Answer Happy

98-Mar-B5 December 2016 Page 10 of 20 QUESTION 8 PUMP AND SYSTEM CHARACTERISTICS Refer to the Examination Paper Attachments Page 15 Pump and System Characteristics This page (Page 15) for (a) and (b) must be returned with the answer booklet. (a) On the top axes given sketch the following: 0 Head versus flow characteristics of one centrifugal pump supplying water to a typical pipe system. Identify the operating point. (ii) Head versus flow characteristic of a second identical pump in parallel supplying the same system. Identify the operating point. (3) (b) On the bottom axes given sketch the following: 0) Head versus flow characteristics of one centrifugal pump supplying water to a typical pipe system as in (a) above. Identify the operating point. (11) Head versus flow characteristic of the pump and system when a control valve in the system is closed to reduce the flow. Identify the operating point. (IT) Head versus flow characteristic of the pump and system when the pump speed is raised to increase the flow. Identify the operating point (3) (c) In the answer booklet do the following: 0) Explain what factors govern the setting (elevation with respect to the surface level of the liquid supply to the pump) of a centrifugal pump. (ii) Explain the consequences if the setting limitations have not been met and how and where the pump may suffer damage or not perform properly. (4) [10 marks ]
98-Mar-B5 December 2016 Page 15 of 20 EXAMINATION PAPER ATTACHMENTS NAME QUESTION 8 PUMP AND SYSTEM CHARACTERISTICS (a) Parallel Pumps On the axes below plot head versus flow characteristics for cases (i) and (ii). Head H Flow Q (b) Flow Control On the axes below show the effect of a control valve and pump speed change for cases (i) and (iii) compared with case (i). Head H Flow Q