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Butt Fusion Procedure
Note: Guideline only - exact time depends upon environmental conditions and condition of Fusion Equipment.
Procedure:
- Preheat heating tool 260° C (500° F).†
- Place pipe ends into fusion machine clamps.
- Plane ends of pipe to perfectly smooth, flat faces.
- Remove any excess shavings. Do not use hands to wipe faces ends.
- Bring pipe ends together and carefully check alignment.
- Bring pipe ends together against heating tool, fingertip pressure only, until a bead of molten material is visible around both pipe ends.
- Heating Time Cycle begins when bead is visible around entire pipe.
- "Snap" traveling carriage back and remove heating tool.
- Bring pipe ends together. Do not "slam". Apply sufficient pressure so that the fusion bead will double back on pipe surface. For fully automatic fusion machines, the interfacial pressure during fusion should be approximately 75 PSI.
- Remove pipe from fusion machine. After fusion bead has cooled sufficiently to handle, clean heater plates to ensure that you do not damage coating on faces.
Cold Weather Procedure:
- In cold weather, the initial bead will take longer to form due to low pipe temperature. Heating cycles begin once the bead has formed around the entire circumference of pipe. Pipe clamps may have to be shimmed to prevent pipe slippage during joining. Check to see that heating tool surface temperature is 260° C (500° F). Use Tempilstiks.
Butt Fusion Times HDPE3408:
| Pipe Size IPS (inches) |
Heating Time (seconds) * |
Cooling Time (seconds) * |
Melt Bead Size (inches) |
| 1 |
16 - 20 |
90 |
1/16 |
| 1-¼ |
20 - 24 |
90 |
1/16 |
| 2 |
28 - 32 |
90 |
1/8 |
| 3 |
32 - 38 |
180 |
1/8 |
| 4 |
38 - 44 |
210 |
1/8 to 3/16 |
| 6 |
56- 66 |
240 |
3/16 |
| 8 |
72 - 82 |
300 |
3/16 to 1/4 |
* Times are approximate and will vary with ambient conditions.
† Note: Suggested lower temperatures will produce acceptable results with corresponding adjustments to heating times (longer for lower temperatures). Reference ASTM D2657 - Standard practice for heat fusion joining of polyolefin pipe and fittings.
Visual Inspection:
- Melt beads should be completely rolled back on both sides of the joint and touching the pipe wall.
- Melt should be of uniform height and width.
- Pipe and fitting ends must be properly aligned.
- Melt bead area should be free of gaps or voids.
Return to Socket Fusion Fittings
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