In this model, there is a pond with an inflow rate of approximately 600 m3/day and 3 pumps are used to remove water from the pond. The pumps can only be operated if there is a sufficient depth of water in the pond according to this depth schedule:
*Pump_1: Water_Level > 1.0m
*Pump_2: Water_Level > 2.0m
*Pump_3: Water_Level > 2.5m
The reliability elements check to ensure sufficient water depth using a Condition type node in the External Requirements tree. Each pump has a capacity of 300 m3/day with a chance of failing on average once per year. If a failure occurs in any of the pumps, a repair is automatically initiated and takes an average of 30 days to repair. The calculation of the water removed from the pond by the pumps is done using a series of if/then/else statements referencing the condition of each pump. For example, the contribution of Pump_1 is calculated using the following if/then/else statement: if (Pump_1 = RL_Operating, 300 m3/day, 0 m3/day).
To Open the Model File:
- Start GoldSim
- Click on the File and select Open Example...
- Browse to Reliability Examples
- Select the file called Pond.gsm