Heavy Duty HDPE Siphonic S Trap Bend Pipe Fitting for Rainwater Drainage

Product Description

Product Description

Heavy Duty HDPE Siphonic S Trap Bend Pipe Fitting is a specialized drainage fitting designed for siphonic roof drainage systems in commercial, industrial, and public infrastructure projects. Manufactured from premium PE100 high density polyethylene, it combines excellent mechanical strength, corrosion resistance, and long term durability to ensure reliable performance in demanding drainage environments.

The fitting features an optimized S shaped water seal design that effectively prevents sewer gases, unpleasant odors, and insects from entering occupied spaces while maintaining efficient rainwater discharge. Its smooth internal flow path minimizes flow resistance and supports high capacity drainage performance, making it ideal for modern siphonic rainwater systems where rapid water removal is essential.

Application

Roof Rainwater Drainage Systems
Designed for siphonic roof drainage networks to ensure efficient rainwater discharge and stable system performance during heavy rainfall.

Commercial Buildings
Widely used in shopping centers, office buildings, hotels, hospitals, and public facilities for reliable roof drainage management.

Industrial Facilities
Suitable for factories, warehouses, manufacturing plants, and logistics centers requiring high-capacity rainwater drainage solutions.

Airport and Transportation Hubs
Applied in airports, railway stations, and transportation terminals where large roof areas demand efficient stormwater removal.

Sports and Public Infrastructure
Ideal for stadiums, exhibition halls, convention centers, and other large public buildings with extensive drainage requirements.

Municipal Rainwater Projects
Used in urban stormwater collection and drainage systems to improve rainwater management and reduce flooding risks.

Product Parameters

Heavy Duty HDPE Siphonic S Trap Bend Pipe Fitting	SIZE
	50mm,75mm,110mm

Detailed Photos

Step 1: Prepare the Pipe and Fittings

Step 2: Perform Butt Fusion Welding

Cut the HDPE pipe to the required length and ensure the pipe ends are clean, smooth, and free from dirt, moisture, and burrs. Check that the S trap and connecting pipes are correctly aligned before installation.

Heat both the pipe ends and the S trap connection ends using a butt fusion welding machine. Once the required fusion temperature is reached, join the components under controlled pressure to create a strong and homogeneous weld.

Step 3: Assemble and Position

Step 4: Inspect and Test

Allow the welded joints to cool naturally. Install the S trap in the designated drainage section, ensuring the correct orientation of the water seal structure. Verify that all connected pipes are properly supported and aligned.

Conduct a visual inspection of all fusion joints and confirm proper installation. Perform a drainage or leak test to ensure smooth water flow, effective water seal performance, and leak free operation before the system is put into service.

FAQ

1. Why choose us?
Factory Direct Pricing, Large Stock, Quality
(1).Manufacturer: Fittings from 20mm to 1400mm, rated PN10 to PN25.
(2).Custom branding & products, supported by three plants.
(3).Large inventory
(4).Competitive pricing with strict in-house quality control.
We rapidly source and consolidate all related piping products.

Common Uses of HDPE/PE/PPR/PERT II pipe & fittings?
Zhejiang Fengfeng Pipe Industry's HDPE/PE/PPR/PERT II pipe & fittings excel in construction, household, and agricultural applications. With strength and versatility, they serve urban and rural water projects, sewage systems, drainage, storm-water management, firewater pipelines, infrastructure, airports, railways, highways, sports venues, irrigation, geothermal systems, solar/wind farms, municipal water networks, agricultural irrigation, gas networks, natural gas pipelines, industrial systems, chemical plants, mining, and power plants.

Key Benefits of Electrofusion Fitting?
Zhejiang Fengfeng Pipe Industry's electrofusion fittings form a zero-leakage, permanent joint through a precisely controlled process, achieving a monolithic molecular bond between fitting and pipe, beyond mechanical sealing.

Detailed breakdown of the leak-proof connection process:

Core Principle: Molecular Diffusion & Interfusion:
Thermal fusion is key. When heated (~200-220°C), HDPE/PPR becomes viscous, allowing polymer chains to interdiffuse and entangle. Cooling fuses them into a continuous mass without seams.

Step-by-Step Zero Leakage Process

Role of "Smart" Technology in Ensuring Integrity:
Modern electrofusion uses embedded data in fittings, read by intelligent welders, ensuring leak-proof processes:
Barcode/Data Matrix: Holds welding parameters (voltage, time) specific to fitting size/material.
Automatic Process Control: Welder reads code, executes cycle automatically, removing human error.
Real-Time Monitoring: Welder checks resistance, temp, energy. Deviations signal cycle failure, preventing defects.
Data Logging: Digital record (date, time, location) ensures traceability and proof of correct installation.

