Untuk menyatukan pipa termoplastik dengan benar dan memastikan kualitas penyambungan, operator selalu berkewajiban untuk menemukan tekanan dan waktu yang tepat ketika menyambungkan sesuai dengan standard yang diminta. Anda dapat melakukan konsultasi dengan team kami untuk tabel penyambungan menggunakan mesin AMD butt fusionm atau anda dapat menggunakan perhitungan yang lainnya. Perhitungan kami menggunakan standard ISO 21307:2017 sebagai contoh.

Standard: ISO21307:2017 Single Low-pressure
Machine: AMD Butt Fusion Welding Machine SHD 315
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

e_n= d_n/ SDR = 315mm / 17 = 18.52 mm

P₁= P3 0.19 x {π x (d_n-e_n) x e_n}÷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