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September 2004
Measuring P and L (cont.)
B-2
Use Figure B-2 below to properly measure the pipe coupling length.
Typically, the transducer face is positioned just outside the inside
diameter (ID) of the pipe, or slightly retracted inside the coupling.
Figure B-2: Determining the Pipe Coupling Length
Then, use the following formula to determine the P dimension:
[
ID
P
=
---------------------------------- -
For example, if:
•
inside diameter (ID) = 48"
•
wall thickness (WT) = 3/8"
•
installed coupling length (CL) = 2.0"
•
transducer face depth (FD) = 1.75"
•
mounting angle (MA) = 45°
Then, the P dimension would be:
[
(
48
+
2 0.375
P
=
--------------------------------------
(
cos
FD
o
MA
45
CL
(
)
]
+
2 WT
(
+
2 CL FD
–
(
)
cos
MA
)
]
(
)
+
2 2.0 1.75
–
)
45°
Measuring P and L Dimensions
)
=
69.4"
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