Series Mv80 In-Line Flow Meter Installation; Flange Bolt Specifications - Panametrics PanaFlow MV80 User Manual

2.2

Series MV80 In-Line Flow Meter Installation

Install the Series MV80 In-Line Flow Meter between two conventional pipe flanges as shown in Figure 10 on page 14
and Figure 11 on page 16.
The meter inside diameter is equal to the same size nominal pipe ID in schedule 80. For example, a 2 in. meter has an
ID of 1.939 in. (2 in. schedule 80). Do not install the meter in a pipe with an inside diameter smaller than the inside
diameter of the meter. For schedule 160 and higher pipe, a special meter is required. Consult Panametrics before
purchasing the meter.
Series MV80 Meters require customer-supplied gaskets. When selecting gasket material, make sure that it is
compatible with the process fluid and pressure ratings of the specific installation. Verify that the inside diameter of
the gasket is larger than the inside diameter of the flow meter and adjacent piping. If the gasket material extends
into the flow stream, it will disturb the flow and cause inaccurate measurements.
2.2.1

Flange Bolt Specifications

Stud bolt lengths may be calculated using the following equation:
L = Meter face to face length + 2 (mounting flange thickness + flange raised face) + 2 (gasket thickness) + 4
(mounting nut thickness)
Refer to the mounting flange specification to select the correct stud bolt diameter.
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 and refer to Figure 9 below for the proper bolt tightening sequence.
PanaFlow™ MV80, MV82 & MV84 User's Manual
1
4 3
2
4-bolt
Figure 9: Flange Bolt Torquing Sequence
1
8 5
4 3
6 7
2
8-bolt
1
12 5
8 9
4 3
10 7
6 11
2
12-bolt
Chapter 2. Installation
13