GE AquaTrans AT868, Abridged Manual

Page: 65 / 67

September 2004
B-2 Measuring P and L Dimensions
Measuring P and L (cont.)
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:
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:
FD
CL
MA 45
o
P
ID 2 WT
( )
+
[ ]
MA
( )
cos
----------------------------------- 2 CL FD –
( )
+ =
P
48 2 0.375
( )
+
[ ]
45
° ( )
cos
-------------------------------------- 2 2.0 1.75 –
( )
+ 69.4
″
= =