ASTM F1791-00(2013)
(Specification)Standard Specification for Filters Used in Air or Nitrogen Systems
Standard Specification for Filters Used in Air or Nitrogen Systems
ABSTRACT
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 particular contamination. Filter element type: type 1 - disposable, and type 2 - cleanable. Filter element bypass composition - composition A - with bypass, and composition B - without bypass. Filter element differential indicator style: style I - with differential pressure indicator, and style II - without differential pressure indicator. Visual examination, hydrostatic shell test, external leakage test, and bubble point test shall be performed to meet the requirements prescribed.
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 particular 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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Standards Content (Sample)
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Designation:F1791 −00 (Reapproved 2013) An American National Standard
Standard Specification for
Filters Used in Air or Nitrogen Systems
This standard is issued under the fixed designation F1791; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.4 Military Standards and Specifications:
MIL-STD-167-1 Mechanical Vibrations of Shipboard
1.1 This specification covers the design, construction, test,
Equipment (Type I—Environmental and Type II—
andperformancerequirementsforairornitrogensystemfilters,
Internally Excited)
referred to hereinafter as filters.These filters are intended to be
MIL-STD-740-1 Airborne Sound Measurements andAccep-
installed in-line to protect equipment from particular contami-
tance Criteria of Shipboard Equipment
nation.
MS16142 Boss, Gasket Seal Straight Thread Tube Fitting,
1.2 The values stated in this specification in inch-pounds
Standard Dimensions for
units are to be regarded as the standard. The SI equivalent
MIL-S-901 Shock Tests, H.I. (High-Impact); Shipboard
shown in parentheses are provided for information only.
Machinery, Equipment and Systems, Requirements for
1.3 This international standard was developed in accor-
MIL-F-1183 Fittings, Pipe, Cast Bronze, Silver-Brazing,
dance with internationally recognized principles on standard- General Specifications for
ization established in the Decision on Principles for the
2.5 Naval SEA Systems Command (NAVSEA)—Government
Development of International Standards, Guides and Recom-
Drawings:
mendations issued by the World Trade Organization Technical
NAVSEA 803-1385884 Unions, Fittings and Adapters Butt
Barriers to Trade (TBT) Committee.
and Socket Welding 6000 PSI, WOG, NPS
NAVSEA 803-1385943 Unions, Silver Brazing 3000 PSI,
2. Referenced Documents
WOG, NPS, for UT Inspection
2 NAVSEA 803-1385946 Unions, Bronze Silver Brazing,
2.1 ASTM Standards:
WOG for UT Inspection
F992 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 Threaded
size of contaminant as defined in ARP 901 that the filter will
B16.25 Buttwelding Ends
retain with 100 % efficiency by weight.
B16.34 Flanged, Threaded, and Welded End
3.1.2 bubble point—the pressure differential across a sub-
2.3 Society of Automotive Engineers (SAE):
merged filter element required to produce a visible and steady
ARP 901 Aerospace Recommended Practice—Bubble-Point
stream of air bubbles. Correlation between bubble point and
Test Method
contaminant removal capability provides an economical means
to test for contaminant removal capability on a production
basis.The bubble point indicates the maximum pore size of the
This specification is under the jurisdiction of ASTM Committee F25 on Ships filter media under static conditions.
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
3.1.3 bubble-tight—no visible leakage over a 3-min period
Machinery and Piping Systems.
usingeitherwatersubmersionortheapplicationofbubblefluid
Current edition approved May 1, 2013. Published May 2013. Originally
approved in 1997. Last previous edition approved in 2006 as F1791 – 00 (2006).
for detection.
DOI: 10.1520/F1791-00R13.
3.1.4 clean filter element pressure drop—the pressure drop
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM across the filter element when it is new or uncontaminated.
Standards volume information, refer to the standard’s Document Summary page on
3.1.5 cleanable filter element—a filter element that, after
the ASTM website.
being contaminated to its dirt-holding capacity (contaminated
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
www.asme.org.
4 5
Available from SAE International (SAE), 400 Commonwealth Dr.,Warrendale, Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
PA 15096, http://www.sae.org. Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1791−00 (2013)
filter element pressure drop), can be restored by cleaning to air-borne dust combined with the media during its
operational condition and with a pressure drop not exceeding manufacture, to leave the filter and shed or migrate into the
the required clean filter element pressure drop. flow stream.
3.1.22 nominal contaminant removal rating—the smallest
3.1.6 contaminant removal rating—this is a measure of the
size of contaminant as defined in ARP 901 that the filter will
size of contaminants that the filter can remove from the flow
retain with 98 % efficiency by weight.
stream.
3.1.23 operating pressure—the pressure within the filter
3.1.7 contaminated filter element pressure drop—the pres-
during service.
sure drop across the filter element when it is contaminated to
the point where cleaning or replacement is required. 3.1.24 pressure ratings—the pressure rating of the filter
shall be defined in the documents listed in Table 1. The
3.1.8 differential pressure indicator actuation pressure—the
pressure rating for a filter is the maximum allowable working
pressure drop across the filter element at which the differential
(service) pressure at 100°F (38°C).
pressure indicator actuates.
