Chapter 2 Installation | Series |
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Warning! Hot tapping must be performed by a trained pro- fessional. US. regulations of- ten require a hot tap permit. The manufacturer of the hot tap equipment and/or the con- tractor 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 rat- ing as the main pipeline.
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 pur- poses 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 mount- ing adapter is within ± 5° perpendicular to the pipe centerline (see previous page). The pipe opening must be at least 1.875 inches in di- ameter.
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.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
7.Connect the flow meter to the isolation valve.
8.Calculate the sensor probe insertion depth as described on the follow- ing 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 | |
| Hot tap pipe | |
FLOW | Test for leaks, | |
purge pipe | ||
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| Connect meter to | |
| valve, calculate | |
| insertion depth, | |
| install flow meter |
