Tanjung Priok GFPPEP - istiarto.staff.ugm.ac.id Test for CW Discharge Line and... · Tanjung Priok...
Transcript of Tanjung Priok GFPPEP - istiarto.staff.ugm.ac.id Test for CW Discharge Line and... · Tanjung Priok...
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Tanjung Priok GFPPEP
Presentation and discussion, 22 October 2009PT. PLN (Persero) Jasa Enjiniring OfficeJl. KS Tubun I/2 Petamburan, Jakarta
prepared byDepartment of Civil and Environmental Engineering UGMforMHI Heavy Industries, Ltd.Tohosago, Japan
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Physical model test to evaluate hydraulic performance of the CW discharge line and seal pit at Tanjung Priok GFPPEP Discharge capacity of the seal pit
▪ no flooding
Water surface profile along the seal pit and outfall▪ no overflow
▪ overflow, turbulence, washout
Energy dissipation at the outfall▪ effective dissipation at the outfall
▪ smooth transition of flow from outfall into the sea
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General layout
inner dia. 3.2 mlength ±60 m
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Model scale is defined at 1:15 considering
Availability of space
Pump capacity
Measuring instruments
A non-distorted model, i.e. similar horizontal and vertical length scale, is selected
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ParametersModel Scale
Notation Calculation Magnitude
Length, Width nL nL 15
Depth nL nL 15
Area nA nL2 225
Volume nV nL3 3,375
Time nT nL1/2 3.87
Velocity nU nL1/2 3.87
Discharge nQ nL5/2 871.42
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Model scale 1:15made of acrylic material
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ParametersPrototype Model
Magnitude Unit Magnitude Unit
Discharge structure
length 24 m 160 cm
width 16 m 106.7 cm
depth 7.9 m 52.7 cm
Discharge
2-pump operation 65,200 m3/h 20.8 ℓ/s
1-pump operation 39,120 m3/h 12.5 ℓ/s
Downstream flow depth
(at the Outfall)
HWL 5.4 m 36 cm
LWL 4.4 m 29.3 cm
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Model scale 1:15
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Water Surface ProfileEnergy Dissipation
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Water surface profile computation
Standard step method
One dimensional calculation
Use of HEC-RAS model
Energy dissipation computation
Analytical calculation
Calculation procedure follows the method explained in the USBS Design of Small Dams
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Channel
CW D i scha r ge
None of the XS's are Geo-Referenced ( Geo-Ref user entered XS Geo-Ref interpolated XS Non Geo-Ref user entered XS Non Geo-Ref interpolated XS)
None of the XS's are Geo-Referenced ( Geo-Ref user entered XS Geo-Ref interpolated XS Non Geo-Ref user entered XS Non Geo-Ref interpolated XS)
Head tank (pump pit)
Seal PitDischarge line
Computational Domain
0 2 4 6 8 10 12 14-4
-3
-2
-1
0
1
2
3
HEC RAS Tanjung Priok Plan: CW discharge 1 and 2 pump operation
Station (m)
Ele
vati
on (
m)
Legend
Ground
Bank Sta
0 2 4 6 8 10 12 14-4
-3
-2
-1
0
1
2
3
HEC RAS Tanjung Priok Plan: CW discharge 1 and 2 pump operation
Station (m)
Ele
vati
on (
m)
Legend
Ground
Bank Sta
Examples of cross sectionsJava Sea
Seal Pit
Stilling Basin
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Parameter Magnitude
Discharge 39,120 m3/h (one-pump operation)
65,200 m3/h (two-pump operation)
Sea water level −0.56 m (LWL)
+0.42 m (HWL)
Manning roughness coefficient 0.015
Discharge coefficient of the sill 1.4
Values of parameters applied in the water surface profile computation
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0 10 20 30 40
-6
-4
-2
0
2
4
HEC RAS Tanjung Priok Plan: CW discharge 1 and 2 pump operation
Main Channel Distance (m)
Ele
vation
(m
)
Legend
WS Q 39120 HWL
WS Q 39120 LWL
Ground
ROB
CW Discharge Channel
Stilling Basin Seal Pit
Java Sea
Pipe
Training wall +2.90m
WS +0.62mHWL +0.42m
LWL −0.56m
WS +2.31m
One-pump operation, Q = 39,120 m3/s
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0 10 20 30 40
-6
-4
-2
0
2
4
HEC RAS Tanjung Priok Plan: CW discharge 1 and 2 pump operation
Main Channel Distance (m)
Ele
vation
(m
)
Legend
WS Q 65200 HWL
WS Q 65200 LWL
Ground
ROB
CW Discharge Channel
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Stilling Basin Seal Pit
Java Sea
Pipe
Training wall +2.90m
WS +0.86mHWL +0.42m
LWL −0.56m
WS +2.56m
Two-pump operation, Q = 65,200 m3/s
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Conclusion
Distance of the maximum water surface at the Seal Pit from the training wall crest is only 30 cm
… but at the Stilling Basin is 2 m
Free-board at the Seal Pit is thus not sufficient
… but at the Stilling Basin is too high
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Recommendation
Increase of training wall along the Seal Pit from +2.90 m to +3.20 m
Lower down the training wall crest at the Stilling Basin from +2.90 m to 1.90 m
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hd
dTW ≥ 2.15dcP
He
He
PY
Lp 0.8dc
LB ≥ LP + 2.55dc
0.8dc
hd
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Parameter SymbolCooling water discharge
39,120 m3/h 65,200 m3/h
Width of sill crest b 16 m 16 m
Unit discharge q 0.6791 m3/s/m 1.1319 m3/s/m
Critical depth dc 0.36 m 0.51 m
Upstream head He 0.62 m 0.87 m
Drop height hd 1.70 m 1.70 m
Seal Pit water surface elevation +2.32 m +2.57 m
Stilling Basin water surface elevation +0.62 m +0.87 m
Stilling Basin water depth dTW 5.62 m 5.87 m
Distance of impinging jet from the sill Lp 3.35 m 4.69 m
Minimum distance of impact block from the
sill
Lp + 0.8dc 3.64 m 5.09 m
Minimum length of Stilling Basin LB ≥ Lp + 2.55dc 4.27 m 5.78 m
Minimum water depth in the Stilling Basin dTW ≥ 2.15 dc 0.78 m 1.09 m
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Conclusion The energy dissipation (by free overfall and
Stilling Basin) satisfies the requirement
Recommendation Displacement of the impact block farther away
from the overflow
present position at 3.25 m to 5.10 m
This is not critical since the basin depth is much deeper than the requirement
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Water Surface ProfileEnergy DissipationFlow VelocityFlow Pattern
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Two measurements are done Water surface profile
▪ Electronic device
Flow velocity▪ Imaging technique (PIV)▪ Acoustic Doppler (ADV)
Additional instuments Distance, level
▪ Staff gauge▪ Meter tape
Discharge▪ V-notch
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Imaging technique to measure flow pattern
Acoustic Doppler Velocimeterto measure flow velocity
Capacitance level meterto measure water level (dynamic)
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Staff gauge, meter tapeto measure distance, depth, elevation
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Water surface profile Energy dissipation Flow pattern Flow velocity
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Software EXEL
H=421mmH=375mm
H=334.5mm
Data of Water Level At Q h=14.6cm
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Camera
Light SheetSource
Model
Flow Pattern(PIV)
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Instantaneous velocity
(time average) velocity
turbulence intensity and stress
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