Orifice flange
The orifice flange is an exclusive accessory for pipeline differential pressure flow measurement. It must be used in pairs. An orifice throttling element is clamped between the two flanges. It comes with standard NPT pressure tapping holes and jacking screw structures for disassembly and assembly. By collecting the pressure difference of the medium upstream and downstream of the pipeline, and working with a differential pressure transmitter, it accurately converts the fluid flow rate, enabling real-time metering of the pipeline medium, trade settlement, and process flow monitoring. It is mainly used for precise flow collection in oil and gas transportation, steam pipelines, chemical fluids, gas transportation, and process water systems. The built-in jacking screws allow quick disassembly and assembly of the orifice plate without cutting the pipe, facilitating instrument calibration, overhaul and replacement, and orifice plate cleaning and maintenance. It effectively ensures industrial metering accuracy and eliminates flow data deviations. It is an indispensable core precision pipe fitting in the metering systems of chemical, power, and oil and gas engineering.
Inquiry
- The greatest advantages of orifice flanges are precision pressure measurement, accurate metering, no need to cut pipes for maintenance, and stable sealing performance. Integral precision forging process
- Pressure tapping holes, set screw holes, and bolt holes are all high-precision CNC finish-turned
- High coaxiality of hole positions, no deviation
- Ensuring zero error in differential pressure acquisition. Equipped with set screw disassembly and assembly structure
- Quick orifice plate removal without cutting pipe
Detailed Introduction
The orifice flange is a core pipe fitting for differential pressure flow measurement. It is used in pairs, with an orifice plate clamped in between. It collects the upstream and downstream pressure differential through pressure tapping holes, and works with a differential pressure transmitter to achieve precise measurement of fluid flow. The product complies with ASME B16.36 and HG/T20592 standards, with nominal diameters DN25-DN600, pressure ratings Class300-2500LB or PN10-PN160, and no Class150 low-pressure specification. Compared with ordinary flanges, orifice flanges come with NPT pressure tapping threaded holes and jack screws, allowing quick disassembly and assembly of the orifice plate without cutting off the pipeline, which facilitates inspection and maintenance. The product adopts integral forging and CNC precision turning processes to ensure hole coaxiality and sealing performance, and is suitable for trade measurement and process control in industries such as petroleum, chemical, natural gas, and power. We provide flexible customization services, supporting non-standard sizes, special materials, and sealing surface machining to meet different project requirements.
- Used in pairs, with built-in NPT pressure tapping holes and jack screws, allowing disassembly and assembly of the orifice plate without cutting the pipe, reducing maintenance costs
- Complies with ASME B16.36 and HG/T20592 standards, nominal diameter DN25-DN600, pressure Class300-2500LB or PN10-PN160
- Integral forging, CNC precision turning, high hole coaxiality, ensuring accurate differential pressure collection
- Supports materials such as carbon steel, stainless steel, and duplex steel, suitable for steam, oil and gas, and corrosive media
- Flexible minimum order quantity, MOQ for regular specifications as low as 1 pair, supporting mixed batches and customization
- Provides export-grade protective packaging, supports neutral packaging and OEM branding
| Product Name | Orifice Flange |
| Product Categories | Contact us to confirm |
| Execution Standard | ASME B16.36, HG/T20592, GB/T9119; nominal diameter: DN25-DN600 (NPS1″-24″); pressure rating: Class300-2500LB, PN10-PN160; pressure tapping thread: standard NPT1/2 pressure tapping hole; structural configuration: used in pairs, with built-in jack screws Jack-screw; sealing surface: RF raised face, RJ ring joint face; process: integral forging, heat treatment, CNC precision turning, non-destructive testing, precision calibration; working temperature: carbon steel -20℃~425℃, stainless steel -196℃~600℃; suitable media: steam, oil and gas, natural gas, chemical fluids, corrosive media. All precision dimensions, holes |
