1、Designation: F1330 91 (Reapproved 2018) An American National StandardStandard Guide forMetallic Abrasive Blasting to Descale the Interior of Pipe1This standard is issued under the fixed designation F1330; the number immediately following the designation indicates the year oforiginal adoption or, in
2、the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This guide covers metallic abrasive blasting to descalethe interior of carbon steel
3、pipe.1.2 This guide is recommended for use in conjunction withan abrasive reclamation system.1.3 The values stated in SI units are to be regarded asstandard. The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered
4、 standard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations pr
5、ior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization Technical
6、Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D2200 Practice for Use of Pictorial Surface PreparationStandards and Guides for Painting Steel SurfacesE18 Test Methods for Rockwell Hardness of Metallic Ma-terials2.2 SAE Standards:3J444 Cast Shot and Grit Size Specificati
7、ons for PeeningCleaningJ827 Cast Steel Shot2.3 Other Documents:SSPC SP10 Surface Preparation Specifications4SFSA 20-66 Standard Specification for Cast Steel Abra-sives53. Significance and Use3.1 The maximum length and minimum diameter of the pipeshall be determined by the capacity of the blast equip
8、mentused.3.2 This guide is recommended for removing mill scale, rustscale, paints, zincs, and oxides.4. General Requirements4.1 Before blasting, pipe shall be dry and free of slag andweld spatter which would not be removed by abrasive blasting.Pipe shall also be free of loose dust and debris which m
9、ighthamper the effectiveness of abrasive blasting.4.2 Abrasive blasting shall be accomplished in a dry areawith the ambient air condition such that condensation does notoccur.4.3 Shot and blasting equipment shall be stored at a tem-perature not less than 13C (10F) above the dew point of thesurroundi
10、ng area.4.3.1 Abrasive reclamation system shall include a filtrationsystem capable of removing oxides, debris, dust, shot/gritfragments, and fines.4.4 Compressed air system shall be equipped with moistureremoval devices capable of reducing the dew point of the air atthe nozzle to 18C (approximately
11、0F) or less.4.5 Hoses shall have the maximum practical diameter andshall be as short as possible.4.6 Nozzles shall have the maximum possible aperture asdetermined by the capacity of the blast equipment and aslimited by the pipe diameter.4.7 Internal pipe cleaning nozzle assemblies are commer-cially
12、available and shall be used where required.1This guide is under the jurisdiction of ASTM Committee F25 on Ships andMarine Technology and is the direct responsibility of Subcommittee F25.11 onMachinery and Piping Systems.Current edition approved March 1, 2018. Published April 2018. Originallyapproved
13、 in 1991. Last previous edition approved in 2012 as F1330 91 (2012).DOI: 10.1520/F1330-91R18.2For 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
14、Summary page onthe ASTM website.3Available from SAE International (SAE), 400 Commonwealth Dr., Warrendale,PA 15096, http:/www.sae.org.4Available from Society for Protective Coatings (SSPC), 800 Trumbull Dr.,Pittsburgh, PA 15205, http:/www.sspc.org.5Available from Steel Founders Society of America (S
15、FSA), 780 McArdle Dr.,Unit G, Crystal Lake, IL 60014, http:/www.sfsa.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardizat
16、ion established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.14.7.1 Internal pipe cleaning nozzle assemblies shall includea carriage which is capable of cente
17、ring the nozzle concentri-cally in the pipe being blasted and a nozzle which is capable ofproducing a consistent 360 blast pattern.4.7.2 Diagrams of some commercially available internalpipe cleaning assemblies are provided in Figs. 1-4.4.7.3 If a lance is required, it shall be at least as long as th
18、epipe being blasted.4.8 Blasting shall be accomplished using an abrasive mix-ture of cast steel shot and grit, or with iron shot or grit.4.8.1 Iron or grit may be used if desired.4.8.2 Cast steel shot and grit mixtures shall be sized inaccordance with SAE J444.4.8.3 Reclaimed shot and grit shall be
19、of the same quality asthe original material.4.9 Cast steel shot shall be manufactured in accordance withSAE J827 and tempered to a hardness of 4050 Rockwell C inaccordance with Test Methods E18 (see Table 1).4.10 Cast steel grit shall be manufactured in accordancewith SFSA 20-66 and tempered to a ha
20、rdness of 5565Rockwell C in accordance with Test Methods E18 (see Table2).4.11 Shot and grit size shall be determined by the followingcriteria:4.11.1 Smaller shot and grit produces more impacts per inchand is therefore more effective for removing paints andcorrosion products.4.11.2 Larger shot and g
21、rit produces more kinetic energy perimpact and is therefore more efficient for removing heavierdeposits such as mill scale.4.12 If surface type and profile is specified, abrasive shall beselected using the following criteria:4.12.1 Shot produces a wavy rounded surface profile whichincreases coating
22、area coverage.4.12.2 Grit produces a sharp angular profile which forms abetter anchor pattern for most coatings.4.12.3 Table 3 lists some typical maximum profiles pro-duced by some commercial abrasive media.44.13 Blasting shall be accomplished with a minimum of620-kPa (90-psi) dry air pressure at th
