1、Designation:F105717Standard Practice forEstimating the Quality of Extruded Poly(Vinyl Chloride)(PVC)Pipe by the Heat Reversion Technique1This standard is issued under the fixed designation F1057;the number immediately following the designation indicates the year oforiginal adoption or,in the case of
2、 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.Scope*1.1 This practice covers a procedure for estimating thequality of extruded poly(vinyl chloride)(PVC)plas
3、tic pipes byobserving the reaction of pipe specimens after exposure to hotair in the oven at 180 6 5C for 30 min duration.1.2 This standard does not purport to address all of thesafety problems,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-pri
4、ate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of Internat
5、ional Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Significance and Use2.1 This practice is applicable to distinguish between prop-erly and improperly extruded PVC plastic pipe.It can be usedto:2.1.1 Reveal incomplete exsicca
6、tion of compound before orduring extrusion(Note 1),2.1.2 Determine the presence of stress in the pipe wallproduced by the extrusion process(Note 2),2.1.3 Determine whether unfused areas are present,and2.1.4 Reveal contamination.NOTE1Residual moisture in the compound vaporizes at extrusiontemperature
7、s and is normally evacuated as it forms vapor.Pockets ofmoisture trapped in the pipe wall result from incomplete exsiccation of thecompound,and may reduce the physical properties of the pipe.NOTE2Minor residual stress in the pipe will not impair fieldperformance and handleability.High-residual stres
8、s has no proven effecton performance,but may impair handleability during installation.3.Apparatus3.1 Air Circulating Oven,thermostatically controlled,ca-pable of operating at 180 6 5C(356 6 9F)and capable ofmeeting the recovery requirement of 4.3.Additionally,theoven must have heat generation(power)
9、capacity such that therecovery achieved while at a constant oven set point.The airtemperature with the oven(that is,the test temperature)is to bemonitored within 3 in.from the outer edge of the testspecimen;make assurances that the temperature does notcontact the test specimen.NOTE3The oven should b
10、e vented to the outside of the building.NOTE4Monitoring of the test temperature within the oven mayrequire a secondary temperature monitoring device in addition to thetemperature monitoring device within the oven control system.4.Procedure4.1 Prepare specimens of pipe 150 mm(6 in.)long or longerwith
11、 ends cut square so that they stand perpendicular on endwhen placed in the oven.4.1.1 Cut staves from pipes whose size prevents insertion offull round specimens in the oven.Prepare large-diameter pipestaves so that their lengths parallel to the pipe axis are 150 mm(6 in.)or longer.4.2 Examine the sp
12、ecimens and note any unusual featuressuch as discoloration,inclusions,or pinholes in the cut edge.4.3 Place the specimens of whole pipe in the preheated ovenso that each specimen stands on end with sufficient separationbetween them so that hot air can flow freely between the pipes.Place specimens of
13、 pipe staves on the floor of the preheatedoven so that they rest on their longitudinal edges and so that hotair can flow freely around them.Record the time when the airin the oven directly adjacent to the test specimen recovers to180C(356F).Recovery must occur within 15 min or less.After an addition
14、al 30 min of exposure within the testtemperature tolerance of 180 6 5C,remove the specimens,taking care not to alter any heat effects.4.4 Examine the specimens within 3 min after removal fromthe oven,while still hot.With a sharp knife,cut whole pipespecimens lengthwise at approximately 60 circumfere
15、ntialintervals,resulting in six pipe staves of approximately equal1This practice is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.40 on TestMethods.Current edition approved Feb.15,2017.Published April 2017.Originallyapprove
16、d in 1987.Last previous edition approved in 2010 as F105710.DOI:10.1520/F1057-17.*A Summary of Changes section appears at the end of this standardCopyright 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 standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the