| Customization | Our factory possesses full-dimensional precision non-standard customization capabilities for orifice flanges, and can customize special bore ratio configurations, ultra-high-pressure thickened designs, non-standard NPT pressure tap specifications, and special set screw structure flanges. We support customization of eccentric pressure measuring holes, high-precision hole spacing calibration, and special RJ high-pressure ring groove precision machining, suitable for high-end precision metering working conditions. We can perform sandblasting, blackening, hot-dip galvanizing, and acid-alkali resistant anti-corrosion coating treatments. We can reverse-customize exclusive matching orifice flanges according to overseas project drawings, instrument parameters, and old equipment dimensions. We support laser marking, LOGO engraving, batch coding, and precision parameter engraving customization. We can produce duplex steel, low-temperature steel, and nickel-based alloy high-end materials, suitable for customized supporting of overseas high-end chemical, gas, and power precision metering systems. |
| MOQ | Our factory's orifice flanges adopt a flexible foreign trade minimum order mode. The MOQ for conventional commonly used medium and high pressure specifications is as low as 1 pair, which can meet the needs of instrument samples, small-scale engineering modifications, equipment repair and replacement, and metering point supplementary installation. Mainstream carbon steel and stainless steel Class300/600 conventional specifications on the market support scattered purchases, mixed batches of multiple specifications, and combined order shipments, with no mandatory minimum order threshold. Large batch |
| Lead Time | Conventional national standard and American standard general-purpose orifice flanges are kept in stock. Popular pressure and bore specifications are shipped extremely fast within 24 hours, quickly responding to instrument emergency repairs and urgent engineering order needs. Standard batch paired orders have a production lead time of 3-7 working days, with stable production capacity and controllable precision. Ordinary non-standard fine-tuned hole spacing, special set screw configurations, and customized sealing surface orders have a lead time of 7-10 working days. Ultra-high |
| Packaging | Our factory's orifice flanges are precision metering pipe fittings, using high-end precision protective packaging for foreign trade, strictly preventing damage to hole positions, sealing surfaces, and threads. High-precision sealing surfaces are affixed with thickened anti-rust protective film, and NPT pressure tap threads are equipped with special plastic thread protector plugs to prevent thread stripping and entry of impurities. Each piece is individually wrapped and isolated with thickened bubble film to avoid collision deformation and precision damage to the precision structure. Conventional specifications are classified and packed into shockproof thickened export cartons, and large-volume full orders are packed using fumigated solid wood pallets, reinforced with steel straps for shock resistance. The outer packaging clearly marks model, standard, material, pressure, bore, pairing number, batch, and export shipping marks. We support neutral packaging, customer LOGO labeling, and customized shipping marks, fully complying with precision industrial product export commodity inspection, customs clearance, and overseas warehousing standards. |
| Reference Price | Inquiry |
Applications
- Flow rate trade handover in petroleum refining process pipelines requires high-precision metering
- Flow monitoring for long-distance natural gas pipelines and city gas gate stations
- Flow measurement for boiler steam systems in thermal power plants
- Process control for chemical fluids and corrosive media
- Flow automation in water treatment and fine chemicals
Overview
Orifice flanges are precision forged matching flanges specially used for differential pressure flow metering. They must be used in pairs, with an orifice plate clamped in between, collecting upstream and downstream pressure differential through pressure tap holes, and cooperating with differential pressure transmitters to measure fluid flow. The products implement ASME B16.36 and HG/T20592 standards, with bore range DN25-DN600, pressure rating Class300-2500LB or PN10-PN160, and Class150 low-pressure specifications are not provided. Compared with ordinary flanges, orifice flanges come with NPT pressure tap threaded holes and set screws, allowing quick disassembly and assembly of the orifice plate without cutting the pipeline, facilitating inspection and maintenance. The products are widely used in trade metering and process control in petroleum, chemical, natural gas, power, and other industries, and are key pipe fittings for ensuring flow accuracy.
