the effect of the particle size distribution on non-newtonian turbulent ...

Chapter 3 Experimental Work
Table 3.II: Pipeline Roughness
Actual Inside Diameter Pipeline Roughness
(mm) (]Lm)
21,6 4
79,0 7
140,7 9
207,0 130
.
3.4.2 Calibration <strong>of</strong> Differential Pressure Transducer
The following procedure is used to calibrate <strong>the</strong> DPT on <strong>the</strong> East and Mini Rig.
Page 3.13
1. The transducer and manometer that are to be calibrated are flushed with mains
water to ensure that air and any solids have been removed from <strong>the</strong> lines.
2. Air over water manometer head ie. a differential head (H) is set up in <strong>the</strong>
glass manometer tubes.
3. . This head is measured and <strong>the</strong> DPT output is logged at <strong>the</strong> same time.
4. Steps 2 and 3 are repeated for different manometer heights over <strong>the</strong> full
differential head test range until enough data points have been collected for
calibration.
A least squares linear regression is performed on <strong>the</strong> measured head and transducer readings
in order to obtain <strong>the</strong> calibration equation. A set <strong>of</strong> N observed measurements Y on <strong>the</strong>
corresponding set <strong>of</strong> N transducer readings X will yield <strong>the</strong> least squares regression line <strong>of</strong>
(Spiegel, 1972)
Y:mX+c
Where
(3.4)