1、Designation: F 1791 00 (Reapproved 2006)An American National StandardStandard Specification forFilters Used in Air or Nitrogen Systems1This standard is issued under the fixed designation F 1791; the number immediately following the designation indicates the year oforiginal adoption or, in the case o
2、f 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 design, construction, test,and performance requirements for air
3、 or nitrogen system filters,referred to hereinafter as filters. These filters are intended to beinstalled in-line to protect equipment from particular contami-nation.1.2 The values stated in this specification in inch-poundsunits are to be regarded as the standard. The SI equivalentshown in parenthe
4、ses are provided for information only.2. Referenced Documents2.1 ASTM Standards:2F 992 Specification for Valve Label Plates2.2 American Society of Mechanical Engineers (ASME):B1.1 United Screw Threads (UN and UNR Thread Form)3B1.20.1 Pipe Threads, General Purpose (Inch)3B16.11 Forged Steel Fittings,
5、 Socket-Welding andThreaded3B16.25 Buttwelding Ends3B16.34 Flanged, Threaded, and Welded End32.3 Society of Automotive Engineers (SAE):ARP 901 Aerospace Recommended PracticeBubble-Point Test Method42.4 Military Standards and Specifications:MIL-STD-167-1 Mechanical Vibrations of ShipboardEquipment (T
6、ype IEnvironmental and Type IIInternally Excited)5MIL-STD-740-1 Airborne Sound Measurements and Ac-ceptance Criteria of Shipboard Equipment5MS16142 Boss, Gasket Seal Straight Thread Tube Fitting,Standard Dimensions for5MIL-S-901 Shock Tests, H.I. (High-Impact); ShipboardMachinery, Equipment and Syst
7、ems, Requirements for5MIL-F-1183 Fittings, Pipe, Cast Bronze, Silver-Brazing,General Specifications for52.5 Naval SEA Systems Command (NAVSEA): GovernmentDrawings:NAVSEA 803-1385884 Unions, Fittings and Adapters Buttand Socket Welding 6000 PSI, WOG, NPS5NAVSEA 803-1385943 Unions, Silver Brazing 3000
8、 PSI,WOG, NPS, for UT Inspection5NAVSEA 803-1385946 Unions, Bronze Silver Brazing,WOG for UT Inspection53. Terminology3.1 Definitions:3.1.1 absolute contaminant removal ratingthe smallestsize of contaminant as defined in ARP 901 that the filter willretain with 100 % efficiency by weight.3.1.2 bubble
9、 pointthe pressure differential across a sub-merged filter element required to produce a visible and steadystream of air bubbles. Correlation between bubble point andcontaminant removal capability provides an economical meansto test for contaminant removal capability on a productionbasis. The bubble
10、 point indicates the maximum pore size of thefilter media under static conditions.3.1.3 bubble-tightno visible leakage over a 3-min periodusing either water submersion or the application of bubble fluidfor detection.3.1.4 clean filter element pressure dropthe pressure dropacross the filter element w
11、hen it is new or uncontaminated.3.1.5 cleanable filter elementa filter element that, afterbeing contaminated to its dirt-holding capacity (contaminatedfilter element pressure drop), can be restored by cleaning tooperational condition and with a pressure drop not exceedingthe required clean filter el
12、ement pressure drop.3.1.6 contaminant removal ratingthis is a measure of thesize of contaminants that the filter can remove from the flowstream.3.1.7 contaminated filter element pressure dropthe pres-sure drop across the filter element when it is contaminated tothe point where cleaning or replacemen
13、t is required.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 May 1, 2006. Published May 2006. Originallyapproved in 1997. Last previous e
14、dition approved in 2000 as F 1791 00.2For 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 American
15、 Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990.4Available from Society of Automotive Engineers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001.5Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins
16、Ave., Philadelphia, PA 19111-5094, Attn: NPODS.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.8 differential pressure indicator actuation pressurethepressure drop across the filter element at which the differentialpressure indic
17、ator actuates.3.1.9 disposable filter elementa filter element that, afterbeing contaminated to its dirt-holding capacity (contaminatedfilter element pressure drop), cannot be restored to operationalconditions and thereafter should be replaced.3.1.10 external leakageleakage that escapes to atmo-spher
18、e.3.1.11 filter element bypass full-flow differential pressurethe pressure drop across the filter element at which the filterbypass is passing the full-flow rating of the filter.3.1.12 filter element bypass reseat differential pressurethepressure drop across the filter element at which the filter by
19、passreseats after passing the full-flow rating of the filter.3.1.13 filter element bypass set differential pressurethepressure drop across the filter element at which the filter bypassopens.3.1.14 filter element collapse strengththe maximum pres-sure drop or differential across the filter element th
