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Weld Neck Flange features a long tapered hub smoothly transitioning to the pipe wall. It is connected to pipes via full penetration butt welds. The tapered hub disperses stress concentration at the weld joint, delivering superior fatigue resistance, structural strength and sealing reliability. It is the preferred flange for critical piping systems.
Service Conditions & Application Scenarios
Working Environment Conditions
✅ High temperature & high pressure piping
✅ Cryogenic / low temperature service (LNG, liquid nitrogen)
✅ Frequent thermal cycling, vibration and alternating fatigue load
✅ Systems requiring strict anti-leakage performance
Industrial Applications
Oil & Gas Industry Offshore platforms, onshore refineries, crude oil & natural gas transmission pipelines, wellhead piping, sour gas service (compliant with NACE MR0175).
Petrochemical & Chemical Plants Reactor piping, high-pressure synthesis loops, acid & alkali medium pipelines, hydrogen process piping.
Power Generation Thermal power, ultra-supercritical units, main steam pipeline, high-pressure feedwater systems, waste heat recovery piping.
LNG & Cryogenic Engineering LNG receiving stations, cryogenic storage and transport pipelines, liquid gas low-temperature piping.
Pharmaceutical & New Energy High-purity process pipelines, hydrogen energy transmission systems, battery chemical production lines.
Water Treatment & Heavy Industry Large-scale industrial desalination, high-pressure circulating water systems, metallurgical high-temperature medium pipelines.
Applicable International Standards
Dimensional Standards
ASME B16.5 Pipe Flanges and Flanged Fittings (NPS 1/2" ~ NPS 24"; Class 150 ~ 2500)
ASME B16.47 Large Diameter Steel Flanges (NPS 26" ~ NPS 60; Series A / Series B)
EN 1092-1 Steel flanges for piping systems (PN6 ~ PN400, European metric system)
JIS B2220 Japanese standard steel pipe flanges
GB/T 9115, HG/T 20592, HG/T 20615 Chinese industrial standards
Material Forging Standards
ASTM A105: Carbon steel flanges for ambient & higher temperature service
Best Alloy Engineering Alloy Pipe as s a reference point for excellence in the manufacture and distribution of fittings, piping, bends, forged flanges , clad products and specialties for the upstream, midstream and downstream sectors of oil & gas, thermal and nuclear power generation.
The C...
Best Alloy Engineering Alloy Pipe as s a reference point for excellence in the manufacture and distribution of fittings, piping, bends, forged flanges , clad products and specialties for the upstream, midstream and downstream sectors of oil & gas, thermal and nuclear power generation.
The C...
