1、Designation: F 1792 97 (Reapproved 2004)An American National StandardStandard Specification forSpecial Requirements for Valves Used in Gaseous OxygenService1This standard is issued under the fixed designation F 1792; the number immediately following the designation indicates the year oforiginal adop
2、tion or, in the case 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 covers the special requirements forvalves used in ga
3、seous oxygen service. It is intended that thisspecification be invoked as an additional requirement inconjunction with primary valve specifications.1.2 The values stated in this specification in inch-poundunits are to be regarded as the standard. The SI equivalentshown in parenthesis are provided fo
4、r information only.2. Referenced Documents2.1 ASTM Standards:2G 63 Guide for Evaluating Nonmetallic Materials for Oxy-gen ServiceG 88 Guide for Designing Systems for Oxygen ServiceG 93 Practice for Cleaning Methods and Cleanliness Levelsfor Material and Equipment Used in Oxygen-EnrichedEnvironmentsG
5、 94 Guide for Evaluating Metals for Oxygen Service2.2 American National Standards Institute (ANSI):3B1.1 Unified Screw Threads2.3 American Society of Mechanical Engineers (ASME):4Boiler and Pressure Vessel Code2.4 Military Standards and Specifications:5MIL-STD-1330 Standard Practice for Precision Cl
6、eaningand Testing of Shipboard Oxygen, Helium, Helium-Oxygen, Nitrogen, and Hydrogen SystemsMIL-V-5027 Valves, Check, Oxygen, High PressureMIL-STD-278 Fabrication, Welding and Inspection; Cast-ing Inspection and Repair for Machinery, Piping andProcess Vessels in Ships of the United States NavyMIL-ST
7、D-271 Non-destructive Testing Requirements forMetalsMIL-P-46122 Plastic Molding and Extrusion Material,Polyvinylidene Fluoride Polymer and Copolymer3. Ordering Information3.1 Ordering documentation for valves under this specifica-tion shall include the following information, as required, todescribe
8、the equipment adequately.3.1.1 ASTM designation and year of issue.3.1.2 Primary valve specification (see 1.1).3.1.3 End preparations, if different than specified in 4.4.3.1.4 Supplementary requirements, if any (see S1 throughS4).4. Valve Design and Construction4.1 Valves shall incorporate the featur
9、es specified in 4.2-4.6.4.2 Materials of ConstructionMaterial requirements shallbe as follows:4.2.1 The pressure containing/retaining envelope (includingany bolting, union nuts, or other fastening devices establishingthe integrity of the pressure containing/retaining envelope),bellows (where applica
10、ble), and end nipples, shall be nickel-copper (70-30). Internal trim which is in contact with the linemedia shall be nickel-copper (70-30), bronze, nickel-aluminum-bronze, Inconel Alloy 600, brass, or other materialswhich are compatible with oxygen service.4.2.2 Non-metallic seat, seat insert, or se
11、als. These materialsshall be selected from TFE, Reinforced TFE, CTFE, plastic inaccordance with MIL-P-46122, Polyamide (Vespel), or PEEK.The materials for O-rings and gaskets shall be compatible foroxygen service.4.2.3 LubricantsMaterials for lubricants shall be halocar-bon (25-5S), Dupont (Krytox 2
12、40 AC, 240 AZ), Braycote 601,or other lubricants compatible with oxygen service.4.2.4 Guidance on the selection of materials for oxygenservice can be found in Guides G 63 and G 94. Guidance ondesigning systems for oxygen service can be found in GuideG 88.1This specification is under the jurisdiction
13、 of ASTM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.11 onMachinery and Piping Systems.Current edition approved May 1, 2004. Published May 2004. Originallyapproved in 1997. Last previous edition approved in 1997 as F 1792 - 97.2For referenced ASTM
14、 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 American National Standards Institute (ANSI), 25 W. 43rd St.,4th
15、Floor, New York, NY 10036.4Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990.5Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.1Copy
16、right ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.3 General Requirements:4.3.1 Fire PreventionValves shall be constructed to mini-mize the possibility of initiating ignition in gaseous oxygenservice. This shall be accomplished by the foll
17、owing:4.3.1.1 Materials for parts in contact with oxygen shall havethe highest spontaneous ignition temperatures and the lowestimpact sensitivities compatible with construction and perfor-mance limitations.4.3.1.2 Surfaces in contact with oxygen shall be smoothwith well-rounded edges and without sha
18、rp or thin sectionedprotrusions (that is, all parts shall have a high ratio ofvolume-to-surface area). Sharp exterior corners are prohibited,and interior corners shall have fillets to prevent the retention orentrapment of machining chips, burrs, or foreign material.4.3.1.3 Nonmetallic materials (O-r
