1、MSS SP-112-2016 Quality Standard for Evaluation of Cast Surface Finishes Visual and Tactile Method Standard Practice Developed and Approved by the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE Vienna, Virginia 22180-4602 Phone: (703) 281-6613 Fax:
2、 (703) 281-6671 E-mail: standardsmsshq.org www.msshq.org MSS STANDARD PRACTICE SP-112i This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 304 and the MSS Coordinating Committee. The content of this Standard Practice is the resulting efforts of competent and e
3、xperienced volunteers to provide an effective, clear, and non-exclusive standard that will benefit the industry as a whole. This MSS Standard Practice describes minimal requirements and is intended as a basis for common practice by the manufacturer, the user, and the general public. The existence of
4、 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, a
5、s 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 o
6、f the statement. “Unless indicated otherwise within this MSS Standard Practice, other standards documents referenced to herein are identified by the date of issue that was applicable to this Standard Practice at the date of approval of this MSS Standard Practice (see Annex A). This Standard Practice
7、 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.” By publication of this Standard Practice, no position is taken with respect to the validity of any potential claim(s) or of any patent rights i
8、n connection therewith. 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. In this Standard Practice, all text, notes, annexes, tables, fig
9、ures, and references are construed to be essential to the understanding of the message of the standard, and are considered normative unless indicated as “supplemental”. All appendices, if included, that appear in this document are construed as “supplemental”. Note that supplemental information does
10、not include mandatory requirements. Substantive changes in this 2016 edition are “flagged” by parallel bars as shown on the margins of this paragraph. The specific detail of the change(s) may be determined by comparing the material flagged with that in the previous edition. Non-toleranced dimensions
11、 in this Standard Practice are nominal unless otherwise specified. Excerpts of this Standard Practice may be quoted with permission. Credit lines should read Extracted from MSS SP-112-2016 with permission of the publisher, Manufacturers Standardization Society of the Valve and Fittings Industry. Rep
12、roduction and/or electronic transmission or dissemination is prohibited under copyright convention unless written permission is granted by the Manufacturers Standardization Society of the Valve and Fittings Industry Inc. All rights reserved. Originally Approved: January 1993 Originally Published: Ma
13、rch 1993 Current Edition Approved: October 2016 Current Edition Published: November 2016 MSS is a registered trademark of Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright , 2016 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc.
14、Printed in U.S.A. MSS STANDARD PRACTICE SP-112ii FOREWORD One of the MSS Cast Surface Comparators, as described in Section 4 and Figure 1, is included with the purchase of the printed version of this Standard Practice because it is a necessary and normative part of the Standard Practice. However, th
15、e Comparator is a “necessary and normative” part of the Standard Practice whether purchased in printed form or electronically. Those purchasing this Standard Practice, in electronic format, may submit a receipt to MSS within 30 days of payment and receive a Comparator at no charge. Additional MSS Ca
16、st Surface Comparators may be purchased through our web site or by contacting the home office. MSS STANDARD PRACTICE SP-112iii TABLE OF CONTENTS SECTION PAGE PURPOSE 1 1 SCOPE . 1 2 DEFINITIONS . 1 3 CAST SURFACE FINISH . 1 4 MSS CAST SURFACE COMPARATOR . 2 5 PROCEDURE 2 6 ACCEPTANCE OR REJECTION .
