Codes and Standards

A code is a standard that has been adopted by one or more governmental bodies and has the force of law.

Standards are considered voluntary because they serve as guidelines, but do not of themselves have the force of law. ASME cannot force any manufacturer, inspector, or fabricator to follow ASME standards.  Their use is voluntary. Standards become mandatory when they have been incorporated into a contractual document (client specification requirement) or incorporated into regulations.

A standard can be defined as a set of technical definitions and guidelines, how to give instructions for designers, fabricators and operators. Standards promote safety, reliability, productivity and efficiency in almost every industry that relies on engineering components or equipment.  Standards can run from a few paragraphs to hundreds of pages, and are written by experts with knowledge and expertise in a particular field who sit on many committees.

Standards are a vehicle of communication for producers and users. They serve as a common language, defining quality and establishing safety criteria. By following the same standard, interchangeability is assured. 
These code helps to maintain integrity with safety, environment and HSE. 

American National Standard Institute (ANSI) 
American Society of Mechanical Engineers (ASME)

ASME B 31.1               Power piping
ASME B 31.2                 Fuel Gas piping
ASME B 31.3            Process Piping for Petroleum refineries, Chemical, Pharmaceutical, Textile,  Paper, Semiconductor & Cryogenic plant
ASME B 31.4             Piping generally used for transporting & distributing liquid Hydrocarbons & other liquids
ASME B 31.5                 Refrigeration piping
ASME B 31.7                 Nuclear Power piping
ASME B 31.8                 Piping generally used for transporting & distributing Gases.
ASME B 31.9                 Building services
ASME B 31.11               Slurry transportation piping system
ASME B 16.5                 Pipe Flanges and Flanged Fittings NPS 1/2 Trough NPS 24
ASME B 16.9                 Factory-Made Wrought Steel Butt welding Fittings
ASME B 16.10               Face-to-Face and End-to-End Dimensions of Valves
ASME B 16.11               Forged Fittings, Socket- Welding and Threaded
ANSI B 16.14                Ferrous Pipe Plugs, Bushing and Locknuts with Pipe Threads
ASME B 16.20               Metallic Gaskets for Pipe Flanges- Ring-Joint, Spiral-Wound, and Jacketed
ASME B 16.21               Nonmetallic Flat Gaskets for Pipe Flanges
ASME B 16.25               Butt welding Ends
ASME B 16.28               Wrought Steel Butt welding Short Radius Elbows
ASME B 16.34               Valves - Flanged, Threaded, and Welding End
ASME B 16.36               Orifice Flanges
ASME B 16.47a             Large Diameter Steel Flanges NPS 26 Through NPS 60
ASME B 16.48               Line Blinds
ANSI B 18.2.1               Square and Hex nuts (Inch Series)
ASME B 36.10M             Welded and Seamless Wrought Steel Pipe
ASME B 36.19M             Stainless Steel Pipe
American Petroleum Institute (API)
API SPEC 5L                 Specification for Line Pipe
API STD 594                 Check Valves: Wafer, Wafer-Lug, and Double Flanged Type
API STD 598                 Valve Inspection and Testing
API STD 600                 Steel Gate Valves- Flanged and Butt-welding Ends,
Bolted and Pressure Seal Bonnets
API STD 602               Compact Steel Gate Valves- Flanged, Threaded, Welding, and Extended- Body Ends
API STD 607                 Fire Safe Valves.
API STD 609                 Butterfly Valves: Double Flanged, Lug-and wafer Type
API STD 610                 Centrifugal Pumps for Petroleum, Petrochemical and Natural Industries.
Manufacturers standardizations society-standard practice
MSS SP-6                Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End  Flanges of Valves and Fittings
MSS SP-25                    Standard Marking Systems for Valves, Fittings, Flanges & Union
MSS SP-45                    Bypass and Drain Connections
MSS SP-61                    Pressure Testing of Steel Valves
MSS SP-67                    Butterfly Valves
MSS SP-75                    Specification for High Test Wrought Butt Welding Fittings
MSS SP-82                    Valve Pressure Testing Methods
MSS SP-95                    Swadged Nipples and Bull Plugs
MSS SP-97                   Integrally Reinforced Forged Branch Outlet Fittings-Socket welding, Threaded and Butt welding Ends.
American Society for Testing and Materials (ASTM)
ASTM Section II A Volume 1 & 2
ASTM Section V
ASTM Section VIII Division 1 & 2

British Standards (BS)
BS 5351                        Steel ball valves for petroleum, petrochemical & allied industries
BS 5352                       Specifications for steel wedge gate, globe & check valves 50 mm & smaller   for petroleum, petrochemical & allied industries
BS 5353                       Steel plug valves
BS 1873                   Steel globe & globe stop & check valves (Flanged & butt-welded ends) for petroleum, petrochemical & allied industries

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