Ditch Witch MR90 - Manual (Page 66)

MR90 Operator’s Manual
Systems and Equipment - 65
Drilling Fluid Measurements
CMW
®
Drilling Fluid Measurements
Fluid measurements are important in ensuring the drilling system functions correctly. The viscosity, mud
weight, and sand content of drilling fluids must be controlled and can be measured using the drilling fluid
test kit (p/n 191-158), available from your Ditch Witch
®
dealer.
Funnel Viscosity
Viscosity is the measure of internal resistance of a fluid to flow; the greater the resistance, the higher the
viscosity.
To determine viscosity, you will need the Marsh funnel and measuring cup in your drilling fluid test kit.
1. Using wash hose and a clean container, take a fresh
sample of drilling fluid. The sample must be at least
1.5 qt (1.4 L).
2. With finger over bottom of funnel, fill with fluid from
the container through the screen until fluid reaches
the bottom of the screen.
3. Move funnel over 1 qt (.95 L) container.
4. Remove finger from bottom of funnel and use the
stopwatch to count the number of seconds it takes for
1 qt (.95 L) of fluid to pass through the funnel. The
number of seconds is the viscosity.
5. Thoroughly rinse measuring cup and Marsh funnel.
IMPORTANT: Make sure Marsh funnel is clean and free of obstruction and that you have a stopwatch
available for timing the viscosity.