Plumbers NZ | Plumbing, Gasfitting and Drainage Community

QUESTION 5
(a)  State TWO causes of excessive noise in a pressure pumped water system, and give a
remedy for each.
Cause         
Remedy
           
Cause         
Remedy
           

(2 marks)
(b)  Give TWO reasons why a pump or a pressure system may continue to stop and start
whether or not water is being used, and give a remedy for each.
Reason         
Remedy
           
Reason         
Remedy
           

(4 marks)
(c)  State TWO methods of automatically controlling the water level in a supply tank from a
pumped system.
1         
       
2         
       

(2 marks)

(d)  Explain what is meant by the term positive suction head in a pump system.
         
       

(1 mark)
(e)  State the purpose of a foot valve on a suction line and explain why it is required.
Purpose         

Explanation         
       

(2 marks)
(f)  Name ONE type of pump best suited for each of the following situations on a water supply.   
(i)  A pump required for suction and pumping.
   
(ii)  A pump installed at water level and required to pump water only.
         
       

(1 mark)
Total 12 marks