HOW TO CALCULATE FUSION PRESSURE AND TIME


To properly fuse the thermoplastic pipes and ensure the weld quality, the operator is always obliged to find the right fusion pressure and time under the welding standard which requested by the project.

You could consult with our sales to ask for the welding table for Riyang butt fusion machine (Riyang fusion pressure calculator is on the way), or you could use other fusion pressure calculator APP to work out the pressure and time.This page will indicate how to calculate the fusion pressure and time manually, we will use the standard ISO21307:2017 as an example.

EXAMPLE

 

Standard: ISO21307:2017 Single Low-pressure

Machine: Riyang Basic Butt Fusion Machine V315

Pipe: OD315, SDR17

Step 1

Check below illustration for single low-pressure fusion jointing cycle.

 

Key

Xtime

Ypressure

P1bead-up pressure

P2heat soak pressure

P3fusion jointing pressure

t1bead-up time

t2heat soak time

t3heater plat removal time

t4time to achieve fusion jointing pressure

t5cooling time in the machine under pressure

t6cooling time out of the machine

Step 2

Check out the formula of the gauge pressure calculation

 

Where

GPis the gauge pressure (bar);

IPis the interfacial pressure (MPa);

ACis the total effective piston area, given by the manufacturer of butt fusion machine (mm2)

ASis the interfacial surface area (mm2)

DPis the drag pressure

Note: The interfacial pressure is the amount of force per unit of pipe area required to butt fuse the pipe or fitting ends.

Note: The interfacial pressure is the amount of force per unit of pipe area required to butt fuse the pipe or fitting ends.

Step 3

Refer to below tables for phases , parameters and values for single low-pressure fusion jointing procedure

 

Note:

1.(en + 3) This is the cooling time for the butt joint when still in the machine and under pressure. Cooling time may be shortened and should be lengthened depending on ambient temperature (approximately 1% per 1℃)

2.(d) A cooling time out of the machine and before rough handling maybe recommended.

Step 4

Now using all information and formula above we will calculate all values by maximum

 

en= dn/ SDR = 315mm / 17 = 18.52 mm

P1= P3 0.19 x {π x (dn-en) x en}÷2000 x 10} + 5 (for example) = 21 bar

P2DP = 5 bar

t1= bead-up size 0.5 + 0.1 x 18.52mm = 2.3 mm

t2(13.5 ± 1.5) x 18.52 = 278 s

t310 s

t43 + 0.03 x 315 = 12.5 s

t50.015 x 18.522- 0.47 x 18.52 + 20 = 16 min

t6d

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