**Problem 1.** A restrictor is required to flow 0.1 GPM of 50/50 ethylene glycol/water blend (specific gravity = 1.07) at 45°F and 6 psid. How many Lohms are required?

**Solution:**

- Read kinematic viscosity; v = 5.0 cs from curve on pages S53-54.
- Use v and ΔP to determine viscosity correction factor, V = .87, from curve on page S7.
- Select unit constant K from table on page S6.
- Compute Lohms required.

**Problem 2.** What pressure drop will result from a flow of 57 mL/min. of 50/50 ethylene glycol/water mixture (specific gravity = 1.07) at 45°F, flowing through a 1000 Lohm restrictor?

**Solution:**

- Find viscosity from pages S53-54. v = 5 cs
- Use knowledge of system to assume initial solution.

H = 4 psid - Use assumed H to determine V = 0.75 from table on page S7.
- Select units constant K from table on page S6.
- Compute trial ΔP

- Make trials as required to find correct solution.

H = 2 psid V = .55

**Problem 3**. What restriction will permit a flow of 1 gallon of water per hour at 50 psi ΔP?

**Problem 4.** A jet with a hole diameter of .012" flows 18 lb/hr of water at 100 psi ΔP. How many Lohms?

**Problem 5. **What ΔP will be required to flow 20 GPH of water through a 2000 Lohm Jet?

**Problem 6.** What water flow will result from a restriction of 500 Lohms and a ΔP of 500 psi?

Note: For special flow requirements, The Lee Company can determine the required Lohm rating.

**Problem 7.** A restrictor is required to flow 0.15 GPM of MIL-H-83282 hydraulic fluid at 80°F and 100 psi ΔP. What restriction is required?

**Solution:**

- Read specific gravity; S = 0.84 from chart on page M17.
- Read viscosity; v = 21cs. From chart on page M14.
- Use viscosity and ΔP to determine viscosity compensation factor V = 0.95 from graph on page M13.
- Select units constant, K = 20 from table on page M10.

**Problem 8.** What pressure drop will result from a flow of 5 PPH of SAE #10 lubricating oil at 20°F, flowing through a 1000 Lohm restrictor?

**Solution:**

- Read specific gravity and viscosity.

S = 0.90, v = 600cs. - Use knowledge of system to assume solution.

H = 50 psid. - Use assumed ΔP to determine V = 0.18
- Select units constant, K = 10,000 from table on page M10
- Compute trial ΔP.

- Make trials as required to find correct solution.

H = 26 psid.

**Problem 9.** A Safety Screen is required to flow 775 lb/hr of JP4 @ 80°F with a maximum pressure drop of 5 psid. What is the maximum Lohm rate allowed for the Safety Screen?

**Solution:**

- Find specific gravity; S = 0.77 from curve on page M16.
- Find viscosity; v = 1cs from curve on page M14.
- Use v and ΔP to determine viscosity compensation factor, V = 1.0 from curve on page M13.
- Select units constant, K = 10,000 from table on page M10.