ONICON F-2600 - Manual (Page 26)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page 26
2.3.2 Hot Tap Guidelines
!
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.
Refer to a standard code for all pipe tapping operations. The following tapping instructions
are general in nature and intended as a guideline only.
1. Confirm that the installation site meets the minimum upstream and downstream pipe
diameter requirements.
2. Weld a 2" 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" in diameter.
3. Connect a 2" 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" 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" 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
All flow meter connections, isolation valves, and fittings for hot tapping must have the same or
higher pressure rating as the main pipeline.
FLOW
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Check upstream and downstream
piping requirements
Weld mounting adapter
Connect process connection
(flange or NPT)
Connect isolation valve and
test for leaks
Hot tap pipe
Purge pipe
Connect meter to valve, calculate
insertion depth, install flow meter
Figure 9. Hot Tap Sequence