MSS SP 25:2008
MSS SP 25:2008 Standard Marking System For Valves, Fittings, Flanges, And Unions Applicable to valves, fittings, flanges, and unions used in piping connections which include flanged, soldered, brazed, threaded, or welded joints.
Table of Contents
GENERALRULES1SCOPE
2GENERALMARKINGREQUIREMENTS
3MANUFACTURER'SNAMEORTRADEMARK
4RATINGDESIGNATION
5MATERIALDESIGNATION
6MELTIDENTIFICATION
7VALVETRIMIDENTIFICATION
8SIZEDESIGNATION
9IDENTIFICATIONOFTHREADEDENDS
10RING-JOINTFACINGIDENTIFICATION
11PERMISSIBLEOMISSIONOFMARKINGS
SPECIFICRULES
12MARKINGREQUIREMENTSFORFLANGES,FLANGEDFITTINGS,AND
FLANGEDUNIONS
13MARKINGREQUIREMENTSFORTHREADEDFITTINGSANDUNIONNUTS
14MARKINGREQUIREMENTSFORWELDINGANDSOLDERJOINTFITTINGS
ANDUNIONS
15MARKINGREQUIREMENTSFORNON-FERROUSVALVES
16MARKINGREQUIREMENTSFORGRAYIRONVALVES
17MARKINGREQUIREMENTSFORDUCTILEIRONVALVES
18MARKINGREQUIREMENTSFORSTEELVALVES
ANNEXAReferencedStandardsandApplicableDates