3.1.9 disposable filter element—a filter element that, after
4. Classification
being contaminated to its dirt-holding capacity (contaminated
4.1 Filters shall be of the following types, compositions,
filter element pressure drop), cannot be restored to operational
styles, pressure ratings, sizes, end connections, and contami-
conditions and thereafter should be replaced.
nation removal ratings, as specified in Section 5.
3.1.10 external leakage—leakage that escapes to atmo-
4.1.1 Filter Element Type:
sphere.
4.1.1.1 Type 1—Disposable.
4.1.1.2 Type 2—Cleanable.
3.1.11 filter element bypass full-flow differential pressure—
4.1.2 Filter Element Bypass Composition:
the pressure drop across the filter element at which the filter
4.1.2.1 Composition A: with bypass.
bypass is passing the full-flow rating of the filter.
4.1.2.2 Composition B: without bypass.
3.1.12 filter element bypass reseat differential pressure—the
4.1.3 Filter Element Differential Indicator Style:
pressuredropacrossthefilterelementatwhichthefilterbypass
4.1.3.1 Style I: with differential pressure indicator.
reseats after passing the full-flow rating of the filter.
4.1.3.2 Style II: without differential pressure indicator.
3.1.13 filter element bypass set differential pressure—the
4.2 Pressure Ratings—Filters shall have pressure ratings
pressuredropacrossthefilterelementatwhichthefilterbypass
selected from those listed in Table 1 and specified in Section 5.
opens.
Thepressureratingselectedshallbethesameforboththefilter
3.1.14 filter element collapse strength—the maximum pres-
inlet and outlet.
sure drop or differential across the filter element that the
1 1
4.3 Size—Filter sizes shall be ⁄4 NPS (13.5 mm), ⁄2 NPS
element must withstand without collapse, damage, or impair-
3 1
(21.3 mm), ⁄4 NPS (26.9 mm), 1 NPS (33.7 mm), 1 ⁄4 NPS
ment of performance capabilities.
3.1.15 filter element contaminant-holding capacity—also
commonly termed “dirt capacity.” The amount of a
TABLE 1 Filter Inlet and Outlet End Connections
contaminant, expressed in weight, that the element can hold
Applicable Documents
when its resistance to flow causes a pressure drop equal to the
for Dimensional
Type of End Connection Pressure Rating
contaminated filter element pressure drop. Details of
End Connections
3.1.16 filter element pressure drop—the pressure drop
Butt-welded ASME B16.34 Class 150, ASME B16.25
across the filter element.
300, 400, 600, 900,
1500, 2500, or 4500
3.1.17 filter housing pressure drop—the pressure drop ac-
Socket-welded ASME B16.34 Class 150, ASME B16.11
counted for by the filter housing. 300, 400, 600, 900,
1500, 2500, or 4500
3.1.18 filter pressure drop—the pressure drop across the
Threaded (tapered ASME B16.34 Class 150, ASME B1.20.1 and
pipe thread) 300, 400, 600, 900, ASME B16.11
entire filter (element and housing) at any given flow rate of the
1500, or 2500
service fluid (air or nitrogen).
A
Union-end, MIL-F-1183 (O-ring type) MIL-F-1183 (O-ring
2 2
silver-brazed
400 lb/in. (2.758 MPa) type) 400 lb/in.
3.1.19 flow capacity—the maximum flow rate that the filter
(2.758 MPa)
is required to pass. A
Union-end, 803-1385946 1500 803-1385946 1500
2 2
silver-brazed
lb/in. (10.342 MPa) lb/in. (10.342 MPa)
3.1.20 hydrostatic shell test pressure—the hydrostatic test
A
Union-end, 803-1385943 3000 803-1385943 3000
2 2
silver-brazed
pressure that the filter is required to withstand without damage.
lb/in. (20.684 MPa) lb/in. (20.684 MPa)
A
Union-end, 803-1385884 6000 803-1385884 6000
The filter must be capable of meeting all performance require-
2 2
butt/socket weld
lb/in. (41.369 MPa) lb/in. (41.369 MPa)
ments after the shell test pressure has been removed.
Other, as specified as specified as specified
A
3.1.21 media migration—any material released into the flow For union inlet and outlet connections, only the pertinent dimensions listed in the
applicable documents (military specification or NAVESArequirements) shall apply.
stream by the filter media and its materials of construction.
