Panametrics PanaFlow MV80, User Manual, Page: 29 / 184

PanaFlow™ MV80, MV82 & MV84 User’s Manual 17
Chapter 2. Installation
2.2.3 Installing Flange-Style Flow Meters (cont.)
To install the meter, complete the following steps:
1. Turn off the flow of process gas, liquid, or steam. Verify that the line is not pressurized. Confirm that the
installation site meets the required minimum upstream and downstream pipe diameters.
2. Seat the meter level and square on the mating connections with the flange stamped with a flow arrow on the
upstream side, with the arrow head pointing in the direction of flow. Position a gasket in place for each side. Make
sure both gaskets are smooth and even with no gasket material extending into the flow profile. Obstructions in
the pipeline will disturb the flow and cause inaccurate measurements.
3. Install bolts in both process connections. Tighten the nuts in the sequence shown in Figure 9 on page 13 . Check
for leaks after tightening the flange bolts.
2.3 Series MV82 Insertion Flow Meter Installation
2.3.1 General Installation Guidelines
Prepare the pipeline for installation using either a cold tap or hot tap method described in this section. 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 in the following sub-sections.
2.3.1.1 Electronics Enclosure Clearance
Allow clearance between the electronics enclosure top and any obstruction when the meter is fully retracted.
2.3.1.2 Isolation Valve Selection
An isolation valve is available as an option with Series MV82 meters. If you supply the isolation valve, refer to Figure 12
below and verify that it meets the following requirements:
1. A minimum valve bore diameter of 1.875 inches is required, and the valve’s body size should be two inches.
Normally, gate valves are used.
2. Verify that the valve’s body and flange rating are within the flow meter’s maximum operating pressure and
temperature.
3. Choose an isolation valve with at least a two inch distance between the flange face and the gate portion of the
valve. This ensures that the flow meter’s sensor head will not interfere with the operation of the isolation valve.
1.875-inch min.
valve bore
2-inch min.
2-inch
valve size
Isolation Valve Requirements
Figure 12: Isolation Valve Dimensions
2.3.1.3 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 purposes only. Proceed as follows:
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.
1. Turn off the flow of process gas, liquid, or steam. Verify that the line is not pressurized.