1、 STDDMSS SP-42-ENGL 2999=5770640 05DLLBO O29=MSS SP-42-1999 Class 150(PN 20)Corrosion Resistant Gate,Globe,Angle and Check Valves with Flanged and Butt Weld Ends Standard Practice Developed and Approved by the Manufacturers Standardization Society of the Valve and Fittings,Industry,Inc.127 Park Stre
2、et,N.E.Vienna,Virginia 221 80 COPYRIGHT Manufacturers Standardization Society of the Valve and FittingsLicensed by Information Handling ServicesCOPYRIGHT Manufacturers Standardization Society of the Valve and FittingsLicensed by Information Handling Services STD*MSS SP-42-ENGL 1999=5770b40 050LL81 T
3、b5 MSS STANDARD PRACTICE SP-42 An MSS Standard Practice is intended as a basis for common practice by the manufacturer,the user,and the genera1 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
4、.Mandatory conformance is established only by reference in a code,specification,sales contract,or public law,as applicable.This document has been substantively revised from the previous edition.It is suggested that if the user is interested in knowing what changes have been made,direct page by page
5、comparison should be made of this document with the 1995 edition.Any part of this standard may be quoted.Credit lines should read Extractedfrom MSS SP-42,2000,with permission o f the publishel;t h Manufacturers Standardization Society.Reproduction prohibited under copyright convention unless written
6、 permission i s granted by the Manufacturers Standardization Society of the Valve and Fittings Industy,Inc.Unless otherwise specifically noted in this MSS SP,any standard referred to herein is identified by the date of issue that was applicable to the referenced standard(s)at the date of issue of th
7、is MSS SP.See Annex B.Originally Approved October 1949 Copyright 0 1985 by Manufacturers Standardization Society of the Valve and Fittings Industry,Inc.Printed in U.S.A.i COPYRIGHT Manufacturers Standardization Society of the Valve and FittingsLicensed by Information Handling ServicesCOPYRIGHT Manuf
8、acturers Standardization Society of the Valve and FittingsLicensed by Information Handling ServicesSTDaMSS SP-42-ENGL 1999 W 5770640 050LL82 9TL W MSS STANDARD PRACTICE SP-42 CONTENTS Section Page 1.SCOPE.1 2.STANDARD UNITS.1 3.MATERIALS.2 4.DESIGN.3 5.PRESSURE-TEMPERATURE RATINGS.6 6.WORKMANSHIP.7
9、7.TESTS.7 8.MARKING.7 9.PAINTING.7 TABLE 1.MATERIALS.2 2-FLANGE DIMENSIONS.3 3-STUFFING BOX DIMENSIONS.4 4-PRESSURE TEMPERATURE RATINGS.5 FIGURE 1-GATE VALVES.8 2-GLOBE VALVE.8 3-Y-PAlTERN GLOBE VALVE.8 4-ANGLE VALVE.8 5-LIFT-CHECK BOLTED COVER PLATE.9 6-SWING CHECK BOLTED COVER PLATE.9 7-Y-PATERN S
10、WING CHECK THREADED COVER PLATE.9 8-Y-PATTERN SWING CHECK BOLTED COVER PLATE.9 8 ANNEX A:FIGURES.8 B:REFERENCED STANDARDS.10.11 COPYRIGHT Manufacturers Standardization Society of the Valve and FittingsLicensed by Information Handling ServicesCOPYRIGHT Manufacturers Standardization Society of the Val
11、ve and FittingsLicensed by Information Handling ServicesSTDmMSS SP-42-ENGL 1999 5770640 0501183 838 9 MSS STANDARD PRACTICE SP-42 CLASS 150,CORROSION RESISTANT GATE,GLOBE,ANGLE AND CHECK VALVES WITH FLANGED AND BUTT WELD ENDS 1.SCOPE 1.3.2 Nominal Pipe Sizes 1.1 This Standard Practice is intended to
12、 provide a vehicle for the standardization,to the extent in-dicated,of those features of the valves covered herein.The valves are made from corrosion resis-tant alloys whose properties are uniquely suited to the service into which they are placed.Chemical process and cryogenic fluid service constitu
13、te two such applications.1.2 This Standard Practice covers corrosion resis-tant alloy gate,globe,angle and check valves con-forming to ASME B16.34 with flanged and butt weld ends with pressure containing parts made from the alloys listed herein or in ASME B16.34.1.3 Valve Tvpes and Size S 1.3.1 Type