20、at theelement must withstand without collapse, damage, or impair-ment of performance capabilities.3.1.15 filter element contaminant-holding capacityalsocommonly termed “dirt capacity.” The amount of a contami-nant, expressed in weight, that the element can hold when itsresistance to flow causes a pr
21、essure drop equal to the contami-nated filter element pressure drop.3.1.16 filter element pressure dropthe pressure dropacross the filter element.3.1.17 filter housing pressure dropthe pressure drop ac-counted for by the filter housing.3.1.18 filter pressure dropthe pressure drop across theentire fi
22、lter (element and housing) at any given flow rate of theservice fluid (air or nitrogen).3.1.19 flow capacitythe maximum flow rate that the filteris required to pass.3.1.20 hydrostatic shell test pressurethe hydrostatic testpressure that the filter is required to withstand without damage.The filter m
23、ust be capable of meeting all performance require-ments after the shell test pressure has been removed.3.1.21 media migrationany material released into theflow stream by the filter media and its materials of construc-tion. This term refers to the tendency of the filter media or“built-in” contaminati
24、on, such as, welding scale, metal par-ticles, or air-borne dust combined with the media during itsmanufacture, to leave the filter and shed or migrate into theflow stream.3.1.22 nominal contaminant removal ratingthe smallestsize of contaminant as defined in ARP 901 that the filter willretain with 98
25、 % efficiency by weight.3.1.23 operating pressurethe pressure within the filterduring service.3.1.24 pressure ratingsthe pressure rating of the filtershall be defined in the documents listed in Table 1. Thepressure rating for a filter is the maximum allowable working(service) pressure at 100F (38C).
26、4. Classification4.1 Filters shall be of the following types, compositions,styles, pressure ratings, sizes, end connections, and contami-nation removal ratings, as specified in Section 5.4.1.1 Filter Element Type:4.1.1.1 Type 1Disposable.4.1.1.2 Type 2Cleanable.4.1.2 Filter Element Bypass Compositio
27、n:4.1.2.1 Composition A: with bypass.4.1.2.2 Composition B: without bypass.4.1.3 Filter Element Differential Indicator Style:4.1.3.1 Style I: with differential pressure indicator.4.1.3.2 Style II: without differential pressure indicator.4.2 Pressure RatingsFilters shall have pressure ratingsselected
28、 from those listed in Table 1 and specified in Section 5.The pressure rating selected shall be the same for both the filterinlet and outlet.4.3 SizeFilter sizes shall be14 NPS (13.5 mm),12 NPS(21.3 mm),34 NPS (26.9 mm), 1 NPS (33.7 mm), 114 NPS(42.4 mm), 112 NPS (48.3 mm), and 2 NPS (60.3 mm) or ass
29、pecified in Section 5 (see Table 2).4.4 End ConnectionsFilters shall have inlet and outlet endconnections selected from those listed in Table 1 and specifiedin Section 5. Inlet and outlet connections shall be identical.TABLE 1 Filter Inlet and Outlet End ConnectionsType of EndConnectionPressure Rati
30、ngApplicable Documentsfor DimensionalDetails ofEnd ConnectionsButt-welded ASME B16.34 Class 150,300, 400, 600, 900,1500, 2500, or 4500ASME B16.25Socket-welded ASME B16.34 Class 150,300, 400, 600, 900,1500, 2500, or 4500ASME B16.11Threaded (taperedpipe thread)ASME B16.34 Class 150,300, 400, 600, 900,
31、1500, or 2500ASME B1.20.1 andASME B16.11Union-end,Asilver-brazedMIL-F-1183 (O-ring type)400 lb/in.2(2.758 MPa)MIL-F-1183 (O-ringtype) 400 lb/in.2(2.758 MPa)Union-end,Asilver-brazed803-1385946 1500lb/in.2(10.342 MPa)803-1385946 1500lb/in.2(10.342 MPa)Union-end,Asilver-brazed803-1385943 3000lb/in.2(20
32、.684 MPa)803-1385943 3000lb/in.2(20.684 MPa)Union-end,Abutt/socket weld803-1385884 6000lb/in.2(41.369 MPa)803-1385884 6000lb/in.2(41.369 MPa)Other, as specified as specified as specifiedAFor union inlet and outlet connections, only the pertinent dimensions listed inthe applicable documents (military
33、 specification or NAVESA requirements) shallapply. The filter shall be supplied with the thread pieces only, without the tail piecesand union nuts.TABLE 2 Filter Performance CharacteristicsFilter Size, NPSMinimum Dirt-Holding CapacityGrams AC Coarse14 (13.5 mm) 6.012 (21.3 mm) 6.034 (26.9) 10.01 (33
34、.7 mm) 12.0114 (42.4 mm) 12.0112 (48.3 mm) 14.02 (60.3 mm) 16.0As specified as specifiedF 1791 00 (2006)24.5 Contamination Removal RatingsFilters shall havecontamination removal ratings selected from the followingthree categories: 20 m nominal/50 m absolute, 5 mnominal/18 m absolute, and 0.4 m nomin
35、al/5 m absolute.The contamination rating selected shall be specified in Section5.5. Ordering Information5.1 Ordering documentation for filters under the specifica-tion shall include the following information, as required, todescribe the equipment adequately.5.1.1 ASTM designation and year of issue,5
36、.1.2 Title, number, and date of this specification,5.1.3 Filter element type (see 4.1.1),5.1.4 Filter element bypass composition (see 4.1.2),5.1.5 Filter element differential pressure indicator style (see4.1.3),5.1.6 Filter pressure rating (see 4.2),5.1.7 Size (see 4.3),5.1.8 End connections (see 4.
