1、MSS SP-137-2013 Quality Standard for Positive Material Identification of Metal Valves, Flanges, Fittings, and Other Piping Components Standard Practice Developed and Approved by the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE Vienna, Virginia 22
2、180-4602 Phone: (703) 281-6613 Fax: (703) 281-6671 E-mail: standardsmss-hq.org MSS www.mss-hq.org MSS STANDARD PRACTICE SP-137 i 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 i
3、s the resulting efforts of competent and experienced 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
4、, and the general public. 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, speci
5、fication, 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
6、responsibility of the certifier or maker of 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 Prac
7、tice (see Annex A). 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.” By publication of this Standard Practice, no position is taken with respect to the validity of any po
8、tential claim(s) or of any patent rights in 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 Pract
9、ice, all text, notes, annexes, tables, figures, 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”
10、. Note that supplemental information does not include mandatory requirements. Substantive changes in this 2013 edition are “flagged” by parallel bars as shown on the margins of this paragraph. The specific detail of the change may be determined by comparing the material flagged with that in the prev
11、ious edition. Excerpts of this Standard Practice may be quoted with permission. Credit lines should read Extracted from MSS SP-137-2013 with permission of the publisher, Manufacturers Standardization Society of the Valve and Fittings Industry. Reproduction and/or electronic transmission or dissemina
12、tion 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: May 2007 Current Version Approved: October 2012/Updated March 2013 Current Version Publish
13、ed: March 2013 MSS is a registered trademark of Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Copyright , 2013 by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-137 ii TABLE OF CONTENTS SECTIO
14、N PAGE 1 SCOPE . 1 2 DEFINITIONS . 1 3 PROCEDURE 2 4 MATERIAL VERIFICATION 2 5 NON-CONFORMING PARTS . 3 6 DATA REPORTS 3 7 EXAMINER (OPERATOR) QUALIFICATIONS 3 8 SAFETY OF INSTRUMENTATION . 3 TABLE 1A Typical Materials and Elements to be Analyzed 4 1B Typical Pressure Boundary Bolting Materials and
15、Elements to be Analyzed 5 2 Sampling for Valves and Other Multi-Part Products . 6 3 Sample Size Code Letters 7 4 Sampling Plan 7 ANNEX A Referenced Standards and Applicable Dates 8 MSS STANDARD PRACTICE SP-137 1 1. SCOPE 1.1 This Standard Practice provides methods and acceptance standards for Positi
16、ve Material Identification (PMI) of metal flanges, fittings, valves, pressure boundary parts of valves, and other piping components. 1.2 The instrumentation used for PMI testing covered by this Standard Practice shall be optical spectroscopy or X-ray fluorescence. 1.3 This Standard Practice is appli
17、cable to the identification process, at point of final inspection or in-process inspection during manufacturing. 1.4 The PMI test is for material grade identification only and does not substitute for a manufacturers test report or a laboratorys chemical analysis. 2. DEFINITIONS 2.1 Material Test Rep
18、ort (MTR) A certified report from the manufacturer showing the chemical composition, mechanical properties, heat treatment, and testing required on the material for compliance with the requirements of the purchase order or the applicable industry standard that governs the material, or both. 2.2 Posi
19、tive Material Identification (PMI) An examination procedure used to verify material grade type and nominal chemistry of the alloying elements. 2.3 Optical Spectroscopy A method of positive material identification that detects and quantifies the presence of specific elements in a material. It utilize
20、s the fact that each element has a different unique atomic structure that when subjected to the addition of energy, will emit a pattern of light colors or wavelengths along the spectrum. Since no two elements emit the same pattern of spectral lines, they can be differentiated. Since the intensity of
