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DMA Design and Monitoring

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Module 2_ DMA Design & Monitoring_ Field Reality of DMAs

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1. When can a boundary valve be accepted as validated?
When its identity, operability, final position, and hydraulic effect are all supported by evidence. When the asset label says closed and the number of turns is recorded. When a chamber photo and one static pressure reading are available.
2. Why must pressure readings at different elevations be compared using total hydraulic head?
Because total head removes the need to synchronise logger clocks. Because gauges at different elevations must use different pressure units. Because elevation can cause different raw pressures even when points share the same hydraulic grade line.
3. What can near-identical timing and shape in pressure logger traces on opposite sides of a boundary indicate?
The boundary valve has been proven fully tight. An open valve, passing seat, or alternative intertie that requires corroboration. The logger elevations and calibration are automatically correct.
4. What should a technician do if abnormal torque or an unexpected network response occurs while operating a boundary valve?
Stop the operation, record the condition, and investigate under the approved procedure. Apply more force until the valve completes its expected travel. Continue operating and check the network after the valve reaches its final position.
5. What must be in place before conducting a live-network Pressure Zero Test?
A low pressure reading and permission from the field technician. Only confirmed inlet valves and a suitable hydrant for drawdown. Utility authorisation, safety controls, synchronised monitoring, and an approved restoration plan.