1、Designation: F 431 04An American National StandardStandard Specification forAir Performance Measurement Plenum Chamber for VacuumCleaners1This standard is issued under the fixed designation F 431; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、 of 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 acceptable details andtolerances for the plenum chamber used
3、in specified airperformance measurement tests for vacuum cleaners.1.2 The plenum chamber is designed for vacuum measure-ments only. (WarningThe plenum chamber has been shownto accurately determine maximum air power values at varioustest points for vacuum cleaners. There is a possibility that theairf
4、low values measured with orifices larger than 2 in. at highflow rates may be erroneous due to the proximity of the top andbottom surfaces to the orifice plate inlet.)1.3 The foot-pound, inch system of units is used in thisstandard. The values in parentheses are given for informationonly.2. Reference
5、d Documents2.1 ASTM Standards:2F 558 Test Method for Measuring Air Performance Charac-teristics of Vacuum CleanersF 820 Test Method for Measuring Air Performance Charac-teristics of Central Vacuum Cleaning Systems2.2 ASTM Adjunct:Orifice Plate Holder Details (F 431)33. Details3.1 Plenum chambers con
6、forming to this specification shallbe fabricated in accordance with the dimensions, tolerances,and notes shown in the following figures:3.1.1 Plenum chamber assembly, see Fig. 1.3.1.2 Orifice plate detail, see Fig. 2.3.1.3 Orifice plate holder and assembly, see Fig. 3.3.2 Manometer connection detail
7、, see Fig. 1(f), Note 17.4. Orifice Plates4.1 Orifice plates conforming to this specification shall befabricated in accordance to the dimensions, tolerances, andnotes shown in the following figure:4.1.1 Orifice plate dimensional detail, see Fig. 2(a).4.1.2 Acceptable machined edges for orifice plate
8、s, see Fig.2(b).5. Keywords5.1 air performance; orifice plate; plenum chamber; vacuumcleaner1This specification is under the jurisdiction of ASTM Committee F11 onVacuum Cleaners and is the direct responsibility of Subcommittee F11.22 on AirPerformance.Current edition approved Aug. 1, 2004. Published
9、 August 2004. Originallyapproved in 1975. Last previous edition approved in 2003 as F 431 03.2For 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
10、Summary page onthe ASTM website.3Available from ASTM International Headquarters. Order Adjunct No.ADJF4031.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.FIG. 1 (a) Plenum Chamber (Material: see Note 8)FIG. 1 (b) Hose Connector Plat
11、e (Material: 0.250-in. (6.35-mm) Steel) (continued)F431042FIG. 1 (c) Hose Connector (Material: Aluminum or Steelsee Note 16) (continued)FIG. 1 (d) Flange Plate (Material: 0.250-in. (6.35-mm) Steel) (continued)F431043FIG. 1 (e) Cleaner Plate (Material: 0.250-in. (6.35-mm) Steel) (continued)F431044NOT
12、E 1All dimensions are measured from inside surfaces.NOTE 2Interior must be clean, smooth, and free of projections or recesses on walls or attachment openings. Internal bracing should not be used tosupport plenum chamber walls.NOTE 3Attachment port edge to be smooth and well rounded.NOTE 4Orifice box
13、 must withstand 180 in. of water (336 mm Hg) negative static pressure without significant distortion of walls or joints afterchamber is completely fabricated and attachment made.NOTE 5All joints and connections must be airtight.NOTE 6Tolerances (unless otherwise specified): one-place decimal 60.031
14、in. (0.080 mm); two-place decimal 60.01 in. (0.25 mm); three-placedecimal 60.005 in. (0.13 mm).NOTE 7Flange plate and manometer connection to be welded to chamber completely around the sides.NOTE 8Plenum chamber minimum material specification 0.187 in. (4.75 mm) thick low carbon steel.NOTE 90.060 in
15、. (1.52 mm) thick rubber seal dimensioned similar to flange plate should be used to seal cleaner and hose connector plates.NOTE 10Bore 0.375 in. (9.54 mm) through hole in plenum chamber for manometer connection and 3.000-in. (76.20-mm) diameter hole for orificeplate assembly.NOTE 11All mating holes
16、to be concentric to within 0.005 in. (0.13 mm) T.I.R. after assembly.NOTE 12A 0.060-in. (1.52-mm) thick rubber seal dimensioned similar to hose connector should be used to seal the hose connector plate to hoseconnector.NOTE 13Six14-20 UNC-2B hex nuts or wing nuts should be used to fasten hose connec
17、tor to hose connector plate.NOTE 14Thirty-six14-20 UNC-2A screws should be used to fasten either the cleaner plate or hose connector flange plate.NOTE 15Alternative materials, thicknesses, and construction methods may be used; however, requirements of Notes 2 and 4 and all internaldimensions must be
18、 complied with.NOTE 16Hose connector internal diameter and length may be changed to accommodate specific hose construction.NOTE 17If a water column manometer or electronic pressure gauge without integration is used, it is recommended that the inner diameter of themanometer connection port be 0.020 i
19、n. or as small as possible to minimize manometer overshoot and bounce. As an alternative to fabricating this holediameter, a hypodermic needle with an inner diameter of 0.020 in. may be placed in the line between the plenum box and the manometer.FIG. 1 (f) Manometer Connection (Material: Steel) (con
