Given:

Oil gravity = 40°API, 0.875 S.G.

Oil flow rate = 2,000 bpd

Inlet oil temperature = 90°F

Water S.G. = 1.04

Inlet BS&W = 10%

Outlet BS&W =1%

Solution:

1. **Settling Equation.** Investigate treating at 90°F, 100°F, 120°F.

2. **Retention Time.** Plot computations of d and h with retention times less than 20 minutes.

d2 h = (20) (2,000)70.12 = 333,333

The shaded area of Figure 6-14 represents combinations of d and h with t_{r} less than 20 minutes.

3. **Heat Required**

4. **Selection.** Choose any combination of d and h that is not in the shaded area. Read the corresponding treating temperature.

Example solutions are:

An economical solution would be a 60-inch-diameter treater with a 100-inch-high coalescing section and a 0.16-MMBtu/h firetube capacity. In actual service, crude may not require heating at all. The firetube capacity will allow a treating temperature of 100°F if required by field conditions.