37、4),5.1.9 Contaminant removal rating, absolute/nominal (see4.5),5.1.10 Maximum filter operating pressure,5.1.11 Flow capacity required (see 7.1, S1.3),5.1.12 Supplementary requirements, if any (S1.0 throughS4.0), and5.1.13 Maximum vibration frequency and amplitude, ifother than specified (see S1.8).6
38、. Filter Design and Construction6.1 Filters shall incorporate the design features specified in6.1.1-6.1.6.6.1.1 Materials of ConstructionMaterials shall be 300series corrosion-resistant steel (SS304, 304L, 316, or 316L), orother materials selected to provide compatibility with the linemedium, weldab
39、ility, and corrosion resistance without requir-ing painting, coating, or plating. The filter body and the filterbowl shall be weld repairable. Materials for contacting partsshall be selected to minimize electrolytic corrosion and galling.6.1.2 Design Construction Requirements:6.1.2.1 General Constru
40、ctionThe filter shall have a boltedflanged body and filter bowl to expedite removal of the filterelement for cleaning or replacement.6.1.2.2 Collapse StrengthThe filter element shall be ca-pable of withstanding a differential pressure equal to themaximum inlet pressure rating without structural degr
41、adation.6.1.2.3 Automatic BypassWhen specified (see 5.1.4), thefilter assembly shall incorporate an automatic bypass feature tobypass system fluid automatically around the filter element inthe event of excessive flow restriction through the filterelement. The automatic bypass shall be set in accorda
42、nce withTable 3 and shall have a capacity equal to or greater than thatof a clean filter assembly.6.1.2.4 Filter Element InstallationPositive means shallprevent any play or looseness of the filter element in serviceand prevent cocking or misalignment during installation.6.1.2.5 Filter Element Flow D
43、irectionThe filter elementflow direction shall be from the outside to the inside surface ofthe element.6.1.2.6 CleanabilityCleanable filter elements shall becleanable and reusable by means of scrubbing and washing theoutside surface with detergent and tap water and blowingthrough with compressed air
44、 not exceeding 30-psig (207-kPagage pressure). Once cleaned, the element shall be capable ofmeeting the requirements for a new element. Cleanable filterelements shall not be adversely affected by immersion in waterand shall be capable of meeting the above criteria for not lessthan five cleaning and
45、reuse cycles.6.1.2.7 Differential Pressure IndicatorWhen specified(see 5.1.5), the filter body shall incorporate a nonelectrical,“pop up” differential pressure indicator which senses thepressure drop across the element and actuates in accordancewith Table 3. Once actuated, a red indicator button sha
46、ll remainup until manually reset.6.1.2.8 O-Ring LocationsO-rings in face-seal applicationsshall have the grooves located in the lower members tosimplify assembly.6.1.2.9 Pressure EnvelopeThe hydrostatic shell test pres-sures shall be 1.5 times the filter rated pressure at 100F(38C).6.1.2.10 Connecti
47、onsThe inlet and outlet end connectionsof the filter shall be as specified in Table 1. Any exposedthreads shall be protected by plastic caps for shipping.6.1.2.11 Port ConfigurationThe filter body shall havein-line inlet and outlet end connections for installation into thepiping system.6.1.2.12 Pres
48、sure LinesAll pressure lines in the filter shallbe internally ported.6.1.2.13 AccessibilityThe filter shall be fully and easilyaccessible for cleaning or repair without removal of the filterbody from the line.6.1.2.14 ThreadsThreads shall be as specified in ASMEB1.1. Where necessary, provisions shal
49、l be incorporated toprevent the accidental loosening of threaded parts. The designshall be such that standard wrenches can be used on all externalbolting. Lock-wire shall not be used.6.1.2.15 InterchangeabilityThe entire filter, including allassociated piece parts, shall have part number identity and shallbe replaceable from stock or the manufacturer on a nonselec-tive and random basis. Parts having the same manufacturersTABLE 3 Filter Pressure Drop RequirementsNOTE 1Percentages shown above shall read as percent o
