Sierra InnovaMass 240i Series, Инструкция по эксплуатации, Страница: 18 / 115

18
Hot Tap Guidelines
Hot tapping must be performed by a trained professional. U.S. 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.
All flow meter connections, isolation valves, and fittings for hot tapping
must have the same or higher pressure and temperature rating as the main
pipeline.
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-inch mounting adapter on the pipe. Make sure the mounting adapter
is within ± 5° perpendicular to the pipe centerline (See previous page under
“Isolation Valve Selection”). 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 pages 17-19.