20、tinued)F431045FIG. 2 (a) Orifice PlateNOTE 1Proper installation of the sharp orifice into the holder assembly of the plenum chamber is with the sharp edge away from the chamber.Installing the sharp edge orifice toward the chamber may produce incorrect results.NOTE 2The circular sharp edge orifice sh
21、ould have neither wire edges nor burrs and is considered sharp if, when viewed with the naked eye, the edgedoes not seem to reflect a beam of light. The maximum diameter used shall not exceed 2.500 in. (60.350 mm) in diameter.NOTE 3Tolerance (unless other specified): one-place decimal 6 0.031 in. (0
22、.80 mm): two-place decimal 6 0.010 in. (0.25 mm): three-place decimal60.005 in. (0.13 mm).NOTE 4The sizes of orifice plates required by Test Methods F 558 and F 820 are Plate Numbers 3, 5, 7, 9, 10, 11, 12, 13, 14, 15, and 16 (orifice platenos. 1, 2, 4, 6, and 8 are optional).NOTE 5AISI 4130 steel h
23、ardened to RC 42 to 47, finish black oxide, or 316 stainless steel plate 0.0595 6 0.0030 in. (1.511 6 0.076 mm) thick.FIG. 2 (b) Side View, Orifice Plate (continued)F431046FIG. 3 Orifice Plate Holder AssemblyNOTE 1Hole in seal gasket, must center on hole in plenum chamber wall and on throat of mount
24、ing ring when in place.NOTE 2See orifice plate (Fig. 2) for tolerances.NOTE 3Material: rubber, elastomeric sealing material or gasket material for pressure joints.NOTE 4This part may be eliminated if male flange is sealed by weld, solder, or other mechanical methods that make an airtight seal.FIG. 3
25、 (a) Flange Seal Gasket (continued)F431047NOTE 1Screw holes must line up with holes in orifice plate holder (Fig. 3d).NOTE 2See orifice plate drawing (Fig. 2) for tolerances.NOTE 3Material: brass or steel.FIG. 3 (b) Holder Ring (continued)NOTE 1See orifice plate drawing (Fig. 2) for tolerances.NOTE
26、2Material: nylon, polymer or elastomeric compounds.FIG. 3 (c) Washer (continued)F431048NOTE 1With square corner orifice plates a relief is required for plate to bottom in holder 0.054 in. (1.47 mm) deep to match plane of recess.NOTE 2See orifice plate drawing (Fig. 2) for tolerances.NOTE 34.250 in.
27、(107.95 mm) screw hole centerline and holes must match holder ring (Fig. 3b).NOTE 4Material: steel or brass.FIG. 3 (d) Orifice Holder (continued)F431049APPENDIX(Nonmandatory Information)X1. SUGGESTED PROCEDURE FOR LEAK TESTING OF THE PLENUM CHAMBERX1.1 ScopeX1.1.1 This section covers a recommended p
28、rocedure to beused in evaluating leaks in the plenum chamber.X1.2 ProcedureX1.2.1 Connect the plenum chamber to the manometerusing14 in. inside diameter vinyl tubing as shown in Fig. X1.1.X1.2.2 Seal off the test unit inlet using a gasketed plate orother suitable means.X1.2.3 Insert the sealed sucti
29、on orifice plate into the orificeplate holder and secure.X1.2.4 Using a vacuum source, apply 80 to 90 in. of watercolumn vacuum to the suction source tubing inlet depicted inFig. X1.1. (This can be achieved by inserting and sealing thetubing inlet into a crevice nozzle connected to a canistervacuum
30、product which utilizes a two stage vacuum motor/blower system).X1.2.5 Pinch off the suction source tubing using a clampand remove the inlet tubing from the vacuum source. Wait 15to 20 s, in order to allow the water column to drain andstabilize, and then record the initial manometer value to within0.
31、1 in. of water column.NOTE 1Holes are for centering and fastening the mounting ring to plenum chamber wall using screws and a sealing gasket. Optional methods ofmounting are acceptable, provided mounting ring is centered on hole specified in plenum chamber wall and resulting joint is air tight.NOTE
32、2See orifice plate (Fig. 2) for tolerances.NOTE 3The mounting ring usually is positioned on the plenum chamber wall with the orifice plate vertical (when locked). Other positions resultingfrom construction of the plenum chamber are acceptable.NOTE 4Surface “A” must be flat within 0.005 in. (0.13 mm)
33、; finish to be 63 in. (1.6 m).NOTE 5Material: Steel or brass.FIG. 3 (e) Mounting Ring(continued)F4310410X1.2.6 After 15 min has elapsed, record the final manom-eter value to within 0.1 in. water column.X1.2.7 If the initial and final readings differ by more than0.1 in. of water column, investigate t
34、he source of plenumchamber leaks and repair as required. Repeat this test until thedrop in plenum chamber pressure is less than 0.1 in. of watercolumn after 15 min.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this
35、standard. Users of this standard are expressly advised that determination of the validity of any such patent 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 r
36、eviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either 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 therespon
37、sible technical committee, which you may attend. If you feel that your comments have not received a fair 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
38、 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).FIG. X1.1 Test ApparatusF4310411
