ADS Environmental Services PrimeProbe2 QR 775016 A0 - Manual (Page 16)

PrimeProbe2 User Manual
12
Measuring the Internal Diameter of the Pipe
After successfully attaching the 1-inch (25-mm) boss to the pipe, it is
critical to take an accurate measurement of the internal diameter of the
pipe (pipe ID). This can be done using one of the following:
 Pipe thickness gauge
 Tape measure
 Gauging rod
Pipe Thickness Gauge
Use an Ultrasonic Pipe Thickness Gauge to measure the ID of the pipe in
the following way:
1. Measure the circumference of the pipe using a measuring tape.
2. Divide the measured circumference by
ð (pi) to obtain the outside
diameter of the pipe.
3. Use the ultrasonic pipe thickness gauge to measure the thickness of
the pipe wall.
4. Multiply the pipe thickness by 2 and subtract the result from the
outside diameter.
Gauging Rod
Use a gauging rod to measure the pipe ID in the following way:
1. With the valve closed, connect the gauging rod to the ball valve.
Make sure the measuring arm is aligned correctly with the pipe
(see step 1 in the following figure).
2. Open the valve completely, and lower the gauging rod until it
touches the bottom of the pipe. With the gauging rod touching the
bottom of the pipe, rotate the gauging rod 180 degrees and then
lock-down the upper measuring-lip (see step 2).
3. Withdraw the gauging rod until it touches the top of the pipe wall.
With the gauging rod touching the top of the pipe wall, lock-down
the lower measuring lip. The distance between the two knife-edges
of the measuring lips is the internal diameter of the pipe (see step
3).
4. Rotate the gauging rod 180-degrees, and withdraw the gauging rod
the rest of the distance (i.e., clearing the valve). Close the ball
valve completely. Remove the gauging rod (see step 4).