TM 5-3820-256-10
your index finger holding the outlet closed, and pour fresh mud through, and completely up to, the
screen.
(b)
Position the completely empty graduated cup under the outlet and simultaneously start the stop watch
and remove your finger from the outlet. When exactly one quart has drained into the cup, stop the
watch. Log the time, in seconds, required to drain one quart. Clean and dry the cup and funnel after
each use. Be careful not to damage the brass orifice on the bottom of the funnel.
(4)
Sand content test.
(a)
Use the baroid sand content set (200-mesh sieve, funnel, and glass measuring tube) to determine the
percentage of sand by volume. Pour a fresh mud sample into the glass tube to the mark labeled
"Mud to Here." Cover the mouth of the tube with your thumb and shake it vigorously.
(b)
Pour the mud through the screen, discarding the fluid and keeping the sand. Rinse clear water in the
tube and pour through the screen to catch any remaining sand particles.
NOTE
Do not force any solid residue through the sieve. Allow whatever will to accumulate.
(c)
Wash the sand in the screen with a slow stream of clean water. Fit the funnel over the sieve and
slowly turn the funnel over, guiding the funnel's tip into the glass tube. Aim a fine spray of water over
the back side of the sieve to wash sand back into the tube.
(d)
After allowing the sand to settle in the tube, record the quantity of sand in the calibrated tube as the
sand content of the mud in percent by volume. Clean and dry the screen, funnel, and tube after each
use, making sure the sieve is clean and dry.
(5)
Cutting samples.
NOTE
Samples of the cuttings should be taken at intervals dictated by certain drilling conditions, such as a
decrease in time required to drill a foot of hole. Refer to FM 5-166 for more information.
(a)
Use a 6-inch strainer to catch fresh cuttings as they emerge from the drill sleeve.
(b)
Rinse the cuttings in clear water and record their characteristics in the drilling log.
2-83
