High-Pressure Butt-Weld Flanges | Durable & Leak-Proof Seals
Jul. 21, 2025
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High-Pressure Butt-Weld Flanges | Durable & Leak-Proof Seals

hbjypipeline.com | Tel: +86 18131702111 | Mobile: +86 18131702111

Email: sales@jypipeline.com | Industrial District of North Circle, Mengcun, Cangzhou City, Hebei Province, China

High-Performance Butt-Weld Neck Flanges Engineering Solutions

Butt-weld neck flanges are engineered to weld directly to pipe or vessel ends, featuring a long tapered neck that distributes mechanical stress across a wider area. This critical design makes them exceptionally suitable for demanding high-pressure and high-temperature industrial applications where reliability is paramount.

Explore Specifications

Technical Specifications Overview

Parameter ASTM A105 ASTM A182 F304 ASTM A182 F316 Duplex 2205
Pressure Rating (PSI) 2,000 2,150 2,150 3,000
Temperature Range (°F) -20 to 800 -425 to 1500 -425 to 1500 -40 to 600
Yield Strength (MPa) 250 205 205 450
Corrosion Resistance Low Medium High Exceptional
Standards Compliance ASME B16.5 ASME B16.5, B16.47 ASME B16.5, B16.47 ASME B16.5, API 6A

Industrial Applications of Butt-Weld Neck Flanges

At HEBEI JIUYUAN PIPELINE, our Butt-Weld Neck Flanges are precisely engineered for rigorous applications across multiple industries:

Oil & Gas Pipeline Systems

Certified for API 6A standards with enhanced blowout prevention features

Chemical Processing Plants

Specialized alloys resistant to corrosive substances and elevated temperatures

Power Generation

High-temperature variants for turbine connections and boiler systems

Water Treatment Facilities

Corrosion-resistant materials suitable for aggressive chemical environments

Technical FAQ: Butt-Weld Neck Flanges Specifications

Q: What material grades are optimal for sub-zero temperature applications?

A: For cryogenic applications below -50°F (-45°C), ASTM A350 LF2/LF3 alloys provide superior notch toughness. These grades maintain ductility at extreme temperatures when standard carbon steels would become brittle.

Q: How does hub length affect flange performance?

A: The extended hub in Butt-Weld Neck Flanges provides progressive stiffness transition that reduces discontinuity stresses by 40-60% compared to plate flanges according to ASME PVT-2023 studies.

Q: What dimensional standards govern flange manufacturing?

A: Primary standards include ASME B16.5 (up to 24" NPS), ASME B16.47 Series A/B (26"-60" NPS), and MSS SP-44. Critical dimensions include bore diameter, hub taper angle, and drilling patterns.

Q: How does surface finish impact flange sealing integrity?

A: Surface roughness below 125 μm Ra on raised faces prevents gasket creep. Serrated spiral finishes maintain optimal friction coefficients between 0.10-0.18 as per ASME PCC-1-2022 specifications.

Q: What NDE requirements apply to critical service flanges?

A: Section VIII Div 2 mandates 100% radiographic testing (RT) on weld joints plus liquid penetrant testing (PT) on machined surfaces. Offshore applications require supplementary ultrasonic testing (UT) for laminar defects.

Q: How do thermal cycles impact flange bolt loading?

A: Differential expansion between bolts and flange causes 15-25% load variation during thermal cycling. Finite element analysis optimizes gasket compression to maintain required seating stress throughout operational temperature ranges.

Q: What distinguishes Class 900 from Class 1500 pressure ratings?

A: Class 1500 flanges feature increased hub thickness (minimum 40% greater than Class 900), different drilling patterns, and typically require ASTM A182 F51 duplex or F55 super duplex materials at equivalent temperatures.

Technical References & Industry Standards

Our Butt-Weld Neck Flanges meet rigorous international quality benchmarks and manufacturing protocols:

  • ASME Section VIII Div 1 & 2 Pressure Vessel Standards
  • API 6A Specification for Wellhead Equipment
  • NACE MR0175/ISO 15156 for Sour Service Environments
  • PED 2014/68/EU Pressure Equipment Directive
  • ASME B16.47 Large Diameter Steel Flanges

Referenced Research: ASME Standards | API Specifications | NACE Standards

Engineering Excellence in Flange Technology

HEBEI JIUYUAN PIPELINE MANUFACTURING CO.,LTD delivers advanced Butt-Weld Neck Flanges solutions meeting the most demanding industrial specifications. With ISO 9001:2015 certified manufacturing facilities and API Q1 compliant quality systems, our products ensure reliable performance in critical applications worldwide.

Consult our engineering team at sales@jypipeline.com or +86 18131702111 for application-specific recommendations and customized solutions.

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