1、Designation: F1330 91 (Reapproved 2012)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 t
2、he 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 p
3、ipe.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 as thestandard. The values given in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety concerns, if any, as
4、sociated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D2200 Practice for Use of Pictorial Surface Preparation
5、Standards and Guides for Painting Steel SurfacesE18 Test Methods for Rockwell Hardness of Metallic Ma-terials2.2 SAE Standards:3J444 Cast Shot and Grit Size Specifications for PeeningCleaningJ827 Cast Steel Shot2.3 Other Documents:SSPC SP10 Surface Preparation Specifications4SFSA 20-66 Standard Spec
6、ification 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 equipmentused.3.2 This guide is recommended for removing mill scale, rustscale, paints, zincs, and oxides.4. General Requirements4.1 Befo
7、re 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 mighthamper the effectiveness of abrasive blasting.4.2 Abrasive blasting shall be accomplished in a dry areawith the ambient air cond
8、ition 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 thesurrounding area.4.3.1 Abrasive reclamation system shall include a filtrationsystem capable of removing oxides, debris, dust, shot/gritfragme
9、nts, 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 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
10、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 available and shall be used where required.4.7.1 Internal pipe cleaning nozzle assemblies shall includea carriage which is capable o
11、f centering 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 lon
12、g as thepipe 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.1This guide is under the jurisdiction of ASTM Committee F25 on Ships andMarine Technology and is the direct respon
13、sibility of Subcommittee F25.11 onMachinery and Piping Systems.Current edition approved May 1, 2012. Published May 2012. Originallyapproved in 1991. Last previous edition approved in 2006 as F1330 91 (2006).DOI: 10.1520/F1330-91R12.2For referenced ASTM standards, visit the ASTM website, www.astm.org
14、, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Society of Automotive Engineers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001, http:/www.sae.org.4Availab
15、le from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor,Pittsburgh, PA 15222-4656, http:/www.sspc.org.5Available from Steel Founders Society of America (SFSA), 780 McArdle Dr.,Unit G, Crystal Lake, IL 60014, http:/www.sfsa.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO B
16、ox C700, West Conshohocken, PA 19428-2959, United States.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 of the same quality asthe original material.4.9 Cast steel shot shall be manufactured in accordance withSAE J827 and tempe
17、red to a hardness of 40-50 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 hardness of 55-65 Rock-well C in accordance with Test Methods E18 (see Table 2).4.11 Shot and grit size shall be determined
18、 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 grit produces more kinetic energy perimpact and is therefore more efficient for removing heavierdeposits such as mill
19、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 area coverage.4.12.2 Grit produces a sharp angular profile which forms abetter anchor pattern for most coatings.4.12.
20、3 Table 3 lists some typical maximum profiles pro-duced by some commercial abrasive media.4FIG. 1 For 20- to 50-mm (Approximately34- to 2-in.) InsideDiameter PipeFIG. 2 For 50- to 125-mm (Approximately 2- to 5-in.) InsideDiameter PipeFIG. 3 For 125- to 305-mm (Approximately 5- to 12-in.) InsideDiame
21、ter 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 0.85 to 1.20 %Manganese 0.60 to 1.00 %Silicon 0.50 t
22、o 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.Hardness:Commonly usedstructural steelC40 to 50 RC 40 to 50
23、 RCD40 to 60 RCACourtesy of Steel Structures Painting Council.BIt is extremely important that contractual documents which specify abrasive tobe used clearly designate the abrasive by size and by hardness.CBoth cast steel shot and grit of hardnesses in the range from 30 to 66 RockwellC may be purchas
24、ed. 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 letters, followed by the number size. Prefix letters a
25、re different for eachof the abrasive suppliers for any given hardness range.TABLE 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 XFabricated new steel XXS170 to S
26、390G50 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 Range refers to working mi
27、x (operating mix) for recirculating abrasiveblast systems. For additional information see Vol 1, Chapter 2 of the “SteelStructures Painting Manual.”F1330 91 (2012)24.13 Blasting shall be accomplished with a minimum of620-kPa (90-psi) dry air pressure at the nozzle.4.14 If an abrasive reclamation sys
28、tem is used, it shall becapable of filtering the used abrasive and returning the usablemixture.5. 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 diameter of 100 mm (approxi-mately 4 in.) or large
29、r 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 long tobe hand blasted, it will be necessary to us
30、e 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 rate.5.4 Extreme caution shall be used in all the
31、 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 withStandard D2200 and reblasted as required.5.6 Interior of pipe shall then be coated when specified.Coatings should be
32、 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 blasting; carbon steel pipe; descaling; interiorde
33、scaling; 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 advised that determination of the validity of an
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38、.TABLE 3 Typical Maximum Profiles Produced by SomeCommercial Abrasive MediaAAbrasiveSteelAbrasivesBMaximum ParticleSize NBS ScreenNo.Typical Profile,maxHeight (mils),avg, maxShot S230 No. 18 + No. 20 2.9 6 0.2 2.2 6 0.3Shot S280 No. 16 + No. 18 3.5 6 0.3 2.5 6 0.4Shot S330 No. 14 + No. 16 3.8 6 0.4
39、2.8 6 0.5Shot S390 No. 12 + No. 14 4.6 6 0.5 3.5 6 0.7Grit G50 No. 25 + No. 30 2.2 6 0.3 1.6 6 0.3Grit G40 No. 18 + No. 20 3.4 6 0.4 2.4 6 0.5Grit G25 No. 16 + No. 18 4.6 6 0.5 3.1 6 0.7Grit G14 No. 10 6.5 6 0.8 5.1 6 0.9ACourtesy of Steel Structures Painting Council.BProfile heights shown for steel
40、 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 (2012)3
