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HDPE Drainage Pipes And Fittings

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I Product Introduction

HDPE siphonic drainage fittings are specialized connection components designed for siphonic roof drainage systems, manufactured from PE100-grade high-density polyethylene through precision injection molding. HDPE Drainage Pipes and Fittings uses siphonic roof drains to entrap air, and through precise hydraulic balancing calculations, relies on the building’s potential energy to create full-bore flow within sealed pipelines, generating a siphon effect that rapidly discharges roof rainwater to stormwater manholes. Unlike conventional drainage fittings, siphonic fittings must withstand the negative pressure generated during system operation while ensuring unobstructed flow under full-bore conditions. The product range covers complete specifications including siphonic roof drains, electrofusion elbows, electrofusion tees, electrofusion swept tees, and eccentric reducers. Widely used in roof drainage systems for large-span buildings such as airports, convention centers, sports stadiums, and industrial plants, they ensure rapid and safe roof rainwater discharge under extreme rainfall conditions through reliable negative pressure load capacity and integrated electrofusion welded connections.

I Product Features

● Negative pressure load bearing – designed specifically for siphonic systems: During operation, siphonic drainage systems experience negative pressure within pipelines, which conventional drainage fittings cannot withstand. This series of fittings is specifically designed for negative pressure conditions, undergoing rigorous negative pressure testing to ensure stable system operation under full-bore flow. Manufactured using imported raw materials and advanced equipment, they exhibit excellent resistance to slow crack growth and rapid crack propagation.

● Electrofusion connection – integrated system: Using electrofusion jointing technology, the fittings incorporate precision resistance wires and form a fully integrated structure when fused with the pipe. Joint strength exceeds that of the pipe body, fundamentally eliminating the risk of joint leakage under negative pressure conditions. Connections between pipes and roof drains also utilize electrofusion jointing, ensuring overall system sealing integrity.

● Balancing rigidity and flexibility – resistance to negative pressure collapse: Siphonic fittings are manufactured from virgin PE100-grade material, providing sufficient ring stiffness to resist external compression while maintaining excellent toughness to prevent brittleness or cracking. While conventional drainage fittings emphasize resistance to positive pressure, siphonic fittings must resist negative pressure that acts inward from the outside. This product offers adequate rigidity with good toughness, ensuring no collapse or cracking during long-term service, with high resistance to both positive and negative pressures.

● Hydraulic optimization – smooth full-bore flow: The fittings feature smooth inner walls with streamlined flow paths that eliminate stagnant zones. Swept tees, large-radius elbows, and other design features minimize local head losses, ensuring stable full-bore flow conditions within the siphonic system. Drainage efficiency is significantly higher than traditional gravity flow systems. The system utilizes Bernoulli’s principle equations, fully harnessing the energy generated by the height difference between the roof and ground level through precise calculations.

I Product Specification

I Application

● Airport terminal roof drainage: HDPE Drainage Pipes and Fittings are used for rainwater drainage systems on metal or concrete roofs of large airport terminals, addressing drainage challenges for large-span, complex structural roofs.

● Convention centers and sports stadiums: Suitable for large-span steel structure roofs, with flexible placement of roof drains to meet architectural design requirements, offering significant advantages in material savings and reduced construction workload.

● Industrial plants and warehousing logistics: Used for rapid roof rainwater drainage in large factories, warehouses, and logistics centers. Features smaller pipe diameters with no slope requirement, providing aesthetic appeal and space savings.

● Commercial complexes and high-rise podiums: Suitable for rainwater drainage systems on large-area roofs of shopping centers, supermarkets, and podium structures of high-rise buildings.

● Cultural venues: Used in theaters, libraries, museums, and other facilities with high acoustic requirements, where the full-bore flow of siphonic systems produces low noise levels.

I Comparison with Other Drainage Systems

Aspect	Siphonic Drainage System	Conventional Gravity Drainage System
Working Principle	Siphonic roof drain traps air, forming full-bore flow in sealed pipes; siphon effect is generated using potential energy	Water flows naturally into roof drains using roof slope; air-water mixture flows down vertical pipes by gravity
Pipe Flow Condition	Full-bore flow, negative pressure	Partial flow, air-water mixture
Drainage Efficiency	High efficiency, large discharge per drain	Low efficiency
Pipe Diameter Requirement	Smaller pipe diameters	Larger pipe diameters
Slope Requirement	No slope required	1%–3% slope required
Material Consumption	Lower material usage	Higher material usage
Installation Complexity	Simple installation	Complex installation
Space Utilization	Space-saving	Space-consuming
Clogging Resistance	Good	Prone to clogging
Earthwork Excavation	Reduced ground excavation work	Extensive ground excavation

I FAQ

1. What is the difference between HDPE siphonic drainage fittings and ordinary HDPE drainage fittings?

The core differences lie in mechanical stress characteristics and applicable standards. During operation, siphonic drainage systems experience negative pressure (≥ –0.08 MPa) within the pipes, requiring fittings to have adequate rigidity and toughness to resist external compression and prevent collapse or cracking. Ordinary drainage fittings are designed only for gravity flow systems.