19、ings, gaskets, etc.) otherthan the seating insert, if applicable, shall be well removedfrom the main flow path.4.3.2 Fire ContainmentValves shall be constructed tominimize oxygen escape in the event of an internal or externalfire. This shall be accomplished by the following:4.3.2.1 Pressure-Boundary
20、 SealingJoints for thepressure-boundary seals shall provide an effective barrier toleakage in the event of damage or consumption of thenon-metallic sealing elements by providing long, close fittingmetal-to-metal leakage or flame paths.4.3.2.2 Internal SeatingThe seat design shall be such thatin the
21、event that the non-metallic seat is damaged, destroyed, orcarried away, there will be a secondary metal-to-metal seat tominimize through seat leakage. The construction and locationof the nonmetallic seals and seating inserts shall minimize thepossibility of ignition under a pressure surge.4.3.2.3 Pr
22、essure SurgeValves shall be designed to preventpressure surge, which could cause auto-ignition.4.4 Design Features:4.4.1 Manual valves shall be of the packless design, with thestem sealed by a bellows.4.4.2 ThreadsThreads shall conform to ANSI B1.1. Useof threads in contact with oxygen shall be mini
23、mized. Anythreads wetted by oxygen shall be of rolled construction orshall be completely chamfered and deburred to prevent thepossibility of sharp edges or machining burrs in contact withoxygen.4.4.3 CleaningPrior to assembly and testing, valves shallbe degreased and cleaned in accordance with Pract
24、ice G 93,and thereafter maintained clean for oxygen service.4.5 End PreparationUnless otherwise specified (see Sec-tion 3), end preparation for the valves shall be as follows:4.5.1 Valves shall be supplied with inline extension nippleswelded directly to the valve body or fabricated as an integralpar
25、t of the valve body. Nipples shall be of the same basicmaterial as the body. The length and schedule of these nipplesshall be as specified in Table 1.4.6 Welding and Nondestructive TestingWelding and non-destructive testing shall be in accordance with ASME Boilerand Pressure Vessel Code, Sections VI
26、II and IX.5. Marking5.1 Identification PlatesA metallic corrosion-resistingidentification plate shall be securely attached to the valve andshall indicate “Valve specially made for oxygen service”.5.2 In addition, each valve shall be marked in accordancewith their applicable primary valve specificati
27、on requirements.6. Quality Assurance System6.1 The manufacturer shall establish and maintain a qualityassurance system that will ensure all the requirements of thisspecification are satisfied.6.2 A written description of the quality assurance system themanufacturer will use shall be available for re
28、view andacceptance by the inspection authority.6.3 The purchaser reserves the right to witness any tests andinspect the valves in the manufacturers plant to the extentspecified on the purchase order.SUPPLEMENTARY REQUIREMENTSOne or more of the following supplementary requirements S1, S2, S3, or S4 s
29、hall be applied onlywhen specified by the purchaser in the inquiry, contract, or order. Details of those supplementaryrequirements shall be agreed upon in writing by the manufacturer and purchaser. Supplementaryrequirements shall in no way negate any requirement of the specification itself.S1. Suppl
30、emental TestsS1.1 Supplemental tests shall be conducted at a laboratorysatisfactory to the customer and shall consist of the examina-tions and tests selected from those specified in S1.2 throughS1.4.S1.2 Examination Prior to TestingThe valve(s) shall beexamined visually to determine conformance with
31、 the orderingdata, dimensions, and workmanship without disassembly.S1.3 Nonmetallic Materials Compatibility TestMaterialsshall be subjected to the ozone-resistance and oxygen-bombtests as specified in MIL-V-5027, with test pressure applicableto the valve under test. No charring or deterioration is a
32、llowed.S1.4 Nondestructive TestingNondestructive testing shallbe in accordance with MIL-STD-271.TABLE 1 Length and Schedule of Extension NipplesSize of Valve Pipe ScheduleMinimum Lengthof Extension,inches (ValveCenter to End)14 NPS to 1 NPS (13.5 mm to 33.7 mm) 80 7.00 (178 mm)1-12 NPS to 2-12 NPS (
33、48.3 mm to 73.0 mm) 160 12.0 (305 mm)F 1792 97 (2004)2S2. Cleaning, Drying, Packaging, and MarkingRequirementsS2.1 Valves shall be cleaned, dried, packaged, and markedin accordance with MIL-STD-1330. Packaging operationsshall be accomplished in an area that will prevent valvecontamination by hydroca
34、rbons.S3. Quality AssuranceS3.1 Scope of WorkThe written description of the qualityassurance system shall include the scope and locations of thework to which the system is applicable.S3.2 Authority and ResponsibilityThe authority and re-sponsibility of those in charge of the quality assurance system
