HDPE Stub End
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- +86 15093100892
- inquiry@phtopindustry.com
- No.86 Jingsan Rd, Jinshui District, Zhengzhou City 45000, china
product category
HDPE Stub End (high-density polyethylene short pipe end) is a connection component designed for HDPE pipeline system, which uses hot-melt butt technology to achieve seamless connection with the main pipeline. This product is suitable for water supply and drainage, gas transmission, chemical pipelines and other fields. It has excellent characteristics such as good sealing, corrosion resistance and impact resistance. It is a key transition connection in HDPE pipeline system.
Product Features
1. High-strength connection: using high-quality PE100/PE80 raw materials, welding strength ≥ parent material strength
2. Perfect sealing: hot-melt butt process ensures zero leakage at the interface
3. Strong corrosion resistance: resist acid, alkali and various chemical media erosion
4. Long service life: design life of more than 50 years
5. Complete specifications: DN20-DN1200 multiple sizes are available
6. Convenient installation: standardized butt welding process, high construction efficiency
HDPE Stub End Application areas
1. Municipal water supply and drainage pipeline system
2. Gas transmission pipeline network
3. Industrial fluid transmission pipeline
4. Agricultural irrigation system
5. Mine tailings transmission pipeline
Butt welding construction steps
1. End surface preparation: Use a special milling cutter to ensure that the connection end surface is flat and clean
2. Heating plate heating: Set the heating temperature to 210±10℃
3. Welding butt: Butt fusion under specified pressure
4. Cooling and shaping: Maintain pressure until completely cooled
Specification
| dn | L | H | D1 | D | e | e | e |
| SIZE(dn) | mm | mm | mm | mm | SDR17 | SDR13.6 | SDR11 |
| F50 | 73 | 64 | 55 | 80 | 4.6 | ||
| F63 | 82 | 70 | 68 | 96 | 5.8 | ||
| F75 | 86 | 74 | 80 | 110 | 6.8 | ||
| F90 | 103 | 84 | 95 | 128 | 8.2 | ||
| F110 | 123 | 103 | 116 | 150 | 10 | ||
| F125 | 113 | 93 | 130 | 158 | 9.2 | 11.4 | |
| F140 | 110 | 90 | 145 | 182 | 10.3 | 12.7 | |
| F160 | 127 | 105 | 165 | 203 | 11.8 | 14.6 | |
| F180 | 135 | 110 | 190 | 212 | 13.3 | 16.4 | |
| F200 | 143 | 120 | 205 | 252 | 14.7 | 18.2 | |
| F225 | 135 | 112 | 230 | 268 | 16.6 | 20.5 | |
| F250 | 168 | 136 | 260 | 320 | 18.4 | 22.7 | |
| F280 | 160 | 133 | 285 | 318 | 20.6 | 25.4 | |
| F315 | 168 | 135 | 335 | 370 | 23.2 | 28.6 | |
| F355 | 155 | 125 | 360 | 430 | 26.1 | 32.2 | |
| F400 | 172 | 135 | 415 | 482 | 23.7 | 29.4 | 36.3 |
| F450 | 188 | 142 | 465 | 530 | 26.7 | 33.1 | 40.9 |
| F500 | 218 | 168 | 515 | 585 | 29.7 | 36.8 | 45.4 |
| F560 | 220 | 172 | 570 | 625 | 33.2 | 41.2 | 50.8 |
| F630 | 230 | 175 | 645 | 685 | 37.4 | 46.3 | 57.2 |
| F710 | 230 | 170 | 730 | 800 | 42.1 | 52.2 | |
| F800 | 230 | 170 | 820 | 905 | 47.4 | 58.8 | |
| F900 | 230 | 170 | 920 | 1000 | 53.3 | ||
| F1000 | 260 | 200 | 1020 | 1100 | 59.3 | ||
| F1200 | 300 | 225 | 1220 | 1300 | 71.1 | ||
| F1400 | 400 | 295 | 1430 | 1500 | 83.0 |
The socket-welded HDPE Stub End innovatively combines the dual advantages of socket-welded convenient installation and welded permanent sealing, and is an upgraded solution for traditional butt welding and electric fusion welding technologies.