Highlights
The core advantages of orifice flanges lie in precision pressure measurement and pipe-cutting-free maintenance. Integral forging and CNC precision turning processes ensure hole coaxiality and sealing performance, ensuring accurate differential pressure collection. The built-in set screw structure allows quick removal of the orifice plate without cutting the pipeline, greatly reducing maintenance costs and downtime. Paired matching precision is uniform, and flow data accuracy far exceeds ordinary modified flanges. The product has strong rigidity, resists high pressure and vibration, and is suitable for harsh working conditions.
Applications
Orifice flanges are suitable for medium and high pressure pipelines requiring high-precision flow measurement, such as petroleum refining process pipelines, long-distance natural gas transmission pipeline networks, urban gas gate stations, thermal power boiler steam systems, chemical fluid metering, and water treatment flow automatic control. They are mainly used in core equipment areas for trade settlement, process parameter monitoring, and flow closed-loop automatic control, suitable for continuously operating industrial equipment and high-risk medium transportation.
Specifications
Executive standards: ASME B16.36, HG/T20592. Nominal diameter: DN25-DN600 (NPS1"-24"). Pressure rating: Class300-2500LB, PN10-PN160. Pressure tapping thread: NPT 1/2 pressure measuring hole. Structural configuration: used in pairs, with built-in jack-screw. Sealing face: RF raised face, RJ ring joint face. Process: integral forging, heat treatment, CNC precision turning, non-destructive testing. Working temperature: carbon steel -20℃~425℃, stainless steel -196℃~600℃. Applicable media: steam, oil and gas, natural gas, chemical fluids, corrosive media. Specific dimensions and configurations can be customized according to project requirements, please contact us to confirm.
Procurement & Delivery
We offer flexible minimum order quantities, with MOQ for regular specifications as low as 1 pair, supporting small-order samples and bulk procurement. Regular American standard and national standard specifications are kept in stock, with popular specifications shipped within 24 hours; standard order delivery time is 3-7 working days, non-standard customization 7-10 working days. Packaging uses foreign-trade-grade protection to ensure transportation safety. Neutral packaging and customer private labeling are supported. For specific delivery times and packaging requirements, please contact us to confirm.
Service & Support
We provide comprehensive pre-sales and after-sales services, including measurement and model selection guidance, installation solutions, and instrument interfacing technical support. All products undergo dimensional precision calibration, hole position inspection, and non-destructive testing quality inspection before leaving the factory to ensure quality. If there are quality issues after receipt, we support free replacement or return and exchange. We support inventory consignment and partial shipment for long-term supporting customers, and provide lifetime technical consultation.
FAQ
Why must orifice flange be used in pairs?
Orifice flange is a dedicated flange for differential pressure flow measurement and must be used in pairs. An orifice plate is clamped between the two flanges, and the upstream and downstream pressure difference is collected through pressure tapping holes to calculate flow rate. A single unit cannot form a measurement system.
What is the difference between orifice flange and ordinary flange?
Orifice flange has built-in NPT pressure tapping threaded holes and jack-screws, used to connect the differential pressure transmitter and facilitate orifice plate removal, while ordinary flanges do not have these structures. Orifice flange has higher machining precision requirements to ensure measurement accuracy.
What standards and pressure ratings do orifice flanges support?
We provide ASME B16.36 and HG/T20592 standards, with pressure ratings covering Class300-2500LB and PN10-PN160, and do not provide Class150 low-pressure specifications. Specific customization is available according to project requirements.
What is the minimum order quantity for orifice flanges?
The minimum order quantity for standard specifications is as low as 1 pair, supporting small-batch samples and engineering repair replacements. Bulk purchases can enjoy more favorable prices and delivery times.
Can orifice flanges be customized?
Yes. We support customization of non-standard sizes, special materials (such as duplex steel, nickel-based alloys), special sealing faces (such as RJ ring joint faces), as well as non-standard pressure tap holes and set screw structures. Please provide detailed drawings or parameters, and we will assist in confirmation.
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