Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit
armstrong
international.com for up-to-date information.
21
Installation Overview – continued
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.
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 2-1.
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 flow meter accuracy.
Also, obstructions could damage the sensor assembly when inserting into the pipe.
5. After cutting, measure the thickness of the cut-out and record this number for calculating the insertion depth.
6. Weld the flow meter pipe connection on the pipe. Make sure this connection is within
± 5° perpendicular to the pipe centerline.
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.
Caution!
When using toxic or corrosive gases, purge the line with in-ert gas for a minimum of four hours at full gas
flow before in-stalling the flow meter.
Warning!
All flow meter connec-tions, isolation valves and fittings for cold tap-ping must have the same or higher
pressure rating as the main pipe-line.
