The main use of this test is to indicate trends, and signal changes, in fluid viscosity during the drilling operation.Funnel viscosity values are dependent both on fluid type and temperature, therefore, results should not be compared between different operations.
Equipment
Marsh Funnel and receiving jug with the one quart level clearly marked.
Reporting
Report in Seconds per quart to the nearest whole second.
Sources of Error
Always check orifice for obstructions.
Calibrate with water, should be 26 +/- 0.5 seconds.