35、shall be clearly established.S3.3 OrganizationAn organizational chart showing therelationship between management and the engineering, pur-chasing, manufacturing, construction, inspection, and qualitycontrol groups is required. The purpose of this chart is toidentify and associate the various organiz
36、ational groups withthe particular functions for which they are responsible. Theserequirements are not intended to encroach on the manufactur-ers right to establish, and from time to time to alter, whateverform of organization the manufacturer considers appropriatefor its work. Persons performing qua
37、lity control functions shallhave a sufficiently well-defined responsibility and the authorityand the organizational freedom to identify quality controlproblems and to initiate, recommend, and provide solutions.S3.4 Review of Quality Assurance SystemThe manufac-turer shall ensure and demonstrate the
38、continuous effectivenessof the quality assurance system.S3.5 Drawings, Design Calculations, and SpecificationControlThe manufacturers quality assurance system shallinclude provisions to ensure that the latest applicable drawings,design calculations, specifications, and instructions, includingall aut
39、horized changes, are used for manufacture, examination,inspection, and testing.S3.6 Purchase ControlThe manufacturer shall ensure thatall purchased material and services conform to specifiedrequirements and that all purchase orders give full details of thematerial and services ordered.S3.7 Material
40、ControlThe manufacturer shall include asystem for material control that ensures the material received isproperly identified and that any required documentation ispresent, identified to the material, and verifies compliance tothe specified requirements. The material control system shallensure that on
41、ly the intended material is used in manufacture.The manufacturer shall maintain control of material during themanufacturing process by a system that identified inspectionstatus of material throughout all stages of manufacture.S3.8 Manufacturing ControlThe manufacturer shall en-sure that manufacturin
42、g operations are carried out undercontrolled conditions utilizing documented work instructions.The manufacturer shall provide for inspection, where appro-priate, for each operation that affects quality or shall arrange anappropriate monitoring operation.S3.9 Quality Control PlanThe manufacturers qua
43、litycontrol plan shall describe the fabrication operations, includingexaminations and inspections.S3.10 WeldingThe quality control system shall includeprovisions for ensuring that welding conforms to specifiedrequirements. Welders shall be qualified to the appropriatestandards and the qualification
44、records shall be made availableto the inspection authority if required.S3.11 Nondestructive ExaminationProvisions shall bemade to utilize non-destructive examination, as necessary, toensure that material and components comply with the specifiedrequirements. Non-destructive examinations shall be auth
45、o-rized by their employer and/or qualified by a recognizednational body, and their authorizations/qualification recordsshall be made available to the inspection authority if required.S3.12 Non-Conforming ItemsThe manufacturer shall es-tablish procedures for controlling items not in conformancewith t
46、he specified requirements.S3.13 Heat TreatmentThe manufacturer shall providecontrols to ensure that all required heat treatments have beenapplied. Means should be provided by which heat treatmentrequirements can be verified.S3.14 Inspection StatusThe manufacturer shall maintain asystem for identifyi
47、ng the inspection status of material duringall stages of manufacture and shall be able to distinguishbetween inspected and non-inspected material.S3.15 Calibration of Measurement and Test EquipmentThe manufacturer shall provide, control, calibrate, and main-tain inspection, measuring and test equipm
48、ent to be used inverifying conformance to the specified requirements. Suchcalibration shall be traceable to a national standard andcalibration records shall be maintained.S3.16 Records MaintenanceThe manufacturer shall havea system for the maintenance of inspection records, radio-graphs, and manufac
49、turers data reports that describe theachievement of the required quality and the effective operationof the quality system.S3.17 Sample FormsThe forms used in the quality controlsystem and any detailed procedures for their use shall beavailable for review. The written description of the qualityassurance system shall make reference to these forms.S3.18 Inspection AuthorityThe manufacturer shall makeavailable to the inspection authority at the manufacturers planta current copy of the written description of the qualityassurance system. The manufact