14、s.The following valve types are cov-ered herein and are illustrated in Figures 1 through 8 in Annex A.)a)Gates,outside screw and yoke design(OS&Y).b)Globes,T,Y-pattern and angle,outside screw and yoke(OS&Y).c)Checks,lift,swing and Y-pattem.a)NPS 1/4 through 24(DN 8 through 600)gate valves.b)NFS 1/4
15、through 24(DN 8 through 600)globe and angle valves.c)NPS 1/2 through 24(DN 15 through 600)Y-pattern globe valves.d)NPS 114 through 24(DN 8 through 600)lift check valves.e)NPS 1/2 through 24(DN 15 through 600)swing check valves.2.STANDARDUNITS The values stated in either U.S.customary units or metric
16、 units are to be regarded separately as the standard.Within the text,the metric units are shown in parentheses.The values stated in each system are not exact equivalents;therefore,each system must be used independently of the other.Combining values from the two systems may re-sult in nonconformance
17、with this standard.(a)The valve sketches in Annex A are for the pur-pose of illustration and nomenclature only.They do not represent any manufacturers product.1 COPYRIGHT Manufacturers Standardization Society of the Valve and FittingsLicensed by Information Handling ServicesCOPYRIGHT Manufacturers S
18、tandardization Society of the Valve and FittingsLicensed by Information Handling ServicesMSS STANDARD PRACTICE SP-42 3.MATERIALS 3.1 General.The specific body,bonnet or cover plate and bolting matenal shall be produced in accordance with the applicable ASTM Specifica-tion listed herein or in materia
19、ls group 2,3,or 4 of ASME B 16.34.Users are cautioned against appli-cations with fluid which may react harmfully with any materials used in these valves.Consultation with the manufacturer is advised to determine suit-ability in cases of doubt.3.2 Castings.Bodies,bonnets and cover plates shall be mad
20、e of materiais conforming to the requirements of specifications listed in Table 1.Other parts in con-tact with the contained fluid shall be of material com-parable to the body material.All castings shall be clean,sound and shall be produced to the quality level represented by MSS SP-55.3.3 Investmen
21、t Casting&When investment cast-ings are used for bodies,bonnets,cover plates or other pressure components of valves in sizes 4 NPS(DN 100)and smaller,the requirements of the ASTM specifications referred to in Table 1 shall be met except that it is permissible to determine mechanical and chemical pro
22、perties from a mas-ter heat and to use a 1 inch x 0.25 inch diameter(30mm x 6mm diameter)tensile specimen in place of the standard 2-inch(62.5mm)tensile specimen.A master heat is previously refined metai of a single furnace charge.Tensile specimens shall be cast in molds of the same refractory as th
23、e casting and shall be heat treated with the casting.3.4 Wrought-Parts.Stems,packing glands and other wrought parts in contact with the contained fluids shall be of materials comparable to the body and as listed in Table 1.3.5 Fabrication by Weldino,3.5.1 Vaive bodies,bonnets or cover plates fabri-c
24、ated by welding shall be in accordance with para-graph 2.1.5 of ASME B 16.34.3.5.2 Welding procedures and welders shall be qualified in accordance with ASME Boiler and Pressure Code,Section M.3.5.3 Where maximum corrosion resistance of welded austenitic stainless steel is desired it is advisable to
25、heat treat in such a fashion as to place all chromium carbide in solution.See Para.UHA-105 in Section VID-DIV.1 of the ASME Boiler and Pressure Vessel Code for guidance on post weld heat treatment.3.6 Bolting.Body-Bonnet and Body-cover plate bolts or studs shall be ASTM Al93-Grade B8 or B8M.Nuts for
