Piping Codes and Standards


Piping is governed by International Codes and Standards. Which codes and standards to be referred for a given projects depends on client preferences and local regulations. Here is a list of some of the international codes and standards followed widely world over.

ASME B31 Codes

Sr. Number Description
1 ASME B31.1 Power Piping
2 ASME B31.3 Process Piping
3 ASME B31.4 Pipeline Transporation System for Liquid Hydrocarbons and other liquids
4 ASME B31.5 Refrigeration Piping and Heat Transfer Components
5 ASME B31.8 Gas Transmission and Distribution Piping System
6 ASME B31.9 Building Services Piping
7 ASME B31.11 Slurry Transportation Piping Systems

ANSI/ASME Fittings Standards

Sr. Number Description
1 ASME B1.1 Unified Inch Screw Threads (UN and UNR Thread Form)
2 ASME B1.20.1 Pipe Threads, General Purpose (Inch
3 ASME B1.20.3 Dryseal Pipe Threads (Inch
3 ASME B1.20.4 Dryseal Pipe Threads (Metric Translation)
4 ASME B1.20.7 Hose Coupling Screw Threads (Inch)
5 ASME B16.1 Cast Iron Pipe Flanges and Flanged Fittings
6 ASME B16.3 Malleable Iron Threaded Fittings
7 ASME B16.4 Gray Iron Threaded Fittings.
8 ASME B16.5 Pipe Flanges and Flanged Fittings
9 ASNE B16.9 Factory-Made Wrought Steel Buttwelding Fittings
10 ASME B16.10 Face-to-Face and End-To-End Dimensions of Valves
11 ASME B16.11 Forged Fittings, Socket-Welding and Threaded
12 ASME B16.14 Ferrous Pipe Plugs, Bushings, and Locknuts With Pipe Threads
13 ASME B16.20 Metallic Gaskets for Pipe Flanges — Ring: Joint, Spiral Wound, and Jacketed
14 ASME B16.21 Nonmetallic Flat Gaskets for Pipe Flanges
15 ASME B16.25 Buttwelding Ends
16 ASME B16.28 Wrought Steel Buttwelding Short Radius Elbows and Returns
17 ASME B16.34 Valves-Flanged, Threaded, and Welding End.
18 ASME B16.36 Orifice Flanges, Class 300, 600, 900, 1500, and 2500
19 ASME B16.39 Malleable Iron Threaded Pipe Unions, Class 150, 250, and 300
20 ASME B16.42 Ductile Iron Pipe Flanges and Flanged Fittings, Class 150 and 300
21 ASNE B16.47 Large Diameter Steel Flanges, NPS 26 Through NPS 60
22 ASME B16.48 Steel Line Blanks
23 ASME B36.10M Welded and Seamless Wrought Steel Pipe
24 ASME B36.19M Stainless Steel Pipe


Sr. Number Description
1 MSS-SP-6 Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings
2 MSS-SP-9 Spot Facing for Bronze, Iron and Steel Flanges
3 MSS-SP-25 Standard Marking Systems for Valves, Fittings, Flanges, and Unions
4 MSS-SP-42 Class 150 (PN 20) Corrosion Resistant Gate, Globe, Angle and Check Valves With Flanged and Butt Weld Ends
5 MSS-SP-43 Wrought Stainless Steel Butt-Welding Fittings Including Reference to Other Corrosion Resistant Materials
6 MSS-SP-44 Steel Pipe Line Flanges
7 MSS-SP-45 Bypass and Drain Connections
8 MSS-SP-51 Class 150LW Corrosion Resistant Flanges and Cast Flanged Fittings
9 MSS-SP-58 Pipe Hangers and Supports — Materials, Design, and Manufacture
10 MSS-SP-65 High Pressure Chemical Industry Flanges and Threaded Stubs for Use with Lens Gaskets
11 MSS-SP-69 Pipe Hangers and Suports – Selection and Application
12 MSS-SP-70 Cast Iron Gate Valves, Flanged and Threaded Ends
13 MSS-SP-71 Gray Iron Swing Check Valves, Flanged and Threaded Ends
14 MSS-SP-72 Ball Valves With Flanged or Buttwelding Ends for General Service
15 MSS-SP-75 Specifications for High Test Wrought Buttwelding Fittings
16 MSS-SP-79 Socket-Welding Reducer Inserts
17 MSS-SP-81 Stainless Steel, Bonnetless, Flanged, Knife Gate Valves
18 MSS-SP-83 Class 3000 Steel Pipe Unions, Socket-Welding and Threaded
19 MSS-SP-85 Gray Iron Globe and Angle Valves, Flanged and Threaded Ends
20 MSS-SP-88 Diaphragm Type Valves
21 MSS-SP-95 Swage(d) Nipples and Bull Plugs
22 MSS-SP-97 Integrally Reinforced Forged Branch Outlet Fittings — Socket Welding, Threaded, and Buttwelding Ends

API Standards

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

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