17、2 FIGURE 1 MSS Cast Surface Comparator (Illustrative only) . 3 ANNEX A Referenced Standards and Applicable Dates 4 MSS STANDARD PRACTICE SP-1121 QUALITY STANDARD FOR EVALUATION OF CAST SURFACE FINISHES VISUAL AND TACTILE METHOD PURPOSE a) To establish an easy “sight and feel“ method for the quality
18、evaluation of cast surface finishes. b) To make available a Cast Surface Comparator with MSS surface rating numbers 1 through 10, to be used to monitor surface finish by a visual and tactile method. c) To provide guidance on surface finish by “sight and feel“ to minimize misunderstandings which may
19、occur between purchaser and manufacturer. 1. SCOPE 1.1 This surface quality Standard Practice provides criteria for the visual and tactile evaluation of cleaned AS-CAST surface finishes of components manufactured from castings. 1.2 This Standard Practice and its supporting MSS Cast Surface Comparato
20、r may be applied to surfaces formed by any casting method. 1.3 This Standard Practice provides visual and tactile criteria for evaluating casting surface finish and texture, which can be used to develop an acceptable quality level. 1.4 Cast surfaces on materials such as gray iron, ductile iron, bron
21、ze, and malleable iron may be compared with the use of this Standard Practice; however, it is not the intention of this Standard Practice to limit comparisons to only these types of materials. 1.5 This Standard Practice does not apply to machined surfaces or those surfaces that are intended to be ma
22、chined. 1.6 This Standard Practice is limited to “sight and feel“ by comparison without measurement. Luster and color are not part of this Standard Practice. 1.7 This Standard Practice is not intended for use on those castings where burn-in, slag, scabs, etc. so distort the surface that the comparat
23、or cannot be used and the casting may be rejected for other causes. 2. DEFINITIONS 2.1 Refer to ASME B46.1, “Surface Texture (Surface Roughness, Waviness, and Lay)”. 3. CAST SURFACE FINISH 3.1 General There are many methods of measuring cast surface finishes to establish a criteria for quality accep
24、tance limits. These are primarily by measurement or pictures. See the references listed in Annex A of this Standard Practice for other inspection methods; including ASTM A802, MSS SP-53, MSS SP-55, and MSS SP-93. 3.2 Cast surface finishes involve texture, roughness, waviness, lay, and flaws. For def
25、initions and other actual measurement methods for various surface irregularities refer to ASME B46.1 or any of the other referenced standards. 3.3 The casting method and material used will influence the surface roughness. Consideration must be given to the actual acceptable surface finish and its fi
26、nal function. A mutual agreement should be made between purchaser and manufacturer. MSS STANDARD PRACTICE SP-1122 3.4 The degree of roughness forms the criteria of this Standard Practice. Through the use of the MSS Cast Surface Comparator and its 10 three-dimensional tactile surface representations,
27、 an acceptable cast surface finish can be evaluated and agreed upon by purchaser and manufacturer. 4. MSS CAST SURFACE COMPARATOR 4.1 The MSS Cast Surface Comparator is a standardized, economical, durable, and convenient “pocket size“ evaluation tool for the inspection and quality acceptance of cast
28、 surface finishes. 4.2 The MSS Cast Surface Comparator was designed and manufactured using actual representative samples of cast surfaces. Numbers were then assigned to establish the degree of roughness. 4.3 Neither optical magnifiers nor measuring instruments are required to perform the surface ins
29、pection. It is a visual and tactile method. If magnifiers or measuring instruments are used, these shall not determine acceptance or rejection. 4.4 The MSS Cast Surface Comparator is a molded-plastic three-dimensional tactile representation of AS-CAST surface finishes, with numbers ranging from 1 th
30、rough 10, representing smooth-to-rough. The surface texture roughness of a surface which needs to be qualified is rated by means of comparison to the MSS Cast Surface Comparator. Visual and tactile comparisons can be made by using this Surface Comparator and its 10 tactile finish rating swaths. See
31、Figure 1 for an illustration of the actual plastic MSS Cast Surface Comparator. 4.5 Casting surface roughness acceptance levels can be established through the use of the MSS rating numbers 1 through 10, regardless of casting method and/or material. A comparison can be designated by an acceptable MSS
32、 number and/or range between numbers. The lower the MSS number, the smoother is the surface finish. 5. PROCEDURE 5.1 General The quality acceptance level should be established by prior agreement of the purchaser and manufacturer and be based on the intended use and function of the casting. Requireme
