IM-P198-05 MI Issue 214
3.4 Insertion flowmeter installation
Prepare the pipeline for installation using either a cold tap or hot tap method described on
the following pages. Refer to a standard code for all pipe tapping operations. The following
tapping instructions are general in nature and intended for guideline purposes only. Before
installing the meter, review the mounting position and isolation value requirements given below.
3.4.1 Mounting position
Allow clearance between the electronics enclosure top and any other obstruction when the
meter is fully retracted.
3.4.2 Isolation valve selection
An isolation valve is available as an option with RIM20 flowmeters. If you supply the isolation
valve, it must meet the following requirements:
1. A minimum valve bore diameter of 47.625 mm (1.875") is required, and the valve's body
size should be DN50 (2"). Normally, gate valves are used.
2. Verify that the valve's body and flange rating are within the flowmeter's maximum operating
pressure and temperature.
3. Choose an isolation valve with at least 50 mm (2") existing between the flange face
and the gate portion of the valve. This ensures that the flowmeter's sensor head will not
interfere with the operation of the isolation valve.
Fig. 3 Isolation valve requirements
50 mm (2") minimum
47.625 mm (1.875") minimum valve bore
DN50 (2") valve size
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