When engineering high-volume custody transfer networks, chemical refineries, or steam generation plants, real-time fluid measurement requires extreme stability and absolute dimensional accuracy. Serving as a premier manufacturing entity, we forge and precision-machine heavy-duty Orifice Flanges designed specifically to measure flow rates using differential pressure principles. An orifice flange assembly is not a standard mating plate; it is a highly specialized connection point fabricated in pairs, featuring built-in, precision-drilled differential pressure "tapping" holes machined directly into the flange ring.
By utilizing premium certified material grades—such as austenitic stainless steel, carbon steel, and specialized alloy steels—our orifice flanges maintain flat parallel alignment and compress sealing gaskets with absolute uniformity. They are bolted together around an orifice plate and carrier ring assembly, creating a deliberate restriction in the fluid stream that generates a highly predictable pressure drop. This allows downstream flow transmitters to monitor flow rates without structural warping or joint separation under intense high-pressure conditions.
Our heavy manufacturing facility in Mumbai leverages state-of-the-art technological infrastructure to transform raw, certified steel and alloy billets into high-yield orifice components. We utilize closed-die and open-die hydraulic forging presses capable of handling demanding industrial tonnage requirements. The hot-forging process physically re-aligns the internal micro-grain flow of the steel along the contour of the flange ring. This grain modification provides significantly higher impact strength, shear tolerance, and fatigue resistance compared to standard plate-cut or cast alternatives.
Following the forging phase, all blanks undergo automated heat treatment—such as normalizing for carbon steel or solution annealing for stainless variants—to fully relieve internal thermal stresses and optimize structural homogeneity. Our precision machine shop features high-speed CNC turning centers and automated multi-spindle drilling rigs. This setup allows us to execute precise bore machining, bolt-hole tapping, and spot-facing with tolerances down to the micron level, ensuring complete compliance with global engineering specifications.
To meet the strict safety regulations of high-pressure process industries, every production batch goes through comprehensive destructive and non-destructive testing (NDT) protocols. Our internal quality control laboratory is managed by certified professionals who perform 100% Positive Material Identification (PMI) using X-ray fluorescence (XRF) and optical emission spectrometers to guarantee chemical grade authenticity before any metal enters production.
Because the accuracy of the downstream flow instrumentation depends entirely on the location of the pressure readings, tap-hole machining precision is critical. Our quality inspectors evaluate the exact angular orientation and alignment of the 1/2" NPT or socket-weld tapping holes using advanced coordinate measuring machines (CMM). This ensures the readings are taken precisely 1 inch from the flange face, fully adhering to international standards like ASME B16.36. Surface integrity is further verified using liquid dye penetrant testing (LPT) and magnetic particle inspection (MPI).
The industrial operational lifespan of a heavy-duty orifice flange assembly is determined by its specific metallurgical composition and the precision of its sealing face machining.
Industrial piping requirements demand a broad spectrum of material grades to cope with varying chemical and thermal stresses. Our production includes standard Carbon Steels (ASTM A105, A350 LF2) providing high-tensile properties for low-to-moderate temperature utility networks, and High-Yield Carbon Steels (ASTM A694 F52-F70) for high-pressure long-distance transmission lines. For corrosive or high-temperature lines, we process Austenitic Stainless Steels (304/304L, 316/316L) which rely on a self-healing chromium-oxide film to resist environmental attack. Pressure taps are typically supplied with dual 1/2" NPT connections on each side, complete with plug-seals for lines not actively connected to differential meters.
Equally critical is the dimensional machining of the sealing face. When tightening a flanged connection, the mating surfaces must compress the gasket with complete uniformity. Our specialized CNC turning centers machine precise phonographic or concentric serrations into the Raised Face (RF) or Flat Face (FF) profiles, maintaining a strict 125–250 micro-inch AARH (Arithmetic Average Roughness Height) surface finish. For extreme pressure classes, we machine high-precision Ring Type Joint (RTJ) grooves, forcing the gasket material to cold-flow directly into the micro-grooves, creating an impenetrable, leak-proof barrier capable of containing Class 300# to Class 2500# process streams.
To facilitate effortless inline calibration and transmitter integration, our orifice flange assemblies are supplied as complete kits featuring distinct mechanical hardware:
Our production engineering strictly follows global dimensional codes to ensure hassle-free integration with global piping infrastructure.
| Parameter | Specification Details |
|---|---|
| Design Standards | ASME B16.36 (Governing standard for Orifice Flanges), ASME B16.5, DIN, EN 1092-1 |
| Tap Specifications | Dual 1/2" NPT or Socket Weld connections per flange, spaced at 180° orientations |
| Material Carbon & High-Yield | ASTM A105, ASTM A350 LF2 Class 1/2, ASTM A694 F52, F60, F65, F70 |
| Material Stainless & Alloy | ASTM A182 F304/304L, F316/316L, F321, F11, F22, F91, Duplex F51/F60 |
| Pressure Classes | Class 300, 600, 900, 1500, 2500 LBS (Note: Orifice flanges start at Class 300 per ASME B16.36) |
| Facing Types | Raised Face (RF), Ring Type Joint (RTJ) |
| Size Range | 1" NB to 24" NB (Custom larger sizes available on engineering drawing verification) |
For global engineering, procurement, and construction (EPC) firms managing large-scale industrial projects, handling thousands of pipeline connections is a complex logistical task. Partnering with a dedicated distribution channel in Mumbai gives you a distinct operational edge.
We provide volume-based commercial discounts, comprehensive material traceability certifications (MTC EN 10204 3.1/3.2), and durable, sea-worthy packaging designed to prevent edge dents, face scratches, or tap-hole thread cross-threading during transport. Additionally, our sales engineers provide direct technical support to procurement teams, verifying bolt-circle dimensions, pressure-temperature ratings, and tap configurations to match project isometric data perfectly.
Our focus on precision machining and zero-defect forging has earned strong international trust. Operating from the export hub of Mumbai, we regularly ship high-reliability orifice flange assemblies to natural gas extraction platforms in the Middle East, high-load power generation loops in Europe, and downstream processing refineries across Southeast Asia.
Every export order passes through a strict final quality checkpoint, including full dimensional analysis, pressure tap placement checks, and 100% PMI validation. We package shipments in heavy-duty, export-grade wooden cases equipped with moisture-resistant barriers and tailored face protectors. This ensures your components arrive at the project site ready for immediate installation.
| Orifice Flanges – Technical Specifications | Details |
|---|---|
| Size Range | 1" to 24" (DN 25 to DN 600) as per ASME B16.36 |
| Pressure Class | 300 / 600 / 900 / 1500 / 2500 LBS |
| Hardware Kits | Supplied with Jackscrews, Heavy Hex Bolts/Studs, Gaskets, and Tapping Plugs |
| Face Type | RF (Serrated or Smooth), RTJ (Ring Groove) |
| Manufacturing Process | Hot Forged / Precision Machined & Multi-Stage Tap Drilled |
| Testing Protocols | Hydrostatic, PMI, CMM Tap Alignment Verification, Hardness, Ultrasonic, Liquid Penetrant |
| Certification | EN 10204 3.1 / 3.2 Mill Test Certificate, Full NACE Compliance Verification Available |
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