50mm poly pipe fittings overview
1. Basic definition
50mm poly pipe fittings (HDPE pipe fittings) refer to a series of fittings used to connect, divert and divert 50mm HDPE pipes. They are made of high-density polyethylene material and have excellent corrosion resistance, impact resistance and long life.
2. Main features
Chemical corrosion resistance, suitable for a variety of media transportation
Good flexibility and excellent seismic performance
Smooth inner wall and low fluid resistance
Light weight and easy installation
Service life can reach more than 50 years
Main types of 50mm polyethylene pipe fittings
1. Connection fittings
| Type | Function Description | Applicable Scenarios |
| Straight Coupling | Straight connection of same-diameter pipes | Pipeline extension section |
| Flange Joint | Connection between pipe and equipment | Pump and valve interfaces |
| Union Joint | Detachable connection | Areas requiring frequent maintenance |
2. Steering fittings
| Type | Angle Specification | Special Model |
| 45° Elbow | 45-degree direction change | Long radius elbow |
| 90° Elbow | Right-angle direction change | Short radius elbow |
| Tee | Flow splitting/merging | Equal/Reducing tee |
3. Special function pipe fittings
Expansion joint: Compensate for thermal expansion and contraction of pipes
Pipe plug: Close the end of the pipe
Reducing joint: Conversion of different pipe diameters
Saddle tee: Branch with pressure opening
50mm poly pipe fittings technical parameters
1. Size specifications
Nominal diameter: DN50 (actual outer diameter is about 50mm)
Wall thickness range: 3.0-4.5mm (varies according to SDR value)
Connection method:
Socket type (rubber ring seal)
Hot-melt butt type
Electrofusion connection type
2. Pressure level
| SDR Value | Wall Thickness (mm) | Working Pressure (MPa) |
| SDR11 | 4.6 | 1.0 |
| SDR17 | 2.9 | 0.6 |
| SDR26 | 2.0 | 0.4 |
3. Material standards
Raw material grade: PE80/PE100
Implementation standard: GB/T 13663.2-2018
Color identification:
Black: General type
Blue: Water supply only
Yellow: Gas only
Selection points
1. Medium adaptability selection
Water supply system: Use food-grade PE100 raw materials
Chemical pipeline: Need special acid and alkali resistant formula
Gas transportation: Must use yellow special pipe fittings
2. Connection method selection
Hot melt connection: Permanent connection, good sealing
Electrofusion connection: Easy to install, suitable for small spaces
Mechanical connection: Removable, easy to maintain
3. Quality identification method
Appearance inspection:
Smooth surface without bubbles
Uniform wall thickness
Clear and complete identification
Performance test:
Hydrostatic test
Melt mass flow rate test
Oxidation induction time test
Installation specifications
1. Hot-melt connection steps
Clean the connection surface of pipes and fittings
Mill the end surface with special tools
Raise the temperature of the heating plate to 210±10℃
Apply appropriate pressure for welding
Cool down to room temperature while maintaining pressure
2. Key points of electric fusion connection
A special electric fusion welding machine must be used
Operate strictly according to the parameters marked on the pipe fittings
Moving the pipe is prohibited during cooling
3. Installation precautions
Avoid construction in an environment below 5℃
Fittings from different manufacturers should not be mixed
Concrete piers should be set at the bends
Tracer lines are required for underground laying
Application scenarios of 50mm poly pipe fittings
1. Municipal engineering
Water supply and drainage network system
Medium and low pressure gas transmission
Cable protection sleeve
2. Industrial field
Chemical fluid transmission
Mine tailings discharge
Food factory process pipeline
3. Agricultural application
Drip irrigation system
Greenhouse water supply
Livestock farm sewage discharge
Solutions to common problems
1. Leakage at the joint
Reason: Insufficient welding temperature/inadequate socket
Handling: Reconnect after cutting
2. Pipe cracking
Reason: External impact/Aging of materials
Prevention: Choose high-quality raw material pipes
3. Difficult installation
Countermeasures:
Preheat the pipes before winter construction
Use special installation tools
Choose pipes with guide ports
Purchase tips: It is recommended to choose a manufacturer that has passed ISO9001 certification and requires product test reports and quality assurance commitments. Sample testing should be carried out before purchasing in large quantities.
