1、Designation: F 1138 98 (Reapproved 2003)An American National StandardStandard Specification forSpray Shields for Mechanical Joints1This standard is issued under the fixed designation F 1138; the number immediately following the designation indicates the year oforiginal adoption or, in the case of re
2、vision, 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specificati
3、on describes the manufacturing require-ments for spray shield stock and the fabrication and installationrequirements for spray shields made from that stock.1.1.1 Sections 2-14 address the manufacturing requirementsfor the spray shield stock. Annex A1 addresses the fabricationand installation require
4、ments for the spray shields.1.1.2 Fig. 1 shows the typical construction of a spray shield.Figs. 2-6 show methods of installation of a spray shield onvarious mechanical joints.1.2 The shields are intended for use around mechanicaljoints (flanged, bolted unions, and so forth) in liquid pipingsystems t
5、o prevent the impingement of flammable liquid on hotsurfaces or fluids onto electrical switchboards and componentsresulting from a leak in the mechanical joint.1.3 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.2. Refe
6、renced Documents2.1 ASTM Standards:2A 176 Specification for Stainless and Heat-Resisting Chro-mium Steel Plate, Sheet, and StripA 276 Specification for Stainless Steel Bars and ShapesA 580 Specification for Stainless Steel WireB 134 Specification for Brass WireB 164 Specification for Nickel-Copper A
7、lloy Rod, Bar, andWireB 166 Specification for Nickel-Chromium-Iron Alloys(UNS N 06600, N 06601, and N 06690) and NickelChro-miumCobaltMolybdenum Alloy (UNS N 06617) Rod,Bar, and WireD 1388 Test Method for Stiffness of FabricsD 1424 Test Method for Tearing Strength of Fabrics byFalling-Pendulum Type
8、(Elmendorf) ApparatusD 1682 Test Methods for Breaking Load and Elongation ofTextile Fabrics3D 1777 Method for Measuring Thickness of Textile Mate-rialsD 3389 Test Method for Coated Fabrics Abrasion Resis-tance (Rotary Platform, Double-Head Abrader)D 3776 Test Methods for Mass Per Unit Area (Weight)
9、ofFabricD 3786 Test Method for Hydraulic Bursting Strength ofKnitted Goods and Nonwoven Fabrics: Diaphragm Burst-ing Strength Tester MethodD 3951 Practice for Commercial PackagingF 501 Test Method for Aerospace Materials Response toFlame, With Vertical Test Specimen (For Aerospace Ve-hicles Standard
10、 Conditions)2.2 American Association of Textile Chemists and ColoristsStandards:AATCC-22 Water Repellency, Spray Test4AATCC-35 Water Resistance, Rain Test4AATCC-127 Water Resistance, Hydrostatic Pressure Test42.3 Military Standards:MIL-C-20079 Cloth, Glass, Tape, Textile Glass and Thread,Glass5MIL-C
11、-20696 Cloth, Coated, Nylon Waterproof52.4 Federal Standard:WW-C-440 Clamps, Hose (Low Pressure)53. Ordering Information3.1 ASTM designation and year of issue,3.2 Length and width required (see 7.1), and3.3 Type of stainless steel (see 4.1).1This specification is under the jurisdiction of ASTM Commi
12、ttee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.07 onGeneral Requirements.Current edition approved Dec. 1, 2003. Published January 2004. Originallyapproved in 1988. Last previous edition approved in 1998 as F 1138 98.2For referenced ASTM standards, visit t
13、he 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.3Withdrawn.4Available from American Association of Textile Chemists and Colorists(AATCC), One Davis
14、Dr., P.O. Box 12215, Research Triangle Park, NC 27709-2215.5Available from Superintendent of Documents, U.S. Government PrintingOffice, Washington, DC 20402.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.4 Type of lacing hardware
15、required (see 4.1.1).4. Materials and Manufacture4.1 Lacing hooks, lacing rings, and lacing washers (see Fig.7) shall be constructed of stainless steel in accordance withSpecifications A 176, A 276, or A 580.4.1.1 Lacing rings may be used instead of lacing hookswhere practicable or preferable (see 3
16、.3).4.1.2 Lacing washers for fastening hooks or rings shall betwo-hole washers.4.2 Stitch wire (Piece 5 in Table 1) shall be constructed ofstainless steel in accordance with Specification A 580.4.3 The aluminized glass cloth, thread, and the protectiveouter jacket shall be constructed of material as
