Research Article

A Bayesian Approach for Estimating the Thinning Corrosion Rate of Steel Heat Exchanger in Hydrodesulfurization Plants

Table 1

Generalized Extreme Value Distribution parameters after fitting wall thickness thinning rate data, number of observations, and value returned by K–S test from thirty-eight low alloy steel shell heat exchangers used in middle distillate units to preheat the feed with the effluent from the reactor.

Entry Location parameter (mm/year) Scale parameter (mm/year) Shape parameterNumber of observations value returned by K–S test

10.05840.04320.333380.67
20.04880.02920.287390.51
30.21120.13990.321380.32
40.16220.12130.124350.69
50.44680.2578−0.095330.34
60.29110.23110.136320.41
70.47060.2294−0.535400.22
80.47450.2408−0.028410.21
90.05360.04240.441370.40
100.22850.17810.168390.53
110.24650.17810.136380.47
120.38000.2697−0.129350.32
130.07580.06670.425340.78
140.25350.20320.262330.24
150.09990.07850.189310.54
160.07550.05370.246330.36
170.10080.07700.179400.12
180.04630.02730.131430.09
190.05120.03500.383370.18
200.22650.17880.158380.43
210.10940.07850.234380.58
220.11780.10180.226370.32
230.10460.13490.549400.18
240.23790.1529−0.013410.11
250.12370.11950.131330.72
260.43050.50930.243310.81
270.10140.10180.139400.11
280.22190.22950.410370.23
290.06580.05240.388350.69
300.12640.12710.345370.51
310.26930.04220.133380.43
320.31600.06250.184380.32
330.16710.07600.162320.28
340.16920.09940.062310.88
350.17400.05010.199400.11
360.13160.03460.386470.17
370.13010.02250.504310.91
380.06740.03190.341320.29