(4).Comparison: Why Mechanical Fittings Can Leak:Electrofusion is superior:Feature Electrofusion Joint.Mechanical/Gasketed Joint.Sealing Mechanism Homogeneous molecular bond. Elastomeric seal compression against pipe surface.Weakness None, if procedure is correct. Seal aging, hardening, and creep over time. Vibration and thermal cycling sensitivity causing bolts to loosen.Performance Static or improves over time. Lifetime equal to pipe (50+ years). Degrades over time. Needs periodic re-torquing and seal replacement.

Conclusion: The Zero Leakage Assurance
Zhejiang Fengfeng Pipe Industry's electrofusion joint ensures no leaks by eliminating leakage interfaces. It's not a seal but a seamless union. Material science (molecular fusion), precision engineering (embedded coil & bead), and process intelligence (automated welding with data traceability) create an intrinsic, permanent, verifiable joint. This method is essential for leak-sensitive uses like gas, potable water, and chemical pipelines.

4.What is the Process Purpose & Anti-Leak Mechanism?
Step 1: Surface Preparation Pipe end is scraped to expose clean material, removing contamination that hinders molecular diffusion and causes weak bonds.

Step 2: Clamping & Alignment:
Pipe and fitting are securely clamped straight and aligned with a precise gap. Prevents stress and misalignment that cause voids or thin spots.

Step 3: Initiation & Heating:
Voltage is applied to the resistance wire coil in the fitting. The coil heats uniformly, melting the fitting's inner and the pipe's outer surfaces. Ensures a precise, uniform melt zone. Controlled heating prevents cold spots, incomplete fusion, and leaks.

Step 4: Melting & Interfusion:
Molten materials merge. Internal pressure ensures intimate contact, forcing materials to intermix. Fusion bead melts to fill gaps, compensating for surface irregularities, ensuring no voids.

Step 5: Controlled Cooling:
Power is cut, allowing natural, uniform cooling under restraint. Polymer chains solidify, preventing stress cracks. A stress-free joint maintains integrity under cyclic pressure and temperature changes.

5.What is HDPE?
High-Density Polyethylene (HDPE) is a strong yet lightweight thermoplastic made from petroleum. Known for its high strength-to-density ratio, HDPE has been popular since the 1950s due to its durability, impact resistance, and ability to withstand various conditions.
Using virgin HDPE from top producers like SHANGHAI JINFEI PETROCHEMICAL and ZHEJIANG PETROLEUM & CHEMICAL (grades: BH 1064, TR480AT 1768, 23050 HDPE 2125366, 07111) is key to the performance, safety, and value of pipe fittings for Zhejiang Fengfeng Pipe Industry, bringing measurable benefits.

(1).Guarantee of Core Performance & Longevity
Virgin Material Role: Maintains LTHS, ensuring PE100/PE100RC classification for 50+ years at PN16, PN25. Recycled material risks strength loss, failure, and SCG, leading to bursts.

(2).Environmental Stress Crack Resistance (ESCR).Virgin polymers resist chemicals, extending lifespan. Low ESCR in recycled materials can cause stress-initiated cracks.

(3).Consistent Electrofusion Quality: Stable MFR ensures uniform heating and fusion, creating a strong bond. Impurities lead to uneven heating and leaks.

(4).Dimensional Stability & Low-Temperature Toughness: Predictable shrinkage and impact resistance prevent fractures at -20°C. Recycled materials risk warpage and brittleness.

2. Critical Value for Projects & Business:
(1).Risk Mitigation & Safety Assurance:
Role: Virgin material is essential in gas, water, or chemical pipelines to prevent catastrophic failures.
Value: Protects reputation and avoids costs from failures, liability claims, and environmental damage.

(2).Passport to International Certification & Markets:
Role: Certifications (CE, ISO, WRAS) demand traceability and performance data, achievable only with virgin resin.
Value: Essential for entry into regulated markets like the EU, Middle East, and North America.

(3).Lowest Total Cost of Ownership:
Role: Higher initial cost ensures a maintenance-free system for 50+ years, saving on repairs.
Value: Reduces lifetime costs significantly; a single repair costs more than the price difference.

(4).Foundation for Credible Quality Commitment:
Role: Traceability to top producers guarantees quality.
Value: Provides compelling proof to engineers and contractors, building trust and justifying a premium.

Conclusion: The Strategic Message
Highlighting traceable, virgin raw materials sends a strong message to clients, especially international buyers:
Zhejiang Fengfeng Pipe Industry's reliability is crafted at the molecular level. We invest in higher material costs to protect your projects against decades of risk and potential catastrophic expenses. This isn't just a fitting—it's a 50-year performance warranty.
This shifts the competitive focus from price to value, responsibility, and risk management, positioning Zhejiang Fengfeng Pipe Industry as a provider of critical infrastructure solutions, beyond mere commodities.