Series | Chapter 2 Installation |
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Caution! When using toxic or corrosive gases, purge the line with inert gas for a minimum of four hours at full gas flow before installing the flow meter.
Warning!
All flow meter connec- tions, isolation valves and fittings for cold tap- ping must have the same or higher pressure rating as the main pipeline.
Cold 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.Turn off the flow of process gas, liquid or steam. Verify that the line is not pressurized.
2.Confirm that the installation site meets the minimum upstream and downstream pipe diameter requirements. See Figure
3.Use a cutting torch or sharp cutting tool to tap into the pipe. The pipe opening must be at least 1.875 inches in diameter. (Do not attempt to insert the sensor probe through a smaller hole.)
4.Remove all burrs from the tap. Rough edges may cause flow profile distortions that could affect flow meter accuracy. Also, obstructions could damage the sensor assembly when inserting into the pipe.
5.After cutting, measure the thickness of the
6.Weld the flow meter pipe con- nection on the pipe. Make sure this connection is within ± 5° perpendicular to the pipe cen- terline.
7.Install the isolation valve (if used).
8.When welding is complete and all fittings are installed, close the isolation valve or cap the line. Run a static pressure check on the welds. If pressure loss or leaks are detected, repair the joint and re- test.
9.Connect the meter to the pipe process connection.
10.Calculate the sensor probe insertion depth as described on the follow- ing pages. Insert the sensor probe into the pipe.