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PENAWARAN UNTUK :
PENGEBORAN VIBRO CORING DI PERAIRAN PANTAI LABU SUMATERA
KEPADA :
PT PANDU PARAMITRA
JL JUANDA MEDAN SUMUT
DIKERJAKAN OLEH:
B
B
BELANTI BARAT DAMAI
JL. DAMAI NO. 48 B, MEDAN
SUMATERA UTARA-20219
Attention
Prepared by
Authorized by
Proposal
Issued Date
: HENDRO
: NOVRIAL AMRAN
:
: 12 JULI 2016
UTARA, INDONESIA
B
B
VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
DAFTAR ISI
1.0
PEMBUKA
2
2.0
PENDAHULUAN
2
3.0
SYSTEM PEKERJAAN
3
4.0
METODE KERJA
3
5.0 SPESIFIKASI TEKNIS
4
6.0
PERALATAN SURVEY DAN PERSONIL
6.1 PERALATAN SURVEY
6.2 PERSONIL
5
7.0
AREA SURVEY
6
8.0
RINCIAN BIAYA
7
9.0
TERMS AND CONDITIONS
7
5
Page 1
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VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
1.0 PREFACE
BELANTI BARAT DAMAI adalah perusahaan konsultan yang bergerak di bidang survey baik darat maupun laut.. Kami telah
melaksanakan survey untuk beberapa project baik perusahaan swasta maupun pemerintah.
Untuk itu kami menawarkan kepada bapak untuk melakukan pekerjaan vibro core di Perairan Pantai Labu –
Sumatera Utara
Berikut kami sampaikan metodologi pekerjaan dan daftar personil untuk pelaksanaan pekerjaan tersebut.
2.0
PENDAHULUAN
Vibro coring adalah teknologi dan teknik untuk pengambilan sample di dalam air atau di dasar laut. Mekanisme vibro
corer atau disebut juga “ vibro hammer” dioperasikan dengan menggunakan electrical power yang bersumber dari
bagian luar. Tabung core di masukkan kedalam corer dan di masukan kedasar laut di tekan dengan penggunaan
gravitasi serta tenaga dari tekanan dengan menggunakan piston atau hidrolik. Setelah corer masuk kedalam sesuai
dengan ketentuan maka corer di naikkan dan tabung di keluarkan dari corer serta di lakukan litologi dengan cara
membelah tabung.
Page 2
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5.0
VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
B
Spesifikasi Teknis
Dimensions
Transport situation
Length
Width
Height
Draft
Operational Situation Crane
Length Capacity
Height
Weight Capacity
Tugboat & Crane Bus 120 Feet
120 Feet
12 m
2 m
3m
15 m
3m
7,5 ton
Vibration Unit
Capacity
Voltage
Amp
Frequency
2 units wacker type AR15 380
2 x 1,9 kw
3 x 380V
2 x4 A
50 Hz
Control Desk (see electric scheme)
0-rings in vibration head
Type Buna N
- 633.48 x 5.33
- 608.08 x 5.33
O ring piston
57 x 5
O ring liner 700
69,5 x 3
O ring liner 1000
99,5 x 3
Electric cable
Connector
7x1,5mm2
Harting type Han M (green}
16 pins
Underwater connector
SubConn BH8M/IL8F
Page4
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VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
6.0 PERALATAN SURVEY DAN PERSONIL
6.1 PERALATAN
-Seabed System BV Electric Vibro Corer
-DGPS CSI Omnistar
-Laptop PC
-Generator 50 kVa onboard Tug boat
6.2
PROPOSED PERSONNEL
Item
Description
1
Supervisi Surveyor
2
Logistic Officer
3
Vibrocorer Operator
4
Electrical Technician
5
S.I Technician
6
Helpers
Page5
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VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
7.0 AREAL KERJA
Pantai Labu
Page 6
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VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
B
8.0 RINCIAN BIAYA
Berikut Rincian Biaya Pekerjaan Vibro Coring
VIBRO CORING WORKS PERAIRAN PANTAI LABU SUMATERA UTARA, INDONESIA
No
:
Subject
:
Penawaran Harga Sampling Pasir Menggunakan Vibro Core di Perairan Pantai Labu
No
Uraian
Unit
Quantity
Unit Price
Amount
SOIL INVESTIGATION VIBRO CORING
I
1
Preparation Of Work
Mobilisasi – Demobilisasi Alat Vibro
Core dan Kapal
rite
2
65,000,000
130,000,000
2
Akomodasi & Konsumsi
Ls
1
30,000,000
30,000,000
3