21、 the light is proportional to the quantity of the element in the material, the concentration of the element can be measured and the material identified. 2.4 X-Ray Fluorescence A method of positive material identification that detects the energy strength level of X-rays being emitted from the materia
22、l. Each element in the material emits a different X-ray energy strength level. These different X-ray strength levels are measured and compared to the known energy levels for each element in the material. The instrumentation makes an analysis of the different X-ray energy levels and identifies each a
23、lloy in the material being tested as well as the percent concentration of each element in the material. This identification of the various elements can then be compared to a known standard and the particular grade of material identified. 2.5 Semi-Quantitative Analysis A term used to describe the met
24、hod of positive material identification. This term is used to point out the fact that, while the field use of PMI instrumentation is capable of precision analysis, the measurements are not being carried out under controlled environmental conditions, and therefore, are not certifiable. 2.6 Reference
25、Standard A material sample that has been certified by a laboratory with instrumentation that is qualified in accordance with ASTM International. 2.7 Like Items These are items being of the same material, size, pressure class, and type. 2.8 Assembled Items These are items previously assembled that ar
26、e selected from existing inventory. 2.9 Disassembled Items These are component parts (manufactured or selected from existing inventory) that have not yet been assembled. QUALITY STANDARD FOR POSITIVE MATERIAL IDENTIFICATION OF VALVES, FLANGES, FITTINGS, AND OTHER PIPING COMPONENTS MSS STANDARD PRACT
27、ICE SP-137 2 2.10 Alloy Material A metal that contains alloying elements (e.g. chromium, nickel, or molybdenum) that are intentionally added to enhance mechanical properties or corrosion resistance or both. 3. PROCEDURE 3.1 PMI The identification shall be initiated by ensuring the instrumentation is
28、 within detection limits or calibration curves, or both, prior to analysis of the material. This step is completed by checking the unit with certified reference standards. 3.2 Optical Spectroscopy This shall be the method used when the otherwise non-mandatory analysis for Carbon is required, (e.g. t
29、o separate an H-grade from L-grade austenitic stainless steel). 3.3 X-Ray Fluorescence or Optical Spectroscopy These methods may be used to identify the major alloy elements of a material such as those listed in Tables 1A and 1B. 3.4 Weight Percentage The actual chemical elements in weight percentag
30、es are not required to be reported if the instrumentation is capable of identifying the grade. Whether the analysis is on element weight percentage or a grade identification match, references in Tables 1A or 1B shall be used for the major alloy component identification of the material. If an alloy i
31、s not listed in Table 1A or 1B, the major elements of the material, e.g., Chromium (Cr); Molybdenum (Mo), Nickel (Ni), Titanium (Ti), and Columbium/Niobium (Cb/Nb), shall be the basis for determination of the alloy. 3.5 PMI Examination Unless otherwise specified by the purchase order, and agreed upo
32、n by the purchaser and provider, single component items such as fittings, flanges, or other piping components shall receive 100 percent (100%) PMI examination. Table 2 provides a sampling plan for valves, which shall be used unless otherwise specified and agreed upon by the purchaser and provider. T
33、able 2 also provides for optional levels of examination for valves when agreed to by the purchaser and provider. All parts examined shall be marked with PMI (physical space permitting and non-critical surfaces available) to denote conformance that the part was PMI examined. This PMI marking shall be
34、 permanent on the piece and not removed by installation processes such as welding or weld preparation. PMI stamps, when used, shall be low stress. The type of marking will depend on the product form, but shall be permanent, (e.g., PMI must appear on a cast or forged product). A casting that might ha
35、ve chemical etch markings and forging could have a roll marking. PMI examination may be performed in process or in the final inspection stage after manufacturing. The parts shall be identified as being PMI examined after the inspection results have been verified and accepted to the ASTM Number and G
