1、Designation: F 1309 98 (Reapproved 2003)An American National StandardStandard Practice forInstallation Procedures for Fitting Chocks to MarineMachinery Foundations1This standard is issued under the fixed designation F 1309; the number immediately following the designation indicates the year oforigin
2、al adoption or, in the case 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 practice covers the acceptable methods of fittingchocks to
3、marine machinery foundations.1.2 The values stated in SI units shall be regarded asstandard. The values in parentheses are for information only.1.3 This standard does not purport to address the safetyconcerns associated with its use. It is the responsibility of theuser of this standard to establish
4、appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:2A 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsD 638 Test Method for Tensile Properties of PlasticsD 648 Test Method fo
5、r Deflection Temperature of PlasticsUnder Flexural Load in the Edge-Wise PositionD 695 Test Method for Compressive Properties of RigidPlastics2.2 Other Documents:American Bureau of Shipping Rules for Building andClassing Steel Vessels3American Welding Society Publication, AWSD1.1 Structural Welding
6、Code43. Significance and Use3.1 This practice provides the three principal methods offitting chocks to marine machinery foundations to ensure thatthe machinery is free of vibration and perfectly aligned afterinstallation.3.1.1 The three principal methods of installing chocksdescribed herein are as f
7、ollows:3.1.1.1 Type AEpoxy-based resin, nonshrinking Chock-fast Orange PR 610 TCF by Philadelphia Resin Corp., or equal,and3.1.1.2 Type BTwo-piece wedge chocks.3.1.1.3 Type CSolid, one-piece fitted chocks.4. Procedure4.1 General Requirements for Types A, B, and C ChockingSystems:4.1.1 Machining:4.1.
8、1.1 Type A chocks, machinery bedplates, foundationplates, and bolts do not require finish machining if the chocksare not designed to be removed. Unless specified otherwise,Types B and C chock, bolts/studs, machinery bedplate, foun-dation plates, and fitted holes need to be finished machined andfitte
9、d.4.1.1.2 Surfaces in way of the chock areas on the machinerybedplate and the foundation plate may be machined beforeinstallation or while the ship is not waterborne, or both.4.1.1.3 Unless otherwise specified, all finished surfacesshall be finished to a maximum of 0.003mm roughness heightaverage (R
10、HA).4.1.1.4 Finished areas on the machinery bedplate and thefoundation plate in way of the chocks shall be sufficientlygreater in size than the chock to prevent interference from theunfinished area with the chock during installation.4.1.1.5 Spotface hole edge radius shall be such that therewill not
11、be any interference between it and the bolt head-to-shank radius. The spotface area shall be sufficiently greater inarea than that of the bolt head or nut so as not to cause anyinterference when tightening or with the tooling used. Thespotface surfaces shall be perpendicular to the finished fittedho
12、le centerline.4.1.2 Installation:4.1.2.1 The ship must be waterborne and fairly well com-pleted before final alignment is accomplished. Ship shall betrimmed as close to the even keel position as practicable. Thesame trim position shall be maintained throughout the align-ment procedure. No heavyweigh
13、t shall be moved, loaded, orunloaded during alignment; ramps for Ro-Ros shall not belowered or hoisted.1This practice is under the jurisdiction of ASTM Committee F25 on Ships andMarine Technology and is the direct responsibility of Subcommittee F25.03 onOutfitting and Deck Machinery.Current edition
14、approved Dec. 1, 2003. Published January 2004. Originallyapproved in 1990. Last previous edition approved in 1998 as F 1309 - 98.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informati
15、on, refer to the standards Document Summary page onthe ASTM website.3Available from American Bureau of Shipping (ABS), ABS Plaza, 16855Northchase Dr., Houston, TX 77060.4Available from The American Welding Society (AWS), 550 NW LeJeune Rd.,Miami, FL 33126.1Copyright ASTM International, 100 Barr Harb
16、or Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.2.2 Final machining of the fitted or bearing areas of themachinery bedplate to chock to foundation plate and themating areas of the fitted portion of the bolt/stud shank and tothe hole wall shall be a minimum of 85 % uniforml
17、y distrib-uted around the mating area. A light coat of Prussian blue shallbe used to check the contact areas.4.1.2.3 Machinery shall be aligned using a sufficient numberof jackscrews, shims, and wedges to accommodate adequateup-down, port-starboard, and fore-aft movement without dis-torting the mach
18、inery bedplate or foundation plate and, oncealigned, be able to hold that alignment firmly during the finalchock installation and bolt-fitting phase.4.1.2.4 A sufficient number of fitted bolts and chocks shallbe installed to maintain the alignment and prevent any relativemovement between the machine
19、ry and the foundation as aresult of vibration and sea state inputs. Number and position offitted bolts shall comply with the engine manufacturersrequirements, if any.4.1.2.5 Bolts shall be installed from the bottom up unlesssurrounding interferences dictate otherwise.4.1.2.6 The length of the fitted
20、 portion of the bolt/stub shankshall be 95 % of the combined thickness between spotfaces ofthe machinery bedplate, chock, and foundation plate.4.1.2.7 Final reaming of the fitted bolt holes or machining ofthe bolt shank shall occur after final alignment.4.1.2.8 Final torquing of each bolt/nut/stub a
21、ssembly shallbe of sufficient torque to preload the nonfitted portions of thebolt/nut/stub enough to prevent loosening as a result ofvibrations, operations, hull, and sea state inputs.4.1.2.9 Welding shall be performed in accordance withAmerican Bureau of Shipping or the American WeldingSociety, Str
