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Series 220/221 Instruction Manual Chapter 2 Installation
7. Tighten the packing gland nuts to stop leakage around the stem. Do not
torque over 20 ft-lbs.
8. Slide the stem clamp back into position. Torque stem clamp bolts to 15
ft-lbs. Replace the stem clamp nuts and torque to 10-15 ft-lbs.
9. Attach the safety chain from the stem clamp to the hook on the enclosure
adapter at the nearest link. To separate the insertion tool from the flow
meter, remove four socket head cap bolts securing the upper and lower re-
tractor brackets. Remove the insertion tool.
Installation of Meters with Packing Gland Connection (No Insertion Tool)*
Use the following formula to determine insertion depth for meters with a
packing gland connection (NPT and flanged) without an insertion tool.
Insertion Length Formula
I = S – F – R – t
Where:
I = Insertion length.
S = Stem length – the distance from the center
of the sensor head to the base of the enclo-
sure adapter (S = 29.47 inches for standard
probes; S = 41.47 inches for 12 inch ex-
tended probes).
F = Distance from the raised face of the flange
or top of NPT stem housing to the outside
of the pipe wall.
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 2-11. Insertion Calculation (Meters without Insertion Tool)
Example:
To install a Series 221 Flow Meter with a standard probe (S = 29.47) into a
14 inch schedule 40 pipe, the following measurements are taken:
F = 3 inches
R = 5 inches
t = 0.438 inches
The example insertion length is 21.03 inches.
*All dimensions are in inches.
IM-22 2-15