Buoyancy of Offshore Pipelines
 
  The Archimedes principle applies
                     
  (Enter values in yellow cells for calculations and in blue cells as information)
  INPUT DATA
                Pipe Size    
  Pipe External Diameter,  De =   mm Diameter Nominal, DN = 
mm  
                     
  Pipe wall thickness, t =   mm Schedule = 
   
                     
  Coating Thickness, t =   mm Coating  =     
                     
  Steel pipe Density, ρp =   kg/mᶟ   Pipeline Fluid  =     
                     
  Seewater Density, ρw =   kg/mᶟ Pipe Internal Diameter, Di =   mm  
                     
  Pipeline Fluid Density, ρf =   kg/mᶟ Coating External Diameter, Dc =   mm  
                     
  Coating Density, ρc =   kg/mᶟ The principle of Archimedes is applied knowing that the    
      force of buoyancy will be the weight of the volume of    
      seawater that displaces less the weight of the pipe    
        (including the fluid and the coating if applicable)    
                     
                     
  CALCULATIONS
                     
  Weight of steel pipe per m Wp =     kgf/m Wp = {[π(De-Di)²]/4}ρp        
                     
   Weight of coating per m, Wc =   kgf/m Wc = {[π(Dc-De)²]/4}ρc        
                   
  Weight of fluid inside the inner cylinder , Wf =   kgf/m Wf = [(πDi²)/4]ρf          
                   
  Weight of seewater displaced per m Ww =   kgf/m Ww = [(πDe²)/4]ρw or Ww = [(πDc²)/4]ρw    
                     
  Bouyance Force =   kgf/m Bouyance = Ww-(Wp+Wc+Wf)      
                     
  Bouyance =                
                     
                     
  Buoyancy of Offshore Pipelines  
   
  The Archimedes principle applies  
                 
  (Enter values in yellow cells for calculations and in blue cells as information)  
  INPUT DATA  
                Pipe Size      
  Pipe External Diameter,  De =   in. Nominal Pipe Size, NPS = 
in.    
                       
  Pipe wall thickness, t =   in. Schedule = 
     
                       
  Coating Thickness, t =   in. Coating  =       
                       
  Steel pipe Density, ρp =   lb/ftᶟ   Pipeline Fluid  =       
                       
  Seewater Density, ρw =   lb/ftᶟ Pipe Internal Diameter, Di =   in.    
                       
  Pipeline Fluid Density, ρf =   lb/ftᶟ Coating External Diameter, Dc =   in.    
                       
  Coating Density, ρc =   lb/ftᶟ The principle of Archimedes is applied knowing that the      
      force of buoyancy will be the weight of the volume of      
      seawater that displaces less the weight of the pipe      
        (including the fluid and the coating if applicable)      
                       
                       
  CALCULATIONS  
                       
  Weight of steel pipe per ft Wp =   lbf/ft Wp = {[π(De-Di)²]/4}ρp          
                       
   Weight of coating per ft, Wc =   lbf/ft Wc = {[π(Dc-De)²]/4}ρc          
                     
  Weight of fluid inside the inner cylinder , Wf =   lbf/ft Wf = [(πDi²)/4]ρf            
                     
  Weight of seewater displaced per ft Ww =   lbf/ft Ww = [(πDe²)/4]ρw or Ww = [(πDc²)/4]ρw      
                       
  Bouyance Force =   lbf/ft Bouyance = Ww-(Wp+Wc+Wf)        
                       
  Bouyance =