ASTM G202-09 - 1.10.2009
 
Significance and Use

   The rotating cage (RC) test system is relatively inexpensive system that uses flat specimens to assess the effect of flow across a specimen on the corrosion that occurs on the specimen. This system does not produce an easily characterized flow system but it is adjustable over a wide range of flow rates and uses readily available specimens. (1-11).

   The RC method can be used to evaluate either corrosion inhibitors or materials or both. Guide G184 describes the procedure to use rotating cage to evaluate corrosion inhibitors.

In this test method, a general procedure is presented to obtain reproducible results using atmospheric pressure RC described in Guide G184 to simulate the effects of different types of coupon materials, inhibitor concentrations, oil, gas and solution compositions, and flow. Oil field fluids may often contain sand; however, this test method does not cover erosive effects that occur when sand is present.

 
1. Scope

1.1 This test method covers a generally accepted procedure to conduct the rotating cage (RC) experiment under atmospheric pressure.

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.3 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

D1293-18

Standard Test Methods for pH of Water

E691-23

Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

G1-03(2017)e1

Standard Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens (Includes all amendments and changes 12/8/2017).

G16-13(2019)

Standard Guide for Applying Statistics to Analysis of Corrosion Data

D1193-06(2018)

Standard Specification for Reagent Water

G46-21

Standard Guide for Examination and Evaluation of Pitting Corrosion

G170-06(2020)e1

Standard Guide for Evaluating and Qualifying Oilfield and Refinery Corrosion Inhibitors in the Laboratory (Includes all amendments and changes 12/10/2020).

G184-06(2020)e1

Standard Practice for Evaluating and Qualifying Oil Field and Refinery Corrosion Inhibitors Using Rotating Cage (Includes all amendments and changes 12/17/2020).

D1141-98(2021)

Standard Practice for Preparation of Substitute Ocean Water

G31-21

Standard Guide for Laboratory Immersion Corrosion Testing of Metals