The Siphon Roof Rainwater Drainage System utilizes siphon rainwater outlets that isolate air and precise hydraulic

balance calculations of the pipes. lt relies on the potential energy of the building to form full pipe flow through

a sealed pipe system, creating a siphon effect that quickly discharges rainwater from the roof to the rainwater

well.

The siphon roof rainwater drainage system is one of the most advanced roof rainwater drainage systems internationally,

with nearly 40 years of history. It is widely used in large factories, exhibition halls, airports, stadiums, and high-rise

building complexes with large spans and complex structures.

Due to modern design considerations that prioritize the aesthetics of buildings, ease of construction, increased

usable area, and extended lifespan, traditional gravity-based rainwater systems are increasingly unable to meet

the evolving design concepts. The siphon rainwater system, which addresses design challenges that traditional

gravity systems cannot, also offers unparalleled advantages in material savings and reduced construction volume.

SIPHON DRAINAGE CONCEPT

Siphon Roof Drainage System

Siphon Rainwater Drainage

System

Efficient Drainage

Smaller Pipe Diameter: No need for slopes, aesthetically

pleasing, and space-saving

Less Material: Reduced ground excavation work

System Advantages

System Disadvantages

Traditional Gravity-Based

Rainwater drainage system

Inefficient Drainage

Large Pipe Diameter: Requires a 1%-3% slope

High Material Usage: Complex installation

Space Waste

Prone to Blockages

Extensive Ground Excavation

System Principle

The Rainbow Attracts The Type Roofing

Rain Water Emission

At the beginning of a rainfall, the system uses gravity to drain

the water, As the rainfall increases and the water level on the

roof reaches a certain height, the rainwater outlet automatically

cuts off the air, creating a siphon. The system then transforms

into an efficient drainage system, suctioning and discharging

the rainwater downward.

Its principle relies on the slope of the roof structure, allowing

water to naturally flow into the roof rainwater outlets. The

water, in a mixed air-water state, then relies on gravity to flow

down the vertical pipes.

A siphon roof rainwater drainage system utilizes

the \" Bernoulli's Principle\" equation.

Through meticulous calculations, it takes full

advantage of the energy generated by the

height difference between the roof and the

ground to create a siphon effect. The system

rapidly discharges rainwater under full-flow

conditions.

Rainwater lnlet

comprehensive system

components

Polygon Rainwater Inlet requires the lowest water level in the industry to achieve a

stable siphon state. The Polygon Rainwater Inlet is a controllable siphon rainwater

inlet that prevents the drainage flow from increasing infinitely with the rainfall,which

would otherwise cause excessive water flow velocity in the pipes, a sharp rise in negative

pressure, and system failure.

The Polygon Rainwater Inlet strictly controls the drainage capacity within 1.15 times

the design drainage capacity. The drainage capacity ranges from 1 L/s to 100 L/s,

offering various types suitable for different roof types.

Rainwater Outlet Structure

Cast Aluminum

Air Baffle

Stainless Steel

Clamping Ring

Stainless Steel Base

Short Pipe

Diameter（mm）

56-63 35 12

75-90 55 25

Water Depth

Before inlet（mm）

Design Drainage

Capacity（L/S）

110-125 85 80

125-160 110 100

The Rainbow Attracts The Type Roofing

Rain Water Emission

Siphon Hope pipe system

HDPE pipe features

Comprehensive system components:

Leak-Proof

High Toughness

Excellent Flexibility

Good Scratch Resistance

Strong Resistance to Rapid Crack Propagation

Long Lifespan

High Resistance to Positive and Negative Pressure

Polygon's siphon HDPE (High-Density Polyethylene) pipes are exceptional, eco-friendly drainage

materials. They have become the top choice for roof rainwater drainage and indoor wastewater

systems in developed European countries and are also listed as one of the primary recommended

materials in the \"Technical Specification for Siphon Roof Rainwater Drainage Systems.\" Polygon's

siphon HDPE pipes are made using imported raw materials and advanced equipment, offering

excellent resistance to slow crack growth, rapid crack propagation, aging, and corrosion.

Compared to traditional materials, HDPE pipe systems have the following advantages:

1 Excellent Crack Resistance: Capable of withstanding slow crack growth and rapid crack propagation.

2 Durability: Resistant to aging and corrosion.

3 Environmental Friendliness: Eco-friendly material that supports sustainable building practices.

These benefits make HDPE pipes a superior choice for modern drainage systems.

Outstanding Corrosion

Resistance

The Rainbow Attracts The Type Roofing

Rain Water Emission

Fastening System

Comprehensive System

Components

The Rainbow Attracts The Type Roofing

Rain Water Emission

System Components

Absorption of Pipe Vibrations

The fastening system of the Polygon Siphon Roof Rainwater

Drainage System consists of square steel, C-shaped steel,

connectors, guides, and anchoring pipe clamps. Unlike traditional

pipe fixation systems, Polygon's fastening system can be

pre-installed, ensuring safe and easy operation while significantly

reducing installation time and labor costs.

During the siphon drainage process, highspeed

fluid flow can cause intense vibrations. The

fastening system effectively absorbs and

reduces these vibrations, thus protecting the

building structure.

Square Steel and C-shaped Steel

Polygon's fastening system uses

high-quality stee, with double-layer

hot-dip galvanization inside and out,

meeting the national level ten

antimicrobial requirements (72-hour salt

spray test).

Guide Pipe Clamps

Exclusively designed by Polygon, these

guide pipe clamps meet national level

ten anti-corrosion requirements

(72-hour salt spray test) and can fully

support the weight of the pipes when

they are filled with water.

Absorption of Thermal Expansion

and contraction Displacement

The fastening system effectively limits the

thermal stress in drainage pipes caused by

thermal expansion and contraction, ensuring

the system operates more safely and stably.

Anchoring Pipe Clamps

Also exclusively designed by Polygon,

these anchoring pipe clamps meet national

level ten anti-corrosion requirements

(72-hour salt spray test) They effectively

Preventing Pipe Deformation Due

to Suspension Stress

In projects with very large spans, the fastening

system can also prevent pipes from deforming

due to prolonged bending, which occurs when

horizontal suspended pipes are very long.

Advantages of the Fastening system

By installing the fastening system, siphon pipes do not need

to be directly connected to the roof, greatly redueing the

number of contact points with the roof or floors. Polygon's

fastening syslem is custem-designed for professional siphon

drainage systems based on the folo'wing factors.

counteract the internal stress in caused by temperature

changes. When pipes combined with Polygon's proprietary

welded rings or double flange connections, these clamps can

effectively overcome the expansion and contraction of pipes

due to environmental temperature changes, efficient ensuring

more stable system and operation.

HDPE

Siphon Rainwater

Drainage System Fittings

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