Patent ID: 11909185
Assignee: PLUMETTAZ HOLDING SA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F | IPC F  H

Claim 8:
9. The method according to claim 1, wherein the method comprises the initial steps of:
measuring or determining an internal diameter of the duct, an external diameter of the cable, and a slope of the duct between its extremities,
setting a leaking surface of the leaking plug to be equal to or greater than a surface of a circular hole having a diameter Dhole:, D
      hole
    
    ≥
    
      1.8
      ⁢
      
        
          
            
              
                
                  
                    D
                    hydro
                    
                      5
                      ⁢
                      
                        /
                      
                      ⁢
                      7
                    
                  
                  ⁢
                  
                    ρ
                    w
                    
                      9
                      ⁢
                      
                        /
                      
                      ⁢
                      14
                    
                  
                
                
                  
                    μ
                    w
                    
                      1
                      ⁢
                      
                        /
                      
                      ⁢
                      7
                    
                  
                  ⁢
                  Δ
                  ⁢
                  
                    
                  
                  ⁢
                  
                    p
                    leak
                    
                      1
                      ⁢
                      
                        /
                      
                      ⁢
                      2
                    
                  
                
              
              ⁡
              
                [
                
                  g
                  ⁢
                  
                    
                  
                  ⁢
                  
                    sin
                    ⁡
                    
                      (
                      α
                      )
                    
                  
                
                ]
              
            
            
              4
              ⁢
              
                /
              
              ⁢
              7
            
          
          ⁢
          
            (
            
              
                D
                d
                2
              
              -
              
                D
                c
                2
              
            
            )
          
        
      
    
  
  ,, With:, D
    hydro
  
  =
  
    
      2
      
        1
        +
        
          
            
              
                D
                d
              
              -
              
                D
                c
              
            
            
              
                D
                d
              
              +
              
                D
                c
              
            
          
        
      
    
    ⁢
    
      (
      
        
          D
          d
        
        -
        
          D
          c
        
      
      ), where:, Dc is the external diameter of the cable (m),, Dd is the internal diameter of the duct (m),, Δpleak is the leaking pressure drop (Pa) across the leaking plug,, ρw is the density of the pressurized liquid (kg/m3),, α is the average angle of the duct with the horizontal,, g is the acceleration of gravity (9.81 m/s2),, μw is the dynamic viscosity of the pressurized liquid (Pas).