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Lee Tunnel Main Pump Rag Test
Lessons Learned from an Extraordinary Pump Test
Maik Ulmschneider, KSB AG Ciaran Heaney, Thames Water
Lee Tunnel Main Pump Rag Test Lessons Learned from an Extraordinary - - PowerPoint PPT Presentation
Lee Tunnel Main Pump Rag Test Lessons Learned from an Extraordinary - - PowerPoint PPT Presentation
Lee Tunnel Main Pump Rag Test Lessons Learned from an Extraordinary Pump Test Maik Ulmschneider, KSB AG Ciaran Heaney, Thames Water Lee Tunnel Rag Test Agenda 1) About the Project 2) Rag Test Requirements 3) Test Facility 4) Rag Tests
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Lee Tunnel Rag Test
About the Project
Source: www.waterprojectsonline.com/case_studies/2012/Thames_Lee_Tunnel_2012.pdf
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Lee Tunnel Rag Test
About the Pump
Type: KSB GIW SVP-84 Operating Range: 3,050 l/s @ 87 m 1,950 l/s @ 17 m Weight: 54 t Rated Power: 3.5 MW
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Lee Tunnel Rag Test
Requirements
Material: shredded cotton and polyester, rags and grit Concentration: 2 kg/m³ dry weight rags 400 mg/l grit Rag Dimensions: ≤ 1,000 mm x 75 mm Test Duration: 6 hrs
Source: www.riegellinen.com
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Lee Tunnel Rag Test
Test Facility
Location: GIW Hydraulic Laboratory Grovetown, GA, USA
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Lee Tunnel Rag Test
Test Facility
Location: GIW Hydraulic Laboratory Grovetown, GA, USA
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Lee Tunnel Rag Test
Rag Tests
Test 0: Clear water test to create base pump curve under scaled conditions Test 1: Preliminary test to prove test rig and test criteria are fit for purpose Test 2: As Test 1 with altered loading sequence Test 3: Initial rag length 100 mm for test dynamic to be taken into account Test 4: Initial rag length 200 mm for test dynamic to be taken into account Test 5: Initial rag length 1,000 mm with altered loading sequence
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Lee Tunnel Rag Test
Test 2
Loading Sequence: < 250 mm (1/3 of total) 250…500 mm (1/3 of total) 500… 1,000 mm (1/3 of total)
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Lee Tunnel Rag Test
Test 2
Findings:
- No clogging in first 90
- mins. (first set)
- Losses 3% on head and
6% on efficiency
- Pump clogged during
second set
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Lee Tunnel Rag Test
Test 2
Findings:
- No clogging in first 90
- mins. (first set)
- Losses 3% on head and
6% on efficiency
- Pump clogged during
second set
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Lee Tunnel Rag Test
Test 2
Findings:
- Firm and tight ropes and
clumps were formed, exceeding 1,000 mm length by far.
- Ropes mainly consisted of
250 mm rag segments.
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Lee Tunnel Rag Test
Test 3
Loading Sequence: Full concentration as fast as possible, but with initial length 100 mm
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Lee Tunnel Rag Test
Test 3
Findings:
- No clogging during full test
period
- Losses on head and
efficiency within set limits
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Lee Tunnel Rag Test
Test 3
Findings:
- No clogging during full test
period
- Losses on head and
efficiency within set limits
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Lee Tunnel Rag Test
Test 3
Findings:
- Firm and tight ropes and
clumps were formed, mostly within the range of 500…1,000 mm.
- Some ropes exceeded
length of 1,000 mm by far.
- Ropes were mostly formed
by fibres.
- A significant amount of rag
sludge was found in the system.
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Lee Tunnel Rag Test
Test 3
Findings:
- Firm and tight ropes and
clumps were formed, mostly within the range of 500…1,000 mm.
- Some ropes exceeded
length of 1,000 mm by far.
- Ropes were mostly formed
by fibres.
- A significant amount of rag
sludge was found in the system.
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Lee Tunnel Rag Test
Test 4
Loading Sequence: Full concentration as fast as possible, but with initial length 200 mm
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Lee Tunnel Rag Test
Test 4
Findings:
- Pump clogged after
approximately 30 mins. after full concentration was loaded.
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Lee Tunnel Rag Test
Test 4
Findings:
- Pump clogged after
approximately 30 mins. after full concentration was loaded.
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Lee Tunnel Rag Test
Test 4
Findings:
- Firm and tight ropes and
clumps were formed, exceeding 1,000 mm length by far reaching weights up to 80 kg.
- Ropes consisted of fibres.
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Lee Tunnel Rag Test
Test 4
Findings:
- Firm and tight ropes and
clumps were formed, exceeding 1,000 mm length by far reaching weights up to 80 kg.
- Ropes consisted of fibres.
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Lee Tunnel Rag Test
Conclusion
- The Lee Tunnel Main Pump can handle rags up to 1,000 mm
x 75 mm.
- The dynamic behavior in a closed loop system of
conglomeration of ropes that form and ultimately break down must be taken into account.
- The strategy of starting with smaller rags that will develop
into conglomerations of the required size over time is an effective strategy for addressing this dynamic.
- A ratio in the range of 1:10 (initial to final size) proved