Product Features
Connection method: Socket-welded structure + rubber ring seal, no hot melt equipment required
Installation speed: fastest (5-10 minutes/joint)
Removability: supports non-destructive disassembly, easy maintenance
Applicable pipe diameter: DN20-DN110
Comparison with traditional technology scenarios
VS butt welding
Advantages: Save 75% of construction space (suitable for narrow environments such as pipe corridors)
Case: A subway project uses socket welding, shortening the construction period by 40 days
VS electric fusion welding
Advantages: No power dependence (suitable for field operations)
Case: Plateau water supply project overcomes power supply problems at an altitude of 4500m
Specification
| Name | Spec | OD(mm) | L(mm) | Socket Length(mm) | Collar(mm) |
| Socket Fusion Stub End | 20 | 29 | 24 | 18 | 47 |
| 25 | 33 | 24 | 18 | 52 | |
| 32 | 42 | 26 | 23 | 61 | |
| 40 | 51 | 30 | 24 | 71 | |
| 50 | 60 | 30 | 25 | 80 | |
| 63 | 77 | 34 | 28 | 100 | |
| 75 | 88 | 40 | 32 | 118 | |
| 90 | 108 | 46 | 33 | 128 | |
| 110 | 129 | 46 | 38 | 150 |
The electric fusion type HDPE Stub End is a high-efficiency connector that achieves molecular-level fusion of HDPE pipes and flange systems through built-in resistance wire heating. It uses intelligent electric fusion technology to ensure that the joint strength is ≥ the parent material, and is widely used in high-standard pipeline projects in the fields of gas, chemical, and municipal engineering.
Product features
Connection method: built-in heating wire, power on heating and fusion
Installation time: 15-25 minutes (including cooling)
Automation level: programmable control, data traceability
Applicable pipe diameter: DN20-DN800 (mainly small and medium diameter)
Advantages
✔ Flexible construction: suitable for narrow spaces (such as pipe corridors, tunnels)
✔ Data monitoring: automatic recording of welding parameters, quality traceability
✔ Reliable sealing: no rubber ring, fusion sealing
Limitations
✖ Dependence on power supply: construction in the field or without electricity is limited
✖ High joint cost: electric fusion sleeves are expensive
Applicable scenarios
Urban underground integrated pipe corridors
Power and communication pipeline protection sleeves
Key nodes that require high-precision welding
Specification
| dn | D1 | D2 | L1 | L | SDR |
| Size(mm) | mm | mm | mm | mm | |
| 50 | 66 | 88 | 11 | 72 | SDR11 |
| 63 | 80 | 102 | 12 | 75 | SDR11 |
| 75 | 95 | 125 | 15 | 78 | SDR11 |
| 90 | 111 | 140 | 15 | 85 | SDR11 |
| 110 | 136 | 175 | 18 | 90 | SDR11 |
| 125 | 152 | 190 | 20 | 98 | SDR11 |
| 160 | 194 | 112 | 24 | 112 | SDR11 |
| 200 | 240 | 122 | 27 | 122 | SDR11 |
| 200 | 228 | 115 | 20 | 115 | SDR17 |
| 250 | 298 | 133 | 33 | 133 | SDR11/17 |
| 315 | 367 | 165 | 45 | 165 | SDR11 |
| 355 | 426 | 472 | 45 | 182 | SDR11 |
| 400 | 478 | 528 | 50 | 225 | SDR11 |
| 500 | 598 | 650 | 55 | 258 | SDR11 |
| 560 | 670 | 730 | 63 | 260 | SDR11 |
| 315 | 358 | 402 | 32 | 145 | SDR17 |
| 355 | 409 | 455 | 45 | 182 | SDR17 |
| 400 | 459 | 527 | 40 | 225 | SDR17 |
| 450 | 510 | 584 | 45 | 235 | SDR17 |
| 500 | 580 | 645 | 49 | 258 | SDR17 |
| 560 | 646 | 720 | 53 | 260 | SDR17 |
| 630 | 718 | 810 | 54 | 280 | SDR17 |
A comprehensive comparison of the three major connection technologies
| Technical Parameter | Socket Fusion Type | Butt Fusion Type | Electro-Fusion Type |
| Connection Principle | Mechanical socket + thermal fusion dual sealing | End-face hot fusion | Resistance wire heating fusion |
| Installation Time | 8–12 minutes/joint | 20–30 minutes/joint | 15–25 minutes/joint |
| Equipment Required | Portable heater (2 kg) | Heavy-duty welding machine (50 kg+) | Specialized electro-fusion welder |
| Tolerance Allowance | ±5° angle compensation | Must be perfectly aligned | ±3° angle compensation |
| Water Hammer Resistance | 1.5 times design pressure | 1.2 times design pressure | 1.3 times design pressure |
| Applicable Pipe Size | DN50–DN800 | DN110–DN1200 | DN20–DN630 |
| Cost Efficiency | Overall cost reduced by 35% | High equipment investment | Highest joint cost |
Selection suggestions
When choosing Socket Fusion type:
✅ Need quick installation
✅ Limited budget
✅ May need to adjust later
When choosing Butt Fusion type:
✅ High pressure, high corrosion environment
✅ Extra large diameter pipes (DN800+)
✅ Require permanent zero leakage
When choosing Electrofusion fusion type:
✅ Limited construction space (such as underground pipe gallery)
✅ Need welding data traceability
✅ High-precision connection of small and medium diameters
FAQ
What is the purpose of a stub end?
