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Chapter 2 Installation Series 220/221 Instruction Manual
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 re-
movable insertion tool, see page 2-14.
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 out-
side of the process pipe.
R = Pipe inside diameter ÷ 2 for pipes ten inches & smaller.
R = Five inches for pipe diameters larger than ten inches.
t = Thickness of the pipe wall. (Measure the disk cut-out
from the tapping procedure or check a piping handbook
for thickness.)
Figure 2-8. Insertion Calculation (Meters with Insertion Tool)
Example 1: Flange Style Meters:
To install a Series 221 Flow Meter into a 14 inch schedule 40 pipe, the fol-
lowing measurements are taken:
F = 12 inches
R = 5 inches
t = 0.438 inches
The example insertion length is 16.09 inches.
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
inches. Measure the thread portion still showing after the installation and
subtract that amount from 1.18 inches. This gives you the thread engagement
length. If this cannot be measured use .55 inch for this amount.
F = 12 inches
R = 5 inches
t = 0.438 inches
The example insertion length is 15.54 inches.
*All dimensions are in inches.
2-12 IM-22