Hydraulic Horse Power is a measure of the energy per unit of time that is being expended across the bit nozzles. It is commonly calculated with the equation HHP=P*Q/1714, where P stands for pressure in pounds per square in., Q stands for flow rate in gallons per minute, and 1714 is a conversion factor necessary to yield HHP in terms of horsepower. Bit manufacturers often recommend that fluid hydraulics energy across the bit nozzles be in a particular HHP range, for example 2.0 to 7.0 HHP, to ensure adequate bit tooth and bottom-of-hole cleaning (the minimum HHP) and to avoid premature erosion of the bit itself (the maximum HHP).
Ref: http://www.glossary.oilfield.slb.com
Hydraulic Horse Power (HPP) formula as follow:
HHP= (P x Q) ÷1714
where HHP = hydraulic horsepower
P = circulating pressure, psi
Q = circulating rate, gpm
Example : Determine Hydraulic Horse Power with these following data:
circulating pressure = 3500 psi
circulating rate = 800 gpm
HHP= (3500 x 800) ÷1714
HHP = 1633.6
Please find the Excel sheet for calculating Hydraulic Horse Power (HHP)
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