The existence of an MSS Standard Practice does not in itself preclude the manufacture, sale, or use of products not conforming to the Standard Practice. Mandatory conformance to this Standard Practice is established only by reference in other documents such as a code, specification, sales contract, or public law, as applicable. MSS has no power, nor does it undertake, to enforce or certify compliance with this document. Any certification or other statement of compliance with the requirements of this Standard Practice shall not be attributable to MSS and is solely the responsibility of the certifier or maker of the statement.
This Standard Practice shall remain silent on the validity of those other standards of prior or subsequent dates of issue even though applicable provisions may not have changed. MSS shall not be held responsible for identifying any patent rights.
Users are expressly advised that determination of patent rights and the risk of infringement of such rights are entirely their responsibility. Note that supplemental information does not include mandatory requirements. The specific detail of the change may be determined by comparing the material flagged with that in the previous edition. Non-toleranced dimensions in this Standard Practice are nominal unless otherwise specified. Excerpts of this Standard Practice may be quoted with permission.
All rights reserved. Printed in U. It was developed for the purpose of providing a uniform means of testing valves commonly used in the "full open" and "full closed" type of service.
Two material designation subsections that involve standard reference for marking nameplates and bodies have been revised. Terminology has been updated. For specific non-ferrous flanges, flanged fittings, and flanged unions, extra material designations have been included.
Annex B was updated to include modified and new examples. References in Annex C were updated. You may also like these posts:. ASME A Leave a Reply Cancel reply Your email address will not be published. At the manufacturer's option, the numerals designating the cold working pressure supplemented by the letters "CWP" may be added. Austenitic stainless steel socket-welding end fittings and unions may carry the grade identification symbols in lieu of the ASTM number. Austenitic stainless steel threaded fittings may carry only the grade identification symbols.
MSS SP high-test, wrought, butt-welding fittings have grade identification consisting of the letters "HY" and the numerals comprising the minimum specified yield strength in thousands of pounds per square inch ksi. Forged steel and barstock fittings shall be marked with numerals indicating the pressure class designation tabulated in ASME B When the nominal rating is other than that specified in ASME or MSS standards, the numerals compnsmg the maximum pressure in psi, supplemented by one or more of the standard symbols identifying the class of service, shall be used.
Butt-welding end products that carry the same ratings as the pipe with which they are intended to be used, shall be marked with the appropriate.
At the manufacturer's option, the ambient temperature rating may be added to the body in all valve sizes, followed by the letters "CWP" or other designation permitted by Section 4. Gray iron valves rated for ambient temperature service only shall be marked on the body with numerals indicating the rated pressure followed by the letters "CWP" or other designation permitted by Section 4.
Cast copper alloy or wrought copper solder-joint drainage products shall be marked "DWV" to signifY drainage waste vent. Malleable iron body castings will be marked with "MI". Cast markings obliterated during manufacturing may be replaced by stamped or engraved plates.
Stamping or engraving at the manufacturer's option. No marking by welding shall be permitted on ductile iron valves. Where stamping is used on the pressure retaining patts of the valve, see Section 2. Markings shall be as follows see Annex B Cast markings obliterated during manufacturing may be replaced by engraving or stamping, at the manufacturer's option.
Marking by welding is prohibited on gray iron valves. At the manufacturer's option, the ASTM number of grade may be added. The examples are therefore grouped to show typical, acceptable markings for valves produced in accordance with:. Markings shall be as follows:. They are not intended to imply that they are the only acceptable markings under this Standard Practice, nor are they intended as an endorsement or approval of acceptable limits for the example materials.
The examples illustrate the marking sequence of Sections The actual sequence and positioning of the actual markings, on an actual product, is at the option of the manufacturer. Identification I. Plate and Body Marking examples are located within Annex B Plate and Body Marking examples are located within Annex Bl8.
NOTES: 1 The permanently attached marked plate on the body is for the purpose of showing body markings and should not be confused with the Identification Plate in Section DN 6 8 10 15 20 25 32 40 50 65 80 DN Marking Requirement Examples This Annex is an integral part of this Standard Practice and is placed after the main text for convenience. NOTE: The examples in this Annex B correspond to the section where the requirement is located and are not listed in numerical order e.
Marldng Requirement Mfr's name or trademark Rating designation. Marldng Requirement Mfr's name or trademark Rating and material designation. Marldng Requirement. Mfr's name or trademark. Mfr's name or trademark Material designation Melt identification see Section 6 Rating designation. Marking Requirement Examples B Marking Requirement. Marking Requirement Examples Bl3. Marldng Requirement Mfr's name or trademark Rating designation Class only.
Marhlng Requirement Mfr's name or trademark Rating designation Size. Marhlng Requirement Mfr's name or trademark Rating designation Material designation. Marldng Requirement Mfr's name or trademark Material designation Rating designation.
Welding Fittings and Union Nuts B Mfr' s name or trademark Rating designation Material designation Size Melt identification. Mfr's name or trademark Material designation Rating designation Size Melt identification. Mfr's name or trademark Rating designation for drainage waste vent Rating designation when fitting is designed for dty vents.
Plate and Body Marking Examples. Mfr's name or trademark Material designation Rating designation Service limitation Melt identification Trim identification stem-disc-seats Size Conformance marking.
Mfr's name or trademark Material designation Rating designation Service limitation Melt identification Trim identification stem-disc-seat Size Conformance marking. Mfr's name or trademark Material. Mfr's name or trademark Material designation Rating designation Service limitation Melt identification Trim identification plug Size Conformance marking. Plate Marldng. Plate Marking Mfr's name or trademark Material designation Rating designation Service limitation Melt identification Trim identification stem-discseat Size Conformance marking.
Mfr's name or trademark Material designation Rating designation Service limitation Melt identification Trim identification Size Conformance marking. Mfr's name or trademark Material designation Rating designation Service limitation Melt identification Trim identification stem-disc-seats Size Additional marking Conformance marking. NOTE: a I. Marking Requirement Examples Bl8. Mfr's name or trademark Material designation Rating designation Service limitation Melt identification Trim identification disc-seat Size Conformance marking.
Mfr's name or trademark Material designation Special rating designation Melt identification Trim identification disc-seat Size Confom1ance marking. Mfr' s name or trademark Material designation Rating designation Service limitation Melt identification Trim identification stem-disc-seat Size Confom1ance marking. Mfr's name or trademark Material designation Rating designation Service limitation Melt identification Trim identification stem-discseat Size Confom1ance marking Additional markings.
Plate Marldnl! Mfr's name or trademark Material designation Rating designation Service limitation Melt identification Trim identification disc-seat Size. Mfr's name or trademark Material designation Rating designation Service limitation Melt identification Trim identification stem-disc-seat Size Additional markings. Mfr's name or trademark Material designation Rating designation Service limitation Melt identification Trim identification stem-disc-seats Size Additional markings.
Mfr's name or trademark Material designation Rating designation Service limitation Melt identification Trim identification stem-disc-seats Size. Mfr' s name or trademark Material designation Rating designation Melt identification Trim identification Size. Consult applicable Code for marking requirements. Specification for Wellhead and Christmas Tree Equipment; incl.
Errata 1 Referenced Standards and Applicable Dates This Annex is an integral part of this Standard Practice and is placed after the main text for convenience. The following organizations appear on the previous pages of this annex or are referenced in this Standard Practice: AISI.
American National Standards Institute, Inc. Box Johnston, RI Underwriter's Laboratories, Inc.
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