1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-20769-4 SANS 1056-1:2008Edition 1.3Any reference to SABS 1056-1 is deemedto be a reference to this standard(Government Notice No. 1373 of
4、8 November 2002)SOUTH AFRICAN NATIONAL STANDARD Ballvalves Part 1: Fire-safe valves Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 1056-1:2008
5、Edition 1.3 Table of changes Change No. Date Scope Amdt 1 1987 Amended to change the designation of classes of valve, to include a new nominal size of valve and to change certain dimensions. Amdt 2 1990 Amended to change the designation of the various classes of valve and to allow for additional cla
6、sses; add a requirement for flange faces; clarify the requirement for security of stems and to amend figure 1 accordingly, and change a definition. Amdt 3 2008 Amended to change the designation of SABS standards to SANS standards, to update the definition of “acceptable“ and the referenced standards
7、, and to delete reference to the standardization mark. Foreword This South African standard was approved by National Committee StanSA SC 5120.12E, Water and sanitation Equipment and systems Reticulation valves, in accordance with procedures of Standards South Africa, in compliance with annex 3 of th
8、e WTO/TBT agreement. This document was published in April 2008. This document supersedes SABS 1056-1:1990 (edition 1). A vertical line in the margin shows where the text has been technically modified by amendment No. 3. SANS 1056-1:2008 Edition 1.3 1 Contents Page Foreword 1 Scope . 3 2 Definitions
9、3 3 Requirements . 4 4 Packing and marking . 10 5 Inspection and methods of test 11 5.1 Inspection 11 5.2 Hydrostatic pressure test 11 5.3 Durability test 11 5.4 Flame test 12 5.5 Test for electrical resistance . 12 Figures 1-3 . 14-16 Appendix A Applicable standards 17 Appendix B Notes to purchaser
10、s . 18 Appendix C Quality evaluation of fire-safe ballvalves produced to the requirements laid down in this part of the specification . 19 SANS 1056-1:2008 Edition 1.3 2 This page is intentionally left blank SANS 1056-1:2008 Edition 1.3 3 Ballvalves Part 1: Fire-safe valves 1 Scope 1.1 This part of
11、the specification covers the requirements for ballvalves of nominal sizes 8-400 mm and of seven classes, intended for use as fire-safe valves. Amdt 2 NOTE a) The standards referred to in this part of the specification are listed in appendix A. b) Requirements that must be specified by the purchaser
12、and those that must be agreed upon between the manufacturer and the purchaser are listed in appendix B. c) Information regarding the verification of the quality of ballvalves produced to this part of the specification and a sampling plan that could be used to assess compliance with this part of the
13、specification of a lot of fire-safe ballvalves are given in appendix C. 2 Definitions 2.1 For the purposes of this part of the specification the following definitions shall apply: acceptable acceptable to the authority administering this standard, or to the parties concluding the purchase contract,
14、as relevant Amdt 2; amdt 3 full bore descriptive of a ballvalve in which the nominal diameters of the end port, the throat port, and the bore of the ball (see figure 1) are the same nominal size the nominal size of the pipe for which the valve is intended one-piece construction descriptive of a ball
15、valve that has a body manufactured as a unit pressure temperature rating the working pressure of a ballvalve, expressed in megapascals, at a specific operating temperature SANS 1056-1:2008 Edition 1.3 4 reduced bore descriptive of a ballvalve in which the nominal diameter of the end port exceeds tha
16、t of the throat port and the bore of the ball (see figure 1) split-body construction descriptive of a ballvalve that has a body consisting of two or more parts that are joined by screwing or by bolting 3 Requirements 3.1 Classification 3.1.1 Class The class of the ballvalve shall be 125; 150; 300; 6
17、00; 900; 1 500 or 2 500, representing nominal cold working pressures of 1,6; 2; 5; 10; 15; 25 and 42 MPa, respectively. NOTE The relevant primary service pressure ratings are given in BS EN 1759-1. Amdt 2; amdt 3 3.1.2 Pressure temperature rating 3.1.2.1 Flange pressure temperature rating The pressu
18、re temperature rating of the flanges of the valve shall be as given in BS EN 1759-1, appropriate to the type of steel used. Amdt 2; amdt 3 3.1.2.2 Seat pressure temperature rating The pressure temperature rating of the seat of a valve shall be at least the value given in table 1 for the nominal size
19、 of valve required. Table 1 Minimum pressure temperature ratings for valve seats of virgin unfilled PTFE 1 2 3 4 5 6 7 8 9 10 11 12 Minimum pressure temperature rating MPa* Nominal size Operating temperature mm C Full bore valves Reduced bore valves Up to 40 50 75 90 100 125 150 175 200 230 8-20 25-
