Introduction to the American applied standards system ANSI

The American national standard ANSI B16.5 "Steel Pipe Flanges and Flange Fittings" is a relatively complete and mature standard that is also internationally popular and universal. This standard and other related pressure pipeline application standard systems composed of ANSI, API, ASTM, and MSS are formed on the basis of a large number of experimental studies and have experienced decades of practical testing. Therefore, it can be regarded as a scientific and advanced standard, and Widely accepted by various countries.
◆Pipe: Large outer diameter series (ANSI B36.10 and B36.19)
       Nominal diameter range: (DN6~DN2000)mm
       Wall thickness expression method:
       1) The pipe number "Sch" indicates the wall thickness;
       2) The thickness of the pipe wall is expressed by the weight of the pipe.
◆Pipe flange: American flange
       Pressure level: CL150 300 400 600 900 1500 2500 Psi 7 levels
       Nominal diameter: DN15~600mm
       Flange sealing surface: 4 types: convex surface (RF), concave and convex surface (MR), tongue and groove surface (TAG), metal ring connection surface
       Flange types: 6 types: flat welding, socket welding, butt welding, threaded connection, loose sleeve and flange cover

◆Commonly used standards in the American applied standards system ANSI include:
       ANSI/ASME B36.10 Seamless and Welded Steel Pipe
       ANSI/ASME B36.19 stainless steel seamless and welded steel pipe
       ANSI/ASME B16.9 Factory Made Steel Butt Weld Fittings
       ANSI/ASME B16.11 Socket Weld and Threaded Forged Fittings
       ANSI/ASME B16.28 Steel Butt Weld Small Radius Elbows and Return Elbows
       ASME/ANSI B16.34 flanged, threaded and welded valves
       ASME/ANSI B16.5 pipe flanges and flange fittings
       ASME/ANSI B16.36 orifice plate flange
       ASME/ANSI B16.42 Ductile Iron Flanges and Flange Fittings
       ASME/ANSI B16.47 Large Diameter Steel Flange
       ASME/ANSI B16.20 Wrap-type, wrapped gaskets and ring-grooved metal gaskets for pipe flanges
       ASME/ANSI B16.21 Non-metallic flat gaskets for pipe flanges
       ASME/ANSI B18.2.1 Square and Hex Head Bolts and Threads
       ASME/ANSI B18.2.2 Square and Hex Head Nuts
       API std605 large diameter flange, flange cover
       API std526 flanged steel pressure relief valve
       Inspection and testing of API std598 valves
       API std599 flanged and welded metal plug valves
       API std600 flanged and butt welded steel gate valves
       API std602 small steel gate valve (compact gate valve)
       API std603 150 pound corrosion resistant flange valve
       API std608 metal ball valve with flange connection and butt welding connection
       API std609 lug type and wafer type butterfly valve
       API std6D pipeline valve specification
       MSS SP-44 flat welding flange with neck