2. Why must siphonic drainage systems use specialized fittings?

Conventional drainage fittings emphasize resistance to positive pressure (expansion from inside the pipe outward), while siphonic drainage fittings must resist negative pressure (compression from outside inward). Using ordinary fittings as substitutes may result in pipe collapse, joint leakage, or even system failure when negative pressure increases within the pipeline after siphon formation. Roof siphonic drainage systems must use specialized siphonic fittings that comply with the CJ/T 250-2018 standard.

3. What special design features do siphonic roof drains have?

Polygonal siphonic roof drains feature the following characteristics:

① Achieve stable siphon operation at the lowest water level in the industry;

② Controllable design prevents drainage flow from increasing indefinitely with rainfall, which could cause excessive pipe flow velocity and sharp negative pressure rise;

③ Strictly control drainage capacity within 1.15 times the design drainage rate;

④ Drainage capacity ranges from 1–100 L/s, with various types suitable for different roof configurations.

4. What is the function of the anchoring system in a siphonic system?

The anchoring system consists of square steel, C-shaped steel, connectors, guided pipe clamps, and fixed pipe clamps, serving three main functions:

① Absorbing pipe vibrations to protect the building structure;

② Accommodating thermal expansion and contraction movements to limit thermal stress;

③ Preventing pipe deformation and avoiding sagging or bending of horizontally suspended pipes due to excessive length.

The system allows pre-installation, ensuring safe and convenient operation, significantly reducing installation time and labor costs.

5. What are the advantages of a siphonic system compared to a conventional gravity system?

① High drainage efficiency with large discharge per drain;

② Smaller pipe diameters with no slope requirement, providing aesthetic appeal and space savings;

③ Lower material consumption;

④ Simple installation;

⑤ Reduced ground excavation work;

⑥ Addresses the limitations of conventional gravity systems in meeting modern architectural requirements for aesthetics, construction convenience, increased usable space, and extended service life.

6. How is the crack resistance performance of HDPE siphonic fittings?

Manufactured using imported raw materials and advanced equipment, the fittings exhibit excellent resistance to slow crack growth and rapid crack propagation. The elongation at break is ≥750% (at 23±2°C), ensuring no cracking during long-term service under negative pressure conditions.

I Product Introduction

HDPE same-floor drainage fittings are specialized connection components designed for same-floor drainage systems, manufactured from PE100-grade high-density polyethylene through precision injection molding. HDPE Drainage Pipes and Fittings refers to a building drainage system in which the drainage pipes for sanitary fixtures within a bathroom (including waste horizontal pipes and drainage branch pipes) do not penetrate the floor slab into the space below but are instead installed on the same floor as the sanitary fixtures, connecting to the vertical drainage stack within the same residential unit. The product range covers complete specifications including toilet connectors, multi-function floor drains, swept tees, Sovent fittings, and electrofusion fittings. Widely used in bathroom drainage systems for residential buildings, hotels, hospitals, schools, and other structures, the system embodies the modern drainage concepts of clear ownership, convenient maintenance, and reduced noise through integrated electrofusion welded connections and same-floor installation technology.

I Product Features

● Same-floor installation, clear ownership: Horizontal drainage branch pipes are installed within the owner’s residential unit, allowing pipe maintenance to be conducted on the same floor without disturbing downstairs neighbors. This fundamentally resolves the neighborhood disputes traditionally associated with cross-floor drainage systems that require cooperation from occupants below for repairs.

● Electrofusion connection: Using electrofusion welding technology, the fittings incorporate precision resistance wires and form a fully integrated structure when fused with the pipe. The joint material and structure are identical to the pipe body, achieving seamless integration between fitting and pipe and fundamentally eliminating the risk of leakage.

● Low drainage noise: With a wall thickness of 4.8mm (DN110), combined with sound insulation from the backfill layer, drainage noise is reduced to below 35 decibels. Effectively minimizes flow noise generated during drainage, creating a quieter residential environment.

I Product Specification

HDPE Drainage Pipes

HDPE Drainage Fittings

I Application

● Residential bathroom same-floor drainage: HDPE Drainage Pipes and Fittings are widely used in drainage systems for residential buildings and apartments, enabling same-floor installation and maintenance.

● Hotel guest room drainage: Suitable for hotel guest room bathrooms, avoiding maintenance disruptions to rooms below and enhancing guest experience.

● Hospital ward drainage: Used in hospital inpatient department bathrooms, reducing drainage noise and ensuring patient rest quality.

