Accumulation of loose deposits in pipe segments Accumulation of loose deposits in pipe segments K.Neilands K.Neilands , , J. Rubulis J. Rubulis and M.Bernats and M.Bernats Department of Water Engineering and Technology, Riga Technical University, Latvia Department of Water Engineering and Technology, Riga Technical University, Latvia kaspars . neilands @ rtu .lv , , janisrubulis @ gmail . com Objectives & Approach Objectives & Approach Results Results Conclusions Conclusions The measured online turbdity during UDF can be used as a tracer and applicable to calculate the accumulated sediment quantity in pipe segments. The amount of loose deposits washed-out from cast iron pipes varied from 0.07-0.69 kg/m measured as suspended solids. The average velocities of flushing ranged from 0.2-2.34 m/s and shear stress 0.43-2.05 N/m2 acting on pipe walls. The crystalline phase analyzes showed predominance of quarz and goethite in loose deposits. Knowledge of the sedimentation processes depending on temporal variations of daily velocities and the influence of irregularities of pipe layout on accumulation procees of loosed deposits is object for ongoiing study. Figure 4. Layout of flushing routes for cast iron pipes of Ø 200-400 mm (AutoCAD 2005). The UDF actions are performed in the numbered order. References References Boxall J. B., Saul A.J., Gunstead J.D. and Dewis N. (2003) Regeneration of discolouration in distribution systems. Proc. ASCE, EWRI, World water and environmental resources conference, Philadelphia, USA Figure 1. Discoloured water from tap Figure 6. Mass of accumulated and during UDF actions washed-out loose deposits was calculated assuming conversation relationship proposed by Boxall et al. (2006). Discolourations of drinking water is second most often described complain from consumers in water industry after the interruption of water supply. Particles from drinking water network can be washed- out using uni-directional flushing (UDF) method. The aim of this study was to calculate the amount of loose deposits from cast iron pipe segments during several UDF campaigns. Figure 2. Online measuring equipment used during UDF campaign Siemens SITRANS FN MAG 8000 and Ultraturb ™ with controller sc100™. Figure 3. Flushing of 400 mm cast iron pipe Figure 7. The stereomicroscope image of loose deposits washed- out from drinking water networks with predominantly dominated quarz and goethite. Bar 500 μm. Figure 9. Calculated concentration of loose desposits per meter of flushed pipe from route 4 Figure 5 Turbidity curve obtained with online equiment for flushing route 4 Figure 8. Mass of calculated loose deposits and flushing velocity in individuals pipe segments during UDF campaign for pipes Ø 100-300mm. Methods Methods

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Accumulation of loose deposits in pipe segments K.Neilands , J. Rubulis and M.Bernats Department of Water Engineering and Technology, Riga Technical University, Latvia [email protected] , [email protected]. Objectives & Approach. - PowerPoint PPT Presentation

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Page 1: Accumulation of loose deposits in pipe segments K.Neilands , J. Rubulis and M.Bernats

Accumulation of loose deposits in pipe segments Accumulation of loose deposits in pipe segments

K.NeilandsK.Neilands,, J. Rubulis J. Rubulis and M.Bernatsand M.Bernats

Department of Water Engineering and Technology, Riga Technical University, LatviaDepartment of Water Engineering and Technology, Riga Technical University, Latvia

[email protected], , [email protected]

Objectives & ApproachObjectives & Approach

ResultsResults

ConclusionsConclusionsThe measured online turbdity during UDF can be used as a tracer and applicable to calculate the accumulated sediment quantity in pipe segments. The amount of loose deposits washed-out from cast iron pipes varied from 0.07-0.69 kg/m measured as suspended solids. The average velocities of flushing ranged from 0.2-2.34 m/s and shear stress 0.43-2.05 N/m2 acting on pipe walls. The crystalline phase analyzes showed predominance of quarz and goethite in loose deposits. Knowledge of the sedimentation processes depending on temporal variations of daily velocities and the influence of irregularities of pipe layout on accumulation procees of loosed deposits is object for ongoiing study.

Figure 4. Layout of flushing routes for cast iron pipes of Ø 200-400 mm (AutoCAD 2005). The UDF actions are performed in the numbered order.

ReferencesReferencesBoxall J. B., Saul A.J., Gunstead J.D. and Dewis N. (2003) Regeneration of discolouration in distribution systems. Proc. ASCE, EWRI, World water and environmental resources conference, Philadelphia, USA

Figure 1. Discoloured water from tap

Figure 6. Mass of accumulated and during UDF actions washed-out loose deposits was calculated assuming conversation relationship proposed by Boxall et al. (2006).

Discolourations of drinking water is second most often described complain from consumers in water industry after the interruption of water supply. Particles from drinking water network can be washed-out using uni-directional flushing (UDF) method.The aim of this study was to calculate the amount of loose deposits from cast iron pipe segments during several UDF campaigns.

Figure 2. Online measuring equipment used during UDF campaign Siemens SITRANS FN MAG 8000 and Ultraturb ™ with controller sc100™.

Figure 3. Flushing of 400 mm cast iron pipe

Figure 7. The stereomicroscope image of loose deposits washed-out from drinking water networks with predominantly dominated quarz and goethite. Bar 500 μm.

Figure 9. Calculated concentration of loose desposits per meter of flushed pipe from route 4

Figure 5 Turbidity curve obtained with online equiment for flushing route 4

Figure 8. Mass of calculated loose deposits and flushing velocity in individuals pipe segments during UDF campaign for pipes Ø 100-300mm.

MethodsMethods