26、 body-bonnet bolting shall be ASTM A194,Grade 8,8M or 8F.Gland bolting shall be Type 303,304,305,or 3 16 conforming to ASTM A193,A194,or A276.TABLE 1-MATERIALS(a)ASME B16.34,Table 1 Material Group Number(b)Not to be used for pressure boundary items including bodies,bonnets and caps.2 COPYRIGHT Manuf
27、acturers Standardization Society of the Valve and FittingsLicensed by Information Handling ServicesCOPYRIGHT Manufacturers Standardization Society of the Valve and FittingsLicensed by Information Handling ServicesSTD-MSS SP-42-ENGL 1999 W 5770b40 050LL85 bo0 W MS S STANDARD PRACTICE SP-42 3.7 Handwh
28、eels.Handwheels shall be of steel,malleable iron,ductile iron or aluminum.They shall be of the spoked or cover material is not in the same material group as the body,its wall thickness shall support the pressure-temperature rating of the body.3.8 Gaskets.Body-bonnet and body cover plate gaskets shal
29、l be suitable for the applicable ratings listed herein,and for service with the types of fluids for which the valves are intended to be used.4.2.2 Additional metal thickness as needed for assembly,closing stresses,shapes other than cir-cuiar,and stress concentrations shall be provided to meet the re
30、quirements of Subsection 4.1.4.DESIGN 4.3 End Flanges 4.1 General.Valves shall be designed so that dur-ing testing,permanent distortion of body,bonnet,coverplate or seat faces does not occur to the ex-tent that valve function is impaired.4.2 Wall Thickness 4.2.1 The minimum wall thickness of the bod
31、y,bonnet,and coverplates sha be in accordance with ASME B16.34.The body wall thickness governs the pressure-temperature rating.If the bon-4.3.1 End flanges shall be integrally cast with the valve body or may be attached by welding.Weld-ing shall be in accordance with subsection 3.5.4.3.2 The outside
32、 diameter,thickness,raised face diameter,number,size and location of bolt holes and tolerances of end flanges shall be in accor-dance with ASME B16.5.The integral flange di-mensions listed in Table 2 shall be used for sizes NPS 1/4 through NPS 3/4(DN 8 through DN 20)which are not listed in ASME B16.
33、5.TABLE 2-FLANGE DIMENSIONS I-Ic+-See Subsection 4.3.2 for tolerances.(a)Bolt holes for valves are located to straddle the center line(b)Dimensions for all larger sizes are per ASME B16.5.3 COPYRIGHT Manufacturers Standardization Society of the Valve and FittingsLicensed by Information Handling Serv
34、icesCOPYRIGHT Manufacturers Standardization Society of the Valve and FittingsLicensed by Information Handling Services STD*MSS SP-42-ENGL 2999 5770640 0501iI8b 547 W MSS STANDARD PRACTICE SP-42 4.3.3 The flange face finish shall be in accordance with ASME B16.5.4.3.4 Spot facing is not necessary pro
35、vided that the back side of the end flange is parallel to the flange face within 1 degree.Spot facing,if used,shall be in accordance with MSS SP-9.U.S.Customary Units Valve Size,NPS 1/2 3/4 1 1 1/4 1 1/2 2 Face-to-Face,in.4.50 5.00 5.75 6.50 7.25 8.50 Metric Units ValveSize,DN 15 20 25 32 40 50 Face
36、-to-Face,mm.114 127 146 165 184 216 4.4 Weld Ends.Butt weld end dimensions and contour shall be as specified in ASME B16.25.The pipe schedule number shall be 40s in accor-dance with ASME B 16.39M,unless otherwise specified in the Purchase Order.4.5 Face-to-Face and End-to-End Dimensions.The face-to-
37、face dimensions of valves shall be intaccordance with ASME B 16.10 except for T pattern swing check valves with threaded cover plates as illustrated in Annex A,Figure 7.The face-to-face dimensions of Y pattern swing check valves with threaded cover plates shall be as follows:4.6 Wedges and Discs.Gat
38、e valve wedges may be solid,split or double type.Solid wedges may be either plain having an I-shaped cross section or a tapered H,or inverted U cross section.Globe,angle,and lift check valve discs may be plug or spherical type or non-metallic.Swing check valve discs may be metallic with flat faces o
