ASTM F1791-00
(Specification)Standard Specification for Filters Used in Air or Nitrogen Systems
Standard Specification for Filters Used in Air or Nitrogen Systems
SCOPE
1.1 This specification covers the design, construction, test and performance requirements for air or nitrogen system filters, referred to hereinafter as filters. These filters are intended to be installed in-line to protect equipment from particulate contamination.
1.2 The values stated in this specification in inch-pounds units are to be regarded as the standard. The SI equivalent shown in parentheses are provided for information only.
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An American National Standard
Designation: F 1791 – 00
Standard Specification for
Filters Used in Air or Nitrogen Systems
This standard is issued under the fixed designation F 1791; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope Standard Dimensions for
MIL-S-901 Shock Tests, H.I. (High-Impact); Shipboard
1.1 This specification covers the design, construction, test,
Machinery, Equipment and Systems, Requirements for
andperformancerequirementsforairornitrogensystemfilters,
MIL-F-1183 Fittings, Pipe, Cast Bronze, Silver-Brazing,
referred to hereinafter as filters. These filters are intended to be
General Specifications for
installed in-line to protect equipment from particular contami-
2.5 Naval SEA Systems Command (NAVSEA): Government
nation.
Drawings:
1.2 The values stated in this specification in inch-pounds
NAVSEA 803-1385884 Unions, Fittings and Adapters Butt
units are to be regarded as the standard. The SI equivalent
and Socket Welding 6000 PSI, WOG, NPS
shown in parentheses are provided for information only.
NAVSEA 803-1385943 Unions, Silver Brazing 3000 PSI,
2. Referenced Documents
WOG, NPS, for UT Inspection
NAVSEA 803-1385946 Unions, Bronze Silver Brazing,
2.1 ASTM Standards:
WOG for UT Inspection
F 992 Specification for Valve Label Plates
2.2 American Society of Mechanical Engineers (ASME):
3. Terminology
B1.1 United Screw Threads (UN and UNR Thread Form)
3.1 Definitions:
B1.20.1 Pipe Threads, General Purpose (Inch)
3.1.1 absolute contaminant removal rating—the smallest
B16.11 Forged Steel Fittings, Socket-Welding and
size of contaminant as defined in ARP 901 that the filter will
Threaded
retain with 100 % efficiency by weight.
B16.25 Buttwelding Ends
3.1.2 bubble point—the pressure differential across a sub-
B16.34 Flanged, Threaded, and Welded End
merged filter element required to produce a visible and steady
2.3 Society of Automotive Engineers (SAE):
stream of air bubbles. Correlation between bubble point and
ARP 901 Aerospace Recommended Practice—Bubble-
contaminant removal capability provides an economical means
Point Test Method
to test for contaminant removal capability on a production
2.4 Military Standards and Specifications:
basis.The bubble point indicates the maximum pore size of the
MIL-STD-167-1 Mechanical Vibrations of Shipboard
filter media under static conditions.
Equipment (Type I—Environmental and Type II—
3.1.3 bubble-tight—no visible leakage over a 3-min period
Internally Excited)
usingeitherwatersubmersionortheapplicationofbubblefluid
MIL-STD-740-1 Airborne Sound Measurements and Ac-
for detection.
ceptance Criteria of Shipboard Equipment
3.1.4 clean filter element pressure drop—the pressure drop
MS16142 Boss, Gasket Seal Straight Thread Tube Fitting,
across the filter element when it is new or uncontaminated.
3.1.5 cleanable filter element—a filter element that, after
being contaminated to its dirt-holding capacity (contaminated
This specification is under the jurisdiction of ASTM Committee F25 on Ships
filter element pressure drop), can be restored by cleaning to
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
operational condition and with a pressure drop not exceeding
Machinery and Piping Systems.
Current edition approved May 10, 2000. Published August 2000. Originally the required clean filter element pressure drop.
published as F 1791 - 97. Last previous edition F 1791 - 97.
