110427 Prep for Water Filling

8/2/2019 110427 Prep for Water Filling

1/14

1

PREPARATION FOR FILLING

OF

WATER-WAYS AT AMBUKLAO


2/14

2

FILLING OPERATION

Filling is made by use of two pumps at the intake, one pump is spare for theother. Use of the gate is not permitted.

Filling shall be made in a controlled manner, not exceeding an average pressure

increase of 5 m/hour. Stops in the filling is done to record the drawdown over

time, and to obtain the average filling speed.

During filling and stops, the level of water in the shaft shall be recorded, both

automatically and manually.

10 stops for water level monitoring is planned.

Increasing the water level to the next stop may take place when the water

drawdown is levelling out. This is considered when the drawdown is 2 - 3 m/h.

At firsts stops several refilling may be required before we may observe a

levelling out.

Before filling starts, various works needs to be done and items controlled.

Checklist is made for this purpose.

The filling is expected to take approximate 4 days.


3/14

3

Observation

stages

Initial Water

level

Volume of

waterway

(excl chamber)

to level

Estimated

Duration of stop

Maximum

drawdown before

re-filling Main Purpose

Elevation in m Hours Elevation in m

stage 1 6233105

2 N/A Record lekages in mechanical systems. Test of instrumentation,bypass valves ror emptying waterways

Stage 2 660

3401

2 N/A Check of adit gate, major lekages through gate concrete/rock,

lekages from mechanical system, instrumentation, V-notche

readings, pressure readings, other general leakage observations

Stage 3 680440

12 650 General leakage and pressure registation

Staeg 4 700

440


Stage 5 710220


Stage 6 720220


Stage 7 730220


Stage 8 740220


Stage 9 746130


Stage 10 752 130 8 715 General leakage and pressure registation

FILLING PROGRAM


4/14

4

TENTATIVE FILLING PLAN

600

610

620

630

640

650

660

670

680

690

700

710

720

730

740

750

760

0 10 20 30 40 50 60 70 80 90 100

HOURS FROM START OF FILLING

WATERLEVE


5/145

CHECKLISTS

Civils works

ME works


6/146

MONITORING PROGRAM

In addition to monitor the water level in the water way, the following

monitoring points shall be regularly monitored:

Pressure behind lining in manifold area

Pore pressure monitoring points in Access to Power House and outside

adit plug.

Leakage points in Access tunnel/valve Chamber, existing and New

Leakages over v-notches

Total leakage recorded in pump sump.


7/147


8/148

Monitoring

Stops

Waterat

maximum

elevationCriteriafor

LevellingOFF

Acceptable leakage

throughadit

plug

Increasedleakageat

leakagepoints

AcceptabLe

INCREASEDleakage

topump

sump

Increasedrockpore

pressurecombined

withcorresponding

increasedleakage

m/h l/min l/min l/min barandl/min

1) 2) 3) 4) 5)

stage1 623 N/A N/A 0 0 *)

Stage2 660 N/A 13,8 0 20 *)

Stage3 680 2 21,7 5 100 *)

Stage4 700 2 29,5 7,5 200 *)

Stage5 710 2 33,5 10 300 *)

Stage6 720 2,5 37,4 12,5 375 *)

Stage7 730 2,5 41,3 15 420 *)

Stage8 740 2,5 45,3 17,5 450 *)

Stage9 746 2,5 47,6 18,5 476 *)

Stage10 752 2,5 50 20 500 *)

1)

2)

3)

4)

5)

6)

Anyrockfallinaccesstoaditplugmaycallforimmediatestopoffilling,andtheneed fordischargeofwater

shall

be

assessed,

together

with

be

need

of

drilling

pressure

relief

holes

and

installing

additional

bolts.

Ifpressureincreaseswithsamerateandcorrespondingtoactualwaterpressurefromthetunnelatactual

elevationcombinedwithcorrespondingincreasedwaterleakage,fillingmaybestopped.

TENTATIVETRESHOLDVALUESTOSTOPFILLINGFORFURTHERASSESSMENTOFTHESITUATION

Ifthe

drawdown

suddenly

increases

during

stops,

together

with

falling

water

level,

filling

should

stop.

at

the

firststopsdrawdownmaybeashighas15 20m/hourduetofillingofpplugchamber.Anyaccidentalstop

duringfillingshallimmediatelybereportedfromIntake tocontrolsenter.

Highlekagesatlowpressuremaycallforadditional groutingoftheplug

Iflekagesshowtendenstoincrease duringmonitoringstopscombinedwithcolouredwater indicatingwasking

out,lowervaluestostopgroutingmayberequired.

Thetotalcapacityofthepumpsisumpis120l/s(or7200l/min) Ifpumpstops,fillingshallalsostop,andany

needto

start

discharging

water

shall

be

assessed.

Any

accidental

inflows

getting

close

to

pump

capacity

call

for

immediatestopoffillinganddischargeofwater.


9/149

Monitoring

Stops

Waterat

maximumelevation

Approx.max.

pressureat

Manometer

levelATPH,el

620

Approx.max

Pressureat

manometer

levelatAdit

PlugEl.625

bar bar

Pressuregauges Vnoche s Leakagepoints Pumpsump

Water

pressure

behindlining

Water

elevation

shaft

Basicreading

stage1 623 0,3 0 One

time One

time One

time One

time one

time 30

min

Stage2 660 4 3,5 60min 60min 60min 60min 60min 30min






Stage8 740 12 11,5 30

min 60

min 30

min 60

min 60

min 30

min

Stage9 746 12,6 12,1 30min 30min 30min 60min 60min 20min

Stage10 752 13,2 12,7 30min 30min 30min 60min 60min 20min

Notes:

PumpSump:

Pressuregauges:

Leakagepoint: AnymajorincreaseofleakagesatleakagepointsornewlekagesshallimmediatelybereportedtoShiftManager.

