Corrosivity index

Test method for corrosivity index of plastics and fillers... 

Other indices proposed that have tried to overcome the basic limitations of LSI include the Stiff and Davies Saturation Index, Larson and Buswell Index, Puckorius (Practical) Scale Index, Oddo-Tomson Index, and Larson-Skold Corrosivity Index, some of which are discussed briefly here. 

Generation of chloramines requires the same equipment as chlorination (gaseous or aqueous hypochloramination), plus equipment for adding ammonia (gaseous or aqueous). The information for calculating the corrosion indexes for final corrosion control and for determining the CT values for secondary chloramination process control can be found in Appendix A and Appendixes D-E, respectively. 

D. R. Woods, Data for Process Design and Engineering Practice. Englewood Cliffs, NJ Prentice Hall, 1994. Gives order of magnitude values of properties for more than 1200 compounds and a guide to sources for more accurate data. This includes the PDEP Corrosion Index referred to in Table 13.16. 

The fire property associated with corrosion damage is defined as corrosion index (Cl), which is the corrosion rate per unit mass concentration of the products [(A/min)/(g of polymer gasified products/m of air flow)] [2,3] ... 

CCI Crevice corrosion index GTAW Gas tungsten arc welding... 

A Corrosion Index for Pipeline Risk Evaluation The third example of top down models is the pipeline risk assessment methodology that is described in much detail in the 2nd edition of a popular book on pipeline risk management [20]. Since this book was published, many systems... 

Third damag party Index Corrosion Index i i Dei 1 Inc Ign lex Incorrect 1 operatlone 1 Index... 

ACIS5 Atmospheric Corrosion Index MCI Marine Corrosion Index ... 

The rod assemblies are usually exposed to the environment in question for 90 days, after which the wires are removed, cleaned, and reweighed. The percentage mass loss of the aluminum is the corrosion index for that time period. The data obtained can then be used to describe the severity of the atmosphere by comparing the values obtained to those empirically determined by exp>erience or by relevant testing. Environmental corrosivity is classified from negligible to very severe on this basis. Some typical atmosphere assessments made using this procedure are shown in Table 2. It has been found that a series of exposures must be made to fully characterize an environment, as the corrosion varies with the season of the year and the exposure is only for three months. 

Figure 9.30 Average corrosion index for the copper rods exposed on the rooftop and the average wind speed recorded at the local weather station as a function of the 16 points of the compass.

As a results of the rapid increase in the fire model there is a great demand for the fire property and specialized test methods. New test methods have been developed such as [36] cone calorimeter, heat release measurements, etc. With these methods, the following fire properties have been measured for PO critical heat flux, thermal response parameter surface radiation loss, heat of gasification, flame heat flux limit, yield of products, heat of combustion, corrosion index, flame extinction index, fire propagation index, etc. [37]. 

Procedure and limitations. The ISO corrosivity classification from atmospheric parameters is based on the simplifying assumption that the time of wetness (TOW) and the levels of corrosive impurities determine the corrosivity. Only two types of corrosive impurities are considered, namely, sulfur dioxide and chloride. Practical definitions for all the variables involved in calculating an ISO corrosivity index follow. 

A corrosion index for pipeline risk evaluation. A risk assessment technique is described in much detail in the second edition of a popular book on pipeline risk management. The technique proposed in that book is based on subjective risk assessment, a method that is particularly well adapted to situations in which knowledge is perceived to be incomplete and judgment is often based on opinion, experience, intuition, and other nonquantifiable resources. A detailed schema relating an extensive description of all the elements involved in creating risk compensates for the fuzziness associated with the manipulation of nonquantifiable data. Figure 4.12 illustrates the basic pipeline risk assessment model or tool proposed in that book. 

The potential for pipeline failure caused either directly or indirectly by corrosion is probably the most common hazard associated with steel pipelines. The corrosion index was organized in three categories to reflect three types of environment to which pipelines are exposed, i.e., atmospheric corrosion, soil corrosion, and internal corrosion. Table 4.3 contains the elements contributing to each type of environment and the suggested weighting factors. 

The corrosion resistance of ferritic steels has been extensively studied. The following expressions summarize the effects of different alloying elements on the resistance of ferritic steels exposed to boiling corrosive solutions during slow strain tests. The stress corrosion indices (SCls) in each environment integrate the beneficial (-) or deleterious (-I-) effect of the alloying elements (in %) when the steels are in contact with such a caustic environment. In boiling 4M NaNOa at pH 2 the stress corrosion index is... 

It should be emphasised that pollution and corrosion are not necessarily related, at least in the case of aluminium. A global evaluation of the pollution does not yield a corrosivity index of water. One must know the nature and the concentration of the pollutants to predict the corrosion resistance of aluminium in polluted water. A given water is, therefore, characterised by the quantity per unit volume of the contained products making up its composition. However, other physical and physicochemical parameters can have an important influence on the corrosion rate of a metal temperature, electric conductivity, and pH. 

Cost of Corrosion. The Institute of Materials, Minerals and Mining, http //www.iom3. org/divisions/surface/corrosion/index.htm. Last accessed ... 

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