1、Industrial valves - Valves for chemical and petrochemical process industry - Requirements and tests The European Standm British Standard ICs 23.060.01 EN 12569 999 has the status of a BS EN 125691999 itcOl.pomt.ing conigenda (0s 1 and2 NO COPYING WITHOUT BSI PERMiSSION EXCEPT AS PERMITTED BY COPYRIG
2、HT LAW STD-BSI BS EN 32569-ENGL 1999 m lb2Libb7 0932592 q54 m BS EN 126691999 Amd. No. Date 10959 September CorrigendumNo. 1 2000 National foreword Comments Table 1 amended This British Standard is the English language version of EN 125691999, inchding corrigendum December 1999 and corrigendum Novem
3、ber 2000. The UK participation in its preparation was enirusted by Technical Committee PSW, Valves, to Subcommittee PSW/12, Valves for process indusry, which has the responsibility to: - aid enquirers to understand the te* - present to the responsible European committee any enquiries on the - monito
4、r related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests Wormed; them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secrem. Cross-references The British Standards which
5、implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index“, or by using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not
6、purport to include al the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside fron
7、t cover, the EN title page, pages 2 to 16, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under t
8、he authority of the Standards Committee and comes into effect on 15 December 1999 O BSI A is the cross-sectional area (D x d4), in square millimetres; D is the value of DN, in millimetres. O BSI 06-2001 STDmBSI BS EN 125bS-ENGL 1777 m 1b21(bb7 0712578 772 m Page 6 EN 12569:1999 It is assumed that th
9、e section modulus of the valve is equal to or greater than the adjacent pipe and that the materials strengths are equal. Under these conditions it is assumed that correct function is preserved. For the visual inspection and the non-destructive tests, all pressure retaining parts shall have a surface
10、 finish which makes it possible to conduct the tests in accordance with table I. o When fire test certification is required it shall be specified by the purchaser. Certification shall be in accordance with prEN IS0 10497: 1996 or other standard by agreement. The valve shall be asbestos free. o If th
11、e subcontractors are not certified in accordance with EN IS0 9000 series, (EN IS0 9001, EN IS0 9002, EN IS0 9003, as appropriate), the purchasers can require to be informed about the change of subcontractors for main parts of a valve (e.g. castings, forgings for valves). The purchaser shall be infor
12、med about the use of subcontractors for complete valves. The manufacturer shall ensure in every case the interchangeability of parts. 4.2 Quality assurance 4.2.1 Semi-product manufacturer (e.g. foundry, forge, welding shop) Semi-product manufacturers shall have suitable equipment and qualified perso
13、nnel for proper manufacture of their materials and products. They shall have test equipment for tests according to applicable standards or other required technical specifications. These manufacturers shall ensure the proper manufacture and processing of the materials and products by means of a quali
14、ty assurance system, in accordance with EN IS0 9000 series, (EN IS0 9001, EN IS0 9002, EN IS0 9003, as appropriate) audited at regular intervals by an authorized representative (e.g. notified body). The documentation for materials or semi-products shall be made available to the purchaser on request.
15、 4.2.2 Valve manufacturer The valve manufacturer shall have suitable equipment and qualified personnel for the further processing of the materials or semi-products used. He shall operate a quality assurance system, in accordance with EN IS0 9000 series, (EN IS0 9001, EN IS0 9002, EN IS0 9003, as app
16、ropriate), audited at regular intervals by an authorized representative (e.g. notified body). The purchaser has the right to witness the quality tests at the manufacturers and/or suppliers premises and to carry out quality audits. Documentation shall be made available to the purchaser on request. 4.
