Chapter Five

Engineering Calculations

5.0 Bit Nozzle Selection—Optimized Hydraulics

These series of formulas will determine the correct jet sizes when optimizing for jet impact or hydraulic horsepower and optimum flow rate for two or three nozzles.

1. Nozzle area, sq. in.:

image (5.1)

2. Bit nozzle pressure loss, psi (Pb):

image (5.2)

3. Total pressure losses except bit nozzle pressure loss, psi (Pc):

image (5.3)

4. Determine slope of line M:

(5.4)

5. Optimum pressure ...

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