Using the nomogram and charts (FIGURES 1 and 2) on pages 4 and 5, determine the diameter of a...

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Using the nomogram and charts (FIGURES 1 and 2) on pages 4 and 5, determine the diameter of a suitable air main for the distribution of 6 m3 min-1 FAD. System pressure is 6 bar, the length of the pipe run is 175 metres, and a maximum pressure drop of 0.3 bar is allowed.The distribution main must also include the following• 4 bends (r = 2d) • 2. elbow fittings • 6 tee connectors • 2 diaphragm valves.Q13:Describe the relevant advantages and disadvantages of using steel, copper or plastic pipe for a distribution main.Q14:What problems may occur if a pipe is specified• larger • smallerthan the optimum value?
	
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David · Accepted Answer

1 
 
Question 12  
System pressure = 6 bar  
Length of the pipe = 175 m 
Maximum pressure drop = 0.3 bar  
Diameter of air main for distribution of 6 m
3 
min
-1 
FAD =? 
Details of distribution main are given below: 
 4 bends  
 2 elbow fittings  
 6 tee connectors 
 2 diaphragm valves  
Here,  
Pipe flow    6         
         (
 
  
)             
Let the initial velocity is 15 m/ sec.  
Continuity equation       
Initial area   
 
 
 
    
  
             
Area of cylinder   
 
 
   
  √
  
 
  √
         
 
                   
Now,  
  (          )    (    )   (     )   (     )   (              )   (        ) 
2 
 
  (          )      (     )  (   )  (    )  (   )           
Further,  
    
    
  
             
Based on the given mammogram image, the respective line would be passed through the 
intersecting point between the flows in order to get a pressure drop of 2.2 mbar per meter. Hence,
It is apparent that                     
Therefore, it is essential to select a diameter greater than 100 mm.  
Pressure drop = 2.2 m bar per meter
3 
 
Question 13  
The relevant advantage and disadvantages of using a steel, copper or plastic pipe for the 
distribution main are given below: 
1. Distribution main made up of steel pipe  
Advantages  
 Significantly high durability  
 Resistive nature to abrasion  
 Long service life  
 Low cost installation  
 Produce low vibration and noise    
Disadvantage  
 Weight of pipe is significantly high  
 High prices  
 Difficult to transport  
 Heavy weight of pipes is the reason of constructing shorter length pipes, which increases 
number of joints in the distribution main and finally,

Using the nomogram and charts (FIGURES 1 and 2) on pages 4 and 5, determine the diameter of a suitable air main for the distribution of 6 m3 min-1 FAD. System pressure is 6 bar, the length of the pipe...

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