1、Designation: F 689 97 (Reapproved 2004)An American National StandardStandard Practice forDetermination of the Temperature of Above-Ground PlasticGas Pressure Pipe Within Metallic Casings1This standard is issued under the fixed designation F 689; the number immediately following the designation indic
2、ates the year oforiginal 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 describes a procedure for th
3、e 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 This standard does not purport to address all of thesafety concerns, if any, associated with
4、 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:2D 2513 Specification for Thermoplastic Gas Pressure Pipe,Tubing, and
5、 FittingsE 220 Method for Calibration of Thermocouples by Com-parison 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 ano
6、deless 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.3.1.2 plastic gas pipean approved gas carrier th
7、at com-plies with Specification D 2513.4. 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 d
8、esign 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 Ch
9、art 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 t
10、hermocouple 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
11、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 thermocouplewiring shall follow the
12、 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 E 220.1This practice is under the jurisdiction of ASTM Committee F17 on PlasticPip
13、ing Systems and is the direct responsibility of Subcommittee F17.60 on Gas.Current edition approved Nov. 1, 2004. Published November 2004. Originallyapproved in 1980. Last previous edition approved in 1997 as F 689 97.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact AS
14、TM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from the Plastic Pipe Institute, 1825 Connecticut Ave. NW, Suite 680,Washington DC, 10017.1Copyright ASTM International, 100 Barr Ha
15、rbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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
16、. 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 b
17、e providedextending from the reflective panel at least 1 ft (300 mm)beyond the test specimen (see Fig. 2). Connect specimenthermocouples to the continuous chart recorder.7.3 Install the ambient thermocouple apparatus in accor-dance with Fig. 1 within the immediate vicinity of thespecimen and connect
18、 it to the continuous chart recorder. Anoptional fifth thermocouple may be installed 12 in. belowgrade.7.4 Install the solar load panel in the immediate vicinity ofthe specimen facing due south, and inclined at an angle withthe horizontal equal to local latitude. The panel shall be locatedso that it
19、 will receive maximum direct sunlight. Connect thesolar load thermocouple to the continuous chart recorder.7.5 Monitor riser temperatures and compare these data withdaily ambient and solar load readings. These temperaturecomparisons will yield a relationship of solar radiation, cloudcover, thermal i
20、nduction, and other parameters. These data canthen be compared with data obtained at other geographiclocations.7.6 Record any abnormal test conditions.7.7 The measurements should be taken during the warmestmonths of the year as determined from local meteorologicalrecords (for example, month with the
21、 highest ambient tempera-ture and least amount of cloud cover).7.8 The test data should be compared with the historicalrecords for the ambient temperature and cloud cover to ensurethat the test period was typical for both average ambienttemperature and hours of sunshine.FIG. 1 Weather StationF 689 9
22、7 (2004)2ASTM 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 any such patent rights, and the riskof infringement of such ri
23、ghts, 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, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additiona
24、l standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the AST
25、M 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).FIG. 2 Self-Centering Riser SI EquivalentsF 689 97 (2004)3
