Shanxi Xinshunda Flange Manufacturing Co., Ltd. delivers the Class 2500 Orifice Flange, an ultra-high-pressure specialized component engineered for the most severe flow measurement environments in the energy sector. Unlike standard ASME B16.36 flanges which top out at Class 2500 only in limited sizes, true Class 2500 Orifice Flanges are predominantly manufactured to API 6A and ASME B16.34 standards, designed to withstand working pressures up to 6,000 psi (414 bar) and often higher in specific alloy configurations. With nearly two decades of advanced vacuum-melt forging and precision machining expertise, we provide these critical safety components for deep-well exploration, high-pressure gas injection, and subsea production systems where failure is not an option.
Advanced Engineering for Ultra-High Pressure (UHP)
The Class 2500 Orifice Flange represents the apex of flange engineering, requiring massive structural integrity and flawless material homogeneity to contain extreme internal forces.
- API 6A Compliance: While ASME B16.36 defines Class 2500 for smaller diameters, our Class 2500 Orifice Flanges are typically built to API 6A Specification for wellhead and Christmas tree equipment. This ensures compatibility with global wellhead systems and adherence to stricter testing protocols (PSL 3/4).
- Ring Type Joint (RTJ) Mandatory: At 6,000+ psi, Raised Face (RF) seals are obsolete. Our Class 2500 Orifice Flanges exclusively feature Ring Type Joint (RTJ) grooves, utilizing high-strength oval (R-series) or pressure-energized octagonal (RX/BX-series) ring gaskets. The BX-series, in particular, is standard for Class 2500, providing a metal-to-metal seal that tightens as internal pressure increases.
- Precision UHP Orifice Taps: Drilling taps into the massive hubs of a Class 2500 Orifice Flange requires state-of-the-art gun-drilling technology. We ensure taps are perfectly perpendicular to the bore and deburred to microscopic tolerances to prevent turbulence or stress concentration points that could lead to fatigue cracking under cyclic high-pressure loading.
- Reinforced Jack Screw Systems: The bolt loads required to seal a Class 2500 Orifice Flange are immense (often requiring hydraulic torque wrenches). We integrate oversized, hardened alloy steel jack screws with reinforced bosses, allowing for the safe, controlled separation of flange faces without risking damage to the critical RTJ sealing surfaces or endangering personnel.
- Exotic Material Grades: To withstand sour service (H2S), high temperatures, and corrosive CO2 environments common at these pressures, we manufacture Class 2500 Orifice Flanges in Carbon Steel (A105/A350 LF2), Stainless Steels (F316/F316L), Duplex/Super Duplex (F51/F53/F55/F57), and Nickel Alloys (Inconel 625/718, Hastelloy C276).
Strategic Applications in Extreme Environments
The Class 2500 Orifice Flange is reserved for the most critical and hazardous flow measurement points in the industry:
- Deep-Water & Ultra-Deep-Water Subsea: Essential for subsea trees, manifolds, and jumpers where reservoir pressures can exceed 5,000–10,000 psi. The compact yet robust design of the Class 2500 Orifice Flange minimizes footprint while maximizing safety.
- High-Pressure Gas Injection (EOR): Used in CO2 and natural gas injection wells for Enhanced Oil Recovery, where injection pressures must overcome deep reservoir resistance.
- Sour Gas Wellheads: Critical for Christmas tree assemblies in fields with high H2S content, requiring NACE MR0175/MR0103 compliant materials to prevent sulfide stress cracking (SSC) under extreme stress.
- Hydrogen Energy Infrastructure: As the industry moves toward high-pressure hydrogen storage and transport (700 bar+), the Class 2500 Orifice Flange is becoming a key component for metering and safety isolation in hydrogen refueling stations and pipeline networks.
- Geothermal Supercritical Systems: Deployed in next-generation geothermal plants accessing supercritical fluids at extreme depths, pressures, and temperatures.
Uncompromising Quality Assurance & PSL Levels
Manufacturing a Class 2500 Orifice Flange demands the highest level of quality control, often adhering to API 6A Product Specification Levels (PSL 3G or 4G).
- 100% Ultrasonic Testing (UT): Every inch of the forging undergoes rigorous UT per ASTM A388/A577 to detect any internal laminations, inclusions, or voids. For PSL 4, acceptance criteria are exceptionally strict.
- Advanced NDT Suite: In addition to UT, all Class 2500 Orifice Flanges undergo 100% Magnetic Particle (MT) and Liquid Penetrant (PT) inspection on all machined surfaces and bores to ensure zero surface defects.
- Hardness & Impact Testing: Comprehensive Charpy V-Notch impact testing at low temperatures and hardness mapping across the entire cross-section are performed to verify resistance to brittle fracture and sulfide stress cracking.
- Full Traceability & Certification: We provide full EN 10204 3.2 certification, including heat treatment charts, chemical analysis, mechanical test results, and NDT reports. For API 6A orders, we supply full PSL documentation packages traceable to the original melt.
- Hyper-Pressure Testing: Units are hydrostatically tested to 1.5x working pressure (9,000 psi+) and often subjected to gas testing per API 6A requirements to validate leak-tight integrity of the RTJ seal.
Specialized Heavy-Lift Logistics & Packaging
Given the extreme weight and critical nature of Class 2500 Orifice Flanges, our logistics protocol is military-grade.
- Protective Assembly: Flange pairs are shipped pre-assembled with custom-machined steel spacers and protective RTJ groove covers to prevent any deformation or damage during transit.
- Corrosion Protection: Units are coated with heavy-duty, long-term corrosion inhibitors, wrapped in multi-layer VCI paper, and sealed in moisture-barrier bags before being placed in reinforced, steel-strapped wooden crates with shock-absorbing bases.
- Documentation Integrity: A waterproof, tamper-evident documentation tube containing all MTCs, NDT reports, and dimensional inspection certificates travels with each shipment to ensure immediate verification upon arrival at remote well sites or offshore platforms.
Partner with Shanxi Xinshunda for Ultimate Pressure Safety
Choosing Shanxi Xinshunda for your Class 2500 Orifice Flange needs ensures access to a manufacturer capable of meeting the stringent demands of API 6A and extreme service conditions. We specialize in PSL 3/4 manufacturing, sour service compliance, and custom alloy solutions for the world's toughest environments. Whether for a deep-water subsea project or a high-pressure hydrogen initiative, our Class 2500 Orifice Flanges deliver the absolute reliability, precision, and safety your operations require. Contact our specialized high-pressure division today for technical consultation, API 6A catalogs, and competitive quotations.
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