Sierra INNOVA-MASS 240-VT, Инструкция по эксплуатации, Страница: 31 / 146

Chapter 2 Installation Sierra 240/241Series Instruction Manual
2-16 IM-240
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. To separate the insertion tool from the flow meter, remove four socket
head cap bolts securing the upper and lower retractor 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 cen-
ter 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 extended
probes).
F = Distance from the raised face of the
flange or top of NPT stem housing to the out-
side of the pipe wall.
R = Pipe inside diameter

2 for pipes ten
inches & smaller.
R = Five inches for pipe diameters larger than ten inch-
es.
t = Thickness of the pipe wall. (Measure the disk cut-
out from the tapping procedure or check a piping hand-
book for thickness.)
Figure 2-11. Insertion Calculation (Meters without Insertion Tool)
Example:
To install a 241 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.