MSS SP-25 Marking System for Valves, Fittings, Flanges and Unions

1.1 This MSS SP-25 Marking system applies to valves, fittings, flanges and unions used in piping connections which include (but nare not limited to) flanged, soldered, brazed, threaded or welded joints.

1.2 These specified markings serve to identify the manufacturer, the rating designation,materials of construction and special service limitations imposed by the manufacturer.The are used for product identification and to assist in proper application.

Click here for PDF of MSS-SP-25-STANDARD MARKING SYSTEM FOR VALVES FITTINGS FLANGES AND UNIONS. >>>

Research use only, Commercial use is prohibited. 

If you want to use it ,you can buy from following link:
http://msshq.org/Store/Details.cfm?ProdID=1169&Category=6