[www.staffempire.com]-MSS SP-105-1996(R2005) Instrument Valves for Code Applications.pdf

MSS SP-105-1996 Reaffirmed 2005 Instrument Valves for Code Applications Standard Practice Developed and Approved by the Manufacturers Standardization Society of the Valve and Fittings Industry,Inc.127 Park Street,NE Vienna,Virginia 22180 Phone:(703)281-6613 www.mss- Fax:(703)281-6671 e-mail: Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSS STANDARD PRACTICE SP-105 This MSS Standard Practice was developed under the consensus of the MSS Technical Committees 115 and the MSS Coordinating Committee.The content of this Standard Practice is the result of the efforts of competent and concerned volunteers to provide an effective,clear,and non-exclusive specification that will benefit the industry as a whole.This MSS Standard Practice is intended as a basis for common practice by the manufacturer,the user,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 is established only by reference in a code,specification,sales contract,or public law,as applicable.Substantive changes in this 1995 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 previous edition.Other standards documents referred to herein are identified by the date of issue that was applicable to this standard at the date of issue of this standard.See Annex A.This standard shall remain silent on the applicability of those other standards of prior or subsequent dates of issue even though provisions of concern may not have changed.References contained herein which are bibliographic in nature are noted as“supp1ementalin the text.Any part of this standard may be quoted.Credit lines should read extracted from MSS SP-105,1996,Rea$jrmed 2005 with permission of the publisher,the Manufacturers Standardization Society,Reproduction pro-hibited under copyright convention unless written permission is granted by the Manufacturers Standardization Society of the Valve and Fittings Industv,Inc.Originally Approved July 1990 Copyright O,1990 by Manufacturers Standardization Society of the Valve and Fittings Industry,Inc.Printed in U.S.A.1 Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-标准分享网 w w w.b z f x w.c o m 免费下载MSS STANDARD P R A C T I C E SP-105 I CONTENTS I SECTION PAGE 1.SCOPE.1 2.DEFINITIONS.1 3.MATERIALS.1 4 UbSlCiN KbQUlKbMkN IS 2-_.5.QUALIFICATION.3 6.ACCEPTANCE TESTING.5 7.MARKING.5 FIGURE 1.DIRECT MOUNTED INSTRUMENT MANIFOLD GASKET GROOVE AND FLANGE DETAILS.4 ANNEX A.REFERENCED STANDARDS.6 11 Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSS S T A N D A R D P R A C T I C E SP-105 INSTRUMENT VALVES FOR CODE APPLICATIONS 1.SCOPE 2.4.Control piping:Piping used to intercon-nect pneumatically or hydraulically operated control apparatus,or to signal transmission systems.1.1 This Standard Practice applies to small valves and manifolds developed for and pre-dominately used in instrument,control and sampling piping systems.It covers steel and alloy valves of 1”nominal pipe size and smaller,and pressure ratings of 10,000 psi and lower at 100F.1.2 This Standard Practice applies to instru-ment valve designs including but not limited to needle valves,packless valves,ball valves,plug valves,check valves and manifold valves.Instru-ment valves are generally of proprietary design;this Standard Practice is not intended to define or limit designs,construction,performance,envelope dimensions,or valve types.1.3 The application of valve type,size,rating,materials of construction,and suitability for the service are the responsibility of the pur-chaser and are outside the scope of this standard.2.DEFINITIONS 2.1 General.Definitions given in MSS SP-96 apply to this Standard Practice.2.2 Instrument valves:Valves designed for use in instrument,control and sampling piping sys-3.I tems(e.g.see ASME B31.1,Article 122.3).2.3 Instrument piping:Piping used to inter-connect pneumatically or hydraulically operated control apparatus,or to signal transmission systems.2.5 Sampling piping:Piping used for the col-lection of samples(such as steam,water,oil,gas,and chemicals)from process systems.2.6 Manifold valve:Two or more instrument I I valves fabricated into a single valve body.2.7 Cold working pressure rating:The maxi-mum allowable working pressure of a valve at ambient conditions(-20”F to IOOF),abbrevi-ated CWP.2.8 Pressure boundary parts:The following items are defined to be pressure boundary parts.Each item may not apply to all valve designs.a)Body b)Bonnet c.)Union Nut d)Body to Bonnet Bolting e)Body Bolting 2.9 Packless valve:A valve with a diaphrcigm or bellows stem seal instead of a packing or O-ring seal at the stem.MATERIALS 3.1 General.The pressure boundary parts of the valve shall be made of the materials speci-fied