Reference Manual
00809-0100-4792, Rev CA
August 2010
Rosemount 1495, 1496
3-6
Step 4: Install the Orifice
Plate
General installation instructions to install (or remove) the orifice plate are as
follows:
1.
Make certain the pipeline is not under pressure and has been drained
or purged.
2.
Loosen all studs and nuts.
3.
Remove the studs in one half of the flange union.
4.
Spread flange union by turning jackscrews clockwise.
5.
Install new plate or remove existing plate for replacement or
inspection.
6.
Install new gaskets when installing plate. It is recommended to install
new gaskets each time orifice flange union is separated.
7.
Release the flange union by turning Jackscrews counter clockwise.
8.
Replace studs.
9.
Tighten studs in a star pattern. See “Bolt Torque Recommendations”
on page B-12.
NOTE
Refer to published standards (AGA3, ASME MFC-3M, ISO 5167 for
installation guidelines.
Once the orifice plate is installed, proceed by installing connection systems,
manifolds, and/or transmitters per manufacturer’s recommended
specifications and plant standards.
NOTE
Universal style orifice plates are designed for installation into junior or senior
orifice fittings as well as into RTJ Plate Holders.
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