3.1.6 contaminant removal rating—this is a measure of the
Annual Book of ASTM Standards, Vol 01.07.
size of contaminants that the filter can remove from the flow
Available from American Society of Mechanical Engineers, Headquarters,
stream.
Three Park Ave., New York, NY 10016–5990. (Telephone: 212–591–7722, Fax:
212–591–7676, Telex: 710–591–5267.
3.1.7 contaminated filter element pressure drop—the pres-
Available from Society of Automotive Engineers, 400 Commonwealth Dr.,
sure drop across the filter element when it is contaminated to
Warrendale, PA 15096.
the point where cleaning or replacement is required.
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F1791–00
TABLE 1 Filter Inlet and Outlet End Connections
3.1.8 differential pressure indicator actuation pressure—the
pressure drop across the filter element at which the differential Applicable Documents
Type of End for Dimensional
pressure indicator actuates.
Pressure Rating
Connection Details of
3.1.9 disposable filter element—a filter element that, after End Connections
being contaminated to its dirt-holding capacity (contaminated
Butt-welded ASME B16.34 Class 150, ASME B16.25
300, 400, 600, 900,
filter element pressure drop), cannot be restored to operational
1500, 2500, or 4500
conditions and thereafter should be replaced.
Socket-welded ASME B16.34 Class 150, ASME B16.11
300, 400, 600, 900,
3.1.10 external leakage—leakage that escapes to atmo-
1500, 2500, or 4500
sphere.
Threaded (tapered ASME B16.34 Class 150, ASME B1.20.1 and
3.1.11 filter element bypass full-flow differential pressure— pipe thread) 300, 400, 600, 900, ASME B16.11
1500, or 2500
the pressure drop across the filter element at which the filter
A
Union-end, MIL-F-1183 (O-ring type) MIL-F-1183 (O-ring
bypass is passing the full-flow rating of the filter. 2 2
silver-brazed 400 lb/in. (2.758 MPa) type) 400 lb/in.
(2.758 MPa)
3.1.12 filter element bypass reseat differential pressure—the
A
Union-end, 803-1385946 1500 803-1385946 1500
pressuredropacrossthefilterelementatwhichthefilterbypass 2 2
silver-brazed lb/in. (10.342 MPa) lb/in. (10.342 MPa)
A
Union-end, 803-1385943 3000 803-1385943 3000
reseats after passing the full-flow rating of the filter.
2 2
silver-brazed lb/in. (20.684 MPa) lb/in. (20.684 MPa)
3.1.13 filter element bypass set differential pressure—the
A
Union-end, 803-1385884 6000 803-1385884 6000
2 2
pressuredropacrossthefilterelementatwhichthefilterbypass butt/socket weld lb/in. (41.369 MPa) lb/in. (41.369 MPa)
Other, as specified as specified as specified
opens.
A
For union inlet and outlet connections, only the pertinent dimensions listed in
3.1.14 filter element collapse strength—the maximum pres-
the applicable documents (military specification or NAVESA requirements) shall
sure drop or differential across the filter element that the
apply.Thefiltershallbesuppliedwiththethreadpiecesonly,withoutthetailpieces
and union nuts.
element must withstand without collapse, damage, or impair-
ment of performance capabilities.
3.1.15 filter element contaminant-holding capacity—also
4. Classification
commonly termed “dirt capacity.” The amount of a contami-
4.1 Filters shall be of the following types, compositions,
nant, expressed in weight, that the element can hold when its
styles, pressure ratings, sizes, end connections, and contami-
resistance to flow causes a pressure drop equal to the contami-
nation removal ratings, as specified in Section 5.
nated filter element pressure drop.
4.1.1 Filter Element Type:
3.1.16 filter element pressure drop—the pressure drop
4.1.1.1 Type 1—Disposable.
across the filter element.