17、 specified inTable 1 and Table 2.5. Physical and Mechanical Properties5.1 The physical and mechanical properties for the alumi-nized glass cloth, thread, and protective outer jacket shall be asspecified in Table 1 and Table 2.6. Requirements6.1 If lacing hooks or rings are of the type that fasten by
18、stitching, the hooks or rings shall be attached to the backupwashers using a wire stitch machine and wire (Pieces 5 or 8 inTable 1).6.2 Lacing anchor/self-locking washer-type systems shallnot be used on spray shields.7. Dimensions and Permissible Variations7.1 The material for shields shall be stand
19、ardized as given inTable 3 tolerances to be +14 in. (6 mm) and 0 in. for width.FIG. 1 Spray Shield Construction (Typical)FIG. 2 Installation of Butterfly Valve ShieldFIG. 3 Spray Shield for Pump Inlet HeadF 1138 98 (2003)28. Workmanship, Finish, and Appearance8.1 The seam on both sides of the spray
20、shield shall beintact.8.1.1 On drawstring-type shields, there shall be ampleoverlap in the seam to allow wire to be run through the entirelength of the shield.8.2 There shall be no tears in the uncovered aluminumportion of the shield where contact is made with the mechani-cal joint (see Fig. 1).8.3
21、There shall be no tears in the protective outer jacketsuch that the aluminized glass cloth underneath is exposed.8.4 There shall be no holes or openings of any kind in theshields other than those made by sewing or the attachment oflacing hooks or rings.9. Sampling, Selection, and Number of Specimens
22、9.1 Unless otherwise specified, the sampling of, selectionof, and number of specimens for the aluminized glass cloth,thread, and protective outer jacket shall be as specified in theapplicable test methods listed in Table 1 and Table 2.10. Test Methods10.1 The methods for testing the aluminized glass
23、 cloth,thread, and protective outer jacket shall be as specified in Table1 and Table 2.11. Inspection11.1 Unless otherwise specified in the contract or purchaseorder, the contractor is responsible for performing inspectionsto determine conformance to the requirements specified inSection 8 of this sp
24、ecification.12. Rejection and Rehearing12.1 Material that fails to conform to the requirements ofthis specification may be rejected. Rejection should be reportedto the producer or supplier promptly and in writing. In case ofdissatisfaction with the results of the test, the producer orsupplier may ma
25、ke claim for a rehearing.13. Product Marking13.1 Indelible stamp denoting the width of the shield shallbe placed at 24-in. (610-mm) intervals on the visible foil sideof the shield so that it will be visible when the shield is rolledand packaged.14. Packaging and Package Marking14.1 The packaging, pa
26、cking, and marking of containersshall be in accordance with Practice D 3951, with the excep-tions noted in 14.1.1 and 14.1.2.14.1.1 Each container used for spray shield packaging shallcontain installation instructions as shown in Annex A2.14.1.2 Metal strapping shall not be used for containerclosure
27、 and reinforcement.14.2 Installed lacing hooks and aluminized cloth shall be sopackaged that there shall be no damage to the cloth duringshipment.15. Keywords15.1 lacing; mechanical joints; shield; spray shieldFIG. 4 Spray Shield for Simplex StrainerF 1138 98 (2003)3FIG. 5 Spray Shield for Butterfly
28、 ValveFIG. 6 Spray Shield for Valve BonnetFIG. 7 Optional Lacing HardwareF 1138 98 (2003)4TABLE 1 List of MaterialPieceNumberDescription Quality Material Specification Remarks1 Hook, lacing as required stainless steel302, 304 or 316ASTM A 176, A 276, A 580 see 4.12 Cloth, aluminum foil, glass as req
29、uired glass/aluminum MIL-C-20079 Type I,Class 103 Thread as required glass MIL-C-20079 Type III,Class 3 (for machine sewing)nylon white, Size 5 Z-twist,three-ply4 Washer, blank as required stainless steel304 or 316ASTM A 176, A 27634-in. diameter 3 0.030 in.thick5 Wire, stitch as required stainless
30、steel301, 304 or 316ASTM A 580 see 6.16 Label, identification as required see 137 Clamp, hose as required Cres 201 WW-C-440 Type F8 Wire as required brassCr-Ni-alloyCu-Ni-alloystainless steel304 or 316ASTM B 134ASTM B 166ASTM B 164ASTM A 58017 or 18 gage17 or 18 gage17 or 18 gage17 or 18 gage9 Rings