17、3 Design 4.3.1 General Valves shall meet the design requirements of their specific product standards, if such exist. Where no applicable product standard exists safe and sound engineering practice, including the application of basic standards for industrial valves, shall apply. The following require
18、ments concerning design shall apply to all valves. O BSI 06-2001 STD-BSI BS EN 125bS-ENGL 1777 1b2Libb7 0722579 809 Page 7 EN 12569:1999 4.3.2 Anti-blowsut shaftlstem The design of the shafstem shall be anti-blow-out type in accordance with EN 736-3. 4.3.3 Gaskets Gaskets of the shell shall be radia
19、lly retained against the pressure, except in the case of body bonnet joints up to and including PN 25 (or Class 150) valves. Spiral wound gaskets sealing the bodykover connection shall be fully retained or provided with outer and inner guide rings. The sealing face of spiral wound gaskets and metall
20、ic ring-joint gaskets shall not be interrupted by bolts, rings etc. 4.3.4 Fugitive emission control .I When required, valves shall be fitted with a stem seal specifically designed to prevent fugitive emissions to the atmosphere. If requested by the purchaser a type qualification test shall be carrie
21、d out. The test procedure and the acceptance criteria shall be as agreed. Where bellows and diaphragms are used as primary seals, they shall be provided with a secondary packing in case of rupture. 4.3.5 Anti-static protection The electrical resistance between body and obturator/stem of the valve sh
22、all not exceed IO6 ohms. 4.3.6 Screwed connections All screwed connections, e.g. bodykover connections or screwed in parts of valves, shall be properly secured (e.g. by friction or locking) against accidental loosening. Screwed bodykover connections that rely on the thread to seal are not acceptable
23、. The valve shall be designed so that the risk of media induced crevice corrosion will be avoided. 4.3.7 Wafer and lug type valves Wafer and lug type valves shall not require an increase in flange bolt load above that which is necessary to seal the valve/flange joints. 4.3.8 Position of the obturato
24、rlactuator in quarter turn valves The position of a lever or indicator shall be in the direction of the pipeline when the valve is open and perpendicular to the pipeline when the valve is closed. Wrong assembly of the lever or indicator shall be impossible. The shaft design and the actuator shall in
25、dicate the same obturator position whatever accessories are used (e.g. extensions). After assembly, the position of actuators and gearboxes relative to the valve shall be physically marked in order to avoid incorrect re-assembly during maintenance. Q BSI 06-2001 Page 8 EN 12569:1999 4.3.9 Shaft or s
26、tem strength 4.3.9.1 o When specified by the purchaser the valve manufacturer shall supply information on: a) the required torque (or the necessary force) to open and to close the valve; b) the maximum allowable torque or force which may be applied to the stem or the shaft. 4.3.9.2 The weakest point
27、 of the shaft shall always be outside the pressure retaining shell. 4.3.10 End of line service .I When valves are specified for end of line isolation service they shall be capable of sealing the allowable pressure in both directions. 4.3.11 Connection to the drive .I When the purchaser requires an a
28、ctuator attachment that is integral with the valve, it shall be in accordance with EN IS0 5210 or prEN 121 16:1996. The connection between the valve body and the gearbox or actuator shall be vented such that any product leakage from the stem or shaft cannot penetrate into the gearbox or actuator hou
29、sing. 4.4 Materials 4.4.1 Principal requirements Ferrous materials shall be chosen from prEN 1503-1 : 1995, prEN 1503-2:1995 and prEN 1503-3:1995, and EN 1563. Spheroidal graphite cast iron in accordance with EN 1563 should be limited to qualities with an elongation equal to or greater than 18 %. In
30、 the case of non-ferrous materials or steels where these standards are not appropriate, the materials shall be subject to agreement between the manufacturer and the purchaser. .I If other materials are needed, the materials shall be specified by the purchaser. 4.4.2 EN-GJS-400-18-Spheroidal graphite
31、 cast iron The formation of the structure in valves made of EN-GJS-400-18 shall contain greater than 90 % spheroidal graphite formation in a largely ferritic matrix with a maximum of 5 % pearlite content. The presence of secondary cementite in the micro-section, which can be verified at 200 times ma
32、gnification, is not permitted. In the case of EN-GJS-400-18, ferritic annealing of the components shall be carried out. The notched-bar impact energy shall be determined at - 20C for each cast batch or heat-treatment batch on a body from the last casting box or, if not possible, on the test specimen
33、 integrally cast with the body. The thickness of the integrally cast test specimen should be less than or equal to the flange thickness. The remaining tests can be carried out in accordance with EN 1563. In the case of small castings in which it is not possible to determine the notched-bar impact en