1. Material conversion bridge
Achieve seamless connection between HDPE pipe and metal flange
Solve compatibility issues of direct connection between plastic and metal
Typical applications: Chemical plant reactor interface/wastewater treatment plant pump station connection
2. Essential component of slip-on flange system
Used in combination with loose flange to form a rotatable connection structure
During maintenance, the flange can be removed separately without affecting the centering of the pipeline
Especially suitable for petrochemical units that require frequent maintenance
3. Stress buffer device
Effectively absorb the thermal deformation difference between HDPE pipe (thermal expansion coefficient 1.8×10⁻⁴/℃) and metal parts
Prevent stress concentration in the pipeline system caused by temperature difference
What is the difference between a stub end and a flange adapter?
Stub End and flange joint are two different connection methods in the pipeline system. They have significant differences in structure, function and application scenarios. The following is a detailed comparative analysis:
1. Structure and composition
| Item | Stub End Joint | Flange Joint |
| Basic Structure | Consists of HDPE stub end + lap joint flange | Direct connection via two bolted flanges |
| Connection Method | One end is butt-fused to HDPE pipe, the other mates with a lap joint flange | Both ends are flanged and bolted together |
| Typical Pairing | Must be used with a lap joint flange | Can directly pair with flanges of the same specification |
2. Functional Features Comparison
| Feature | Stub End Joint | Flange Joint |
| Adjustability | ✔ Flange rotates 360° for bolt alignment | ✖ Fixed flange, requires precise alignment |
| Maintenance Ease | ✔ Only loosen bolts to detach flange | ✖ Requires full disassembly of flange set |
| Stress Relief | ✔ Effectively mitigates thermal stress between HDPE and metal | ✖ Rigid connection prone to stress concentration |
| Corrosion Resistance | ✔ HDPE end maintains full corrosion continuity | ✖ Metal flange contacts medium directly (requires additional anti-corrosion treatment) |
3. Application Scenarios Comparison
| Scenario | Stub End Joint Advantages | Flange Joint Suitability |
| HDPE-to-Metal Transition | Mandatory solution (e.g., HDPE pipe connecting to steel valve in chemical plants) | Only suitable for metal-to-metal pipe connections |
| Frequent Maintenance Areas | Ideal for pump inlets/outlets, filters, and other detachable nodes | Permanent connections (e.g., underground mains) |
| Corrosive Environments | Acid/alkali transport systems (preserves HDPE anti-corrosion layer) | Requires special flanges (e.g., plastic-lined) at higher cost |
| Thermal Expansion Systems | Suitable for high-temperature variation (solar pipelines, thermal networks) | Requires expansion joints for thermal displacement compensation |
4. Installation & Cost Comparison
| Item | Stub End Joint | Flange Joint |
| Installation Complexity | Requires HDPE butt fusion + machining, higher technical skill | Simple bolting, easier construction |
| Material Cost | Higher (additional lap joint flange required) | Lower (standard flanges are cost-effective) |
| Lifecycle Cost | Lower (easy maintenance + superior corrosion resistance) | Higher (requires periodic gasket replacement/anti-corrosion treatment) |
| Pressure Rating | Typically PN10-PN16 (limited by HDPE material) | Can exceed PN40 (metal flanges withstand higher pressure) |
5. Selection Recommendations
Prefer short pipe joints:
Connecting HDPE pipes to metal equipment
The system needs to be frequently disassembled for maintenance
The medium is highly corrosive
There is a significant difference in thermal expansion
Prefer flange joints when:
Permanent connection between metal pipes
High pressure and high temperature conditions (>PN25/80℃)
Budget is limited and frequent maintenance is not required
Space is limited and hot melt operation is not possible
