Service Contract No 2007 / 147-446 - Swaziland

6 . 3 M a i n t e n a n c e S u r v e yWhen the impact of maintenance practices was evaluated, it was decided to classify theexisting maintenance practices followed by the producer, according to existing literaturesources as acceptable if it will not influence the performance of the system adversely andunacceptable/ineligible if it will impair the performance. The acceptable values are viewed asthe absolute minimum values for the sustaining of an acceptable Us value in the system.Table 7. Maintenance schedule for sprinkler irrigation systemsInspect the system for leakagesMonitor With each cycle AnnuallyCheck system pressure and system flowService air valves and hydrantsCheck sprinklers for wear and replace springs,washers and nozzles where necessaryXXXXFlush mainlinesXTable 8. Maintenance practices implemented by FAMonitor Results ClassificationInspect the system for leakages Daily AcceptableCheck system pressure and system flow Never UnacceptableService air valves and hydrants Attend to fault UnacceptableCheck sprinklers for wear and replace springs, washersand nozzles where necessaryNeverUnacceptableFlush mainlines Never UnacceptableThe following is a list of items that require urgent maintenanceIntake sump requires urgent attentionThe balancing dam is leakingPump and mechanical control valveInstallation of vacuum gauges and one pressure gauge before pump control valvesReplace all damaged and hardened gasketsReplace all worn male and female pipe fittingsMaphobeni Farmers Association Report - 2009 Page - 51 -