● School dormitory drainage: Suitable for student apartments and dormitory bathrooms, reducing management challenges associated with pipe blockage repairs.

● LOFT apartments and commercial spaces: Particularly suitable for LOFT apartments, hotels, and other scenarios with sensitivity to floor height, enabling zero-slab-drop bathroom design and improving space utilization.

● High-end finished residences: Meets developers’ needs for diversified bathroom layouts, enhancing property value.

I Comparison

Aspect	HDPE Same-Floor Drainage System	Traditional Cross-Floor Drainage System
Pipe Installation Location	Horizontal branch pipes installed on the same floor, no floor penetration	Horizontal branch pipes penetrate the floor, occupying space below
Ownership	Clear ownership, maintenance conducted on the same floor	Pipes located on the floor below, maintenance requires cooperation from downstairs occupants
Maintenance Convenience	Maintenance can be performed on the same floor without disturbing neighbors	Requires entry into downstairs residential units for repairs
Bathroom Layout	No restrictions on sanitary fixture placement, allowing flexible layout	Restricted by reserved floor penetration locations, limiting layout flexibility
Noise Impact	Pipes covered by backfill layer, resulting in low noise	Pipes located within ceiling of floor below, noise affects downstairs occupants
Leakage Risk	No pipe penetrations through floor slab, low leakage probability	Improper waterproofing at pipe penetrations can easily lead to leakage
Trap Configuration	No P-traps or S-traps required; replaced by specialized fittings	Requires P-traps or S-traps; water seals are prone to failure
Ceiling Requirement	No need for bathroom ceiling, maximizing floor height utilization	Requires ceiling to conceal pipes, reducing floor height

I FAQ

1. What is same-floor drainage, and what is the difference from traditional cross-floor drainage?

Same-floor drainage refers to a building drainage system in which the drainage pipes for sanitary fixtures within a bathroom do not penetrate the floor slab into the space below but are instead installed on the same floor as the sanitary fixtures, connecting to the vertical drainage stack within the same residential unit. Compared to traditional cross-floor drainage, same-floor drainage offers significant advantages including clear ownership (maintenance conducted on the same floor), flexible bathroom layout, no noise interference, and lower leakage probability.

2. What are the core types of HDPE same-floor drainage fittings?

Core fittings include:

● Toilet connector: Replaces traditional P-traps/S-traps, connecting directly to horizontal branch pipes

● Multi-function floor drain: Deep water seal design for effective odor prevention

● Swept tee: Branch connection

● Sovent fitting: Air-water mixing device that controls the air-water mixture ratio in vertical stacks

● Multi-channel adapter: Can simultaneously connect multiple branch pipes

● Concealed cistern components: Used with wall-hung toilets

3. What are the main installation methods for same-floor drainage?

There are two main methods:

● Slab-drop method (recessed floor): Uses structural slab depression (typically about 250mm) to install pipes within the sunken space

● Wall-mounted method (false wall): Constructs a false wall behind fixtures (approximately 0.2m wide) as dedicated pipe space, requiring wall-hung fixtures and rear-discharge toilets

4. What jointing methods are used for HDPE same-floor drainage fittings, and how is leak-proof performance ensured?

The main methods include electrofusion connection, socket fusion connection, and flexible push-on connection (EPDM rubber gasket with compression cap tightening). Electrofusion connection fuses the fitting and pipe into an integrated structure, with joint strength exceeding that of the pipe body, fundamentally eliminating leakage. Flexible push-on connections use thickened EPDM rubber gaskets to create a dual seal, replacing traditional expansion joints.

5. What is the service life of HDPE same-floor drainage systems?

HDPE same-floor drainage fittings manufactured from PE100-grade compound materials have a design service life exceeding 70 years. They exhibit excellent corrosion resistance, capable of withstanding acid and alkaline media with pH values ranging from 2 to 12. With an inner wall roughness coefficient of only 0.004–0.007, they resist scaling during long-term operation, resulting in minimal reduction in flow capacity.

6. How much noise reduction can HDPE same-floor drainage systems achieve?

HDPE pipes themselves offer good sound insulation performance. The DN110 pipe has a wall thickness of 4.8mm, which, combined with sound insulation from the backfill layer, reduces drainage noise to below 35 decibels. Compared to the noise level of traditional PVC drainage pipes (approximately 45–50 decibels), the noise reduction effect is significant, effectively creating a quieter residential environment.

7. What requirements does wall-mounted same-floor drainage have for sanitary fixtures?

Wall-mounted same-floor drainage requires wall-hung washbasins and rear-discharge toilets. Wall-hung, rear-discharge fixtures utilize concealed installation systems, with concealed support frames constructed of lightweight steel having adequate strength and rigidity. Concealed cisterns are installed within false walls, with the flush plate also serving as the access point for maintenance.