22、uctural Code AWS D1.1.4.1.3 Testing (If Specified):4.1.3.1 Steel tension tests shall be made in accordance withTest Methods and Definitions A 370.4.1.3.2 Compression yield and modulus of elasticity testsshall be made in accordance with Test Method D 695.4.1.3.3 The tensile ultimate test shall be mad
23、e in accordancewith Test Method D 638.4.1.3.4 The shear ultimate test, the heat distorting tempera-ture test, and the shock resistance test shall be made inaccordance with Test Method D 648.4.2 Type AEpoxy-based resins are pourable compoundsthat are poured into properly contained and vented volumesa
24、nd cure at normal ambient temperatures without shrinkage toform a durable solid.4.2.1 Provision for Future Machinery RemovalTo preventadhesion of chocks to adjoining surfaces and facilitate futureremoval of machinery, spray an aerosol release agent on allcontact surfaces. This precaution allows thes
25、e chocks to beremoved in a similar manner to steel chocks.4.2.2 Applicable Techniques:4.2.2.1 Position dams to retain the compound during pour-ing and curing without distortion. Damming materials may beexpanded plastic, foam rubber stripping and sheet metal, orlight gage flat bar. (See Fig. 1.)4.2.2
26、.2 Follow resin manufacturers instructions includingthe relative design parameters on loading, temperature, allow-able thickness, additional design, installation, bolt tension, andinspection.4.2.3 Foundation BoltsInstall hold-down bolts beforepouring of resin. Tension (torque) bolts only after resin
27、manufacturers recommended cure time.4.3 Type B, Two-Piece Wedge ChockThe two-piecewedges are drop-forged, medium steel or machined from steelplate of equal strength or of other materials as specified.4.3.1 Applicable TechniquesFig. 2 indicates the configu-ration of Type C chocks to the machinery bed
28、plate and thefoundation plate.4.3.1.1 The taper on the sloped faces of each half of thechock must not exceed a rise of one over a run of four.4.3.1.2 Align machinery in place as described in 4.1 andinstall the lower half of the tapered chock in place with thethicker end in first from the place insta
29、llation. Ensure it doesnot move by tach welding. Do not allow distortions orseparations.4.3.1.3 Spotface the upper surface of the machinery bed-plate where the finish has not been indicated.4.3.2 Fitting of Chocks and BoltsFig. 3 indicates thefitting of Type B chocks in way of the bedplates and foun
30、dationpieces.4.3.3 Bearing AreaTo obtain the 85 % bearing area, eithermeasure the spacing between the machine bedplate and thefoundation plate at the four corners in way of the proposedchock location and machine the chocks as a unit to fit or, if thelower half of the taper chock is in place, take th
31、e samemeasurement between it and the machinery bedplate in way ofthe lower half. Machine the upper half to fit and verify theadequacy of the contact area.4.3.4 Drill holes in the bottom chock piece and foundationplate, either with machinery unit in place or by the marking ofholes and lifting the uni
32、t clear. Spotface the bottom side of thefoundation plate in way of bolt heads.4.3.5 Fitted BoltsFit the bolts/studs to the holes bymeasuring diameters at 90 to each other in approximately fourplanes equally spaced through the hole and machine thebolt/stub shank to fit or ream the hole to fit the bol
33、t. Torque thenuts to the proscribed torque.4.3.6 Excess Length of ChockDetermine the length (withan extra allowance for fitting), and the thickness of the topmostpiece of the permanent chock assembly (wedge) at installation.Drill the wedge only after it has been finally fitted in place.Face off the
34、excess length flush with plate edges, and preservethe relative positions of chock parts by tackwelding. For therestrictions and size of the taper see Fig. 3.4.4 Type C, Solid, One-Piece Fitted ChocksThe chocksare medium steel machined from plate steel consistent with themachinery bedplate and founda
35、tion plate and the loads im-posed or of other materials as specified.4.4.1 Applicable TechniquesFig. 2 indicates the configu-ration of Type C chocks to the machinery bedplate and thefoundation plate.4.4.2 Align machinery in place as described in 4.1. Do notallow distortions or separations.F 1309 98
36、(2003)24.4.3 Bearing AreaTo obtain the 85 % bearing area,measure the spacing between the machinery bedplate and thefoundation plate, measure the gap at the four corners in way ofthe proposed chock location as indicated in Fig. 2, machine thechock to fit, and verify the adequacy of the bearing area.4
37、.4.4 Fitted BoltsFit the bolts/studs to the holes bymeasuring diameters at 90 to each other in approximately fourplanes equally spaced through the hole and machine thebolt/stub shank to fit or ream the hole to fit the bolt/stud.Torque the nuts to the proscribed torque.5. Keywords5.1 chocks; fitting
38、chocks; foundations; installation; ma-chinery foundations, marine; procedures; shipFIG. 1 Type A Epoxy-Based Resin ChockF 1309 98 (2003)3FIG. 2 Type C Chock Solid (One Piece)F 1309 98 (2003)4SUPPLEMENTARY REQUIREMENTSS1. ScopeS1.1 Supplementary requirements only apply if specified inthe contract or
39、purchase order.S2. Reference DocumentsS2.1 Military Document:MIL-S-901 Shock Tests, H.I. (High Impact); Shipboard,Machinery, Equipment and Systems, Requirements for5Supplementary Test RequirementsS3.1 If specified, shock in accordance with MIL-S-901.5Available from Naval Publications and Forms Cente
40、r, 5801 Tabor Ave.,Philadelphia, PA 191205099, Attn: NPODS.NOTE 11 in. = 25.4 mmFIG. 3 Type B, Wedge Chocks (Two Piece)F 1309 98 (2003)5ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this stan
41、dard 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 reviewed every five years and
42、if 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 theresponsible technical committee, w
43、hich 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 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 1309 98 (2003)6
