Fusion Pressure Calculator
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- Issue Time
- Jan 6,2023
Summary
To properly fuse pipe the fusion pressure must be adjusted so the pipe manufacturers recommended interfacial pressure is achieved.
Learn To Calculate Fusion Pressure
EXAMPLE
Using a 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
Total Effective Piston Area
| Model | High Force Standard | Medium Force High Velocity | Low Force Extra High Velocity |
|---|---|---|---|
| 28 | 4.71 | NA | 1.67 |
| 412 | 11.78 | 6.01 | 3.14 |
| 618 | 11.78 | 6.01 | 3.14 |
| 500 | NA | 6.01 | NA |
| 824 | 29.44 | 15.32 | 9.45 |
| 1236 | 29.44 | 15.32 | 9.45 |
| 900 | NA | 15.32 | NA |
| 1648 | 31.42 | 14.14 | NA |
| 2065 | 31.42 | NA | NA |
STEP 1. - CALCULATING WALL THICKNESS:
To determine wall thickness we will be using the Example (above).
T = OD/DR = Wall thickness
Now the Example and the formula above we will calculate the wall thickness.
T = 8.625/11 = .784
STEP 2. - FINDING TOTAL EFFECTIVE PISTON AREA
Use Chart A (above) to find the TEPA of your machine.
TEPA = 4.710 (we are using the 28 as an example)
STEP 3. - CALCULATING GAUGE PRESSURE
Using the information we have gathered from above.
{(OD - T) x T x PI x IFP}/TEPA + DRAG = Gauge Pressure
STEP 4. - COMPLETED FORMULA
Now using all the information and the formula above we will find the gauge pressure.
{(8.625 - .784) x .784 x 3.1416 x 75}/4.710 + 30 PSI = 338 PSI
If you are working on a butt fusion project or have questions/issues relating to this process, contact our fusion specialists.