ASTM_F_689_-_97_2011.pdf

Designation:F68997(Reapproved 2011)Standard Practice forDetermination of the Temperature of Above-Ground PlasticGas Pressure Pipe Within Metallic Casings1This standard is issued under the fixed designation F689;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice describes a procedure for the determina-tion of the temperature history of above-ground plastic gaspressure pipe encased in a metallic casing.Such temperaturechanges may be due to ambient air temperature,or solarexposure,or both.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D2513 Specification for Polyethylene(PE)Gas PressurePipe,Tubing,and FittingsE220 Test Method for Calibration of Thermocouples ByComparison Techniques2.2 Other Document:Thermoplastic Fuel Gas Piping/Investigation of MaximumTemperatures Attained by Plastic Pipe Inside Metal Ser-vice Risers,TR 30,Plastic Pipe Institute,May 197833.Terminology3.1 Definitions:3.1.1 anodeless riserA type of transition fitting that isdesigned to transport gas from an underground polyethyleneservice line to above-ground steel piping.In an anodeless riserpolyethylene pipe is always the gas carrier,at least,in thebelow ground section.3.1.2plastic gas pipean approved gas carrier that com-plies with Specification D2513.4.Significance and Use4.1 This practice provides a procedure for determining thetemperature history of plastic gas pressure pipe encased inmetallic casings.4.2 The data obtained are indicative of the temperatureattainable within a service riser of a specific design and size ina given geographical location under the climatogical conditionsin existence during the test period.4.3 The data obtained can be used within the constraints of4.2 to design the maximum allowable operating pressurespermitted by existing codes.5.Apparatus5.1 Four-Channel Continuous Chart Thermocouple Re-corder.5.2 Thermocouple Probes.5.3 Solar Load Panel,12 by 20 by 0.032 in.(300 by 500 by0.8 mm),steel,painted flat black with an insulated thermo-couple attached to the underside.5.4 Ambient Thermocouple Apparatus,consisting of a well-ventilated,shaded housing containing a thermocouple formonitoring ambient air temperature(see Fig.1).6.Test Specimens6.1 The riser may be either preassembled or fabricated inaccordance with written procedures.6.2 The outlet from the specimen defined by 6.1 shall becapped to simulate no-flow(stagnant)conditions.6.3 The riser shall be fitted with a bare junction type“J”or“K”thermocouple probe 2030 AWG that shall be installed 3in.below the internal transition on the polyethylene pipe.Theprobe tip shall be embedded into the outer surface of thepolyethylene pipe by using a soldering iron.The thermocouple1This practice is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.60 on Gas.Current edition approved Feb.1,2011.Published March 2011.Originallyapproved in 1980.Last previous edition approved in 2004 as F689 97(2004).DOI:10.1520/F0689-97R11.2For 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 Summary page onthe ASTM website.3Available from Plastics Pipe Institute(PPI),105 Decker Court,Suite 825,Irving,TX 75062,http:/www.plasticpipe.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 wiring shall follow the piping and exit out the horizontalportion of the riser(see Fig.2).6.4 At least two specimens shall be used at each test site.7.Procedure7.1 Calibrate all thermocouple recorder combinations inaccordance with Method E220.7.2 Install the riser so that the bare thermocouple probelocation is 6 6 1 in.(150 m 6 25 mm)above grade and facingsouth.Install a vertical reflective panel 8 6 1 in.(200 6 25mm)due north of the specimens,facing due south.Thereflective panel shall be at least 1 ft(300 mm)higher than theexposed height of the specimens and shall extend at least 1 ft(300 mm)beyond the center line of the test specimen in eachhorizontal direction.The panel shall have a matte-whitesurface.A bed of light-colored crushed stone shall be providedextending from the reflective panel at least 1