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Fusion Pressure Calculator

Fusion Pressure Calculator

Jan 6,2023
Learn To Calculate Fusion Pressure
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

butt fusion machine
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
butt fusion machine
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
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

Use Chart A (above) to find the TEPA of your machine.

TEPA = 4.710 (we are using the 28 as an example)

Using the information we have gathered from above.

{(OD - T) x T x PI x IFP}/TEPA        + DRAG = Gauge Pressure

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. 

About Welping Machinery

Founded with a youthful spirit and a commitment to excellence, Welping Machinery stands as a leading manufacturer of piping tools. Our dedicated team values each customer's experience and strives for mutual growth through unwavering dedication to product quality, service excellence, and continuous innovation.

Welping's butt welding machines offer significant advantages across various industries:

  • Pipeline Manufacturing Companies: Our machines seamlessly connect plastic pipes, meeting the rigorous demands of pipeline manufacturing.

  • Construction Companies: Welping's equipment ensures the safe and reliable installation of pipelines, bolstering the integrity of building systems.

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  • Agricultural Irrigation Companies: Our machinery facilitates the installation and maintenance of pipeline networks, optimizing efficiency in agricultural irrigation.

  • Oil and Gas Transmission Companies:Welping's butt welding machines uphold the integrity and safety of pipeline systems critical for oil and gas transmission.

  • Power and Telecommunication Companies:We offer solutions for the installation and protection of cables, safeguarding infrastructure in these essential sectors.

  • Export Trading Firms: Welping Machinery caters to export trading firms, providing tailored solutions to meet diverse regional market demands.

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