| Sr. | Number | Title |
| 1 | API 526 | Flanged Steel Pressure-Relief Valves |
| 2 | API 560 | Fired Heaters for General Refinery Services |
| 3 | API 594 | Wafer and Wafer-Lug Check Valves |
| 4 | API 599 | Metal Plug Valves |
| 5 | API 600 | Bolted Bonnet Steel Gate Valves for Petroleum and Natural Gas Industries |
| 6 | API 602 | Compact Steel Gate Valves |
| 7 | API 603 | Class 150, Cast, Corrosion-Resistant, Flanged-End Gate Valves |
| 8 | API 605 | Large Diameter Carbon-Steel Flanges (NPS 26-60, class 75, 150, 300, 400, 600 and 900 |
| 9 | API 608 | Metal Ball Valves |
| 10 | API 609 | Butterfly Valves: Double Flanged, Lug- and Wafer-Type |
| 11 | API 610 | Centrifugal Pumps for Petroleum, Petrochemical and Natural Gas Industries |
| 12 | API 611 | General Purpose Steam Turbines for Petroleum, Chemical, Gas Industry Services |
| 13 | API 612 | Special Purpose Steam Turbines For Petroleum, Chemical, Gas Industry Services |
| 14 | API 616 | Gas Turbines For |
| 15 | API 617 | Axial and Centrifugal Compressors and Expander-compressors for Petroleum, Chemical and Gas Industry Services |
| 16 | API 618 | Reciprocating Compressors |
| 17 | API 619 | Screw Compressors |
| 18 | API 620 | Design and Construction of Large, Welded, Low Pressure Storage Tanks |
| 19 | API 621 | Reconditioning metallic gate, globe, and check valves. |
| 20 | API 650 | Welded Steel Tanks for Oil Storage |
| 21 | API 660 | Shell-and-tube Heat Exchangers |
| 22 | API 661 | Air-Cooled Heat Exchangers for General Refinery Service |
| 23 | API 662 | Plate Heat Exchangers for General Refinery Services |
