Baker Hughes Panametrics PanaFlow LC, User Manual

Page: 94 / 146

Figure 109 below shows an odd traverse installation without
the transducers. Proceed to the section on mounting the
transducers later in this chapter.
Figure 109: A odd traverse GCF installation without transducers
B.3 Using the magnetic clamping
fixture - MCF
The Magnetic Clamping Fixture (MCF) is used to fasten
transducers to the pipe at the proper spacing without
chains or straps. Different fixtures are used for the odd
traverse and even number of-traverse methods. Each type
of MCF has magnets located in the two blocks at the ends
of the fixture. When the magnets are turned ON, the fixture is
magnetically clamped to the pipe wall.
WARNING!
Do not use the MCF at temperatures that
exceed 120°F (49°C) - the fixture will fall off
the pipe.
The transducer installation consists of mounting the MCF to
the pipe and then mounting the transducers into the fixture.
To properly mount the MCF, you should first become familiar
with the components of the fixture (see Figure 110 below).
Then, refer to the appropriate section for instructions on
either the even traverse or odd number of-traverse method.
Figure 110: MCF transducer block and magnetic block
B.3.1 Even traverse method
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 installations with more than
two traverses, contact Panametrics for assistance.
The even-traverse MCF consists of a fixed magnetic block
and an adjustable magnetic block, which are connected
by two rods (one of the rods acts as a scale to help you
properly space the transducers). In addition, a fixed
transducer block and an adjustable transducer block are
included. To install the MCF in a even-traverse configuration,
complete the following steps:
1. 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 of straight,
undisturbed flow downstream from the measurement
point.
2. 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 remove any high spots. However,
be careful to preserve the original curvature of the pipe.
3. Obtain the transducer spacing dimension (S) after
programming the XMT1000 transmitter. Using the ruler
on the MCF rod as a guide, loosen the red thumbscrews
and move the transducer blocks so that the distance
between them equals the S dimension. Then, tighten the
thumbscrews. Use the pressure bolts or the edges of the
blocks as reference points, as shown below.
IMPORTANT:
Make sure there is at least 4” (100 mm) of clearance
between the fixed magnetic block and the nearest
transducer block.
82