31、, lacing as required stainless steel302, 304 or 316ASTM A 276, A 580 see 4.1.110 Fabric, protective outer jacket as required fiberglass cloth/siliconecoated fiberglasssee Table 2TABLE 2 Material DataProtective Outer JacketTypical PropertiesSilicone Coated Fiber-glass Cloth DataStyle SatinWeight, oz/
32、yd216.10Thickness, in. 0.018Count, W 3 F543 48Breaking strength, lb/in.W 3 F625 3 625Weave 8 harnessWidth, in. 50 or 60Coated Properties Test Methods Product SpecificationCoating . . . Balanced, curedColor per standard SilverThickness Test Method D 1777 0.019Weight, oz/yd2Test Method D 3776 20.00Fla
33、me resistance Test Method F 501 08 flame (self-extinguishing)Breaking strength, lb/in.W 3 FTest Methods D 1682 470 3 410Tear strength, lb/in. W 3 F Test Methods D 1424 35 3 31Abrasion resistance Test Method D 3389(CS-10, 500 GMS)200 3 300 minMullen hydrostatic, psi AATCC-127 20 minWater resistance,
34、rain test AATCC-35 Pass 0 GMS 6 5ftPass 0.10 GMD 6 8ftWater repellancy, spray test AATCC-22 Pass 100 ratingMullen burst, psi Test Method D 3786 800 minClark stiffness, CM Test Method D 1388 18.0 maxOil resistance MIL-C-20696 PassAromatic hydrocarbonfluid resistanceMIL-C-20696 PassF 1138 98 (2003)5AN
35、NEXES(Mandatory Information)The requirements of this section apply only to the fabrication and installation of the spray shields.A1. FABRICATION OF SPRAY SHIELDSA1.1 To determine spray shield length and width, the flangethat is to be shielded shall be measured as follows:A1.1.1 Shield length:Measure
36、 the circumference of the flange. Add an overlap of14 of the circumference measurement, with the maximumbeing 8 in. (203 mm) and the minimum being 1 in. (25 mm).A1.1.1.1 To prevent dirt accumulation, the overlap shall bepointed downward (see Fig. A1.1).A1.1.2 Shield width:Measure from the inside edg
37、e of the bolt to the edge of theflange (A). Measure the combined flange thickness ( B). In thefollowing illustration, this would be “A + B + A” as a minimumrequirement.A1.1.2.1 If the measured width contains a fraction, the nextwider shield stock shall be used (see 7.1). For example, if themeasured
38、width is 512 in. (140 mm), 6-in. (152-mm) wideshield stock shall be used.TABLE 3 Shield Material DimensionsLength, ft (m) Width, in. (mm)30 (9) 5 (127)30 (9) 6 (152)30 (9) 7 (178)30 (9) 8 (203)20 (6) 9 (229)20 (6) 10 (254)20 (6) 11 (279)20 (6) 12 (305)NOTE 1Maximum overlap is 8 in. (203 mm).NOTE 2Mi
39、nimum overlap is 1 in. (25 mm).FIG. A1.1 Shield LengthF 1138 98 (2003)6A2. INSTALLATION OF SPRAY SHIELDSA2.1 General Installation:A2.1.1 The shield shall be centered on the joint, wrappedsnugly around the sides of the joint, and laced tightly with wire.A2.1.1.1 Clamps or wire, or both, are to be obt
40、ained by theuser and are not to be supplied on the shield as manufactured.A2.2 Standard Installation:A2.2.1 Cut two lengths of lacing wire 6 in. (152 mm) longerthan the length of the shield.A2.2.2 Cut away seam material on each side of overlap andinsert lengths of wire into seams on both sides of sh
41、ield untilthe wire emerges at the other end.A2.2.3 Wrap shield around flange with aluminized cloth onthe inside.A2.2.4 Fold shield edges down over flange bolts.A2.2.5 Twist ends of wire together sufficiently to maintaintightness, cut excessive wire, and fold down to be flat onshield. If additional t
42、ightness is required, use the lacing hooksshown in Fig. 7.A2.3 Optional Installation (Lacing Hooks or Rings):A2.3.1 Cut away seam material on each side of overlap.There shall be a58-in. (16-mm) space between the end ofshield overlap and the first pair of lacing hooks.A2.3.1.1 Remove lacing hooks tha
43、t would be under theoverlap.A2.3.2 Wrap shield around flange with aluminized glasscloth on the inside.A2.3.3 Fold shield edges down over flange bolts.A2.3.4 String wire through hooks on both sides and pulltight to secure shield in place.A2.3.5 Twist end of wire together sufficiently to maintaintight
44、ness, cut excessive wire, and fold down to be flat onshield.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such pa
45、tent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited ei
46、ther for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair
47、 hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).F 1138 98 (2003)7
