Ditch Witch MR90 - Manual (Page 67)

Systems and Equipment - 66
MR90 Operator’s Manual
Drilling Fluid Measurements
CMW
®
Mud Weight
The density of a given liquid is the mud weight.
To determine mud weight, you will need the mud balance and scale in your drilling fluid test kit (p/n 191-
158), available from your Ditch Witch
®
dealer.
1. Place mud balance base on level surface.
2. Fill the cup to the top with mud sample to be weighed. See “Fluid sample valve” on page 31.
3. Secure the lid on the cup.
4. Cover the hole in the cap with a finger and wash all mud from outside of the cup.
5. Place balance on the scale and slide rider along the arm until the level bubble indicates the scale is
level. The mud weight of the drilling fluid is the number indicated by the scale.
6. Thoroughly rinse mud weight cup and scale.
Sand Content
Sand content is measured by determining the volume percent of sand-sized particles present in the drilling
fluid.
To determine sand content, you will need the sand content tube, wash bottle, screen, and funnel in your
drilling fluid test kit.
1. Fill sand content tube to the indicated mark with mud sample. See “Fluid sample valve” on page 31.
2. Use wash bottle to add water to the next mark.
3. Close tube and shake vigorously.
4. Pour mixture onto clean screen. Discard liquid passing through the screen.
5. Repeat steps 2-4 until all drilling fluid has been washed out of the tube.
6. Place funnel upside down over top of screen.
7. Slowly invert the assembly and insert the tip of the funnel into the mouth of the measuring tube.
8. Wash sand into measuring tube with wash bottle and allow sand to settle. The volume percent of sand
is measured using the scale on the side of the measuring tube.
9. Thoroughly rinse all components of the sand content kit.
IMPORTANT: Make sure all pieces of mud weight kit are clean and free of obstruction before measuring
drilling fluid.
IMPORTANT: Mud should be expelled through the hole in the lid to ensure cup is full and any trapped air
is freed from the cup.
IMPORTANT: Make sure sand content kit components are clean and free of obstruction before
measuring drilling fluid.