Cold Tap Guidelines - GE PanaFlow MV80 User Manual

Chapter 2. Installation
2.3.1c

Cold Tap Guidelines

Refer to a standard code for all pipe tapping operations. The following tapping instructions are general in nature and
intended for guideline purposes only. Proceed as follows:
CAUTION!
hours at full gas flow before installing the flowmeter.
1. Turn off the flow of process gas, liquid or steam. Verify that the line is not pressurized.
2. Confirm that the installation site meets the minimum upstream and downstream pipe diameter requirements.
See Figure 4 on page 10.
3. Use a cutting torch or sharp cutting tool to tap into the pipe. The pipe opening must be at least 1.875 inches in
diameter. (Do not attempt to insert the sensor probe through a smaller hole.)
4. Remove all burrs from the tap. Rough edges may cause flow profile distortions that could affect flowmeter
accuracy. Also, obstructions could damage the sensor assembly when inserting into the pipe.
WARNING!
same or higher pressure rating as the main pipeline.
5. After cutting, measure the thickness of the cut-out and record this number for calculating the insertion depth.
6. Weld the flowmeter pipe connection on the pipe. Make sure this connection is within ± 5° perpendicular to the
pipe centerline (see Figure 9 below).
7. Install the isolation valve (if used).
8. When welding is complete and all fittings are installed, close the isolation valve or cap the line. Run a static
pressure check on the welds. If pressure loss or leaks are detected, repair the joint and retest.
9. Connect the meter to the pipe process connection.
10. Calculate the sensor probe insertion depth and insert the sensor probe into the pipe as described on the
following pages.
16
When using toxic or corrosive gases, purge the line with inert gas for a minimum of four
All flowmeter connections, isolation valves and fittings for cold tapping must have the
Correct Alignment
Figure 9: Connection Alignment
Incorrect Alignment
PanaFlow™ MV80 & MV82 User's Manual