33、nts for some areas of the castings may be for cosmetic appearance, rather than function. The MSS number selected can either be a maximum or a minimum. The cast surface finish required can also be designated as between two MSS rating numbers. It may be desirable to establish different MSS numbers for
34、 different areas of a casting. This is based on whether the entire casting should have the same general surface smoothness requirement or if certain areas are more or less critical than others. 5.2 Cleanliness The cast surface to be inspected should be clean and free of dirt, oil, loose sand, or oth
35、er foreign material that would impair an accurate determination of the surface finish. 5.3 Surface Evaluation Place the MSS Cast Surface Comparator (see Section 4) near the surface to be inspected. By “sight and feel”, compare the casting surface to the comparator surface, utilizing the quality acce
36、ptance level established in Section 5.1. Luster and color should not be a consideration; only roughness. 6. ACCEPTANCE OR REJECTION Based on the surface evaluation in Section 5 and an agreed upon surface roughness level, the cast part shall be accepted or rejected. MSS STANDARD PRACTICE SP-1123 SMOO
37、TH ROUGH Level of Surface Finish Comparator Material: Molded Durable Plastic; 1/8 in. Thick; Color is Gray FIGURE 1 MSS Cast Surface Comparator (For Visual and Tactile Inspection) NOTE: Figure 1 is for illustrative purposes only. The actual comparator must be utilized for inspection purposes. MSS ST
38、ANDARD PRACTICE SP-1124 ANNEX A Referenced Standards and Applicable Dates This Annex is an integral part of this Standard Practice and is placed after the main text for convenience. Standard Name Description ASME; ANSI/ASME B46.1-2009 Surface Texture (Surface Roughness, Waviness, and Lay) ASTM A802-
39、95(2015) Standard Practice for Steel Castings, Surface Acceptance Standards, Visual Examination MSS; ANSI/MSS SP-53-2012 Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings and Other Piping Components Magnetic Particle Examination Method SP-55-2011 Quality Standard for Ste
40、el Castings for Valves, Flanges, Fittings, and Other Piping Components Visual Method for Evaluation of Surface Irregularities SP-93-2014 Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings, and Other Piping Components Liquid Penetrant Examination Method Publications of the
41、 following organizations appear in the above list: ASME American Society of Mechanical Engineers Two Park Avenue New York, NY 10016-5990 ASTM ASTM International 100 Bar Harbor Drive, P.O. Box C700 West Conshohoken, PA 19428-2959 MSS Manufacturers Society of the Valve and Fittings Industry, Inc. 127
42、Park Street, NE Vienna, VA 22180-4602 Purchase or View a Full Listing of MSS Standards: http:/msshq.org/Store/PriceList.cfm MSS Standard Practices (SPs) related to or referenced in this publication: MSS SP-53 Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings and Other Pi
43、ping Components Magnetic Particle Examination Method ANSI/MSS SP-55 Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components Visual Method for Evaluation of Surface IrregularitiesMSS SP-93 Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fit
44、tings, and Other Piping Components Liquid Penetrant Examination Method American National Standards Published by MSS, an ANSI-accredited Standards Developer:ANSI/MSS SP-25 Standard Marking System for Valves, Fittings, Flanges, and UnionsANSI/MSS SP-44 Steel Pipeline FlangesANSI/MSS SP-55 Quality Stan
45、dard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components Visual Method for Evaluation of Surface IrregularitiesANSI/MSS SP-58 Pipe Hangers and Supports Materials, Design, Manufacture, Selection, Application, and InstallationANSI/MSS SP-96 Guidelines on Terminology for Valve
46、s and Fittings ANSI/MSS SP-114 Corrosion Resistant Pipe Fittings Threaded and Socket Welding Class 150 and 1000ANSI/MSS SP-134 Valves for Cryogenic Service, including Requirements for Body/Bonnet ExtensionsANSI/MSS SP-135 High Pressure Knife Gate Valves ANSI/MSS SP-138 Quality Standard Practice for
47、Oxygen Cleaning of Valves and FittingsANSI/MSS SP-144 Pressure Seal Bonnet Valves Do not violate copyright laws All Standard Practices are officially available only from MSS and through our authorized distributors: About MSS The Manufacturers Standardization Society (MSS) of the Valve and Fittings I
48、ndustry is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Pipe Fittings, Flanges, Pipe Hangers and Supports, and Associated Seals. Since its establishment in 19
49、24, MSS has been dedicated to developing standards for national and global applications, in cooperation with other standardizing bodies and regulatory authorities. For more information on membership and eligibility requirements, visit: http:/msshq.org/Store/Membership.cfm Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE, Vienna, VA 22180-4620 Phone (703) 281-6613 Fax (703) 281-6671 “The Technical Voice of the Industry” IHS MSS SP-112-2016
