Sierra InnovaMass 240i Series, Instruction Manual, Page: 16 / 115

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2. Seat the meter level and square on the mating connections with the 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 the
image below. Check for leaks after tightening the flange bolts. The required bolt load for
sealing the gasket joint is affected by several application-dependent factors, therefore the
required torque for each application may be different. Refer to the ASME Pressure Vessel
Code guidelines for bolt tightening standards.
241i 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
meter, review the mounting position and isolation value requirements given below.
Mounting Position
Allow clearance between the electronics enclosure top and any other obstruction when the meter
is fully retracted.
Isolation Valve Selection
An isolation valve may be used with 241i meters.
It must meet 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 two
inches existing between the flange face and
1
2
3 4
1
2
3 4
5
6
7
8
1
5
9
3
7
11
2
6
10
4
8
12
4-bolt 8-bolt 12-bolt
1.875-inch min.
v alv e bore
2-inch min.
2-inch
v alv e size
Isolation Valve Requirements