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close this bookOperation and Maintenance of Water and Sewerage Systems (Ministry of Water - Tanzania - Rwegarulila Water Resources Institute, 1999, 90 p.)
View the document(introduction...)
close this folderA. Maintenance of Water Supply Units Principles and General Procedures
View the document1. Introduction
View the document2. Operation and maintenance
View the document3. Inspections
View the document4. Inspections made before putting the unit into operation for first time
View the document5. Periodic inspections made normally without interrupting the operation
View the document6. Periodic inspections made by interrupting the operations
View the document7. Remedial measures
View the document8. Records
View the document9. Maintenance programmes
close this folderB. Operation and Maintenance in Tanzania
View the document1. What is operation and maintenance
View the document2. Constraints of operation and maintenance
View the document3. Strategies for operation and maintenance on sustainable basis
View the document4. Operational problems
close this folderC. General Guide Lines in Construction of Water Structure
View the document1. Intake structures
View the document2. Pumping stations
View the document3. Rising main
View the document4. Water treatment
View the document5. Gravity main
View the document6. Water tanks
View the document7. Distribution system
View the document8. The design of the sewerage system
close this folderD. Operation and Maintenance Tasks and Their Frequencies
View the document1. Water Supply
View the document2. Sanitation
close this folderANNEXES
View the document1. Class Test (in Swahili)
View the document2. Evaluation Form (in Swahili)
close this folder3. Group work - Operation and Maintenance of the following:
View the document- Intake structure
View the document- Pumping station
View the document- Water treatment unit
View the document- Water mains
View the document- Water tanks
View the document- Sewerage systems

9. Maintenance programmes

It should be appreciated that it will not be possible to design and implement a maintenance programme which will satisfy all conditions everywhere. An individual schedule must be worked out for each individual system taking into consideration the local conditions. It should be remembered that such a schedule is dynamic and ought to be modified and improved all the time. The reports and records on the system and its maintenance will greatly help in the elaboration of the details for the modification and improvement of the maintenance schedule. A systematic maintenance programme based on records and realistic schedules and provided with the necessary logistics will ensure a reliable service with less frequent breakdowns and shorter interruptions.

9.1 Components of Maintenance Programme

In order to be effective a maintenance programme must have sound

- administrative;
- financial; and
- technical

components.

The discussion in this Module deals with the technical aspects only. It should be pointed out, however, that the technical measures cannot be fully realized without the necessary administrative and financial support.

9.2 Inventory

In preparing a maintenance schedule for the first time one should start with a survey of the water supply systems and make an inventory of all components and units of the systems. Details of each unit should be recorded separately on suitable simple forms which could eventually provide a complete history of the unit and thus of the system of which it is a part. In case there are no previous records, the second thing to do will be to complete the records as appropriate where possible.

9.3 Tasks

After the completion of the inventory, the tasks to be carried out and their frequency shall be determined taking into account local conditions and experience. Presentation should be best in tabular form.

9.4 Schedules

The work schedule which may be tabulated should show the work to be done at the prescribed frequency at every location. The individual items can be given reference numbers and the frequencies figures or signs to show whether the tasks are weekly, monthly, quarterly, six monthly, yearly, etc., in order to make the tabulated summaries handy.