Steel Flanges
What are Steel Flanges?
A flange is a forged or cast ring of steel designed to connect mechanically sections of pipe or join pipe to a pressure vessel, pump, valve or any other piece of equipment.
Flange is a ring of steel (forged, cut from plate, or rolled) designed to connect sections of pipe, or to join pipe to a pressure vessel, valve, pump or other integral Flanged assembly. Steel flanges provide an easy access for cleaning, inspection or modification. They usually come in round shapes but they can also come in square and rectangular forms. The flanges are joined to each other by bolting and joined to the piping system by welding or threading and are designed to the specific pressure ratings; 150lb, 300lb, 400lb, 600lb, 900lb, 1500lb and 2500lb.
A flange can be a plate for covering or closing the end of a pipe. This is called a blind flange. Thus, flanges are considered to be internal components which are used to support mechanical parts.
Types of Flanges
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The standard type of steel flanges mostly used are:
• Welding Neck Flange
• Slip On Flange
• Socket Weld Flange
• Lap Joint Flange
• Threaded Flange
• Blind Flange
In addition to the most used standard flanges, there are still a number of special steel flanges such as:
• Orifice Flanges
• Long Welding Neck Flanges
• Weldoflange
• Nipoflange
• Expander Flange
• Reducing Flange
Materials Used for Flanges
Materials for Flanges used mostly are Carbon steel, Stainless steel, Alloy Steel, Inconel, Nickel, Titanium and other. Metallica supply different forged steel flange material standards in ASTM A105, ASTM A182, ASTM A350, ASTM A694, ASTM A516, Manufacturing standards in ASME B16.5, ASME B16.47, ASME B16.36 and etc.
Pipe Flanges Rating in Different Norms
The flanges ratings are very important for flanges application, correct flanges rating will keep the application safe. Every country has their owned norms for pipe flanges, but in fact, the flanges norms can be separated to American norms and European Norms. The American norms have ANSI, API, AWWA, MSS etc norms for flanges, their rating use “LBS”, for example 75lbs, 150lbs, 300lbs, 600lbs, 900lbs, 1500lbs, 2500lbs etc, but for European norms, like DIN, EN1092-1, BS4504, UNI etc, the rating USE “PN”, for example PN6, PN10, PN16, PN25, PN40, PN63, PN64, PN100 etc. Also, for the Russian flanges of GOST 12820 and GOST 12821, they are similar to European norms, but use PNxx mPa, for example, PN0.6MPA, PN1.0MPA, PN1.6MPA, PN2.5MPA, PN4.0MPA. Even in Africa, the main flanges standard is SANS1123 or SABS1123, it is South African norm, its rating is for 600kpa, 1000kpa, 1600kpa, 2500kpa, 4000kpa etc, also similar to European Norms. In China, before time, Chinese flanges are similar to CCCP, but in recent years, Chinese flanges norms revised to European system and they also use PN6-PN100 rating.
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Established in 1975, Metallica Metals are the major manufacturer that specializes in producing and exporting high quality forged flanges to more than 50 countries and areas. Depending on the superiority of production and sales, Metallica offers high quality forged steel flanges in wide applications for water works, shipbuilding industry, petrochemical & gas industry, power industry, valve industry and general pipes connecting projects etc. Metallica also provides all the norms of flanges worldwide at competitive prices.