For liquid flow through an orifice the Lohms Laws are:

For liquid flow through an orifice:
Liquid flow equation


(Corrected April 15, 1999) Step 1: Enter Specific Gravity of fluid (water = 1.00) here:

Note: Viscosity effects are not yet considered in this calculation.

Step 2: Select Pressure Unit:
Step 3: Select flow Unit:
Step 4: From this chart the units factor (K) is

Step 5:

Enter data into the input area of one of the scenarios below. Click outside of the input area and the results will appear in the answer area.

A. If you know the pressure and flow and need to find Lohms:

Inputs:

Upstream pressure:
Downstream pressure:
Flowrate:

Answer:

Lohms =

B. If you know pressure and Lohms and need to find flow:

Inputs:

Upstream pressure:
Downstream pressure:
Lohms:  

Answer:

Flowrate =
 

C. If you know Lohms and Flow and need to find Upstream pressure:

Inputs:

Lohms:  
Downstream pressure:
Flowrate:

Answer:

Upstream Pressure =
 




Always verify flow calculations by experiment. The Lee Company expects the users of this calculator to be responsible for proper design and fabrication of their systems.