herein.3.2 Non-pressure boundary parts(such as the stem,glands,packing nut)shall be made of materials compatible with the pressure bound-ary parts materials.I Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-标准分享网 w w w.b z f x w.c o m 免费下载MSS S T A N D A R D P R A C T I C E SP-105 3.3 The following materials are acceptable for use as pressure boundary parts:l a)Materials listed in ASME/ANSI B16.34 b)Materials listed in ASME B3 1.1 c)Materials listed in ASME B31.3 d)Materials listed in ASME Boiler and Presswe Vesse!Code,Sectim II!.4.1.6 The manufacturer shall provide pressure ratings for temperatures above 100F.This temperature is the temperature of the pressure-containing shell of the component.In general,this temperature is the same as that of the contained fluid.Use of a pressure rating corre-sponding to a temperature other than that of the contained fluid is the responsibiiity of the user,subject io the requirements o appiimbie codes 3.4 Certified material test reports shall be obtained for pressure boundary parts materials.Certifications shall include chemical analysis and mechanical properties.4.DESIGN REQUIREMENTS 4.1 Valves designed in accordance with this practice shall have their working pressure established by calculation,hydrostatic proof and burst tests or both as specified in Section 5.I and regulations.4.2 End connections 4.2.1 Pipe threads.Tapered pipe threads shall be in accordance with one of the following:a)ANSI/ASME B1.20.1 Pipe Threads,General Purpose(Inch)b)ANSI B1.20.3 Pipe Threads,Dryseal(Inch)c)ANSI/CGA V-1 Compressed Gas Cylin-der Valve Outlet and Inlet Connections 4.1.1 Qualification of valves designed to para-graph 4.1 shall be conducted on each design and size of valve to establish the CWP rating.4.2.2 Pipe socket weld connections:The socket bore diameter and the depth of socket shall be in accordance with the dimensions and toler-4.1.2 The CWP rating of valves of identical design and size but made of different materials shall be proportional to the allowable stress of each material or may be determined by hydro-static qualification tests on valves made of each material,at the manufacturers option.4.1.3 The CWP rating of valves of identical design and size but with different end connec-tions shall be determined by the rating of the valve or the end connection,whichever is less.4.1.4 The CWP rating of a valve design may be established by the manufacturer at a value lower than the rating allowed by the qualifica-tion tests of Section 5.In that case the lower pressure rating may be established for a valve design and size,regardless of materials or end connections.Such reduced ratings are usually dictated by performance limitations such as operating torque,cycle life,or non-metallic component limitations.4.1.5 Packing nut adjustment may be necessary to compensate for temperature change.I I I ances of ASME B16.11.4.2.3 Tube socket weld dimensions shall be in accordance with the manufacturers standard.I 4.2.4 Butt weld connections for pipe shall have an end preparation in accordance with ASME B16.25.4.2.5 Butt weld connections for tube shall be in accordance with the manufacturers standard.4.2.6 Pipe or tube stub extension end connec-tions may be socket welded or butt welded to the valve.The diameter and wall thickness shall be the manufacturers standard.The standard stub extension lengths are 3 or 6,measured from the end of the valve.I I 4.2.7 Mechanical tube fittings shall be in accordance with the manufacturers design.Fittings may be machined integral with,welded,or threaded to the valve body.2 Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M S S S T A N D A R D PRACTICE SP-105 5.4.2.8 Weld qualifications for end connections welded to the valve body shall be in accordance with ASME Boiler and Pressure Vessel Code,Section IX.4.2.9 Other end connections not listed herein may be provided as agreed upon by the manu-facturer and purchaser.5.4 Material properties:The actual tensile and yield strength of the pressure boundary parts of the test specimens shall be obtained from heat traceable material certifications or by submitting sample material from the same lot to testing in accordance with the procedures of the ASME Boiler and Pressure Vessel Code,Section VIJI,Article UG-IO1(J).4.3 Direct Mounted Instrument Manifold Gasket Groove and Flange Details:The stand-ard groove for gaskets and minimum flange or plate thickness shall be per Figure 1.Other groove dimensions shall be considered special.QUALIFICATION 5.1 General:Valve designs shall be qualified by calculation and hydrostatic proof or hydro-I static proof and burst tests at the option of the manufacturer.5.2 Documentation 5.2.1 Hydrostatic proof and burst tests shall