DigitalFlow™ GC868 Startup Guide (1 and 2-Channel)
1-8
Chapter 1. Installation
Figure 1-2: Desired Projection of Acoustical Signal Path
Finding a location where the pipe is concentric is important for optimum accuracy
and performance. If possible, perform a pipe survey with an ultrasonic thickness
gage to find the best location.
2.
Clear rust or loose paint and measure the wall thickness at five points along the
pipe axis at 25 mm (1-in.) intervals using an ultrasonic thickness gage, as shown
in Figure 1-3 below. Check each point three times and record the mean values. If
the maximum variation between the five points exceeds 0.25 mm (0.010 in.), find
another location.
Figure 1-3: Measuring Thickness Along the Pipe Axis
3.
Measure the outside diameter (OD) of the pipe using a tape measure or the
supplied layout wrap. Using the entire layout wrap, mark two circumferential
lines along the edges of the wrap, as shown in Figure 1-4 below.
Figure 1-4: Measuring and Marking Circumference Lines
4.
Now measure the OD and the wall thickness at eight points along the pipe
circumference at 45° intervals (shown in Figure 1-5 below), three times per point,
and record the mean values.
Pipe
Transducer
Signal Path
Transducer
End View
1" (25mm)
1" (25mm)
1" (25mm)
1" (25mm)