The filter shall be supplied with the thread pieces only, without the tail pieces and
This term refers to the tendency of the filter media or “built-in”
union nuts.
contamination, such as, welding scale, metal particles, or
F1791−00 (2013)
(42.4 mm), 1 ⁄2 NPS (48.3 mm), and 2 NPS (60.3 mm) or as 6.1.2 Design Construction Requirements:
specified in Section 5 (see Table 2). 6.1.2.1 General Construction—The filter shall have a bolted
flanged body and filter bowl to expedite removal of the filter
4.4 End Connections—Filters shall have inlet and outlet end
element for cleaning or replacement.
connections selected from those listed in Table 1 and specified
6.1.2.2 Collapse Strength—The filter element shall be ca-
in Section 5. Inlet and outlet connections shall be identical.
pable of withstanding a differential pressure equal to the
4.5 Contamination Removal Ratings—Filters shall have
maximum inlet pressure rating without structural degradation.
contamination removal ratings selected from the following
6.1.2.3 Automatic Bypass—When specified (see 5.1.4), the
three categories: 20 µm nominal/50 µm absolute, 5 µm
filter assembly shall incorporate an automatic bypass feature to
nominal/18 µm absolute, and 0.4 µm nominal/5 µm absolute.
bypass system fluid automatically around the filter element in
The contamination rating selected shall be specified in Section
the event of excessive flow restriction through the filter
5.
element. The automatic bypass shall be set in accordance with
Table 3 and shall have a capacity equal to or greater than that
5. Ordering Information
of a clean filter assembly.
5.1 Ordering documentation for filters under the specifica-
6.1.2.4 Filter Element Installation—Positive means shall
tion shall include the following information, as required, to
prevent any play or looseness of the filter element in service
describe the equipment adequately.
and prevent cocking or misalignment during installation.
5.1.1 ASTM designation and year of issue,
6.1.2.5 Filter Element Flow Direction—The filter element
5.1.2 Title, number, and date of this specification,
flow direction shall be from the outside to the inside surface of
5.1.3 Filter element type (see 4.1.1),
the element.
5.1.4 Filter element bypass composition (see 4.1.2),
6.1.2.6 Cleanability—Cleanable filter elements shall be
5.1.5 Filter element differential pressure indicator style (see
cleanable and reusable by means of scrubbing and washing the
4.1.3),
outside surface with detergent and tap water and blowing
5.1.6 Filter pressure rating (see 4.2),
through with compressed air not exceeding 30-psig (207-kPa
5.1.7 Size (see 4.3),
gage pressure). Once cleaned, the element shall be capable of
5.1.8 End connections (see 4.4),
meeting the requirements for a new element. Cleanable filter
5.1.9 Contaminant removal rating, absolute/nominal (see
elements shall not be adversely affected by immersion in water
4.5),
and shall be capable of meeting the above criteria for not less
5.1.10 Maximum filter operating pressure,
than five cleaning and reuse cycles.
5.1.11 Flow capacity required (see 7.1, S1.3),
6.1.2.7 Differential Pressure Indicator—When specified
5.1.12 Supplementary requirements, if any (S1.0 through
(see 5.1.5), the filter body shall incorporate a nonelectrical,
S4.0), and
“pop up” differential pressure indicator which senses the
5.1.13 Maximum vibration frequency and amplitude, if
pressure drop across the element and actuates in accordance
other than specified (see S1.8).
withTable3.Onceactuated,aredindicatorbuttonshallremain
up until manually reset.
6. Filter Design and Construction
6.1.2.8 O-Ring Locations—O-rings in face-seal applications
6.1 Filters shall incorporate the design features specified in
shall have the grooves located in the lower members to
6.1.1 – 6.1.6.
simplify assembly.
6.1.1 Materials of Construction—Materials shall be 300
6.1.2.9 Pressure Envelope—The hydrostatic shell test pres-
series corrosion-resistant steel (SS304, 304L, 316, or 316L), or
sures shall be 1.5 times the filter rated pressure at 100°F
other materials selected to provide compatibility with the line
(38°C).
medium, weldability, and corrosion resistance without requir-
ing painting, coating, or plating. The filter body and the filter TABLE 3 Filter Pressure Drop Requirements
bowl shall be weld repairable. Materials for contacting parts
NOTE 1—Percentages shown above shall read as percent of the
shallbeselectedtominimizeelectrolyticcorrosionandgalling.
operating pressure of the filter (see 3.1.23 and 5.1.10).
Filter Pressure Drop
Maximum
Maximum
∆ P Indica- Allowable Filter Element Bypass (see S1.0)
Allowable
tor Contami
Clean Ele-
Actuation -nated Ele-
ment (see
(see 7.1.5) ment (see Set Full Flow Reseat
TABLE 2 Filter Performance Characteristics
7.1.5)
7.1.5)
Minimum Dirt-Holding Capacity
2.5 % 4.75 to 6.25 % 7.25 to 8.25 to 6.25 to
Filter Size, NPS
Grams AC Coarse
5.25 % 8% 9.25 % 7%
⁄4 (13.5 mm) 6.0
⁄2 (21.3 mm) 6.0
E
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