b"Using Equation 2, the corrosion life for the steelpier pipe can now be determined:CORROSION POTENTIAL ESTIMATING GRAPHUNDERGROUND BARE STEEL STRUCTURESCL P= W S-10% / K C Where: CORROSIONCLP = Life expectancy of steel tube (years) 100,000POTENTIALW S= 10.7 oz/ft 2(Weight loss of steel pier) 70,000 UNLIKELYK C= 0.45 oz/ft 2(Corrosion loss per year.) 50,000ALL pH'sCL P= 10.8/ 0.45 = 24 years4.Determinethecorrosionlifeofthepier: 20,000 3 pH 6 SLIGHTThecorrosionlife consistsofthelifeofthegalvanization and the loss of ten percent of the 10,000wall thickness of the steel pipe.When installed 7000 MILDatthisjobsite,theaveragecorrosionlife 5000RESISTIVITY (ohm-cm)expectancy of the ECP PPB-350-EPS pier pipe: MODERATE Life = CL G+ CL P= 1.9 + 24 = 25.9 years 2000Baseduponthedataand ourassumptions,theresultofthisanalysissuggeststhattheECP 1000700PPB-350-EPS SteelPierspecifiedforthis 500project will support the design load plus a factor SEVEREof safety of 2.0 with no loss in capacity for an 200 pH 4.5estimated average corrosion life of 26 years. pH 12 pH 10.5100Use Corrosion Life = 25 years7050pH = 5 pH = 6 pH = 7 pH = 8 pH = 9 pH = 10BONUS: Suggest an Alternate Product to the 00.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 2.5customer for longer corrosion life LOSS IN WEIGHT BY CORROSION PER YEAR (oz./sq. ft.)It is always to the advantage of the installer to Graph 3.offeradifferentproductifhethinksitwillbenefittheclientorengineer.Thealternate EstimatedLife SteelLoss: PPB-400-EPSproduct may or may not be accepted, but it does pipe:give the engineer another option to select another Theamountofsteellossequalto10%oftheproduct that offers a longer corrosion life. 0.220 inch wall thickness of the 4 inch diameterThe PPB-400-EPS Pier is a hot dip galvanized pierpipe isdeterminedasfollowsusingpierpipethatcanbeusedwiththesame Equation 2 - Corrosion Life Steel Shaft:foundationbracket.Thethicker HDG zinc CL P= W S-10% / K C .coatingalongwiththelargerdiameterand W S-10%= 0.10 x [0.220/12] x 489.6 x 16thickerwallpierpipecanofferasignificant W S-10%= 14.4 oz/ft 2increase in corrosion life with only a small added Equation 2 - Corrosion Life of Steel Shaft:cost to the project as the labor will be identical. CL P= W S-10% / K CEstimated Life Galvanize Loss: PPB-400- Where: W S-10% = 14.4 oz/ft 2(PPB-400-EPS 10% loss)EPS pipe: K C= 0.45 oz/ft 2(Corrosion loss per year.)Equation 1 - Corrosion Life Zinc: CL P = 14.4/ 0.45 = 32 yearsCL G= G / [0.25 - 0.12 log 10(R/150)] Determine the corrosion life of the PPB-400- Where: 2 EPSpierpipe. Thetimetoexhaust theG = 1.7 oz/ft (HDGASTM A123 Gr. 75) galvanization and for ten percent loss of the steelDetermine CL Gusing Equation 1: from the pipe wall is the average corrosion lifeCL G = 1.7 / [0.25 - 0.12 log 10(700/150)] expectancyofthisalternatesteelpiersystem= 1.7 / [0.250.12 (0.669)] = 2.3 / 0.170 when installed at this job site.CL G= 10 yearsLife = CL G+ CL P= 10 + 32 = 42 yrsUse Corrosion Life = 40+ years**(See important notes bottom page 166.)ECP Technical Design ManualCorrosion Life Design Examples2021 Earth Contact Products, L.L.C.2021-09 Chapter 9Page 164 All rights reserved"