Pressure drop calculator The calculations below must only be used to obtain estimates.The calculations apply orifices, where the diameter > the length of the constriction.A value of 870 kg/m3 has been used for oil density. Separate decimals with a decimal point. Required input is missing! Input Output Flow = lpm Pressure drop = bar Orifice diameter = mm PMC Hydraulics Group AB accepts no liability for the consequences that any errors in formulas and software may have!© PMC Hydraulics Group AB 2019