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Chapter 2 Installation Series 220/221 Instruction Manual
Hot Tap Guidelines
Warning!
Hot tapping must be
performed by a trained
professional. US. regula-
tions often require a hot
tap permit. The manufac-
turer 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 tap-
ping 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.
Warning!
All flow meter connec-
tions, isolation valves and
fittings for hot tapping
must have the same or
higher pressure rating as
the main pipeline.
5. Hot tap the pipe.
6. Close the isolation valve. Run a static pressure check on the welds. If
pressure loss or leaks are detected, repair the joint and re-test.
7. Connect the flow meter to the isolation valve.
8. Calculate the sensor probe insertion depth as described on the following
pages. Insert the sensor probe assembly into the pipe.
Check upstream and
downstream piping
requirements
Weld mounting
adapter
Connect process
connection
(flange or NPT)
Connect
isolation valve
Test for leaks,
purge pipe
Hot tap pipe
Connect meter to
valve, calculate
insertion depth,
install flow meter
FLOW
Figure 2-5. Hot Tap Sequence
2-8 IM-22