39、r non-me-tallic.Non-metallic discs shall be fitted to disc holders of corrosion resistant metal equal to the body.Wedges and discs of all types shall be prop-erly guided to the seats.TABLE 3-STUFFING BOX DIMENSIONS 1.88 47.6 1.88 47.8 2.63 66.8 318 9.5 2.00 50.8 2.88 73.2 7/16 11.1 2.19 55.6 2.12 53
40、.8 3.00 76.2 7/16 11.1 2.19 55.6 2.25 57.2 3.25 82.6 112 12.7 2.50 63.5 4 COPYRIGHT Manufacturers Standardization Society of the Valve and FittingsLicensed by Information Handling ServicesCOPYRIGHT Manufacturers Standardization Society of the Valve and FittingsLicensed by Information Handling Servic
41、es STD-MSS SP-LiZ-ENGL 1999 m 5770b40 050LL87 483 m MSS STANDARD PRACTICE SP-42 4.7 Seats.Seats may be integral with the valve body.When inserted body seats are furnished,us-ers are cautioned to consider the effects of crevice corrosion.4.8 Glands.Glands shall be bolted type,solid,or two piece desig
42、n.shall provide adequate adjustment for progressive compression of packing material.4.10 Stuffhe-Box.The stuffing box bore for the corresponding stem diameter shall be as listed in Table 3.The nominal stuffing box depth shall be at least equivalent to 5 rings of square packing.4.9 Gland Bolting.Stud
43、s,stud bolts,hinge bolts,or headed bolts through drilled or slotted holes in the packing box flange may be used.In all cases gland bolting shall be securely held in place and 4.1 1 Backseating.All valve types,other than check valves,shall be designed with a backseating feature.Repacking under pressu
44、re is not recom-mended as a normal maintenance procedure.TABLE 4-PRESSURE-TEMPERATURE RATINGS U.S.Customary Units Metric Units 5 Note:(See Subsection 5.3.1 COPYRIGHT Manufacturers Standardization Society of the Valve and FittingsLicensed by Information Handling ServicesCOPYRIGHT Manufacturers Standa
45、rdization Society of the Valve and FittingsLicensed by Information Handling ServicesMSS-STD=MSS SP-42-ENGL 3999 5770b40 0503388 33T STANDARD PRACTICE SP-42 5.4.12 Stems 4.12.1 Stems shall be threaded with single or multiple Acme-type thread or 60-degree thread approximating the Stub form.4.12.2 Gate
46、 valve sterns shall be of sufficient length so as to be at least flush with the top of the stem nut thread after the wedge has worn into its lowest position.4.13 Packins.Stem packing shall be of design and materials suitable for the primary service tempera-ture.4.14 Gaskets.Body-bonnet gaskets may b
47、e either full faced or extending to the inside of the bonnet bolts,or retained in recess in the bonnet flange of the body.PRESSURE-TEMPERATURE RATINGS 5.i General.Hanged end and butt weld end valves covered by this Standard Practice shali be designated as Class 150(PN 20).Except as provided in 5.5,r
48、atings for all valves are the maximum allowable working pressures,expressed as gage pressure,a t the temperatures shown.For intermediate temperatures linear interpolation is permitted.The ratings listed in Table 4 are identical to those listed in ASME B16.34 Class 150(PN 20)Standard Class for the ap
49、plicable materials.5.1.1 Flanged End Valves.Valves conforming to the requirements of this Standard Practice for flanged end valves shall have the ratings as shown in Table 4.For an installed valve to ment the pres-sure-temperature ratings listed herein,the bolting and gaskets for the end flanges mus
50、t be in accor-dance with ASME B 16.5.5.2 The temperatures listed are the material tem-peratures of the pressure retaining structure.In view of the various environments in which piping components may be installed(for example,insu-lated or uninsulated,heated or cooled externally)in establishing pressu
