ASTM G9-2007(2013)e1 Standard Test Method for Water Penetration into Pipeline Coatings《管道涂层渗水性的标准试验方法》.pdf
《ASTM G9-2007(2013)e1 Standard Test Method for Water Penetration into Pipeline Coatings《管道涂层渗水性的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM G9-2007(2013)e1 Standard Test Method for Water Penetration into Pipeline Coatings《管道涂层渗水性的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: G9 07 (Reapproved 2013)1Standard Test Method forWater Penetration into Pipeline Coatings1This standard is issued under the fixed designation G9; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revision
2、. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.1NOTEEditorial corrections were made throughout in June 2013.1. Scope1.1 This method covers the determination of the apparentrate of depth of w
3、ater penetration into insulating coatingsapplied to pipe.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theres
4、ponsibility 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:2G12 Test Method for Nondestructive Measurement of FilmThickness of Pipeline Coatings on St
5、eel3. Summary of Test Method3.1 The method consists of an immersion-type test wherepipe specimens are suspended in an aqueous electrolyte for theduration of the test period. Electrical measurements of coatingcapacitance and dissipation factor are used to follow the waterabsorption rate of the test m
6、aterials.4. Significance and Use4.1 The deterioration of an insulating coating film is inti-mately related to its moisture content. The water penetrationtest provides a means for monitoring the passage of moisturethrough a coating material by means of changes in its dielectricconstant. When expresse
7、d in relation to time, the test data willreflect a rate of deterioration which is a characteristic of thecoating material and will bear a relation to its expected usefullife as an insulating coating. The test for water penetration willalso provide information that is useful in establishing theoptimu
8、m coating thickness for a given material.5. Apparatus5.1 Immersion CellAny suitable nonmetallic vessel tocontain the test specimens. Dimensions of the vessel shallpermit the following requirements:5.1.1 Test specimens shall be suspended vertically with atleast 25 mm (1.0 in.) clearance from the side
9、s and bottom.5.1.2 Test specimens shall be separated by not less than 25to 40 mm (1 to 1.5 in.) and a vertically suspended anode shallbe placed at an equal distance from each specimen not less thanthe separation of distance.5.1.3 The test vessel shall be deep enough to allow forimmersion of the samp
10、les in the electrolyte to the levelspecified in 8.1.NOTE 1Commercially available, glass battery jars in 2-L (0.55-gal)and 10-L (2.7-gal) sizes can be conveniently used with 19-mm (0.75-in.)and 51-mm (2.0-in. nominal) diameter specimens, respectively.5.1.4 A suitable sample support plate fabricated f
11、rom amaterial having a low dielectric constant shall be used tosuspend the samples and anode above the immersion cell. Thesupport plate shall contain an access hole for the referenceelectrode. A typical test cell is illustrated in Fig. 1.5.2 Electrolyte, consisting of tap water with the addition of1
12、 weight % of each of the following technical-grade anhydroussalts: sodium chloride, sodium sulfate, and sodium carbonate.NOTE 2Add 10 g of each for each litre (0.26 gal) of water.5.2.1 The electrolyte in the immersion cell shall be main-tained at the proper level by regular additions of tap water. T
13、heelectrolyte shall not be reused after completion of the test.5.3 Voltage SourceA direct current power supply, capableof supplying low ripple voltage shall be used to maintain apotential difference of 6.0 6 0.1 V dc between each of the testspecimens and a common electrode.5.4 ConnectorsWiring conne
14、ctions from the anode to thespecimen shall be of No. 18 AWG insulated copper. Attach-ment to the anode shall be sealed and kept above the level of1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibili
15、ty ofSubcommittee D01.48 on Durability of Pipeline Coating and Linings.Current edition approved June 1, 2013. Published July 2013. Originally approvedin 1969. Last previous edition approved in 2007 as G9 07. DOI: 10.1520/G0009-07R13E01.2For referenced ASTM standards, visit the ASTM website, www.astm
16、.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.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1the electro
17、lyte. Attachment to the specimen shall be made by amethod that will allow disconnection from the anode when themeasuring bridge is in use. A convenient means for accom-plishing this is through the use of insulated pin-type jacks.5.5 Capacitance BridgeMeasurements of equivalentspecimen capacitance an
18、d coating dissipation factor shall bemade with a low-voltage a-c, resistive-ratio-arm type measur-ing bridge having the following characteristics:5.5.1 Oscillator frequency, 1 kHz 6 2%,5.5.2 Series capacitance range, 1 to 1100 pF 6 1%,5.5.3 Series capacitance sensitivity, 0.5 pF,5.5.4 Dissipation fa
19、ctor range, 0.001 to 1.0 at 1 kHz, and5.5.5 Dissipation factor sensitivity, 0.001 at 1 kHz.5.6 Measuring CircuitMeasurements of specimen capaci-tance and coating dissipation factor shall be made using acircuit that places the sample unknown in series with thecomparison circuit of the measuring bridg
20、e. Connection of theunknown to the measuring bridge shall be made in such amanner as to eliminate the introduction of stray capacitanceinto the measuring circuit. A diagram for connecting the testcell to the bridge is shown in Fig. 2. In this arrangement, boththe test leads are shielded and the chas
21、sis of the bridge isgrounded. The immersion cell shall also be shielded to avoidcapacitance effects from surrounding objects.NOTE 3A shield for the test cell can conveniently be fabricated frommost commercially-available tin or aluminum foils of approximately0.0382-mm (0.0015-in.) thickness and form
22、ed around the container.5.7 Thickness GageMeasurements of coating thicknesswill be required for this test. Any instrument suitable for usewith Test Method G12 can be used.5.8 Anode, fabricated from 4.76-mm (0.1875-in.) diameterAISI Type 303 stainless-steel rod, and shall be 178 mm (7.00in.) long, wi
23、th the upper 50 mm (2.00 in.) threaded to accept alocking nut.6. Test Specimen6.1 The test specimen shall be a representative piece ofproduction-coated pipe and shall be free of obvious coatingflaws or defects (see Fig. 3). Any suitable diameter andspecimen length can be used. Physical limitations o
24、f theimmersion cells suggested in 5.1.3, Note 1, make it necessaryto restrict the overall sample length to approximately 300 mm(12.0 in.) for both the 19-mm (0.75-in. nominal) and 51-mm(2.0-in. nominal) diameter coated pipe specimens.6.2 The upper and lower ends of the test specimen shall beplugged
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
最后一页预览完了!喜欢就下载吧,查找使用更方便
5000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMG920072013E1STANDARDTESTMETHODFORWATERPENETRATIONINTOPIPELINECOATINGS 管道 涂层 渗水 标准 试验 方法 PDF

链接地址:http://www.mydoc123.com/p-540739.html