23、e nozzle.4.14 If an abrasive reclamation system is used, it shall becapable of filtering the used abrasive and returning the usablemixture.FIG. 1 For 20- to 50-mm (Approximately34- to 2-in.) Inside Diam-eter PipeFIG. 2 For 50- to 125-mm (Approximately 2- to 5-in.) Inside Diam-eter PipeFIG. 3 For 125
24、- to 305-mm (Approximately 5- to 12-in.) InsideDiameter PipeFIG. 4 For 305- to 915-mm (12- to 36-in.) Inside Diameter PipeTABLE 1 Steel Shot and Grit SpecificationsA,BProperty Shot GritSize:New abrasive asmanufacturedAll material is screened to meet or exceed SAE J444and SFSA 20-66.Chemistry:Carbon
25、0.85 to 1.20 %Manganese 0.60 to 1.00 %Silicon 0.50 to 1.00 %Sulfur 0.05 %Phosphorus 0.05 %Microstructure:Uniformly tempered martensite, with fine, well-distributed carbides, if any.Carbide networks, transformation products, decarburized surfaces,inclusions, and quench cracks are undesirables.Hardnes
26、s:Commonly usedstructural steelC40 to 50 RC 40 to 50 RCD40 to 60 RCACourtesy of Steel Structures Painting Council.BIt is extremely important that contractual documents which specify abrasive to beused clearly designate the abrasive by size and by hardness.CBoth cast steel shot and grit of hardnesses
27、 in the range from 30 to 66 RockwellC may be purchased. However, the abrasives of less than 40 RC and greater than60 RC are generally used for applications other than surface preparation ofstructural steel.DAbrasive manufacturers identify steel grit by designations which include two ormore prefix le
28、tters, followed by the number size. Prefix letters are different for eachof the abrasive suppliers for any given hardness range.F1330 91 (2018)25. Procedure5.1 Pipe shall be located as close as possible to the blastequipment and blown clean of loose debris before blasting.5.2 Pipe with an interior d
29、iameter of 100 mm (approxi-mately 4 in.) or larger may be manually blasted from both endsif both ends are accessible and the pipe length configurationand equipment capabilities are such that the blasted surface isconsistent throughout the pipe.5.3 If pipe is inaccessible from one end, bent, or too l
30、ong tobe hand blasted, it will be necessary to use an internal pipecleaning nozzle assembly.5.3.1 Nozzle assembly shall be placed inside the pipe in amanner such that the nozzle is concentric with the pipe.5.3.2 Nozzle assembly shall then be passed through theentire length of the pipe at a constant
31、rate.5.4 Extreme caution shall be used in all the blasting opera-tions to avoid unnecessary removal of parent metal.5.5 When blasting is completed, pipe shall be blown cleanof residual debris and visually inspected in accordance withPractice D2200 and reblasted as required.5.6 Interior of pipe shall
32、 then be coated when specified.Coatings should be applied to freshly blasted surface beforeany rusting or contamination should occur.6. Workmanship, Finish, and Appearance6.1 Pipe shall be blasted to a near white finish in accordancewith SSPC SP10, or as otherwise specified.7. Keywords7.1 abrasive b
33、lasting; carbon steel pipe; descaling; interiordescaling; marine technology; metallic abrasive; pipe descal-ing; shipsASTM 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
34、 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 andif not revised, ei
35、ther 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, which you may atten
36、d. 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. In
37、dividual 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). Permission rights to photocopy the standard may also be secure
38、d from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 2 Types of Steel Abrasives Most Commonly Used forVarious Structural Steel Blast Cleaning OperationsAAbrasive TypeSize RangeBHardness (RC)Shot Grit40 to5050 to60New steel X S170 to S390 XFabricate
39、d new steel XXS170 to S390G50 to G25XXXHeat-treated steel X G50 to G25 XHeavy steel plate X S230 to S390 XCorroded steel X G50 to G25 XWeld scale X S170 to S280 XBrush blast X S170 to S280 XRepair work X G50 to G40 XMaintenance X G80 to G18 X XACourtesy of Steel Structures Painting Council.BSize Ran
40、ge refers to working mix (operating mix) for recirculating abrasive blastsystems. For additional information see Vol 1, Chapter 2 of the “Steel StructuresPainting Manual.”TABLE 3 Typical Maximum Profiles Produced by SomeCommercial Abrasive MediaAAbrasiveSteelAbrasivesBMaximum ParticleSize NBS Screen
41、No.Typical Profile,maxHeight (mils),avg, maxShot S230 No. 18 + No. 20 2.9 0.2 2.2 0.3Shot S280 No. 16 + No. 18 3.5 0.3 2.5 0.4Shot S330 No. 14 + No. 16 3.8 0.4 2.8 0.5Shot S390 No. 12 + No. 14 4.6 0.5 3.5 0.7Grit G50 No. 25 + No. 30 2.2 0.3 1.6 0.3Grit G40 No. 18 + No. 20 3.4 0.4 2.4 0.5Grit G25 No.
42、 16 + No. 18 4.6 0.5 3.1 0.7Grit G14 No. 10 6.5 0.8 5.1 0.9ACourtesy of Steel Structures Painting Council.BProfile heights shown for steel abrasives were produced with conditionedabrasives of stabilized operating mixes in recirculating abrasive blast cleaningmachine. Profile heights produced by new abrasives having screen analysesshown in SAE J444 will be appreciably higher.Cast steel shot: Hardness 40 to 50 Rockwell C.Cast steel grit: Hardness 55 to 60 Rockwell C.F1330 91 (2018)3
