ASTM F1020-1986(2006) Standard Specification for Line-Blind Valves for Marine Applications《船用暗线阀》.pdf

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1、Designation: F 1020 86 (Reapproved 2006)An American National StandardStandard Specification forLine-Blind Valves for Marine Applications1This standard is issued under the fixed designation F 1020; the number immediately following the designation indicates the year oforiginal adoption or, in the case

2、 of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification provides the minimum requirementsfor design fabrication, pressure rating

3、, and testing for line-blindvalves.1.2 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.1.3 The following safety hazards caveat pertains only to thetest methods portion, Section 5, of this specification: Thisstandard doe

4、s not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standa

5、rds:2A 53/A 53M Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless2.2 ANSI Standards:B16.5 Pipe Flanges and Flanged Fittings, Steel-Nickel Al-loy and Other Special Alloys3B31.1 Power Piping32.3 MSS Standards:SP-6 Finish for Contact Faces of Pipe Flanges and Connect

6、-ing End Flanges of Valves and Fittings4SP-25 Marking System for Valves, Fittings, Flanges, andUnions4SP-55 Quality Standard for Steel Castings for Valves,Flanges and Fittings, and Other Piping Components (Vi-sual Method)42.4 ASME Standard:ASME Boiler and Pressure Vessel Code, Sections II, VIII,IX53

7、. Descriptions of Terms Specific to This Standard3.1 blanka solid one-piece circular unit inserted into apipeline to prevent flow.3.2 line-blind valvean assembly consisting of a spectacleplate, bolting, and body, the purpose of which is to provide aconvenient means to align a piping system to an ope

8、n orpositively closed configuration. The assembly is designed toprovide a simplified method of changing over the flow controlspectacle plate without the necessity of plate removal from thevalve body.3.3 spectacle plate, (also spectacle blind )a figure-eight-shaped unit with one end open for flow and

9、 the other solid toprevent flow.4. Materials and Manufacture4.1 Materials:4.1.1 Materials for spectacle plates, bolting, and body shallbe those contained in ASME Section II. For the purpose ofstress calculations, ASME Section VIII values shall be used.4.1.2 All welding shall be done with procedures

10、and weldersqualified in accordance withASME Section IX and 80 % weldefficiency factor shall be used.4.1.3 All castings shall be visually inspected and acceptablein accordance with MSS-SP-55.4.2 Manufacture:4.2.1 The spectacle plate shall be designed in accordancewith ANSI B31.1, Paragraph 104.5.3.4.

11、2.2 The calculations of 4.2.3 and 4.2.4 shall ensure that aline blind is designed for the gasket material, of all that can beused with the line blind being designed, that imposes the mostcritical bolt-load conditions as a result of its gasket factor, m,and gasket or joint-contact-surface unit seatin

12、g load, y.4.2.3 The bolting shall be either of the following:4.2.3.1 Modify the external loads in accordance with Sec-tion 6 as determined using ASME Section VIII, Division 1,Appendix 2.4.2.3.2 The equivalent in cross section to that of ANSIB16.5 flange bolting of equivalent nominal size and pressur

13、e.1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.11 onMachinery and Piping Systems.Current edition approved Feb. 1, 2006. Published February 2006. Originallyapproved in 1986. Last previous edition

14、 approved in 2001 as F 1020 86 (2001).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from America

15、n National Standards Institute, 25 W. 43rd St., 4thFloor, New York, NY 10036.4Available from Manufacturers Standardization Society of theValve and FittingsIndustry (MSS), 127 Park St., NE, Vienna, VA 22180-4602.5Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headqu

16、arters, Three Park Ave., New York, NY 10016-5990.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2.3.3 In no case shall bolts have a nominal diameter lessthan in. (12.7 mm).4.2.3.4 The material class shall be an approvedANSI B16.5m

17、aterial or equal in tensile strength.4.2.3.5 Cast bolting shall be X-rayed or have an 80 %efficiency factor applied.4.2.4 The body shall be calculated using ASME SectionVIII, Division 1, Appendix 2 with consideration for the sizeand material of bolting in the appendix, the bolt load satisfyingNote 2

18、 of Paragraph 2-5 of Appendix 2.4.2.5 The spectacle plate and mating body facings shall bein accordance with MSS-SP-6.5. Testing5.1 Each valve body shall be hydrostatically tested to theshell test pressure in accordance with ANSI B16.5, Table 3. Avalve supplied to the WOG standard shall be tested up

19、 to thenearest ANSI Class.5.2 Each valve shall be tested for leakage at pressure 1.5times the cold water rating of the valve rounded upward to thenext higher 25-psi (170-kPa) increment. Acceptance criteriashall be that no leakage occurs during a 10-min “hold time” atpressure.6. Calculations6.1 Bolti

20、ng calculations from ASME Section VIII, Division1, Appendix 2 shall be modified to account for an externallyapplied load as a result of piping.Add to the minimum requiredbolt load for the operating conditions, Wm1, an externalmoment bolt load, Hx, such that the modified total cross-sectional area of

21、 the bolts shall be as follows:A8m15 Wm11 Hx!/Sbwhere:Hx= SZ/db,Z = P(Do4 Di4)/Do)/32,Di= Do2tp,tp= PDo/(2(0.875)(S), but not less than 0.25 in. (6.4mm), anddb= C/P + 2(Go3 Gi3)/(Go2 Gi2)3P.6.1.1 All terms are identical to those defined in ASMESection VIII, Appendix 2 with the addition of the follow

22、ing:6.1.1.1 A8m1= modified total cross-sectional area of bolts atroot of thread or section of least diameter under stress, requiredfor the operating conditions, square inch (square millimetre).6.1.1.2 Hx= external moment of bolt load, lbf (N).6.1.1.3 0.875 = assumed pipe wall tolerance factor.6.1.1.

23、4 S = ASME allowable stress of the pipe material atdesign temperature, psi (kPa) (for purposes of meeting thisspecification, 15 000 psi (103.4 MPa) from SpecificationA 53/A 53M, Grade B, Type S shall be acceptable).6.1.1.5 Z = section modulus of pipe shell, cubic inches(cubic millimetres).6.1.1.6 Do

24、= nominal outside diameter of pipe, inches(millimetres).6.1.1.7 Di= calculated inside diameter of pipe, inches(millimetres).6.1.1.8 tp= calculated pipe wall thickness, inches (millime-tres).6.1.1.9 db= moment arm of external moment on bolts andgasket, inches (millimetres).6.1.1.10 Go= outside diamet

25、er of contact surface of gasket,inches (millimetres).6.1.1.11 Gi= inside diameter of contact surface of gasket,inches (millimetres).6.2 The selection of bolts to be used shall be made such thatthe actual total cross-sectional area of bolts, Ab, will not be lessthan Am, where Amis taken as the greate

26、r of A8m1and Am2.7. Product Marking7.1 Each valve must have the following markings in accor-dance with MSS-SP-25:7.1.1 Manufacturers name and trademark.7.1.2 Appropriate pressure class.7.1.3 Size of end connection.7.1.4 ASTM designation of materials.7.1.5 ASTM designation and year of issue of this s

27、pecifi-cation.8. Keywords8.1 blind valve; line-blind valve; marine technology; pipingsystem; ship; valveASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that

28、determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapprove

29、d or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel

30、 that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).F 1020 86 (2006)2