| 1 | ANSI B16.11 | Pipe Flanges and Flanged Fittings. |
| 2 | ANSI B 16.5 | Flanges |
| 3 | MSS SP-44 | Large Dia Flanges. |
| 4 | ASME B 16.47 (SERIES A & B) | Large Dia Flanges |
| 5 | DIN | Flanges. |
| 6 | BS 4504 | Flanges |
| 7 | ASTM A105 | Forging, Carbon Steel for piping components |
| 8 | ASTM A182 | Forged & Rolled Alloy Steel Pipe Flanges. Forged Fittings & Valves and parts for high temperature services. |
| 9 | ASTM A 350 | Carbon & Low Alloy Steel, requiring notch toughness testing for piping components |
| 10 | ASTM A 515 | Standard specifications for Pressure Vessel-Plates Carbon Steel for intermediate and higher temperature services. |
| 11 | ASTM A 516 | Standard Specifications for Pressure Vessel Plates Carbon steel for Moderate and lower temperature services. |
| 12 | ASTM A 517 | Standard specifications for Pressure Vessel Plates Alloy Steel High Strength Quenched & Tempered. |
| 13 | ASTM A 333 | Standard specification for Seamless & Welded Steel Pipe for Low Temperature Services. |
| 14 | ASTM A 335 | Standard Specification for Seamless Ferritic Alloy steels pipe for High Temperature Services. |
| 15 | IS 2002 | Specification for steels Plates for Boilers. |
| 16 | IS 2062 | Specification for weldable structure steel. |
| 17 | IS 1239 | Mild Steel Tubes Tubular & other wrought steel fittings specification. |
| 18 | IS 3589 | Mild Steel Tubes Tubular & other wrought steel fittings specification. |