Doublereadingshallbemadeifincreasedleakageisrecordedtoavoidmistakes.

Followingobservedeventsfrequencyofreadingsmayneedtobeadjusted

Frequencyofreadingevery

Readingsisdoneautomaticallybyregisteringstopandstarttimeofthepumps.Monitoringpersonnelisrequiredto

obtain

actual

reading

at

frequency

indicted

for

further

reporting

to

management

Anysuddenincreaseinpressureupto tomaximumlevelfortherespectivemanometerandstageofmonitoring,see

above,shallimmediatelybereporedtoShiftManager.

FREQUENCY OF READINGS


10/1410

Team/Personnel Position Responsibility/Main taskDay shift Night Shift Day shift Night Shift Day shift Night Shift Day shift Night Shift Day shift Night Shift

8-20 20 - 8 8-20 20 - 8 8-20 20 - 8 8-20 20 - 8 8-20 20 - 8

Team 1

Svein Kvaalen Shift Manager

Overall responsible, Special task: direct

filling operation occurring at his

shift/Instructions to contractors

Tarald nomeland Dep. Shift manager

Dep. to shift Manager, Main responsibility

monitoring/ Special grouting taskplanner

Gil Geologist

Joseph Inspector/Engineer

Max

Eric

Vic Computer assitance

Office Backup/Adding data in Excel/making

plans etc/making site instrutions

From MCD

Kaos

From Andrits

Hansulrich Lirgg

Team 2

Terje Ellefsrd Shift Manager

Shift responsible, Special task: direct filling

operation occurring at his shift/Instructions

to contractors

Jan Idar kollstrm Dep Shift manager

Dep. to shift Manager, Main responsibility

monitoring/ Special grouting task planner

Val Inspector/Engineer

Dominique Inspector/Engineer

George Inspector/Engineer

Tom Inspector/Engineer

Rhodora Computer assistance

Office Backup/Adding data in Excel/making

plans etc/making site instrutions

From MCD

John

From Andrits

Severino Diriwachter In Charge

Day 1 Day 2 Day 3 Day 5Day 4

Leakage/pore pressure monitoring -observe

chaniges in leakage pattern, grouting follow

up etc. V-notch/pump pit observations,

Water level and lining pressure records

Leakage/pore pressure monitoring -observe

chaniges in leakage pattern, grouting follow

up etc. V-notch/pump pit observations,

Water level and lining pressure records

Filling records, Backup ME

failures/inspections

Filling records, Backup MEfailures/inspections

Prepareness for grout drilling, grouting,

sleeve installation, discharge valve

operation, safety

Prepareness for grout drilling, grouting,

sleeve installation, discharge valve

operation, safety

SHIFT PLAN/RESPONSIBILITY


11/1411

For monitoring works, each shift shall have 2 groups of 2 persons

each, who will divide the area geographically between each other.

There shall always be minimum 2 persons in the tunnel.

If one persons leave the tunnel, this shall be reported to the other

group.

All persons in the monitoring team shall be able to read pressure

gauges, v notches and record water leakages and receive training for

this.

Max and Gil is requested to perform this training. For this purpose a

minimum of 2 records per week to be made until filling start shall be

made by the groups

All monitoring points shall be shown on one drawing. The control room in the switchyard shall be command centre for the

filling operation


12/1412

SAFETY

MCD as main contractor will have overall responsibility for safety

A meeting will be conducted with the contractors at Site to go through

the filling operation and to identify the inherent risks

The following items are identified as important for the filling operation:

Communication

Sandbags outside valve chamber

Awareness and procedures of evacuation and escape routes

Safety gears (Flash lights)

Procedure for operation of discharge valves

No touch policy being in Power House and valve chamber


13/1413

SUPPORT FROM CONTRACTORS:

MCD:

Installation and operation of pumps at the intake. There shall be 2 operators at each shift.

Operation of discharge valves in Valve chamber. There shall be 2 operators at each shift.

Arrange communication: 2 radio with the monitoring teams, one radio at Intake, one at

valve chamber, one in Control room, one at shift Manager (Engineer) + backup and

battery charging facilitates. Name of those who shall carry radios shall be given to MCD

Team of skilled and unskilled workers to do grout drilling, grouting, sleeve setting and

other works required ( Handling of sandbags etc).

Personnel Safety of the operation

At Intake and valve-chamber, there shall always be one operator present even during meal

breaks. Names of operators, and works superintendant to be provided.

ANDRITZ: Operation/safeguarding data from monitoring equipment for water levels, Toother works required on Mechanical/electrical installations.

THE ENGINEERS DUTIES:

Overall management and decision making during the filling operation

Monitoring works inside the tunnels


14/1414

OTHER MATTERS

SAFETY MEETING WITH CONTRACTORS

PLANNING MEETINGS WITH CONTRACTORS

BASIC READINGS BEFORE START OF FILLING

CLOSE OUT OF CHECK LISTS

ON SCHEDULE TO START FILLING BY MAY 2, 2011

KICK OFF MEETING

SAFE JOB ANALYSIS

Date post:	05-Apr-2018
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110427 Prep for Water Filling

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