## General Systems

This section contains a collection of systems that illustrate how to combine the individual items demonstrated in the common examples to form simple non-compressible liquid models.

The collection of models comprises:

- Three Reservoirs - Calculate flow under gravity between three reservoirs at different elevations.

- Tank to Joint Overflow - Calculate the pressure drop in a pipe when the flow rate is known.

- Gravity Flow to Three Outlet Points - Calculate the flow rates to three discharge points.

- Fixed Flow Pump to Three Tanks - Calculate the pump head required for a given flow rate.

- Fixed Head Pump to Three Tanks - Calculate pressure drop across flow control valves.

- Fixed Speed Pump - Calculate the operating performance and duty point on the pump curve.

- Pressurized Pumping Stations - Calculate flows & pressures across multiple pumping stations.

- Reverse Pipe - Calculate a system where the flow direction in a pipe needs to be reversed.

- Energy Recovery with Turbine - Model a turbine component and estimate energy recovery.

- Top Up Tanks in a Closed Loop - Model a pressurized domestic heating recirculation system.

- Replacement Pipe Size - Calculate the impact of replacing pipes with different sizes.

- Step By Step - Build a small 5 pipe model following a step-by-step guide.

- Pressure Reducing Valves - Limit pressure in parts of a system and maintain outlet pressures.

- Back Pressure Valves - Maintain a minimum pressure at specific points within a system.

- Fire Hydrant Supply - Model of a looped water distribution system with designed in redundancy.

- Ballast Water Discharge - Model pumping performance from sea chests to overboard discharge.

- Balanced Flow Distribution – Calculate orifice sizes to provide equal flow distribution.