HDPE Butt Fusion Rainwater Hopper for Siphonic Drainage

A rainwater hopper manufactured from high-density polyethylene, used for collecting and directing roof rainwater in siphonic drainage systems.

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Category: HDPE Siphonic Fittings

HDPE Siphonic Fittings

Product Overview

A rainwater hopper manufactured from high-density polyethylene, used for collecting and directing roof rainwater in siphonic drainage systems. This HDPE rainwater hopper collects roof runoff through a debris-screening grille and discharges it into siphonic stacks at full bore, cutting the number of downpipes needed on large roofs. Built to ISO 8770, EN 1519-1 and CJ/T 245 for DN 50 to 315 mm systems.

Quick Information

Diameter Range: DN 50 - 315 mm
Applicable Standards: ISO 8770, EN 1519-1, CJ/T 245
Stock: In stock

Specification Table

Article	d1/d2	K	k1	k2	k3	D1	D2	L
Roof Outlet	56.8	197.0	56.0	126.0	114.5	224.0	245.0	3.4
Roof Outlet	75.2	194.0	56.0	124.0	112.5	224.0	245.0	4.0
Roof Outlet	90	197.0	56.0	124.0	112.5	224.0	245.0	4.2
Roof Outlet	110.5	192.0	56.0	121.0	109.5	224.0	245.0	6.2
Roof Outlet	125.6	168.0	56.0	93.0	85.0	211.0	221.0	6.1

Key Features

High-Capacity Collection: The HDPE rainwater hopper gathers roof runoff over a wide catchment and feeds it to siphonic stacks without ponding.
Rapid Siphonic Priming: This siphonic rainwater hopper is shaped to purge air fast, so full-bore siphonic flow establishes within seconds of a storm peak.
PE100 Weather Resistance: The HDPE rainwater hopper resists UV, frost, thermal cycling and rooftop chemicals for decades of maintenance-free service.
Debris-Screening Grille: A removable grille on this siphonic rainwater hopper blocks leaves and gravel, protecting the stack from blockage.
Leak-Free Fusion Joints: The HDPE rainwater hopper welds to HDPE pipe by butt or socket fusion, forming a homogeneous watertight system.
Wide Size Range: This siphonic rainwater hopper covers DN 50 to 315 mm to match any siphonic roof drainage design.

Production

Raw Material

Every HDPE rainwater hopper is molded from certified virgin PE100 resin with carbon black UV stabilizer, batch-tested for melt flow rate and density.

Molding Process

Each siphonic rainwater hopper is injection molded with precision cores that form the collection bowl, grille seat and outlet socket in one cycle, holding dimensional tolerance within 0.1 mm.

Quality Control

Batches of HDPE rainwater hoppers are sampled for hydraulic flow testing, dimensional gauging and fusion joint integrity per ISO 8770 and EN 1519-1.

Applications

Large flat roofs on malls, airports and stadiums use the HDPE rainwater hopper for high-capacity storm drainage.
Siphonic roof drainage systems on factories and warehouses rely on this siphonic rainwater hopper to minimize downpipe count.
High-rise buildings install the HDPE rainwater hopper to drain roof terraces quickly during design storms.
Rainwater harvesting networks choose this siphonic rainwater hopper to deliver screened runoff to storage tanks.