Butt-Fusion End Cap
Polyethylene butt-fusion end cap for permanent blind termination, pressure containment, and end sealing in water, gas, and sewer pipeline networks.
- Permanent monolithic pipeline dead-ending without maintenance-prone mechanical joints
- Withstands severe static head and dynamic surge forces at terminal pipeline stations
- Manufactured across standard dimension ratios SDR 11, SDR 13.6, and SDR 17
- Reinforced hemispherical dome design ensuring optimal circumferential stress dispersion
- Zero maintenance requirement throughout an underground design life exceeding 50 years
Key Specifications
- Product code
- P051
- Reference standard
- EN 12201-3
- Material & grade
- PE
- Outside diameter
- 90–400 mm
- SDR
- 11, 13.6, 17
- Joint type
- Butt fusion
- Unit of sale
- Piece
- Applications
- Drinking water supply, Sewage, Gas distribution
- Dimensional options
- 39 rows in the specification table
Engineering design and function of butt-fusion caps
The butt-fusion end cap is a thick-walled hemispherical fitting used to permanently seal pipe ends at line terminations, future extension points, or pipeline test headers. Unlike removable mechanical caps, a butt-fusion cap fuses directly into the pipe wall, providing the most reliable, tamper-proof termination for high-pressure buried systems.
In compliance with EN 12201-3 provisions, the hemispherical geometry distributes internal hydrostatic thrust uniformly across the dome, mitigating stress concentrations at the fusion seam. This design ensures that hydraulic surges and water hammer shocks are safely contained.
Size range and fusion guidelines
Polyethylene butt-fusion end caps are typically produced across outside diameters from 90 to 400 mm in SDR 11, SDR 13.6, and SDR 17 schedules. The weld lip thickness matches adjacent pipe walls, allowing smooth alignment in hydraulic fusion machines.
Prior to welding, facing pipe and cap surfaces and degreasing the interface are vital. Once fully cooled under machine pressure, the capped line is ready for hydrostatic pressure testing. Submit required sizes and SDR classes through our RFQ portal for official pricing.
Butt-Fusion End Cap — Technical Specifications
Wall thickness and weight are calculated from the standard series and are approximate; final values are confirmed in the quotation.
| Outer Diameter (mm) | SDR |
|---|---|
| 90 | 11 |
| 90 | 13.6 |
| 90 | 17 |
| 110 | 11 |
| 110 | 13.6 |
| 110 | 17 |
| 125 | 11 |
| 125 | 13.6 |
| 125 | 17 |
| 140 | 11 |
| 140 | 13.6 |
| 140 | 17 |
| 160 | 11 |
| 160 | 13.6 |
| 160 | 17 |
| 180 | 11 |
| 180 | 13.6 |
| 180 | 17 |
| 200 | 11 |
| 200 | 13.6 |
| 200 | 17 |
| 225 | 11 |
| 225 | 13.6 |
| 225 | 17 |
| 250 | 11 |
| 250 | 13.6 |
| 250 | 17 |
| 280 | 11 |
| 280 | 13.6 |
| 280 | 17 |
| 315 | 11 |
| 315 | 13.6 |
| 315 | 17 |
| 355 | 11 |
| 355 | 13.6 |
| 355 | 17 |
| 400 | 11 |
| 400 | 13.6 |
| 400 | 17 |
Butt-Fusion End Cap — FAQ
What sizes are commonly supplied for butt-fusion end caps?
These end caps are typically manufactured in outside diameters ranging from 90 up to 400 mm for transmission mains.
Is a butt-fusion cap suitable for hydrostatic pressure testing?
Yes, a welded end cap provides the safest, most dependable blind termination for field hydrostatic pressure testing.
What pressure ratings apply to these end caps?
These fittings are produced in SDR 11 (16 bar), SDR 13.6 (12.5 bar), and SDR 17 (10 bar) pressure specifications.
Can a butt-fusion cap be removed after welding?
No, butt-fusion creates a permanent joint; to extend the pipeline in the future, the cap must be saw-cut off the line.
