Flange with Orifice Welding Neck

A flange with orifice welding neck, also known as weld neck orifice flange, is a crucial piping component. It is mainly used for measuring the volumetric flow rate of liquids and gases in pipelines. It consists of a flange body with a welding neck that is butt-welded to the pipeline. The flange has radial tapped holes for pressure measurement and usually one or two jack screws to separate the flanges for orifice plate inspection or replacement. Available in materials like carbon steel and stainless steel, it comes in pressure classes 300#, 600#, 900#, 1500#, and 2500#.

High Strength and Pressure Resistance: Thanks to their welded neck design and tapered hub, they can evenly distribute stress and transfer the pressure from the inside to the pipe, enabling them to withstand high-pressure and high-temperature conditions, thus being suitable for high-stress applications.
 

Good Leak Resistance: The precision welding of flange with orifice welding neck ensures a tight seal, effectively minimizing the risk of leakage and enhancing operational safety.
 

Reduced Stress Concentration: The smooth transition from the flange to the pipe reduces stress concentration, which helps prevent cracks and failures.
 

Accurate Alignment: It is beneficial for the precise alignment of pipes, resulting in better fluid flow and reduced turbulence.
Excellent Flow Characteristics: The internal diameter of the flange matches that of the pipe, and the smooth bore reduces pressure drop and turbulence, facilitating the high-pressure and smooth flow of liquids.

According to Pressure Ratings: There are low-pressure, medium-pressure, and high-pressure types. For example, in ASME standards, different pressure levels such as Class 150, Class 300, and Class 600 are specified to meet the requirements of different working conditions.
 

According to Seal Face Forms: It includes raised face (RF), male and female face (MFM), tongue and groove face (TG), and ring joint face (RJ). The RF type is commonly used in general conditions, while MFM and TG are often used in occasions where higher sealing requirements are needed.
 

According to Manufacturing Processes: There are forging, casting, cutting, and rolling types. Forged flanges have good mechanical properties, while cast flanges are suitable for complex shapes and have lower costs.

Petrochemical Industry: It is widely used in oil and gas transportation pipelines, chemical reaction equipment connections, and other aspects. For example, in oil refineries, flange with orifice welding neck is used to connect various pipes and equipment to ensure the safe and stable transportation of oil and gas and chemical media under high pressure and high temperature.
 

Power Industry: It is used in power plant piping systems, such as steam pipelines and water supply and drainage pipelines. The high-temperature and high-pressure steam pipelines in thermal power plants require the use of flange with orifice welding neck to ensure reliable connections and prevent leakage.
 

Chemical Fertilizer Industry: In the production process of chemical fertilizers, flange with orifice welding neck is used in the transportation of various corrosive media and high-pressure gas pipelines to ensure the normal operation of the production process.
 

Shipbuilding Industry: It is used in shipboard piping systems, such as fuel pipelines, cooling water pipelines, and compressed air pipelines to ensure the reliability and tightness of the ship's piping connections.

Carbon Steel: It has good mechanical properties and is cost-effective, suitable for general pressure and temperature conditions. Common carbon steel materials include WCB and A105.
 

Stainless Steel: It has excellent corrosion resistance and high-temperature resistance, suitable for occasions where the medium is corrosive or the temperature is high. Such as 304, 316, and 316L stainless steel are often used in the chemical and food industries.
 

Alloy Steel: It has high strength and good heat resistance and is used in some high-pressure, high-temperature, and high-stress working conditions. For example, chromium-molybdenum steel and chromium-molybdenum-vanadium steel are used in power plants and petrochemical equipment.
 

Non-ferrous Metals: Such as copper and aluminum alloys. Copper alloy flanges have good thermal conductivity and corrosion resistance and are used in some special occasions such as heat exchange equipment. Aluminum alloy flanges are lightweight and suitable for some occasions where weight reduction is required.

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