20、65 80-100 15-25 32-80 100-150 6,9 5,0 4,2 6,6 4,9 4,2 5,6 4,8 4,2 5,1 4,8 4,2 4,7 4,7 3,9 3,8 3,8 3,2 2,9 2,9 2,4 2,0 2,0 1,7 1,1 1,1 0,9 0 0 0 150 200-400 200-250 300-400 3,1 2,1 3,1 2,1 3,1 2,1 3,1 2,1 2,9 2,0 2,3 1,6 1,8 1,2 1,2 0,8 0,7 0,5 0 0 * Derived from the cold working pressure of the valv
21、e. Higher ratings may be used when so recommended by the ballvalve manufacturer. The ratings are non-shock pressure ratings. SANS 1056-1:2008 Edition 1.3 5 3.2 Nominal size1)A ballvalve shall be of one of the following nominal sizes: 8 mm, 10 mm, 15 mm, 20 mm, 25 mm, 32 mm, 40 mm, 50 mm, 65 mm, 80 m
22、m, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, or 400 mm. Amdt 1 3.3 Design The design of a ballvalve shall be acceptable and shall incorporate a combination of the following alternatives: a) full bore or reduced bore; b) hollow ball or cylindrical bore ball; c) one-piece construction or split-b
23、ody construction (see figures 2 and 3); d) seat-supported ball or trunnion-supported ball; and e) in the case of class 20 reduced-bore valves, the pattern, i.e. medium or short (see table 2). Unless otherwise required, a ballvalve shall be bi-directional. NOTE The advice of the manufacturer should b
24、e sought with regard to the choice of bi-directional ballvalves since certain pressure hazards are inherent in these valves. 3.4 Materials 3.4.1 Body assembly The body, body connector, and when and as relevant, the insert and cover shall be of the material agreed upon. 3.4.2 Ball, stem (or ball shan
25、k), trunnion, and gland These components shall be of stainless steel, or of a high carbon steel (or other such steel), of a quality as agreed upon. A component made of a material that is not inherently corrosion-resistant shall be so treated as to render it corrosion-resistant. 3.4.3 Operating membe
26、r An operating member shall be of metal and, if of a malleable cast iron, shall comply with at least the requirements of SANS 1190 for grade B340 castings. 3.4.4 Bolts and nuts Bolts and nuts used on components under pressure shall comply with the relevant requirements of SANS 1700-7-1 for grade 8.8
27、. Amdt 3 1) The 8 mm, 10 mm, 15 mm, 20 mm, 25 mm, 40 mm, 50 mm, 65 mm, 80 mm, 100 mm, and 150 mm nominal sizes correspond to the in, in, in, in, 1 in, 1 in, 2 in, 2 in, 3 in, 4 in, and 6 in nominal screw thread sizes referred to in SANS 1109-1. Amdt 3 SANS 1056-1:2008 Edition 1.3 6 3.4.5 Seals and g
28、askets Seals and gaskets shall be of materials that are suitable for use at operating temperatures not exceeding 230 C (as agreed upon) and for the purpose for which the valves are intended to be used. NOTE Free chlorides in compressed fibre reinforced cement materials, when used with low alloy or a
29、ustenitic stainless steels, may cause stress corrosion cracking in the flanges and the use of alternative gasket materials should be considered. 3.4.6 Body seat rings Unless the use of another material is agreed upon, body seat rings shall be of a virgin PTFE oil-free resin without filler materials.
30、 Reclaimed PTFE is not acceptable. 3.5 Dimensions 3.5.1 Overall length of flanged-end valves The face-to-face dimension of a flanged-end valve incorporating raised face flanges shall conform to the appropriate value given in table 2, appropriate to the pattern required. Amdt 2 Table 2 Face-to-face d
31、imensions of valves with raised face flanges Amdt 2 1 2 3 4 5 6 7 8 9 10 Overall length* mm Class 125 Class 150 Class 300 Class 600 Class 900 Class 1 500 Class 2 500 Size Reduced bore mm Reduced bore Short pattern Long pattern Full bore Reduced and full bore 15 20 25 108 117 127 108 117 127 108 117
32、127 140 152 165 165 190 216 254 254 32 40 50 140 165 178 140 165 178 203 140 165 203 178 190 216 229 241 292 279 305 368 279 305 368 451 65 80 100 190 203 229 190 203 229 222 241 305 222 241 305 241 283 305 330 356 432 419 381 457 419 470 546 508 578 673 150 200 250 267 292 330 267 292 330 394 457 5
33、33 394 457 533 403 419 457 559 660 787 610 737 838 705 832 991 914 1 022 1 270 300 350 400 356 381 406 356 381 406 610 686 762 610 686 762 502 762 838 838 889 991 965 1 029 1 130 1 130 1 257 1 384 1 422 * Subject to the appropriate of the following tolerances in accordance with ASME/ANSI B16.10: a)
34、for valves of nominal size not exceeding 250 mm: 1,6 mm; and b) for valves of nominal size exceeding 250 mm: 3,2 mm. 3.5.2 Diameters of body ports and ball bore The diameter of the throat port, body ports and the ball bore of a valve shall conform to the appropriate values given in table 3. Amdt 1 S
