American Flange Application Standard System (ANSI FLANGE)
The American National Standard ANSI B16.5 “Steel Pipe Flanges and Flange Fittings” is a relatively complete, mature, and internationally popular and universal advanced standard. The pressure piping application standard system composed of this standard and other related ANSI, API, ASTM, and MSS is formed on the basis of a large number of experimental studies and has undergone decades of practical testing. Therefore, it is a scientific and advanced standard. Widely accepted by various countries.
Tube: Large outer diameter series (ANSI B36.10 and ANSI B36.19)
Nominal diameter range: (DN6~DN2000) mm
Wall thickness representation method:
1) The wall thickness is expressed by the pipe table number “Sch”; 2) The wall thickness is expressed by the weight of the pipe. Pipe flange: American flange
Pressure rating: CL150 300 400 600 900 1500 2500 Psi 7 grades,
Nominal pressure: 150Lb (2.0Mpa), 30OLb (5.0Mpa), 400Lb (6.8Mpa), 600Lb (10.0Mpa), 900Lb (15.OMpa), 1500Lb (25.0Mpa), 2500Lb (42.0Mpa).
Note: 150LB means 300 pounds, CL means pressure class class, CL150 (PN2.0), CL300 (PN5.0),
CL600 (PN11), CL900 (PN15), CL1500 (PN26), CL2500 (PN42)
Nominal diameter: DN15~600mm
Flange sealing surface: raised table surface (RF), concave and convex surface (MF>, tongue and groove surface (TG), metal ring connection surface 4 types of flange types: flat welding, socket welding, butt welding, threaded connection , Loose sleeve and flange cover 6 kinds
The abbreviations of WN, SO, BL, TH, LJ, SW in the American standard flange mainly indicate the welding structure of the flange neck and the simplified or connecting pipe:;
wN (welding neck) is [slip on flange] so (slip on) is [slip on flange]
BL (blind) is [flange cover], also called “blind plate” TH (thread) is [threaded neck flange]
LJ (lap joint) is [loose flange] This type no longer exists in the new standard in 2009 and has been repaired.
Change to【LFISE Butt Welding Ring Loose Flange】
sw (socket welding) is [socket welding flange]
Example 1: ANSI B16.5 150Ibs 3″M flange
ANSIB16.5 is the American flange system; 150LB is the pressure rating of 150 pounds; 3″ means that the size of the flange is 3 inches; the code name of the raised face flange is M, and the raised face flange needs to be matched with the concave face flange, commonly known as “one Male and female”, M face flange needs to be connected with FM face (concave and convex face MF).
Example 2: CL150, WN/RF, STD, A105, ASME B16.5 flange
ASME B16.5 is the implementation standard for flanges, which belongs to the American system and is popularly called the American Standard. The domestic standard is called the national standard, and the industry standards include the standards of the Ministry of Chemical Industry and the Ministry of Machinery. STD, A105 is the material of the flange, which belongs to carbon steel. WN, is the code name for butt-welded flange with strength, which means high neck, and PL flat welding, SO flat welding with strength, RF is the sealing surface type! It is the raised face! CL150 is the pressure of the flange, which is about 2MPA.
ASME is the American Society of Mechanical Engineers ANSI is the American National Standards Institute
They all have their own standards and standard numbers. The pressure rating is in the ANSI standard, but the ASME standard now directly refers to this standard. This phenomenon is very common in American standards. For example, ASME SA105 is equivalent to ASTMA105, ASME B16.5 Equivalent to ANSI B16.5 and so on.
◆The commonly used standards in the American application standard system ANSI are:
ANSIASME B36.10 seamless and welded steel pipe
ANSIASME B36.19 stainless steel seamless and welded steel pipe ANSIASME B16.9 factory-manufactured steel butt welding pipe fittings ANSIASME B16.11 socket welding and threaded forged pipe fittings
ANSIASME B16.28 steel butt welding small radius elbow and back elbow
ASMEIANSI B16.34 flanged, threaded and welded valves ASME/ANSI B16.5 pipe flanges and flanged pipe fittings
ASMEIANSIB16.36 orifice flange
ASMEIANSI B16.42 ductile iron flanges and flange pipe fittings
ASME/ANSI B16.47 large diameter steel flange
ASMEIANSIB16.20 Spiral Wound, Covered Gasket and Ring Groove Metal Gasket for Pipe Flange ASMEIANSIB16.21 Non-metallic Flat Gasket for Pipe Flange
ASMEIANSI B18.2.1 square head and hexagon head bolts and threads ASMEIANSI B18.2.2 square head and hexagon head nuts
APl std605 large diameter flange, flange cover
Inspection and test of APl std526 flanged steel pressure relief valve APl std598 valve
APl std599 flange connection and welding connection metal plug valve. Fruit APl std600 flange and butt welding connection steel gate valve
APl std602 small steel gate valve (compact gate valve) APl std603 150 lbs. corrosion-resistant flange valve
APl std608 flanged and butt welded metal ball valve APl std609 lug type and wafer type butterfly valve
API std6D pipeline valve specification
MSS SP-44 with neck flat welding flange