1、Designation: F1791 00 (Reapproved 2013) An American National StandardStandard Specification forFilters Used in Air or Nitrogen Systems1This standard is issued under the fixed designation F1791; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、 revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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 o
3、r 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 parenthese
4、s are provided for information only.2. Referenced Documents2.1 ASTM Standards:2F992 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, So
5、cket-Welding andThreaded3B16.25 Buttwelding Ends3B16.34 Flanged, Threaded, and Welded End32.3 Society of Automotive Engineers (SAE):ARP 901 Aerospace Recommended PracticeBubble-PointTest Method42.4 Military Standards and Specifications:MIL-STD-167-1 Mechanical Vibrations of ShipboardEquipment (Type
6、IEnvironmental and Type IIInternally Excited)5MIL-STD-740-1 Airborne Sound Measurements and Accep-tance 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 Systems,
7、 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 PSI
8、,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 poi
9、ntthe 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 poi
10、nt 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 when
11、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 elemen
12、t 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 drop the pres-sure drop across the filter element when it is contaminated tothe point where cleaning or replacement i
13、s 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, 2013. Published May 2013. Originallyapproved in 1997. Last previous edit
14、ion approved in 2006 as F1791 00 (2006).DOI: 10.1520/F1791-00R13.2For 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 webs
15、ite.3Available from American 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, Bl
16、dg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.8 differential pressure indicator actuation pressurethepressure drop across the filter element at which the
17、 differentialpressure indicator 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
18、 that escapes to atmo-sphere.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 ele
19、ment at which the filter bypassreseats 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 a
20、cross the filter element that 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 acontaminant, expressed in weight, that the element can holdwhen its resis
21、tance to flow causes a pressure drop equal to thecontaminated 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 d
22、rop across theentire filter (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 with
23、out damage.The filter must be capable of meeting all performance require-ments after the shell test pressure has been removed.3.1.21 media migrationany material released into the flowstream by the filter media and its materials of construction.This term refers to the tendency of the filter media or
24、“built-in”contamination, such as, welding scale, metal particles, orair-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
25、 willretain with 98 % 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) pres
26、sure at 100F (38C).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 Elemen
27、t Bypass Composition: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 Ratings Filters shall have pres
28、sure ratingsselected 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
29、NPS (60.3 mm) or asspecified in Section 5 (see Table 2).4.4 End Connections Filters shall have inlet and outletend connections selected from those listed in Table 1 andspecified in Section 5. Inlet and outlet connections shall beidentical.4.5 Contamination Removal Ratings Filters shall havecontamina
30、tion removal ratings selected from the followingthree categories: 20 m nominal/50 m absolute, 5 mnominal/18 m absolute, and 0.4 m nominal/5 m absolute.The contamination rating selected shall be specified in Section5.TABLE 1 Filter Inlet and Outlet End ConnectionsType of End Connection Pressure Ratin
31、gApplicable 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, 900,1
32、500, 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.
33、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 in theapplicable documents (military
34、specification or NAVESArequirements) shall apply.The filter shall be supplied with the thread pieces only, without the tail pieces andunion nuts.F1791 00 (2013)25. Ordering Information5.1 Ordering documentation for filters under the specifica-tion shall include the following information, as required
35、, todescribe the equipment adequately.5.1.1 ASTM designation and year of issue,5.1.2 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 Fil
36、ter pressure rating (see 4.2),5.1.7 Size (see 4.3),5.1.8 End connections (see 4.4),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), and5.1.1
37、3 Maximum vibration frequency and amplitude, ifother than specified (see S1.8).6. 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),
38、 orother materials selected to provide compatibility with the linemedium, weldability, 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 corr
39、osion and galling.6.1.2 Design Construction Requirements :6.1.2.1 General ConstructionThe 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 differ
40、ential pressure equal to themaximum inlet pressure rating without structural degradation.6.1.2.3 Automatic Bypass When 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 r
41、estriction through the filterelement. The automatic bypass shall be set in accordance withTable 3 and shall have a capacity equal to or greater than thatof a clean filter assembly.6.1.2.4 Filter Element Installation Positive means shallprevent any play or looseness of the filter element in servicean
42、d prevent cocking or misalignment during installation.6.1.2.5 Filter Element Flow Direction The filter elementflow direction shall be from the outside to the inside surface ofthe element.6.1.2.6 Cleanability Cleanable filter elements shall becleanable and reusable by means of scrubbing and washing t
43、heoutside surface with detergent and tap water and blowingthrough with compressed air 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 watera
44、nd shall be capable of meeting the above criteria for not lessthan five cleaning and reuse cycles.6.1.2.7 Differential Pressure Indicator When specified(see 5.1.5), the filter body shall incorporate a nonelectrical,“pop up” differential pressure indicator which senses thepressure drop across the ele
45、ment and actuates in accordancewith Table 3. Once actuated, a red indicator button shall remainup until manually reset.6.1.2.8 O-Ring Locations O-rings in face-seal applica-tions shall have the grooves located in the lower members tosimplify assembly.6.1.2.9 Pressure EnvelopeThe hydrostatic shell te
46、st pres-sures shall be 1.5 times the filter rated pressure at 100F(38C).6.1.2.10 Connections The 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-
47、line inlet and outlet end connections for installation into thepiping system.6.1.2.12 Pressure Lines All pressure lines in the filtershall be internally ported.6.1.2.13 Accessibility The filter shall be fully and easilyaccessible for cleaning or repair without removal of the filterbody from the line
48、.6.1.2.14 ThreadsThreads shall be as specified in ASMEB1.1. Where necessary, provisions shall be incorporated toTABLE 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 (33.7 mm) 12.0114 (42.4 mm) 12.0112 (4
49、8.3 mm) 14.02 (60.3 mm) 16.0As specified as specifiedTABLE 3 Filter Pressure Drop RequirementsNOTE 1Percentages shown above shall read as percent of theoperating pressure of the filter (see 3.1.23 and 5.1.10).Filter Pressure DropMaximumAllowableClean Ele-ment (see7.1.5) P Indica-torActuation(see 7.1.5)MaximumAllowableContami-nated Ele-ment (see7.1.5)Filter Element Bypass (see S1.0)Set Full Flow Reseat2.5 % 4.75 to5.25 %6.25 % 7.25 to8%8.25 to9.25 %6.25 to7%Example:Operating pressure: 1000 psi (6895 kPa)Maximum all
