Nozzle size selection
Nozzles should be selected so that the pressure Inside the psi Is 40-45 psi . The cab operating pressure will be somewhat higher, depending on the type of drill and CFM of psi circulated. Typically, on compressors rated at 65 psi, pressure Inside the bit will be 8-15 psi lower than what the cab gauge shows. On drills with 80-100 psi rated compressors, bit pressures can be 25-50 psi lower than the cab gauge reading. The proper procedure for determining the correct.
Nozzle size Is as follows :
1. Remove the bit and perform an air test. Record all pressure readings. Be sure to use at least one orifice plate in the air test that will give 40-45 psi the tool.
2. Determine what the cab pressure is when the tool pressure is 40-45 psi.
3. Re-install the bit with the original nozzles. Run the air compressor and record the cab air pressure.
4. If you do not get the cab air pressure that you saw with 40-45 psi tool air pressure during the
air test, continue to install and check different sets of nozzles in the bit until you do get the cab
pressure that corresponds to 40-45 psi at the tool.
5. Once you get the same cab air pressure with nozzles that you got during the air test with 40-45
psi tool pressure, you have found the correct size nozzles to use in the bit. The table on the previous page shows approximate bit air pressure that can be expected with the listed nozzles and CFM. This can be used as a starting point for determining correct nozzle size.
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