22
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit
armstrong
international.com for up-to-date information.
Installation Overview – continued
Hot 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. Confirm that the installation site meets the minimum upstream and downstream pipe diameter requirements.
2. Weld a two inch mounting adapter on the pipe. Make sure the mounting adapter is within ± 5° perpendicular to the
pipe centerline (see previous page). The pipe opening must be at least 1.875 inches in diameter.
3. Connect a two inch process connection on the mounting adapter.
4. Connect an isolation valve on the process connection. The valve’s full open bore must be at least 1.875 inches in
diameter.
5. Run a static pressure check on the welds. If pressure loss or leaks are detected, repair the joint and re-test.
6. Connect the hot tapping equipment to the isolation valve, open the isolation valve and drill at least a 1.875 inch
diameter hole.
7. Retract the drill, close the isolation valve, and remove the hot tapping equipment.
8. Connect the flow meter to the isolation valve and open the isolation valve.
9. Calculate the sensor probe insertion depth and insert the sensor probe into the pipe as described on the following
pages.
Warning!
Hot tapping must be performed by a trained professional. US. regulations often require a hot tap permit.
The manufacturer of the hot tap equipment and/or the contractor performing the hot tap is responsible for
providing proof of such a permit.
Warning!
All flow meter connections, isolation valves, and fittings for hot tapping must have the same or higher
pressure rating as the main pipeline.
Figure 2-5. Hot Tap Sequence