be conducted in accordance with the manu-facturers written procedure.Copies of the test procedure and test reports shall be kept on file by the manufacturer.5.2.2 Stress and pressure rating calculations shall be in accordance with the methods in this standard practice.Copies of the calculations shall be kept on file by the manufacturer.I 5.3 Test valves:Valves shall have their ratings I confirmed by testing 3 production valves by the method described in paragraph 5.5.I 5.3.1 Similar valves of the same size and design I but having minor modifications,may also be considered qualified.Where those modifications would increase the level of stress in pressure boundary parts the rating must be reduced proportionately to the ratio of the stresses.Stresses are to be calculated as specified in Section 5.8.If the materials have different strengths,the ratio of material allowable stresses shall also be used to determine the new rating.5.5 Proof test procedure 5.5.1 Each test valve shall pass a hydrostatic proof test in accordance with the following minimum requirements:a)Fluid:Water or hydraulic oil b)Temperature:50F to 125F c)Pressure:Two times the CWP rating d)Time:One minute,minimum,at proof pressure e)Position:Placed in all positions capable of subjecting pressure boundary components to internal pressure.I 5.5.2 There shall be no visible leakage during the proof test at any pressure containing part,joint,or seal.I 5.5.3 The stem packing may be adjusted dur-I ing the proof test to stop leakage.No other adjustments are permitted on any other pres-sure boundary joints or seals.I 5.6 Burst test procedure 5.6.1 Each test valve shall be hydrostatically I shell tested to failure by rupture.The hydrostatic I pressure at which rupture occurs shall be recorded.The same valves used for the proof test shall be used for the burst test.5.6.2 Leakage is permitted at the valve pack-ing,gaskets,and pressure retaining joints dur-ing the burst test,at pressures above the proof pressure.5.6.3 If the hydrostatic test is stopped before rupture occurs,the highest sustained pressure attained shall be considered the burst pressure for that valve.3 Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-标准分享网 w w w.b z f x w.c o m 免费下载MSS S T A N D A R D P R A C T I C E SP-105 935 REF-t-.:945:i-t-TYP=015 BREAK EDGE.015 MAX TYP,080 I.085 2 5 p 2 y-j DETAIL A I FIGURE 1-DIRECT MOUNTED INSTRUMENT MANIFOLD GASKET GROOVE I AND FLANGE DETAILS 4 Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MSS S T A N D A R D P R A C T I C E SP-105 5.7 Pressure rating determination:When de-termined by the method of paragraph 5.6,the CWP rating shall be less than or equal to the pressure determined from the burst pressure as follows:P 0.25 B T,/Ta P=CWP Rating B=The lowest burst test pressure re-corded for the three specimens tested Ta=Actual tensile strength of the test specimen T,=Specified minimum tensile strength of the material WHERE 6.7.5.8 Calculations 5.8.I Stress calculations shall be in accordance Sec.III,whichever is applicable.I with ASME B31.1,ASME B31.3,or ASME I 5.8.1.1 No allowance for corrosion need be taken unless required by the user.Where cor-rosion will be present the manufacturer and user may agree to rate the valve based on the anticipated corrosion rate and required length of service.Theyer is responsible for monitor-ing the condition of the valves pressure boundary walls.5.8.3 The working pressure at a temperature other than the CWP is calculated by multiply-ing the CWP by the ratio of the allowable stress at the new temperature divided by the allow-able stress at the CWP,although as in Section 4.1.4,performance limitations may further restrict the working pressure at any given temperature.ACCEPTANCE TESTING Each production valve shall pass a seat leakage test and a shell test in accordance with MSS SP-61.MARKING 7.1 Each valve shall be maked in accordance with MSS SP-25 with at least the following:a)Manufacturers identification b)How direction(if applicable)c)Manufacturers model number d)Material grade(unless coded in model number)7.2 Additional markings may be applied in accordance with MSS SP-25.5.8.2 Allowable stresses shall be in accordance with the Maximum Allowable Stress Tables in I ASME B31.1,ASME B31.3,orASME Sec.III,I whichever is applicable.5 Copyright MSS Provided by IHS under license with MSSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-标准分享网 w w w.b z f x w.c o m 免费下载MSS S T A N D A R D P R A C T I C E SP-105 ANNEX A LIST OF REFERENCED STANDARDS This annex is an integral part of this Standard Practice which is placed after the main text for convenience.List of standards and specifications referenced in this Standard Practice show the year of approval.ANSI B