The Lohm has been selected so that a 1 Lohm restriction will permit a flow of 100 gallons per minute of water with a pressure drop of 25 psi at a temperature of 80°F.
I = Flow rate (gallons per minute)
H = Differential pressure (psi)
L = Lohm rate, a measure of resistance to liquid flow. It includes all density, viscosity, Reynolds number, coefficient of discharge and area units (Lohms)
Problem 1. What restriction will permit a flow of 1 gallon of water per hour at 50 psi ∆P?
I = 1/60 = 0.0167 GPM
Problem 2. A jet with an approximate hole diameter of 0.012 of an inch flows 18 lb/hr of water at 100 psi ∆P. What is the restriction?
Problem 3. What ∆P will be required to flow 20 GPH of water through a 2000 Lohm Jet?
Problem 4. What water flow will result from a restriction of 500 Lohms and a ∆P of 500 psi?
For special flow requirements, contact your local Lee Sales Engineer to determine the required Lohm rating.