GE PT878GC Manuel d'utilisateur télécharger pdf (Page 38)

100

101

April 2004

3-6

Performing a Pipe Survey

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 gauge 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 gauge, as shown in Figure 3-4 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 3-4: Measuring Thickness Along the Pipe Axis

3. Measure the outside diameter (OD) of the pipe using a tape

measure or the supplied layout tape. Using the entire layout

tape, mark two circumferential lines along the edges of the

wrap, as shown in Figure 3-5 below.

Figure 3-5: Measuring and Marking Circumference

Lines

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 307 308

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GE PT878GC Manuel d'utilisateur Page 38

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