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5.2c The Double-Traverse Method -UCF
Note: The instructions in this section can also be used for a multiple-traverse method. However, you must use an
EVEN number of traverses. The distance the signal travels from one side of the pipe wall to the opposite side of
the pipe wall is considered one traverse. For more than two traverses, consult the GE factory.
There are three advantages to using the double-traverse method:
•
Accuracy is improved because the signal is in the fluid longer than with a single-traverse.
•
This configuration can reduce some effect of an underdeveloped flow profile.
•
If there is enough pipe length available, the double-traverse fixture is easier to install.
The procedure for mounting the UCF involves setting the transducer spacing and fastening the fixture on the pipe.
Please note you will only need the short block assembly for a double-traverse installation; the long block is not used.
1. Obtain the transducer spacing dimension S, as described in the programming section of the Startup Guide.
2. Be sure the location you have chosen for the installation has at least 10 pipe diameters of straight, undisturbed flow
upstream and 5 pipe diameters downstream of the measurement point.
3. Prepare the pipe where you intend to place the clamping fixture by making sure it is clean and free of loose
material. Sanding, though usually not required, may be necessary to take off any high spots. When sanding, be
careful to preserve the original curvature of the pipe.
4. Using the attached ruler, move the blocks so they are a distance S from each other. Use the pressure bolt or the ends
of the blocks as reference points.
.
8
Centerline
S = Spacing
S = Spacing
S = Spacing
Select one method to set the spacing
Centerline
C-PT Ultrasonic Flow Transducer Installation Guide
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