b'Design Example 2ACorrosion Life of ECP Steel Pier PipeQuick and Rough MethodAll of the structural and soil data was given in CL P= CL pH=5 - CL pH=5.0 to 5.5Design Example 2 above. CL P= 35 years3.3 years = 31.7 yearsEstimated Corrosion Life of the PPB-350-EPS Life PPB-350-EPS = 30 years*Pipe: The estimated average corrosion life for (See important notes bottom 166.)the pier pipe installed in fill soil with resistivityof 700 ohm-cm and pH = 5.5 can be estimated BONUSALTERNATE PRODUCT:from Table 6 in two steps. 1A. Corrosion LifeEstimate -PPB-400-EPS1.Estimated Life - PPB-350-EPS Pier Pipe at Pier Pipe at pH = 5 and 700 -cm: Using thepH = 5 and 700 -cm: Notice in Table 6 the columnforthe PPB-400-EPS inTable6,thecorrosion life at 500 ohm-cm is 33 years and the Quick -Solve design estimatedcorrosionlifecorrosionlifeincreasesto 38yearswhenthe for the Model 400-EPS pier pipe at pH = 5 andresistivity rises to 1,000 ohm-cm.The 700 ohm- 500ohm-cmis 72years.Thedifferenceincm resistivity at this site is approximately 2/5 of corrosion life between resistivity 500 and 1,000the difference between the two values given in ohm-cm is found to be 12 years.ConsideringTable 6, 1,000 -cm = 38 years and 500 -cm = that 700 ohm-cm is 2/5 of the distance between33 years. 500 and 1,000 ohm-cm,Estimate the corrosion at 700 -cm as 2/5 times CL pH=5.5 = 72 yr + (2/5 x 12) yrs = 76.8 years**the difference of 5 years. 2A. Estimated Life - PPB-400-EPS Pier PipeCL pH=5.0= 33 years + [2/5 x (38 - 33 years)] atpH=5.5and700-cm: AnadjustmentCL pH=5.0= 33 years + 2 years = 35 years must also be made to account for the actual pH =2.Estimated Life - PPB-350 Pier at pH = 5.5 5.5 instead of result at pH = 5 above.There sixand700-cm: Anadjustmentmustalsobe increments of 0.5 pH between pH = 5 and pH =made to adjust to the actual pH = 5.5. (We found 8.The reduction in corrosion life due to a higherpH=5showninthetables)Therearesix pH of 5.5 is determined below:increments of 0.5 pH between pH = 5 and pH = CL pH=5.0 to 5.5= [72 yr (pH=5) - 44yr (pH=8)] / 68.The ballparkestimateforreductionin CL pH=5.0 to 5.5 = 4.7 years (Life decrease)corrosion life due to the higher pH (5.5) at the BycombiningSteps1Aand2A,theroughsite can be roughly estimated as follows: estimated corrosion life is determined:CL pH=5.0 to 5.5= [33 yr (pH=5) -13 yr (pH=8)] / 6 CL P= CL pH=5.0 - CL pH=5.0 to 5.5CL pH=5.0 to 5.5= 3.3 years (Life reduction) CL P= 76.8 years4.7 years = 71.1 yearsBy combining Step 1 and 2, the Quick -Solve Use Life PPB-400 EPS = 40+ years**corrosion life is determined: (See important notes bottom page 166.)TABLE 6. Sample ECP Steel Pier Pipe Life Expectancy Estimates At Full LoadPPB-300-EPS PPB-350-EPS PPB-400EPSB PPB- 400-EPSSoil pH 2-7/8 Dia. Tube 3-1/2 Dia. Tube 4 Dia. Tube 4 Dia. TubeHS-coating (0.32 Mils) HS-coating (0.32 Mils) (Plain Steel) (HDG2.3 oz/ft 2)Soil Resistivity500 ohm-cm4.57 yrs7 yrs 12 yrs 21 yrs5 33 yrs 33 yrs 2 63 yrs 72 yrs 2A813 yrs13 yrs . 19 yrs 28 yrs .10.5 7 yrs 7- yrs 12 yrs 21 yrs1 1ASoil Resistivity1,000 ohm-cm.4.5 8 yrs 8 yrs 13 yrs 24 yrs5 38 yrs 38 yrs 73 yrs 84 yrs8 13 yrs 13 yrs 22 yrs 33 yrs10.5 8 yrs 8 yrs 13 yrs 24 yrsECP Technical Design ManualCorrosion Life Design Examples2021 Earth Contact Products, L.L.C.4.5 22 yrs 22 yrs 10 yrs 39 yrs2021-09 Chapter 9Page 165 All rights reserved5 69 yrs 69 yrs 72 yrs 100 yrs8 27 yrs 27 yrs 17 yrs 45 yrs10.5 22 yrs 22 yrs 10 yrs 39 yrs'