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  • Components
  • Working Chamber Exhaust
  • Intake
  • Air Make-Up
  • Accessories

1.1.4.a Components of Spray Booths

 

Whether complicated or simple, booths have several basic features in common:

 

-Working Chamber, Exhaust

-Intake

-Air Make-up

-Accessories

1.1.4.b Booth Components

 

All spray booth systems, regardless of their application, have a working chamber and an exhaust system.

 

Working Chamber:

 

Since the working chamber encloses the spray operation, it is of a size large enough to contain the product and provide the painter room to perform his task. The recommended Working Depth is usually 5 to 6 feet wider and deeper than the largest product to be coated. Lighting and how product will move through the booth are also considerations when designing painting and coating operations.

Exhaust Filtration:

 

All dry filter spray booths use replaceable filters to capture overspray produced by the spray application. Filter modules are usually configured in one of two ways:

-Pads, which are suited for operations where the overspray is concentrated in less than 50% of filter area;

and

-Bulk media, a better choice when overspray is distributed across the majority of the filter surface.

In some applications, especially high-production industrial situations, water is used as the filtering medium. In these systems, a recirculation system continually cycles specially compounded water through a series of sluices and baffles to create a water curtain to capture overspray.

 

 

 

 

Exhaust Chamber:

In some booths, the exhaust chamber appears as a plenum behind the exhaust filtration and is often the same width and height as the working depth. In this configuration, the exhaust air moves parallel to the floor as it enters the exhaust filters. In booths using downdraft airflow, the exhaust plenum is actually the "pit", drawing overspray air down through filters and then through channels underground to be recycled. These exhaust systems include fans of sufficient power to move air through the system. The exhaust fan is mounted in the exhaust stack.

In water wash systems, the wash chamber is equivalent to the air exhaust chamber in dry filter booths. Pumping systems with enough force to move the water take the place of exhaust fans. Intake air moving across the painting operation conveys the overspray into the water curtain and the water wash apparatus, which then works to move the water in such a way as to trap and separate the particulate from the recycling water.

 

 

1.1.4.c Booth Components

 

In addition, some spray booth systems also have an intake plenum

 

Intake Plenum

 

The intake plenum is the point at which air is brought into the booth. The plenum may be vertical and found at one end of the booth, or horizontal, using part or all of the ceiling inside the booth as an aperature. Air entering the booth through the plenum may flow parallel the floor, or it may flow down toward the floor from an overhead plenum on the top of the chamber.

 

Intake Filtration

 

Dust, dirt and other airborne particles in the "supply" air are a major cause of contaminated paint jobs, so a bank of filters traps these particles before they enter the booth's air stream.

 

   

1.1.4.d Booth Components

 

Some booths require air make-up:

 

During paint spray operations the spray booth's exhaust system is removing significant quantities of shop or plant air. A typical 10' x 8' x 6' spray booth exhausts more than 8,000 cubic feet of air per minute. If replacement air is pulled directly from outside, this volume may be sufficient to cool the interior of the building and may adversely affect the quality of coatings. An air replacement system may be required, using an air make-up unit which supplies conditioned and filtered air to the booth, minimizing temperature variations and removing particulates that compromise finish quality.

1.1.4.e Booth Components

 

Accessories which are often required:

 

 

Exhaust duct and stack

 

-with attached connecting rings, elbows, access doors and related accessories

 

Roof flange

 

-for flat or pitched roofs.

 

Stackhead

 

-with automatic dampers. Prevents rain, snow and drafts from entering the spray booth.

 

Sound management

Lights:

 

-inside / outside access fluorescent or explosion-proof incandescent.

 

Motor starter and controls:

 

-fusible disconnect switches, motor starters, associated controls and energy-saving devices

 

Manometer:

 

-monitors air pressure drop across the exhaust filters and provides a visual indication of when the filters should be replaced.

Automatic safety shut-down systems:

-automatically interrupts the compressed air to the spray equipment when the accumulation of overspray in the arresting filters exceeds a preset limit.

Dry chemical fire suppression system:

 

-pre-engineered packages specifically for spray booths. Fire suppression systems may require electrical service and compressed air.

 

 

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