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    ASTM G208-12

    Historical Standard: Стандартное практическое руководство по оценке и определению соответствия требованиям ингибиторов коррозии для нефтепромыслового и нефтеперерабатывающего оборудования с использованием аппарата для испытания ударной струей

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    Significance and Use

    5.1 Selection of corrosion inhibitor for oilfield and refinery applications involves qualification of corrosion inhibitors in the laboratory (see Guide G170). Field conditions should be simulated in the laboratory in a fast and cost-effective manner.

    5.2 Oilfield and refinery corrosion inhibitors should provide protection over a range of flow conditions from stagnant to that found during typical production conditions. The inhibitors are not equally effective over all flow conditions, so it is important to determine the flow conditions in which they are effective.

    5.3 Severity of hydrodynamic conditions depends on the type of laboratory methodology. Typically, rotating cylinder electrode is effective up to 20 Pa of wall shear stress, rotating cage (RC) is effective between 20 and 200 Pa of wall shear stress, and jet impingement (JI) is effective at wall shear stress above 200 Pa (1)3 of wall shear stress.

    5.4 The JI test system is relatively inexpensive and uses simple flat specimens.

    5.5 In this practice, a general procedure is presented to obtain reproducible results using JI simulating the effects of different types of coupon materials; inhibitor concentrations; oil, gas, and brine compositions; temperature; pressure; and flow. Erosive effects predominate when the flow rate is very high (typically above 500 Pa) or when sand or solid particles are present; however, this practice does not cover the erosive effects.

    1. Область применения

    1.1 Настоящеe практическое руководство охватывает общепринятую лабораторную процедуру с использованием аппарата для испытания ударной струей (JI) для оценки ингибиторов коррозии для нефтепромыслового и нефтеперерабатывающего оборудования.

    1.2 Значения, указанные в единицах СИ, должнырассматриваться в качестве стандартных. Никакие другие единицы измерения не включены в настоящий стандарт.

    1.3 Настоящий стандарт не ставит целью описание всех проблем безопасности, если они имеются, связанных с его использованием. На пользователе настоящего стандарта лежит ответственность за определение надлежащих методов техники безопасности и охраны труда, а также определение применимости нормативных ограничений перед его использованием.

    2. Ссылочные документы

    D1141 Practice for the Preparation of Substitute Ocean Water

    D1193 Specification for Reagent Water

    D4410 Terminology for Fluvial Sediment

    G1 Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens

    G102 Practice for Calculation of Corrosion Rates and Related Information from Electrochemical Measurements

    G106 Practice for Verification of Algorithm and Equipment for Electrochemical Impedance Measurements

    G111 Guide for Corrosion Tests in High Temperature or High Pressure Environment, or Both

    G16 Guide for Applying Statistics to Analysis of Corrosion Data

    G170 Guide for Evaluating and Qualifying Oilfield and Refinery Corrosion Inhibitors in the Laboratory

    G184 Practice for Evaluating and Qualifying Oil Field and Refinery Corrosion Inhibitors Using Rotating Cage

    G185 Practice for Evaluating and Qualifying Oil Field and Refinery Corrosion Inhibitors Using the Rotating Cylinder Electrode

    G193 Terminology and Acronyms Relating to Corrosion

    G31 Guide for Laboratory Immersion Corrosion Testing of Metals

    G46 Guide for Examination and Evaluation of Pitting Corrosion

    G5 Reference Test Method for Making Potentiodynamic Anodic Polarization Measurements

    G59 Test Method for Conducting Potentiodynamic Polarization Resistance Measurements

    G96 Guide for Online Monitoring of Corrosion in Plant Equipment (Electrical and Electrochemical Methods)