SU0003122 - Laserfiche WebLink

Home Browse Search

STRUCTURAL ANALYSIS OF BIO-PURE VESSELS A vessel wall stress analysis was `developed by Werner B. Storch and Associates, Inc., Consulting Structural Engineers of Portland, Oregon. This analysis investigated stresses imposed upon the aeration chamber, clarifier, and chlorine contact chamber under the following conditions: A. Aeration chamber full of liquid, installed on concrete foundation slab above ground level. B. Aeration chamber empty, installed on concrete foundation slab 5`0" below ground level. C. Clarifier full of liquid with aeration chamber. empty. D. Clarifier empty with aeration chamber full of liquid. E. Chlorine contact chamber full of liquid with aeration chamber empty. F. Chlorine contact chamber empty with aeration chamber full of liquid. The structural analysis of the standard 50E 5,000-gpd system vessels yields the following data: i A. Maximum flexural stress for the aeration chamber walls, under condition A above, is 20,962 psi. Strength of material is 41,800 psi in flexure; therefore, the safety factor is approximately 2:1. B. Maximum flexural stress of the aeration chamber walls, under condition B above, is less than 25% of the stress encountered in condition A. Therefore, the safety factor is approximately 8:1. C. Maximum tensile stress of the clarifier walls, under condition C above, is 348 psi. Strength of material is 15,000 psi in compression. Therefore, the safety factor is 43:1. D. Maximum compressive stress of the clarifier walls, lander condition D above, is 328 psi. Strength of material is 15,000 psi in compression. Therefore, the safety factor is 45:1. E. The chlorine contact chamber is smaller than the clarifier. Therefore, maximum tensile stress is less than condition C above, so the safety factor is even greater. F. The chlorine contact chamber is smaller than the clarifier. Therefore, maximum compressive stress is less than condition D:above, so the safety factor is even greater. i