McElroy Pit Bull 26, Руководство оператора

Страница: 27 / 32

Variable Definitions
O.D. = Outside Diameter
t
= Wall Thickness

= 3.1416
SDR = Standard Dimensional Ratio
IFP = Manufacturer’s Recommended Interfacial Pressure
Formulas
O.D.
t = ------------
SDR
AREA = (O.D. - t) x t x

FORCE = AREA x IFP
REQUIRED FORCE = (O.D. - t) × t ×

× IFP + DRAG
Example
Pipe Size = 4" SDR 11
O.D. of Pipe = 4.5"
SDR of Pipe = 11
Recommended Interfacial Pressure = 75 PSI
Using a Model Pit Bull 14 Fusion Unit
O.D. 4.5
t = ------------- = --------------- = 0.409
SDR 11
REQUIRED FORCE = (O.D. - t) × t ×
 × IFP + DRAG
REQUIRED FORCE = (4.5 - .409) × .409 ×

× 75 + DRAG = 394 + DRAG
From Table:
30 ft/lbs of Torque = 330 lbs Force
and 40 ft/lbs of Torque = 435 lbs Force
Interpolating between these two values give approximately 36 ft/ lbs Torque.
FUSION FORCE = 36 ft/lbs + Drag (measured in ft/lbs)
TX02482-2-26-14
7 - 1
Determining Fusion Force
Torque Wrench Pit Bull 26
Reading Jaw Axial Force
(Ft Lb) (Lb)
10 133
20 266
30 399
40 531
50 664
60 797
70 930
80 1063
90 1196
100 1329
Torque Wrench Pit Bull 26
Reading Jaw Axial Force
(Ft Lb) (Lb)
10 115
20 215
30 330
40 435
50 545
60 660
70 780
80 915
90 1025
100 1140
These tables are only valid when using
the appropriate torque wrench and
adapter. A 1/2" drive, 15.0" torque
wrench with the torque wrench adapter
(Part # 410802) or a 3/8" drive,
13.625" torque wrench with torque
wrench adapter (Part # 713901). Using
a torque wrench of a different length will
result in different forces from the torque
reading.
PH
04
27
4-
7-
20
-10
1/2" drive, 15" torque wrench 3/8" drive, 13.625" torque
wrench