Aalborg Vortex - Manual (Page 12)

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3.8 Installation Procedure
The Vortex Wafer flow meter is a flangeless style meter. It is installed between
pipe flanges using alignment rings through bolts and gaskets. The inside
diameter of the surrounding pipe should be identical to the I.D. of the meter.
The following installation procedures should be used to insure proper alignment
of the flow meter which in turn will insure accuracy:
A) Check the weldmount mating flanges for internal weld bead. If weld bead
exists in the pipeline, it must be ground flush with the pipe wall. Failure to
do this will result in high percentage errors and erratic outputs.
B) Check the pipe for proper alignment on both sides of the installation
location.
C) Check the overall piping. Be sure it meets or exceeds minimum straight
upstream and downstream requirements, approximately 20 diameter
upstream and 5 diameters downstream.
D) Check for adequate clearance on both sides of the signal processor
housing. A minimum distance of 24 inches is required for ease of wiring
and maintenance.
E) For meters over 150 lb. flange ratings, place the two purchased alignment
rings over the ends of the meter body.
F) Place the flange gaskets between the meter body and the opposing
flanges of the pipeline. Be sure that the arrow on the meter body is
indicating the correct direction of flow.
G) Insert the bolts through the bolt holes in the flanges and run the nuts
onto the bolts. Snug the nuts tight enough to hold the alignment.
H) Check the alignment of the meter body to the pipeline. Check the
concentricity of the gaskets, being sure that they are not protruding into
the flow line. The bolts should bear against the outside of the flange bolt
holes. (See Figure 5, end view of flange, alignment ring and gasket.)