The proposed Part 4 of the Standard on energy efficiency index (EEI) of pump units focusses on multistage submersible pump units for boreholes. These are a special type of single pump units, i.e. they consist of a hydraulic and of an electric part. Compared to single pump units treated in Part 2, multistage submersible pump units for boreholes are characterized by the special design of their hydraulic part and of their electric motor. Both are adapted to have a small as possible outer diameter. Furthermore, the motors used as drives are very different from standard dry motors and show various features, for instance they are operated filled with liquid. From these reasons, their attainable efficiencies are well below the minimum required values of standard asynchronous motors. Operation of multistage submersible pump units at fixed speed as well as – in combination with a frequency converter – at variable speed is in use. Multistage submersible pump units have – dependent on their type of application – typically other flow-time profiles and - in the case of controlled variable speed – other pressure control curves than those defined in Part 2 of the Standard. Also the typical application in boreholes requires further special design and operation features as the
integration of a non-return valve and often relatively long electric cables from ground down to the pump drive. Part 4 will give special definitions (e.g. reference flow-time profiles, reference pressure control curves and the reference electric power input) that have to be applied when determining the energy efficiency index (EEI) of multistage submersible pump units. Also Part 4 will describe two methods and procedures how to determine the energy efficiency index (EEI) of multistage submersible pump units in the frame of qualification or verification. One of the methods consists of testing the complete pump unit and of corresponding evaluations. The alternative method uses a so-called semi-analytical (i.e. mathematical) model (SAM) of the respective type of multistage submersible pump unit and is a specialization of the model and method described in Part 2 of the Standard for other types
Registration number (WIID)
64972
Scope
The proposed Part 4 of the Standard on energy efficiency index (EEI) of pump units focusses on multistage submersible pump units for boreholes. These are a special type of single pump units, i.e. they consist of a hydraulic and of an electric part. Compared to single pump units treated in Part 2, multistage submersible pump units for boreholes are characterized by the special design of their hydraulic part and of their electric motor. Both are adapted to have a small as possible outer diameter. Furthermore, the motors used as drives are very different from standard dry motors and show various features, for instance they are operated filled with liquid. From these reasons, their attainable efficiencies are well below the minimum required values of standard asynchronous motors. Operation of multistage submersible pump units at fixed speed as well as – in combination with a frequency converter – at variable speed is in use. Multistage submersible pump units have – dependent on their type of application – typically other flow-time profiles and - in the case of controlled variable speed – other pressure control curves than those defined in Part 2 of the Standard. Also the typical application in boreholes requires further special design and operation features as the
integration of a non-return valve and often relatively long electric cables from ground down to the pump drive. Part 4 will give special definitions (e.g. reference flow-time profiles, reference pressure control curves and the reference electric power input) that have to be applied when determining the energy efficiency index (EEI) of multistage submersible pump units. Also Part 4 will describe two methods and procedures how to determine the energy efficiency index (EEI) of multistage submersible pump units in the frame of qualification or verification. One of the methods consists of testing the complete pump unit and of corresponding evaluations. The alternative method uses a so-called semi-analytical (i.e. mathematical) model (SAM) of the respective type of multistage submersible pump unit and is a specialization of the model and method described in Part 2 of the Standard for other types
