ONICON F-2600 - Manual (Page 28)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page 28
2.4.1 Installing Flow Meters with a Packing Gland Connection*
Use the formula below to determine the insertion depth for flow meters (NPT and flanged)
equipped with an insertion tool. To install, see the next page for instructions for meters
with a permanent insertion tool. For meters with a removable insertion tool, see page 33.
Insertion Length Formula
I = F + R + t – 1.35
Where:
I = Insertion length.
F = Distance from the raised face of the flange or top of
the process connection for NPT style meters to the
top outside of the process pipe.
R = Pipe inside diameter ÷ 2 for pipes ten" & smaller.
R = Five" for pipe diameters larger than ten".
t = Thickness of the pipe wall. (Measure the disk
cutout from the tapping procedure or check a piping
handbook for thickness.)
Figure 10. Insertion Calculation (Meters with Insertion Tool)
Example 1: Flange Style Meters:
To install an insertion style flow meter into a 14" schedule 40 pipe, the following
measurements are taken:
F = 12"
R = 5"
t = 0.438"
The example insertion length is 16.09".
Example 2: NPT Style Meters:
The length of thread engagement on the NPT style meters is also subtracted in the equation.
The length of the threaded portion of the NPT meter is 1.18". Measure the thread portion
still showing after the installation and subtract that amount from 1.18". This gives you the
thread engagement length. If this cannot be measured use .55" for this amount.
F = 12"
R = 5"
t = 0.438"
The example insertion length is 15.54".
*All dimensions are in inches.
I
F
R
t