4.1.1.2 Type 2—Cleanable.
3.1.17 filter housing pressure drop—the pressure drop ac- 4.1.2 Filter Element Bypass Composition:
counted for by the filter housing. 4.1.2.1 Composition A: with bypass.
4.1.2.2 Composition B: without bypass.
3.1.18 filter pressure drop—the pressure drop across the
4.1.3 Filter Element Differential Indicator Style:
entire filter (element and housing) at any given flow rate of the
4.1.3.1 Style I: with differential pressure indicator.
service fluid (air or nitrogen).
4.1.3.2 Style II: without differential pressure indicator.
3.1.19 flow capacity—the maximum flow rate that the filter
4.2 Pressure Ratings—Filters shall have pressure ratings
is required to pass.
selected from those listed inTable 1 and specified in Section 5.
3.1.20 hydrostatic shell test pressure—the hydrostatic test
The pressure rating selected shall be the same for both the filter
pressure that the filter is required to withstand without damage.
inlet and outlet.
The filter must be capable of meeting all performance require-
1 1
4.3 Size—Filter sizes shall be ⁄4 NPS (13.5 mm), ⁄2 NPS
ments after the shell test pressure has been removed.
3 1
(21.3 mm), ⁄4 NPS (26.9 mm), 1 NPS (33.7 mm), 1 ⁄4 NPS
3.1.21 media migration—any material released into the
(42.4 mm), 1 ⁄2 NPS (48.3 mm), and 2 NPS (60.3 mm) or as
flow stream by the filter media and its materials of construc-
specified in Section 5 (see Table 2).
tion. This term refers to the tendency of the filter media or
4.4 End Connections—Filtersshallhaveinletandoutletend
“built-in” contamination, such as, welding scale, metal par-
connections selected from those listed in Table 1 and specified
ticles, or air-borne dust combined with the media during its
in Section 5. Inlet and outlet connections shall be identical.
manufacture, to leave the filter and shed or migrate into the
flow stream.
TABLE 2 Filter Performance Characteristics
3.1.22 nominal contaminant removal rating—the smallest
Minimum Dirt-Holding Capacity
Filter Size, NPS
size of contaminant as defined in ARP 901 that the filter will
Grams AC Coarse
retain with 98 % efficiency by weight.
⁄4 (13.5 mm) 6.0
⁄2 (21.3 mm) 6.0
3.1.23 operating pressure—the pressure within the filter
⁄4 (26.9) 10.0
during service.
1 (33.7 mm) 12.0
3.1.24 pressure ratings—the pressure rating of the filter 1 ⁄4 (42.4 mm) 12.0
1 ⁄2 (48.3 mm) 14.0
shall be defined in the documents listed in Table 1. The
2 (60.3 mm) 16.0
pressure rating for a filter is the maximum allowable working
As specified as specified
(service) pressure at 100°F (38°C).
F1791–00
TABLE 3 Filter Pressure Drop Requirements
4.5 Contamination Removal Ratings—Filters shall have
contamination removal ratings selected from the following
NOTE 1—Percentages shown above shall read as percent of the oper-
three categories: 20 µm nominal/50 µm absolute, 5 µm
ating pressure of the filter (see 3.1.23 and 5.1.10).
nominal/18 µm absolute, and 0.4 µm nominal/5 µm absolute.
Filter Pressure Drop
The contamination rating selected shall be specified in Section Maximum
Maximum
DP Indica- Allowable Filter Element Bypass (see S1.0)
5.
Allowable
tor Contami
Clean Ele-
Actuation -nated Ele-
ment (see
5. Ordering Information
(see 7.1.5) ment (see Set Full Flow Reseat
7.1.5)
7.1.5)
5.1 Ordering documentation for filters under the specifica-
2.5 % 4.75 to 6.25 % 7.25 to 8.25 to 6.25 to
tion shall include the following information, as required, to
5.25 % 8% 9.25 % 7%
describe the equipment adequately.
