Appendix B 

 ESTIMATE OF COST OF A HYDRODYNAMIC FORM INSTALLATION 



In the following is an approximation of the cost of a 20 foot 

 diameter - 100 foot long hydrodynamic form fabricated of steel including 

 the associated structure and equipment. 



1. Cost of form construction assuming a shell thickness of 3/8". 



(a) Material Cost 



.375 

 Material volume = jt x 20 x „ x 100 



= 197 ft^ 



Material weight = 197 x 490 = 96,500 lbs 



Cost of form material at $.30 per lb = $29,000. 



Assuming the weight of the support structure and ribs as 3/4 of the 

 form weight; total cost of material for support structure and ribs = 

 3/4 X 29,000 = $22,000; total cost of material = 29,000 x 22,000 



= $51,000 



(b) Fabrication Cost 



Cost of fabrication at $.60 per lb = .60 x 96,500 x 1.75 



= $100,000. 



2. Cost of mechanical equipment to rotate form. 



The main energy dissipation associated with rotation of the 

 form is that due to water drag resistance. 



2 D 

 Water resistance torque « 1/2 Cj) A p V x t" 



where, V « 2itf x y = —r— x 5 = 2.62 ft/sec, for f = 5 rpm. 

 4 60 



A = 100 X 20 = 2,000 ft2 

 P = 1.94 slugs/ft3 

 Cd = 1.2 



56 



