Short Neck HDPE Flange Adaptor for Cold Water

Product Overview

The Short Neck HDPE Flange Adaptor for Cold Water is a compact transition fitting designed to connect HDPE pipes to flange-ended components in cold water distribution systems. Manufactured from PE100 grade HDPE with a molded carbon steel flange (hot-dip galvanized for corrosion resistance), this adaptor provides a secure interface between fusion-welded HDPE pipelines and flanged valves, pumps, or storage tanks. Compliant with EN 12201-1:2024 for pressure piping, it maintains a PN16 pressure rating (16 bar at 20°C) while occupying 30% less axial space than standard long-neck flange adaptors—critical for installation in confined spaces. The short neck design minimizes pressure loss across the transition, ensuring hydraulic efficiency in municipal water mains, industrial process lines, and commercial cold water systems. Its service life exceeds 50 years in buried and above-ground installations, outperforming metal adaptors prone to corrosion .

Product Features

Space-Efficient Design

The short neck configuration reduces overall length by 40% compared to conventional flange adaptors, making it ideal for retrofits in existing pipe trenches and tight mechanical rooms. The integrated neck features a gradual diameter transition that minimizes turbulence, with pressure loss coefficients (K-value) of less than 0.2—superior to abrupt flange connections. Precision machining ensures flange face flatness within 0.1mm/m, guaranteeing proper gasket seating.

Secure Connection Technology

The adaptor features a triple-seal system: an HDPE-to-flange fusion bond, an EPDM gasket between flange faces, and an O-ring seal at the neck base. This redundant sealing design eliminates leakage paths, even under pressure fluctuations and pipe movement. The galvanized steel flange includes drilled holes compatible with ANSI B16.5 and DIN 2501 standards, ensuring compatibility with global flange specifications.

Pressure and Compatibility Performance

Rated for 16 bar working pressure at 20°C (cold water service), the adaptor maintains integrity in temperature ranges from -20°C to 40°C. The PE100 HDPE neck is compatible with both PE80 and PE100 pipes via butt fusion or electrofusion, while the flange face accepts standard gaskets (EPDM, NBR, or PTFE) for compatibility with various system fluids. The assembly withstands axial thrust forces up to 25 kN, preventing flange separation under surge conditions.

Applications

This compact flange adaptor solves transition challenges in cold water systems:

• Municipal Water Mains: Connects HDPE distribution lines to flanged valves, meters, and pump stations in urban water networks.

• Industrial Facilities: Transitions between HDPE process lines and flanged equipment in food processing, pharmaceutical, and manufacturing plants.

• Commercial Buildings: Links HDPE riser pipes to flanged connections in cooling systems, chiller loops, and cold water storage tanks.

• Water Treatment Plants: Adapts HDPE membrane filtration lines to flanged control valves and monitoring equipment .

FAQ

Why choose a short neck design over standard flange adaptors?

The short neck configuration saves critical space in confined installations while reducing pressure loss across the transition, making it ideal for retrofits and tight mechanical rooms .

What flange standards does it compatible with?

The adaptor is available with flanges drilled to ANSI B16.5 (Class 150) and DIN 2501 (PN16) standards, ensuring compatibility with global piping systems. Custom drilling patterns are available upon request.

How is it installed to ensure leak-free performance?

The HDPE neck is fused to the pipe using butt fusion (sizes ≥63mm) or electrofusion (sizes ≤63mm), then the flange is bolted to the mating flange with uniform torque application (35-40 Nm for M16 bolts).

Is it suitable for drinking water systems?

Yes. The PE100 HDPE meets EN 12201-1 requirements for potable water contact, while the galvanized flange is coated with food-grade epoxy to prevent contamination.