![]() Not only does the size of the nozzle bore effect volume and pressure, but it effects the size of the blast pattern. On top of that, if there are ill-fitting couplings or leaks in the hose, the pressure drop could be total. In addition, pressure will drop with each bend in the hose or change of direction: the shortest, straightest hose configuration is best. Pressure can drop significantly between the compressor and the nozzle, up to one PSI per 50' of hose (1” I.D.). However, if you purchased a #7 (7/16"), still using a 375 compressor and targeting 100 PSI, once it had worn out to the next size up (#8 – 1/2"), you'd still be able to achieve 100 PSI, but you'd sacrifice some productivity earlier in the nozzle's life (compared to a #8 (1/2") nozzle) because the amount of air and abrasive that could pass through the orifice at 100 PSI would be less than what your compressor could supply. ![]() A worn nozzle requires more volume per minute to maintain your target pressure.įor example, If you bought a #8 (1/2") nozzle to get 100 PSI with your 375 CFM compressor, once it has worn out 1/8" diameter to the next nozzle size up (#9 – 5/8"), you'd be lucky to maintain 65 PSI using the same compressor (on the #9 line, the 375 CFM compressor falls between 350 and 400 CFM, so you can only maintain 65 PSI), because the volume of air passing through the enlarged orifice would be inadequate to maintain the pressure. Abrasive passing through the nozzle will wear away the lining, enlarging the orifice. ![]()
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