McElroy Pit Bull 250, Руководство оператора

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9 - 1
Determining Fusion Pressure
Variable Definitions
O.D. = Outside Diameter of Pipe (inch)
t
= Wall Thickness of Pipe (inch)
 = 3.14
SDR = Standard Dimensional Ratio of Pipe (unitless)
IFP = Interfacial Pressure of Pipe (PSI)
TEPA = Total Effective Piston Area of Carriage Cylinders
(inch²)
Formulas
O.D.
t = ------------
SDR
PIPE AREA = (O.D. - t) x t x ∏
FUSION FORCE = AREA x IFP
FUSION FORCE
GAUGE PRESSURE = ----------------------------------------------- + DRAG
TEPA
Example
Pipe Size = 8" IPS, SDR 11
O.D. = 8.625 inch
DRAG = as measured in PSI (for this example use 30 PSI)
Recommended IFP = 75 PSI
Using a Model 28 High Force Fusion Unit
O.D. 8.625
t = ------------- = --------------- = 0.784
SDR 11
TEPA = 4.71 (From Table)
(O.D. - t) × t × ∏ × IFP
GAUGE PRESSURE = ----------------------------------------------- + DRAG
TEPA
(8.625 - .784) × .784 × 3.14 × 75
GAUGE PRESSURE = ----------------------------------------------------------------------------------- + 30 PSI = 338 PSI
4.71
TX02893-04-18-16
Fusion High Force Medium Low Force
Model
A160/A250 - - 0.90
28 4.71 3.24 1.66
250 4.71 3.24 1.66
412 11.78 6.01 3.14
618 11.78 6.01 3.14
500 - 6.01 3.14
824/T630 29.44 15.32 9.43
1236/T900 29.44 15.32 9.43
1648/T1200 31.42 14.14 -
2065 31.42 - -
1600 31.42 14.14 -
2000 32.99 - -
Total Effective Piston Areas (in²)