Return slope (definition)

Return slope — is a term used in heating systems and water supply, which denotes the slope of the pipeline through which the return coolant or water circulates, relative to the horizontal plane.

Return slope: main aspects:

1. Principle of operation:
   • Reverse circuit: Return slope is applied to pipes that carry coolant from the heating (or water supply) system back to the boiler or central unit for reheating or processing.
   • Direction of flow: The correct slope helps maintain the movement of the coolant and prevents the accumulation of air and sediment in the pipeline.
2. Advantages:
   • Preventing stagnation: Slope helps to avoid dead spots in the piping where air or sediment can accumulate, which can reduce the efficiency of the system.
   • Removing air: Helps in the natural removal of air locks from the system that may occur in the return circuit.
   • Improving efficiency: Provides a more uniform distribution of the coolant, improving the overall efficiency of the heating system.
3. Installation recommendations:
   • Incline: It is generally recommended to have a slope of 1-2% (1-2 cm per meter of pipe length) for return pipes. This ensures adequate movement of the coolant without excessive pressure.
   • Installation: When installing pipes, it is important to maintain the correct slope to ensure the efficient functioning of the system and to prevent possible problems.
4. Errors and problems:
   • Insufficient slope: May cause air locks and sediment, which will reduce the efficiency of the system.
   • Excessive slope: May cause excessive coolant movement and increased pressure, which can also be problematic for the system.
5. Service:
   • Checking the slope: Regularly inspecting your pipes to ensure they are sloped correctly helps maintain system efficiency and prevent potential problems.
   • Cleaning: Periodic cleaning of pipelines is necessary to remove sediment and ensure normal slope.

Application:

The return slope is used in various systems, including heating, water supply and ventilation. In heating systems, the correct distribution and movement of the coolant is critical to maintaining the efficient operation and durability of the equipment.