Polyethylene flanged compression fitting is a fast, reliable, and economical solution for connecting polyethylene pipes to flanged equipment such as valves, pumps, meters, and tanks. Owing to dependable sealing, easy installation, and the ability to be reopened for periodic service, this fitting is widely used in urban and rural water supply projects, sewage transfer lines, pressurized irrigation systems, and industrial networks. The body is made of polypropylene copolymer with 10-bar pressure rating, the internal grip ring is polyacetal, and—together with an elastomeric O-ring—ensures a firm, leak-free joint.
Technical Specifications and Structure
- Body: Polypropylene copolymer (PP-Copolymer), impact-resistant against installation stresses and pressure fluctuations; working pressure class PN10.
- Grip Ring: Polyacetal (POM) for uniform engagement with the pipe wall and slip prevention.
- Nut: Reinforced PP to transmit uniform torque to the assembly.
- O-Ring: Elastomer resistant to water and many common chemicals in treatment plants and agriculture.
- Environmental Stability: Good resistance to UV radiation and weather; suitable for outdoor use with proper storage.
- Temperature & Fluid: Suitable for cold water, sewage, and compatible fluids; typical service range 0 to 40 °C (project-dependent).
- Pipe Compatibility: Works with PE80 and PE100 pipes per common polyethylene pipe standards.
Applications
- Urban & industrial piping: As a terminal fitting to connect PE pipe to flanged equipment.
- Irrigation systems: Suitable for sprinkler and drip systems at typical operating pressures with stable sealing.
- Water & wastewater transfer: Usable in water-supply networks, effluent lines, and rural facilities.
- Size variety: Offered in common PE pipe sizes; select based on pipe outside diameter and flange DN.
Size Selection Guide
Selection is based on the outside diameter of the PE pipe (mm) and the nominal flange size (DN). The table below shows a typical mapping:
| PE Pipe Outside Diameter (mm) | Corresponding Flange DN | Recommended Pressure Class | Selection Note |
|---|---|---|---|
| 32 | DN25 | PN10 | Connection to a one-quarter-inch industrial valve equivalent to DN25 |
| 40 | DN32 | PN10 | Suitable for irrigation branches and reinforced domestic uses |
| 50 | DN40 | PN10 | Inlet/outlet of light pumps |
| 63 | DN50 | PN10 | Connection to commonly used equipment in distribution networks |
| 75 | DN65 | PN10 | Conveying medium flows on farms |
| 90 | DN80 | PN10 | Small pumping stations |
| 110 | DN100 | PN10 | Manifolds and light main lines |
Note: To ensure bolt-pattern compatibility with the mating flange, verify matching PN pattern (e.g., PN10) and bolt diameter per the part datasheet.
Components and Materials
| Component | Material | Function |
|---|---|---|
| Body | Polypropylene copolymer (PP-Co) | Withstand pressure and hold the assembly |
| Nut | Reinforced PP | Transmit torque and compress the sealing assembly |
| Grip Ring | Polyacetal (POM) | Mechanical lock on the pipe |
| Sealing O-ring | Resistant elastomer | Seal between pipe and body |
| Reinforcing bush (in some sizes) | Polymer/metal | Stabilize pipe mouth during tightening |
Advantages
- Fast installation with no welding: Eliminates butt-fusion or electrofusion at the line end.
- Reopenable for maintenance: Allows periodic service, O-ring replacement, or relocation.
- Reliable sealing: Controlled O-ring compression prevents leakage at the stated working pressure.
- Environmental resistance: Durable against UV, humidity, and common chemicals in water and irrigation networks.
- Broad compatibility: Connects to various valves, flow meters, filters, and flanged tanks.
Step-by-Step Installation Instructions
- Cut & prepare the pipe: Cut perpendicular to the axis; deburr and clean.
- Inspect parts: Check integrity of body, nut, ring, and O-ring.
- Fit on the pipe: Place the nut and then the ring assembly on the pipe in the correct orientation.
- Insert pipe into body: Push the pipe to the internal stop to achieve sufficient engagement length.
- Tighten the nut: Hand-tighten to contact, then use a wrench to reach the manufacturer’s recommended tightness without over-torquing.
- Align flanges: Place a gasket between flanges; ensure clean, aligned faces.
- Tighten bolts: Cross-tighten in several passes for even pressure.
- Test pressurization: Pressurize the line gradually and monitor the joint for leaks.
- Final adjustment: If needed, tighten bolts slightly and uniformly.
- Record & label: Log installation date and test pressure.
Operation and Maintenance Notes
- Working pressure: Observe PN10 for long-term stability.
- Temperature: Avoid operation outside recommended ranges for PP/POM.
- Fluids: Use for water, effluent, and compatible fluids; avoid aggressive solvents.
- Periodic checks: Verify flange-bolt torque and O-ring condition during service intervals.
- Storage: Keep away from direct sunlight in a dry, cool area; avoid loading on threads and edges.
Common Errors and Remedies
- Insufficient pipe engagement length: Causes slippage; remedy: insert fully to internal stop.
- Asymmetric flange-bolt tightening: Causes localized leaks; remedy: cross-tighten in stages.
- Flange misalignment: Overloads the body; remedy: align before pressurization.
- Over-tightening the compression nut: Damages threads/O-ring; remedy: use controlled torque.
- Mismatched gasket: Reduces sealing; remedy: choose proper thickness and material for PN10.
Quality Control and Acceptance Criteria
- Visual inspection: No cracks, voids, warping, or defective threads.
- Sample hydrostatic test: Test pressure per factory instructions.
- Dimensional conformity: O-ring seat diameter, pipe insertion depth, and flange bolt-pattern.
- Product markings: Size, pressure class, batch number, and material on the body.
Choosing Between Flanged Compression and Other Methods
- Versus butt-fusion: Shorter installation time, no fusion machine/operator needed.
- Versus electrofusion: Lower equipment costs and re-openable connection.
- Line ends and near equipment: Easy access for servicing and gasket/O-ring replacement.
Example Use Cases
- Connecting an irrigation manifold to a DN50 gate valve: Quick farm commissioning with seasonal disassembly.
- Pump inlet at a small station: Reduced downtime with fast replacement.
- Outlet of sand/disc filters: Reliable connection with minimal leakage at typical farm pressures.
Purchasing Guide and Execution Notes
- Select size by PE pipe OD and DN of the flanged equipment.
- Pay special attention to pressure class (PN10) and seal quality.
- Review the product datasheet for materials, batch number, and test results.
- For larger sizes, using a reinforcing bush (if recommended by the manufacturer) improves stability.
Tamambaha, as a supplier of polyethylene flanged compression fittings, offers this product in sizes commonly used in water, wastewater, and irrigation networks. With emphasis on product authenticity and clear technical specifications, it helps buyers choose sizes matched to their pipe OD and equipment DN; of course, customers in English-speaking markets may also source from local distributors if preferred.
