b'Table 12 Working Loads Under Weak Soil Conditions (Factor of Safety = 2)Recommended for Budgetary EstimatingUniform Soil ConditionShaft Size Organics Very Soft Clay Soft Clay Loose SandN 1 N = 1- 2 N = 2- 4 N = 2- 4PPB-300-EPS (2-7/8 dia.) 19,000 lb 22,000 lb 31,000 lb 26,000 lbPPB-300-EPS + PPB-300-IS 23,000 lb 27,000 lb 39,000 lb 32,000 lbPPB-350-EPS (3-1/2 dia.) 26,000 lb 30,000 lb 43,000 lb 35,000 lbPPB-400-EPS (4 dia.) 34,000 lb 40,000 lb 57,000 lb 46,000 lbPPB-350-EPS + PPB-350-IS 36,000 lb 42,000 lb 59,000 lb 48,000 lbPPB-350-EPS + PPB-350-ES 50,000 lb 58,000 lb 82,000 lb 67,000 lbPPB-350-EPS + PPB-350-ES + PPB-350-IS 56,000 lb 66,000 lb 93,000 lb 76,000 lbEPS = Pier Pipe SectionIS = Internal Inertia SleeveES = 4 External SleeveAllowableCompressiveLoads - Maximum Allowable Compressive Load onPinAir: Graph 5showsthe Steel Piers Without Soil Supportreductioninallowableaxial (Piers Must Be Grout Filled)compressive loading where the piershaft has no lateral support. 1003-1/2"+ 4" SB + I.S.Table 13illustrates demonstrates 3-1/2" + 4" SBhow the ECP PPB-400-EPS (4 inch 4"- 0.237"90 3-1/2" + ISdiameter) pier pipe provides an axial 3-1/2"- 0.165"stiffnessofmorethan 3-1/2times 2-7/8"+ ISthat of a PPB-300-EPS (2-7/8 inch 2-7/8"- 0.165"diameter) pierpipe.Inaddition, 80Maximum Allowable Load - lb x 1,000Graph 5 demonstrates that the PPB-400-EPS pier pipe has a maximum 70compressiveload capacityofmorethan threetimesthatofthePPB-300-EPSpier pipewheneachhas 60tenfeetofexposedcolumnheightwithout any lateral support.50Whenever weak soil is encounteredsuch as peat or other organic soils,improperlyconsolidatedsoil,or a 40situation where a portion of the piershaftmaybecomefullyexposed;30consideration MUST be given to thereduction in capacity that is broughtonbylackofsufficientlateralsupport to the pier pipe. 20In situationswhereinsufficient Earth Contact Productslateral pier pipe support is provided 10bythesoil,thepier isnotableto 0 4 6 8 10 12 14 16support the full rated capacity. The Unsupported Column Height - ftlengthofpierpipe thatispassing Graph 5. Maximum Unfactored Load* on piers with NO soil supportthrough the weak soil and the amount * Caution: When selecting a pier configuration for a specificof stiffness provided by the pier pipe application, ONE MUST APPLY A FACTOR OF SAFETYwill affect the load capacity reduction TO THE CAPACITIES SHOWN ON GRAPH 5 to insurethat must be considered. Safe Use design.ECP Steel Piers - Technical Design Manual2021 Earth Contact Products, L.L.C.2021-09 Chapter 6 - Page 127 All rights reserved'