Sierra INNOVA-MASS 240-VT, Инструкция по эксплуатации, Страница: 21 / 146

Chapter 2 Installation Sierra 240/241Series Instruction Manual
2-6 IM-240
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 ex-
tending 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 se-
quence shown in Figure 2-2. Check for leaks after tightening the flange
bolts.
241 Insertion Flow Meter 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 me-
ter, review the mounting position and isolation value requirements given
below.
Mounting Position
Allow clearance between the electronics enclosure top and any other ob-
struction when the meter is fully retracted.
Isolation Valve Selection
An isolation valve is available as an option with 241 meters. If you supply
the isolation valve, it must meet the following requirements:
1. A minimum valve bore di-
ameter of 1.875 inches is re-
quired, 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 tem-
perature.
3.
Choose an isolation valve with at least two inches existing 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