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2、easurement procedure for corrosivity estimation of buried metal structure 1 . 2 . . ( ) . KS I ISO 11265：2005, NACE Standard RP-0502, Pipeline External Corrosion Direct Assessment Methodology 3 , . 3.1 (soil resistivity) . . . 3.2 4(4-pin method) 4 . 3.3 (soil box method) 4 , . 4 ( ) 4.1 . KS D 0290
3、:2009 2 . 4.2 , . 4.3 . 4.4 , . , a 50 % , ( ) . 4.5 . , . . 5 5.1 , , , (galvanometer), 4 , , (soil box) 5.2 (current source) , 97 Hz . DC . 5.3 (voltmeter), , 10 M . 5.4 , . 5.5 , . 5.6 , , (f ) . . 6 6.1 4 4 , . . 6.2 4 KS D 0290:2009 3 4 . . 7 7.1 4 , 4 . 7.2 3 . 2 5 . 7.3 . 8 8.1 4 8.1.1 4 1 ()
4、 ( ) . 1.58 m “R” 1 000 . 1 8.1.2 10 % . , . 8.1.3 . 8.1.4 . (Wheatstone Bridge) “R” a a a a KS D 0290:2009 4 . 8.1.5 , . 2 aR ：( ) a ： ()(cm) R ：P1 P2 ( ) 8.1.6 , , . . . 3 (a 1 , a 2 , a 3 ) (a 1 , a 2 , a 3 ) . 2 3 , . 3 R 3 , 2 R 2 , R 1 , R 2 , R 3 , . 1/R 1 1/R 11/R 2 1/R 1 1/R 21/R 3 1/R 1 1/
5、R 2 1/R 3 . R 1 R 1R 2 (R 1 R 2 )/(R 1 R 2 ) R 3 (R 2 R 3 )/(R 2 R 3 ) . 1 2 a 1 R 1 2 2 a 2 R 2 3 2 a 3 R 3KS D 0290:2009 5 2 , , 8.2 8.2.1 4 . . (, , ) . . 8.2.2 . . 8.2.3 . . 8.2.4 3 , “R” . 3 8.2.5 , , , a 1a 2a 3a 1a 2a 3R 1 R 2 R 3 1 2 3 R 1R 2R 3 1 2 3a 1a 2a 3a 1a 2a 3KS D 0290:2009 6 . 8.2.
6、6 . . 8.2.7 , , . 21 15.5 . R 15.5 R T (24.5T)/40 T ： () R T：T KS D 0290:2009 7 A () () 23 4 . A.1 3 m 3 m , R 10( ) . 2 aR2 3(m)10188.5( m) A.2 1 m ：R 1 70( ) 2 m ：R 2 30( ) 3 m ：R 3 10( ) 01 m ： R 1 R 1 70( ) 1 2 a 1 R 1 2 1(m)70439.8( m) 12 m ： R 2 (R 1 R 2 )/(R 1 R 2 ) (7030)/(7030)52.5( ) 2 2 a
7、 2 R 2 2 1(m)52.5329.9( m) 23 m ： R 3 (R 2 R 3 )/(R 2 R 3 ) (3010)/(3010)15( ) 3 2 a 3 R 3 2 1(m)1594.2( m) 153787 1 92 3(13) (02)26240114 (02)262401489 http:/ KS D 0290 :2009 KSKSKS SKSKS KSKS SKS KS SKS KSKS SKSKS KSKSKS Soil resistivity measurement procedure for corrosivity estimation of buried metal structure ICS 77.060 Korean Agency for Technology and Standards http:/www.kats.go.kr
