of the servos and their incorrect operation, which entails a failure in the operation of all automation. As a result, the spray booth works with uncertain settings, the temperature and basic modes of painting and drying are violated, which can lead to significant defects in the application of coatings. The “dye-drying” gate should work flawlessly, fully opening and closing the supply ventilation channel. Inspection – every 2300 hours of operation.
HEAT EXCHANGER AND BURNER
It often happens that the heat exchanger works until, in the absence of any checks or technical inspections, it completely burns out. In addition to the risk of fire, a damaged heat exchanger is extremely explosive. The faster the faults are identified and fixed, the longer and safer the spray booth will work. The condition of the burner affects not only fuel consumption, but, first, safety. Therefore, it is important to check the control system and the emergency shutdown of the burner. After checking and eliminating possible malfunctions, it is advisable to check the burners for the content of combustion products. Maintenance – once every three months.
The recommendations covered in this article are not instructions for self-inspection of the chamber. This is just a brief summary of what should be required of firms or persons involved in the sale and maintenance. This information should be useful to owners of paint booths today and in the future so as not to be fooled and to ensure proper maintenance of the equipment.