35、ANS 1056-1:2008 Edition 1.3 7 Table 3 Minimum diameter of throat port, body port and ball bore Amdt 1 1 2 3 Minimum diameter mm Nominal size of valve mm Reduced-bore valves: Throat port and ball bore* Full-bore valves: Body ports and ball bore 8 10 15 6 7 9 7 9 12 20 25 32 12 18 22 18 22 29 40 50 65
36、 29 36 48 36 48 58 80 100 150 58 76 95 76 95 142 200 250 300 142 187 237 187 237 285 350 400 285 332 332 380 * The ball bore of a reduced-bore valve is of equal diameter to that of a full-bore valve of the next smaller nominal size. 3.5.3 End dimensions of valves with screwed or socket-welded ends s
37、ee also 3.6.5(a) and (d) a) The effective thread lengths on the screwed ends of valves shall conform to the appropriate values given in SANS 1109. b) The internal depth, the bore, and the outside diameter of the sockets on socket-welded end valves shall conform to the appropriate values given in tab
38、le 4. Table 4 Socket-welded end dimensions 1 2 3 4 5 Bore of socket Nominal size Internal depth of socket mm Outside diameter* of socket at welded end mm mm, min. Min. Max. mm 15 20 25 10,0 13,0 13,0 21,80 27,40 34,10 22,05 27,65 34,35 29,00 35,00 43,00 32 40 50 13,0 13,0 16,0 42,70 49,00 61,00 42,9
39、5 49,25 61,25 54,00 58,00 71,00 * Tolerance on outside diameters: 0,25 mm. SANS 1056-1:2008 Edition 1.3 8 3.6 Construction 3.6.1 Castings Metal castings shall be sound, dense, and free from laps, blow holes, and pitting on both inside and outside surfaces. The surfaces of a casting shall be clean, s
40、mooth, and free from sand; and castings shall not be burned, plugged, stopped, or patched. Upgrading shall be allowed. 3.6.2 Forgings Metal forgings shall be sound, dense, smooth, free from laminations, and well finished. 3.6.3 Welding The type of material and the process used shall be such as to en
41、sure that each weld has an acceptable finish that is free from porosity, weld spatter, and undercut, and is an approved grade B weld in terms of SANS 15614-1. Amdt 3 3.6.4 Machining When applicable, machined surfaces shall be accurately and smoothly finished to tolerances acceptable for the function
42、. 3.6.5 End connections The inlet and the outlet of a valve shall be provided with one of the following types of end connections: a) In the case of a valve of nominal size not exceeding 50 mm, a right-hand internal thread of size equal to the nominal size of the valve and complying in all respects w
43、ith the relevant requirements of SANS 1109. b) A flange that, unless otherwise required, complies with the requirements for flanges of the appropriate material of BS EN 1759-1. The flange shall be integral (i.e. in one piece) with the body, and its face shall be normal to the axis of the body with b
44、olt holes straddling the vertical centre-line of the valve. The flange face shall be plain or raised, as agreed upon. Amdt 2; amdt 3 c) A butt-welded end intended for assembly in a bevel-ended pipe of the same nominal size, and that complies with the requirements of BS 1600. Amdt 3 d) In the case of
45、 a valve of nominal size not exceeding 50 mm, a socket-welded end intended for assembly to a plain-ended pipe of the appropriate nominal size, and that complies with the requirements of BS 1600. Amdt 3 3.6.6 Alignment Any axial misalignment of the ball and the inlet and outlet of an assembled valve
46、shall, unless otherwise agreed upon, not exceed the appropriate of the following values: a) Valves of nominal size not exceeding 150 mm: 0,5 mm. b) Valves of nominal size at least 200 mm: 1,0 mm. SANS 1056-1:2008 Edition 1.3 9 3.6.7 Operating members 3.6.7.1 General An operating member shall rotate
47、in a clockwise direction when moving the ball to the closed position of the valve. The operating member shall be easily replaceable without the valve having to be removed from the pipe network in which it is installed. 3.6.7.2 Wrenches A wrench shall a) be of such length and so fitted that, when flu
48、id pressure on the closed valve is at full rated differential, the force required to rotate the ball in either direction does not exceed 350 N; b) in the case of valves of size at least 40 mm, be fitted with a stop or stops on the stem to restrain the rotation of the ball beyond the fully closed or
49、fully open position of the valve; c) be rounded off at the edges or so acceptably covered as to protect the hands of the valve operator, and be of such design as to provide an acceptable clearance between the wrench and the nearest part of the body; and d) be of such design that, in the case of a valve not fitted with a permanent open/closed indicator, it can be fitted in only such a way that it lies parallel to the flow when the valve is open, and at right angles to the flow when the valve is closed. 3.6.7.3 Handwheels A
