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 incorporate a short straightening device in the entrance section of the
meter. Such meters usually have from 4 to 8 evenly spaced radial vanes just
before the meter itself.
4.3 Effect on Installation. Since flow profiles in a pipe are not constant,
meters must be correctly positioned during installation. Positioning is
specific for each meter and is available from the meter manufacturer.
(a)
(b)
GRID DEVICE
PIPE-FILLED DEVICE
FIGURE 3-2.
Cross-Sections of Flow Straightening Devices
3-4
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