34、ergy, the manufacturer may verify satisfactory condition of the material by means of a metallographic micro-section. In this case the micro-graph shall be supplied. O BSI 06-2001 Page 9 EN 12569:1999 4.4.3 High alloyed materials Austenitic stainless steel shall be supplied in a solution annealed and
35、 water quenched condition. Where highly corrosion-resistant materials are specified, (e.g. nickel and nickel base alloys, titanium, tantalum), the manufacturer shall provide fabrication documents on chemical analysis, mechanical properties and material finish. o Specific requirements, e.g. concernin
36、g material certification shall be indicated by the purchaser. 4.4.4 Impact testing o If an impact test, additional to any required by the material specification, is necessary for low temperature applications, it shall be specified by the purchaser. 4.4.5 Painting, coating, lining and liners Painting
37、, coating and lining shall be conducted in accordance with a written procedure defining requirements for raw materials, surface preparation, application, bonding and control of quality including thickness, porosity etc. as applicable. Liners shall be produced in accordance with a written procedure t
38、hat defines the material used, the production process, acceptable quality and testing. Painting, coating, lining and liners shall be of the required quality in accordance with the applicable procedure and be free of unacceptable defects. 4.4.6 Traceability o When requested by the purchaser, traceabi
39、lity for all materials for shell components shall be maintained throughout manufacture, including assembly and test. Bolting shall be marked with strength-class or material code and manufacturer logo. 4.5 Welding to parts of valves 4.5.1 General All welding shall be performed in accordance with a wr
40、itten welding procedure. Butt welds shall be full penetration type. If the carbon content is greater than 0,20 % and the carbon equivalent is greater than 0,35 % the welding procedure shall define preheat temperature, interpass temperature and postweld heat treatment. Carbon steels and ferritic allo
41、y steels shall have carbon content limited to 0,25 % and carbon equivalent limited to 0,45 % unless otherwise agreed between manufacture and purchaser. Mn Cr+Mo+V Cu+Ni 6 5 15 Carbon equivalent = C + - + + The following stipulations apply to welding of castings: a) repair by welding to mechanically
42、damaged (e.9. destroyed or deformed by application of force) cast steel parts is not permitted; b) welding to grey cast iron and spheroidal graphite cast iron is not permitted. O BSI 06-2001 STD.BS1 BS EN L25b7-ENGL 1777 m 1b24bb7 0712b02 123 m Page 10 EN 12569: 1999 After welding, parts made of aus
43、tenitic stainless steel shall be subjected to a surface treatment so that the parts are clean and free from rust, scale and heating dis-colouration. 4.5.2 Welder and welding procedure qualification Welder and welding procedure qualification shall be carried out in accordance with EN 287-1 and EN 288
44、-1. 4.5.3 Repair of castings and of fabrication welds Repair welding is permissible on steel castings only and on fabrication welds. All finished repairs shall be examined after heat treatment to the required severity level given in table 1. Level I Undocumented repairs performed before heat treatme
45、nt are permissible when they do not exceed 40 Yo of wall thickness. Undocumented repairs performed after heat treatment are permissible when they do not exceed 20 % of wall thickness or 25 mm whichever is smaller. Other repairs shall be in accordance with the requirements for level II. o Level II Re
46、pairs shall be performed in accordance with a written procedure specifying the requirements for defect removal, welding, heat treatment and non-destructive examination. Repair excavations shall be examined by liquid penetrant to ensure complete removal of the defect. The complete repair operation sh
47、all be fully documented. 4.5.4 Heat treatment Post weld heat treatment shall be performed when necessary to achieve the required material properties. 4.5.5 Inspection of pressure retaining welds The following inspection of pressure retaining welds shall be performed: - visual inspection at 1 O0 %; -
48、 for unalloyed or austenitic steel valves greater than DN 100 and for all alloy steel valves, 100 % surface test and 10 % volumetric test of each delivery batch; - for unalloyed or austenitic steel valves up to and including DN 100, and for all alloyed steel valves, a random sample surface test of 1
49、0 Yo of each delivery batch is sufficient. Acceptance criteria should be in accordance with annex A. In the case of fillet welds the volumetric test may be omitted when impractical. For welds which are performed by a fully automatic process and where the process qualification has been performed on a sample of the actual weld, inspection may be 10 % surface instead of 100 % surface test and 1 O YO volumetric test. Tests shall be conducted on at least the first and last sample of each production batch. O BSI 06-2001 STD-BSI BS EN 125b7-ENGL 1777 m 1b2qbb7 07L2b03 Ib
