Resources, Tools and Basic Information for Engineering and Design of Technical Applications! - adapts seamlessly to phones, pads and desktops! Ads by Google ► Water Lines ► Calculation ► Water Usage ► Water Pipes Search - "Search is the most efficient way to navigate the Engineering ToolBox!" Water Supply - Calculating Expected Demand Calculating of expected demand in water supply service lines Sponsored Links Flow Meters Wholesale alibaba.com/Flow-Meters Find Quality Products from Verified Suppliers. Get a Live Quote Now! The total theoretical demand for a water supply system can easily be calculated by adding all fixtures known maximum demand. Due to the nature of intermittent use the number of fixtures will unfortunate add up to unrealistic demands for the main supply lines to handle. A realistic demand for a supply system will always be far less than the total theoretical demand. The expected demand in a water supply system can be estimated like qet = qnl + 0.015 ( Σqn - qnl ) + 0.17 ( Σqn - qnl ) 1/2 (1) where qet = expected total water flow (l/s) qnl = demand of largest consumer (l/s) Σqn = total theoretical water flow - all fixtures summarized (l/s) Note that the minimum expected total water flow can never be less than the demand from the largest fixture. The equation is valid for more ordinary systems where the consumption patterns are more continuously as in homes offices nursing homes etc. Be aware when using the equation for systems serving large groups of people where the use is intermittent, like in hotels hospitals schools theaters wardrobes in factories etc It may be typical for applications like this, like a wardrobe, that all showers are used at the same time. Using the formula blindly would result in insufficient supply lines. Example - Main Water Supply to a Nursing Home If the theoretical demand from all fixtures in a nursing home adds up to 50 l/s and the larges fixture requires 0.4 l/s, the expected water supply demand can be estimated like qet = (0.4 l/s) + 0.015 ((50 l/s) - (0.4 l/s)) + 0.17 ((50 l/s) - (0.4 l/s)) 1/2 = 2.3 (l/s) Total Theoretical Water Flow and Expected Flow Expected demand for a supply system at different total theoretical demand can based on the formula above be expressed as Total Theoretical Demand Summarized (liter/s) Expected Demand (liter/s) 0.2 0.2 0.8 0.4 1.6 0.5 4.0 0.6 8.0 0.85 15 1.1 20 1.5 30 1.8 40 2.1 65 2.8 70 2.9 100 3.7 The maximum fixture load is 0.2 liter/s. Water Supply - Expected Demand (pdf) Sponsored Links Pressure Vessel Designer? analyzeforsafety.com 1st blog on vessel design and FEA share your passion and get inspired Related Topics Water Systems - Hot and cold water systems - design properties, capacities, sizing and more Related Documents Converting WSFU to GPM - Converting Water Supply Fixture Units - WSFU - to GPM Public Buildings - Water Supply - Required water supply in public buildings Sizing Water Supply Lines - Sizing water supply service and distribution lines based on Water Supply Fixture Units (WSFU) Recommended Sizes of Water Supply Lines - Sizing water supply pipes Fixture Water Requirements - Demand at individual water outlets Water Supply Fixture Units - WSFU - WSFU are used to determine water supply to fixtures and their service systems Water Usage and Activity - Average water usage per activity Tag Search en: water supply expected demand calulate formula Search the Engineering ToolBox Search - "Search is the most efficient way to navigate the Engineering ToolBox!" 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