The American National Standard Institute, ANSI, has been overseeing guidelines and standards for products manufactured through several sectors.
ANSI-approved flanges are used for the industrial market which handles gas, air and steam process systems.
Purpose
Flanges are used to attach a series of pipes or other flanges together. Some flanges, such as in the oil and gas sector, are required to sustain under high amounts of pressure. ASNI provides standards to flange manufactures to test flanges before they can be marketed to a particular sector.
Significance
ANSI provides standards on flanges depending upon pressure in pounds per second per inch (PSI), according to size in inches of the flange. Pressure and size are dependent upon whether the flange is welded to the pipe, threaded or bolted.
Considerations
Depending on the material the flange is made from, such as cast iron or steel, and the type of threaded material used for fittings, every flange is designated to a particular class. From these class ratings, several requirements, such as pressure-temperature rating, bolt and nut dimensions, coating material and several other factors, make up the standards according to the flange characteristics.
Welding Neck Flanges, NW Long Weld Neck Flanges
- ASME/ANSI B16.5 Class 150 WN
- ASME/ANSI B16.5 Class 300 WN
- ASME/ANSI B16.5 Class 600 WN
- ASME/ANSI B16.5 Class 900 WN
- ASME/ANSI B16.5 Class 1500 WN
- ASME/ANSI B16.5 Class 2500 WN
- ASME B16.47 Series A/MSS SP-44 Class 150 WN
- ASME B16.47 Series A/MSS SP-44 Class 300 WN
- ASME B16.47 Series A/MSS SP-44 Class 600 WN
- ASME B16.47 Series A/MSS SP-44 Class 900 WN
Threaded Flanges, TH Flanges
- ASME/ANSI B16.5 Class 150 TH
- ASME/ANSI B16.5 Class 300 TH
- ASME/ANSI B16.5 Class 600 TH
- ASME/ANSI B16.5 Class 900 TH
Slip-on flange
- ASME/ANSI B16.5 Class 150 SO
- ASME/ANSI B16.5 Class 300 SO
- ASME/ANSI B16.5 Class 600 SO
- ASME/ANSI B16.5 Class 900 SO
RTJ Flanges, Ring Type Joint Flange
- Dimensions of Ring Joint Facings
- Ring Joint Facings ASME/ANSI B16.5 & B16.47-1
- Ring Joint Facings ASME/ANSI B16.5 & B16.47-2
- Ring Joint Facings ASME/ANSI B16.5 & B16.47-3
- Ring Joint Facings ASME/ANSI B16.5 & B16.47-4
Lap Joint Flanges
- ASME/ANSI B16.5 Class 150 LJ
- ASME/ANSI B16.5 Class 300 LJ
- ASME/ANSI B16.5 Class 600 LJ
- ASME/ANSI B16.5 Class 900 LJ
- ASME/ANSI B16.5 Class 1500 LJ
- ASME/ANSI B16.5 Class 2500 LJ