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McElroy > Fusion Pressure > Calculate


Learn to Calculate Fusion Pressure

EXAMPLE 1:
Using a No.28 Machine from Chart A (at right) we will determine our gauge pressure.

Pipe Size = 8" IPS
OD of Pipe = 8.625
DR of Pipe = 11
IFP = 75 PSI
Measured Drag = 30 PSI

VARIABLE DEFINITIONS:

OD = Outside diameter
T = Wall thickness
PI = 3.1416
DR = Dimensional ratio
IFP = Manufacturers recommended interfacial pressure
TEPA = Total effective piston area
DRAG = Force required to move pipe

Chart A TOTAL EFFECTIVE PISTON AREA
Model High Force
Standard
Medium Force
High Velocity
Low Force
Extra High Velocity
No.28 4.71 NA 1.67
No.412 11.78 6.01 3.14
No.618 11.78 6.01 3.14
Trac 500 II NA 6.01 NA
No.824 29.44 15.32 9.45
No.1236 29.44 15.32 9.45
Trac 900 NA 15.32 NA
No.1648 31.42 14.14 NA
No.2065 31.42 NA NA
Step 1. Calculating Wall Thickness:
To determine wall thickness we will be using Example 1 (from above).
The Formula:

T =

OD
DR

= Wall Thickness

Now using Example 1 and the formula above we will find the wall thickness.
Calculated Wall Thickness:

T =

8.625
11

= .784

Step 2. Finding Total Effective Piston Area
Use Chart A (above right) to find the TEPA of your machine.
TEPA = 4.710 (we are using the No.28 as an example)
Step 3. Calculating Gauge Pressure
Calculating Gauge Pressure Using the information we have gathered from above.
The Formula

(OD - T) x T x PI x IFP
TEPA

+ DRAG = Gauge Pressure

Step 4. Completed Formula
Now using all the information from above, and the formula above we will find the gauge pressure.
Calculated Gauge Pressure

(8.625 - .784) x .784 x 3.1416 x 75
4.710

+ 30 PSI =

338 PSI















 
                 
 
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