ASTM G158 - 98(2010)

    Standard Guide for Three Methods of Assessing Buried Steel Tanks

    Active Standard ASTM G158 | Developed by Subcommittee: G01.10

    Book of Standards Volume: 03.02


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    Significance and Use

    This guide provides three methods for determining the suitability of a buried steel tank to be upgraded with cathodic protection.

    This guide may be used to assess any UST, including non-regulated USTs.

    This guide provides three alternative methods but does not recommend any specific method or application. The responsibility for selection of a method rests with the user.

    This guide has specific requirements for vendor provided information which should be requested and reviewed by the user.

    1. Scope

    1.1 This guide covers procedures to be implemented prior to the application of cathodic protection for evaluating the suitability of a tank for upgrading by cathodic protection alone.

    1.2 Three procedures are described and identified as Methods A, B, and C.

    1.2.1 Method ANoninvasive with primary emphasis on statistical and electrochemical analysis of external site environment corrosion data.

    1.2.2 Method BInvasive ultrasonic thickness testing with external corrosion evaluation.

    1.2.3 Method CInvasive permanently recorded visual inspection and evaluation including external corrosion assessment.

    1.3 This guide presents the methodology and the procedures utilizing site and tank specific data for determining a tank's condition and the suitability for such tanks to be upgraded with cathodic protection.

    1.4 The tank's condition shall be assessed using Method A, B, or C. Prior to assessing the tank, a preliminary site survey shall be performed pursuant to Section 8 and the tank shall be tightness tested pursuant to 5.2 to establish that the tank is not leaking.

    1.5 While this guide provides minimum procedures for assessing a tank's condition, this guide does not provide minimum installation procedures or requirements for upgrades of the tank by cathodic protection.

    1.6 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

    1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D2216 Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass

    E114 Practice for Ultrasonic Pulse-Echo Straight-Beam Contact Testing

    E797 Practice for Measuring Thickness by Manual Ultrasonic Pulse-Echo Contact Method

    E1323 Guide for Evaluating Laboratory Measurement Practices and the Statistical Analysis of the Resulting Data

    E1526 Practice for Evaluating the Performance of Release Detection Systems for Underground Storage Tank Systems

    G51 Test Method for Measuring pH of Soil for Use in Corrosion Testing

    G57 Test Method for Field Measurement of Soil Resistivity Using the Wenner Four-Electrode Method

    ASNT Standard

    ASNTSNT-TC-1A Personnel Qualification and Certification in Nondestructive Testing

    NACE International Standards

    RP-0285 Standard Recommended Practice-Corrosion Control of Underground Storage Tank Systems by Cathodic Protection


    ICS Code

    ICS Number Code 77.060 (Corrosion of metals); 77.140.99 (Other iron and steel products)

    UNSPSC Code

    UNSPSC Code 11101704(Steel)


    DOI: 10.1520/G0158-98R10

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