36、rade marked on or identified to the part. 4. MATERIAL VERIFICATION 4.1 Acceptance Standards The acceptance standards for PMI shall include nominal chemistry verification of the major alloying elements of the material grades listed in Tables 1A and 1B, as compared to the ASTM elemental ranges for the
37、 specification of the product being examined. The acceptable measure of alloy range shall be as specified in the appropriate ASTM specification(1). 4.2 Elemental Percentage Weight If an elemental percentage weight is required for examination, ASTM product analysis tolerances would apply for acceptan
38、ce purposes (e.g., ASTM A960/A960M tolerances would apply for wrought products; ASTM A961/A961M would apply for steel flanges, forged fittings, valves, and parts for piping applications; and ASTM A962/A962M would apply for bolting products). NOTE: (1) PMI using Optical Spectroscopy or X-ray Fluoresc
39、ence methods yields a semi-quantitative analysis considered to be accurate but not to the same precision of chemical laboratory instruments in a controlled environment. MSS STANDARD PRACTICE SP-137 3 4.3 Grade Identification This identification is acceptable if the analysis instrumentation is capabl
40、e of grade identification and the instrumentation is calibrated according to the verification guidelines in Section 3.1. 4.4 Instrument Accuracy Caution is urged when quantifying trace elements present in small concentrations, as they may fall under the instruments limit of detection. The acceptance
41、 criteria in these instances will be as agreed upon between the provider and end user. 5. NON-CONFORMING PARTS Parts not meeting the requirements of Section 4 shall be identified as non-conforming parts. Non-conforming parts may be subjected to a laboratory chemical analysis to verify the accuracy o
42、f the PMI results (if required). Failure of any inspection sample in an inspection lot rejects all items in the lot until individual testing proves a part acceptable. A failed inspection lot will require 100% PMI examination or rejection of the entire lot. 6. DATA REPORTS Either production records,
43、logs, or check lists shall be acceptable as a mandatory record of examination, confirming that the procedure of PMI has been adequately performed on each part, sub-component part, or assembly; provided they contain the following information: a) PMI Instrument (Manufacturer and Model Number) b) Item
44、Description c) ASTM Material Designation/Identification d) Date of Inspection e) Results: Accepted or Rejected (see Section 5) f) Organization Performing Test g) Operator Performing Test h) Element Percentages (see Tables 1A and 1B when required) i) Required By/Purchase Order and Date j) Lot Identif
45、ication Number 7. EXAMINER (OPERATOR) QUALIFICATIONS The examiner (operator) of the PMI instrumentation shall be knowledgeable about the PMI operational functions, the PMI test method employed, and also of the alloys being examined. The qualifications of the examiner, including training from the ins
46、trumentation manufacturer or training by the component manufacturer, shall be documented and be available at the component manufacturers facility. 8. SAFETY OF INSTRUMENTATION This Standard Practice does not address safety concerns with either the Optical Spectroscopy or X-ray Fluorescence methods.
47、It is the users responsibility to adequately address the safety issues of examination and the proper use of the instrumentation. MSS STANDARD PRACTICE SP-137 4 TABLE 1A Typical Materials and Elements to be Analyzed ASME B16.34 Material Groups(1)Major Elements Grade UNS No. Cr Ni Mo Cb/Nb Ti Cu W V F
48、e 1.9 1 Cr, 1/2 Mo F11 K11597 X X 1.10 2 Cr, 1 Mo F22 K21590 X X 1.14 9 Cr, 1 Mo F9 K90941 X X 1.15 9 Cr, 1 Mo, V F91 K90901 X X X 1.17 5 Cr, 1/2 Mo F5 K41545 X X N/A 13 Cr, (410) F6a S41000 X X(3)N/A 13 Cr, 4 Ni (415) F6 NM S41500 X X 2.1/2.3 18 Cr, 8 Ni F304/L/H (2)S30400 S30403 S30409 X X 2.2/2.3
49、 18 Cr, 8 Ni, 2 Mo F316/L/H (2)S31600 S31603 S31609 X X X 2.2 19 Cr, 13 Ni, 3 Mo F317/H (2)S31700 S31703 X X X 2.4 18 Cr, 10 Ni, Ti F321/H (2)S32100 S32109 X X X 2.5 18 Cr, 10 Ni, Cb F347/H (2)S34700 S34709 X X X 2.6 23 Cr, 12 Ni 309H S30909 X X 2.7 25 Cr, 20 Ni 310H S31009 X X 2.8 22 Cr, 5 Ni, 3 Mo F51, F60, 2205 S31803 X X X 2.8 25 Cr, 7 Ni, 4 Mo F53, 2507 S32750 X X X 2.8 20 Cr, 18 Ni, 6 Mo F44, Alloy 254 SMO S31254 X X X 3.1 35 Ni, 35 Fe, 20 Cr, Cb, 3 Cu, 2 Mo Alloy 20 N08020 X X X X X X 3.2 99 Ni Alloy 200 N02200 X 3.
