Chapter 4: Spray Application Working Pressure
The appropriate working pressure is a key factor in the proper application of paint to any surface. Too little pressure will result in an uneven spray pattern. Too much pressure causes excessive overspray and premature tip wear.
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Best Practices
Minimum Spray Pressure
To achieve the best results, manufacturers prescribe a specific minimum spray pressure for the application of their products. Maintain the appropriate working pressure (at the tip) based upon the manufacturer’s recommendation. Many production wall finishes require a minimum of 2200 psi for proper atomization. “Working pressure” can cause several application headaches.
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Working Pressure Application Headache
Greater Paint Consumption
High pressure spraying can increase paint consumption from 10% to 30% or more, depending upon environmental conditions.
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Working Pressure Application Headache
Uneven Distribution of Applied Coating
Low pressure will have a poor fan pattern, fingering along the edges, material spitting, clogging, and striping, preventing uniform application.
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Working Pressure Application Headache
Slower Production
To compensate for poor atomization due to low pressure, multiple spray passes are often required to achieve sufficient film builds. In an attempt to smooth out material build, additional time and effort are expended backrolling.
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Working Pressure Application Headache
Poor Material Transfer
When a poor spray pattern occurs, the common reaction is to increase the spray distance, which compounds the problem of overconsumption. Higher than necessary spray pressure will result in significant overspray.
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Working Pressure Application Headache
Increased Pump Wear and Maintenance
High pressure forces the pump to work harder to compensate. As the packings wear parts prematurely, pressure drops even further. Once the tips begin to deteriorate, the pressure must be increased in order to properly atomize the paint through the tip orifice.
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