Example:
5.1.1 ASTM designation and year of issue,
Operating pressure: 1000 psi (6895 kPa)
5.1.2 Title, number, and date of this specification, Maximum allowable clean element pressure drop: 25 psi (172 kPa)
DP indicator actuation: 47.5 to 52.5 psi (327 to 346 kPa)
5.1.3 Filter element type (see 4.1.1),
Maximum allowable contaminated element pressure drop: 62.5 psi (431 kPa)
5.1.4 Filter element bypass composition (see 4.1.2),
Filter element bypass set pressure drop: 72.5 to 80 psi (500 to 552 kPa)
Filter element bypass full-flow pressure drop: 82.5 to 92.5 psi (569 to 638 kPa)
5.1.5 Filter element differential pressure indicator style (see
Filter element bypass reseat pressure drop: 62.5 to 70 psi (431 to 483 kPa)
4.1.3),
5.1.6 Filter pressure rating (see 4.2),
6.1.2.6 Cleanability—Cleanable filter elements shall be
5.1.7 Size (see 4.3),
cleanable and reusable by means of scrubbing and washing the
5.1.8 End connections (see 4.4),
outside surface with detergent and tap water and blowing
5.1.9 Contaminant removal rating, absolute/nominal (see
through with compressed air not exceeding 30-psig (207-kPa
4.5),
gage pressure). Once cleaned, the element shall be capable of
5.1.10 Maximum filter operating pressure,
meeting the requirements for a new element. Cleanable filter
5.1.11 Flow capacity required (see 7.1, S1.3),
elements shall not be adversely affected by immersion in water
5.1.12 Supplementary requirements, if any (S1.0 through
and shall be capable of meeting the above criteria for not less
S4.0), and
than five cleaning and reuse cycles.
5.1.13 Maximum vibration frequency and amplitude, if
6.1.2.7 Differential Pressure Indicator—When specified
other than specified (see S1.8).
(see 5.1.5), the filter body shall incorporate a nonelectrical,
6. Filter Design and Construction
“pop up” differential pressure indicator which senses the
6.1 Filters shall incorporate the design features specified in pressure drop across the element and actuates in accordance
6.1.1-6.1.6. withTable3.Onceactuated,aredindicatorbuttonshallremain
6.1.1 Materials of Construction—Materials shall be 300 up until manually reset.
series corrosion-resistant steel (SS304, 304L, 316, or 316L), or 6.1.2.8 O-RingLocations—O-ringsinface-sealapplications
other materials selected to provide compatibility with the line shall have the grooves located in the lower members to
medium, weldability, and corrosion resistance without requir- simplify assembly.
ing painting, coating, or plating. The filter body and the filter 6.1.2.9 Pressure Envelope—The hydrostatic shell test pres-
bowl shall be weld repairable. Materials for contacting parts sures shall be 1.5 times the filter rated pressure at 100°F
shallbeselectedtominimizeelectrolyticcorrosionandgalling. (38°C).
6.1.2 Design Construction Requirements: 6.1.2.10 Connections—The inlet and outlet end connections
of the filter shall be as specified in Table 1. Any exposed
6.1.2.1 GeneralConstruction—Thefiltershallhaveabolted
flanged body and filter bowl to expedite removal of the filter threads shall be protected by plastic caps for shipping.
6.1.2.11 Port Configuration—The filter body shall have
element for cleaning or replacement.
6.1.2.2 Collapse Strength—The filter element shall be ca- in-line inlet and outlet end connections for installation into the
piping system.
pable of withstanding a differential pressure equal to the
maximum inlet pressure rating without structural degradation. 6.1.2.12 PressureLines—Allpressurelinesinthefiltershall
6.1.2.3 Automatic Bypass—When specified (see 5.1.4), the be internally ported.
filter assembly shall incorporate an automatic bypass feature to 6.1.2.13 Accessibility—The filter shall be fully and easily
bypass system fluid automatically around the filter element in accessible for cleaning or repair without removal of the filter
the
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