DNS Services

Demand Control Valve Theory Network Design

• A Network model of the system, including trunk mains supplying the DMA or DMZ areas.
• Existing pressure management structure within the DMA or DMZ area including if the PRVs are under fixed outlet, flow modulation or target point closed loop control.
• Peak summer and winter flow meter data for all the DMA or DMZ areas.
• If under pump control, we would require the pump information including the pumps curves and the control philosophy within the network.
• If the main is supplied via a gravity system, please provide the reservoir information (reservoir level trend profiles for both the winter and summer)
• Known issues or minimum pressures required within the DMA or DMZ areas.  Like DG2 issues, high rise buildings that do not have their own booster etc.
• Trunk mains operational control philosophy if applicable.

Surge and Transient Analysis

• Long sectional profile of the main.
• If under pump control, we would require the pump information including the pumps curves and the control philosophy within the network for both the winter and summer periods.
• If the main is supplied via a gravity system, please provide reservoir information (reservoir level trend profiles for both the winter and summer periods)
• Information on existing surge protect devices already installed within the network e.g. Surge vessels etc.
• If the main is existing and already installed please provide information of existing air valve locations, including the installed air valve sizes and models if known.
• Information on any control valves located within the network e.g. Pressure reducing valves, Eccentric plug valves, reservoir control valves or float control valves etc.

Building Pressure Management & Surge Protection

• Schematic of the building pipeline system included pipeline sizes and required flow rates per floor.
• Type of building is it residential, commercial and if its a residential building is it likely to be purchased by an investment company so could suffer from low occupancy  
• Booster pump information pack.
• Firefighting requirements minimum pressure per floor and required flows per floor.  If required and if connected to the cold water boosted system.