IM-P198-05 MI Issue 216
3.6 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.
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 flowmeter connections, isolation valves, and fittings for hot tapping must
have the same or higher pressure rating as the main pipeline.
1. Confirm that the installation site meets the minimum upstream and downstream pipe
diameter requirements.
2. Weld a two" 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 47.625 mm (1.875") in diameter.
3. Connect a two" 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 47.625 mm (1.875") 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 47.625 mm (1.875") diameter hole.
7. Retract the drill, close the isolation valve, and remove the hot tapping equipment.
8. The first time the sensor is installed, install the check-disc tool on the flowmeter rather
than the rotor.
9. Open the isolation valve and insert the check-disc tool. After successful insertion, retract
the sensor, close the isolation valve and remove the flowmeter.
10. Install the rotor, connect the flowmeter to the isolation valve and open the isolation valve.
11. Calculate the sensor probe insertion depth and insert the sensor probe into the pipe as
described on the following pages.
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