Core Tube
tube
16
500,000
8,000,000
II
Field Works
1
Vibro Core 10 m
Pts
16
30,000,000
480,000,000
2
Sewa Kapal dan Crane 7,5 Ton
set
1
200,000,000
200,000,000
3
Jaga Malam
Days
10
2,000,000
20,000,000
III
Reporting & Analysis
1
Expert Analysis
Ls
1
15,000,000
15,000,000
2
Final Report & Bore Log
Expl
3
500,000
1,500,000
TOTAL
884,500,000
9.0 TERMS AND CONDITIONS
i) Tahap I 10% pembayaran setelah penandatanganan kontrak
ii) Tahap II 20% pembayaran setelah kapal dan alat sampai dilokasi
iii) Tahap III 50 % pembayaran setelah pelaksanaan pekerjaan lapangan selesai
iv) Tahap IV 20% pembayaran setelah laporan dan bore log diserahkan.
v) Mobilisasi selama 1 minggu setelah pembayaran tahap I dicairkan
Page 7
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VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
PHOTOS
Page 8
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VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
Page 9
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VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
VIBROCORER
CONTENTS
1.0 INTRODUCTION
2.0 CORING SYSTEM
2.1
2.2
2.3
2.4
2.5
2.6
WORKING PRINCIPLE
TRANSPORTATION
RIG-UP PROCEDURE
INSTALLATION PROCEDURE - PISTON SYSTEM
HANDLING CORING
CORING
3.0 MAINTENANCE
3.1
3.2
3.3
3.4
3.5
3.6
FRAME
VIBRATOR HEAD
VIBRATION UNIT
PISTON SYSTEM
CORING SYSTEM
CONTROLS
Page 1
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VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
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1.0 INTRODUCTION
The Seabed Electric/hidrolic Vibrocorer is designed for the coring of seabed-samples in a softsediment situation.
The unit is controlled from the control-desk, from which the power supply to the vibration unit can be
checked.
On the next pages functioning, operation and maintenance are briefly described.
2.0 CORING
The system consist of the following components;
- Sea bed frame
Frame
-Top Bridge
-Vertical guiding pillars
Vibrator Head
-Housing (ratable)
-Suspension frame
-Vibration unit
-Adapter
Coring System
-Core-barrel (compl. With catcher/stabbingshoe)
-Liner
-Piston or Air Bleed System
Controls
-Control box
-Electrical cable on reel
-Connection with main powe supply
Misscellaneous
-Penetration-indicator
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VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
2.1 WorkingPrinciple
By means of a vibtation unit a osciallatory movement is introduced on the core-barrel.
Through this movement, friction between core-barrel and sediment is diminished.
The weight of the vibrating head with guiding system result in a vertical force, which leads to
the penetration of the core-barrel into the sediment.
When using a piston which is installed inside the core-barrel, the piston wire is suspended
from the frame. When moving the core-barrel downwards, the piston remains in a static
position in relation to the seabed.
In case the seabed sediment is pushed downwards by the core-barrel shoe a small
underpressure is created between piston and sediment, which stimulates the soil material to
intrude into the barrel.
2.2 Transportation
During transportation the short guiding pillars are installed. They will bundle the vibratorhead
with the seabed frame.
2.3 Rig-Up Procedure
-
-
Remove the reel with electric cable
Remove the top bridge construction between the transport guiding pillars
Place the top bridge on the top ends of the guiding pillars and secure the connection
Assemble the cable of the penetration indicator and the four wirebraces on the top bridge
Erect the pillars with the top bridge and lead the pillars with the top bridge, through the
tubes of the suspension frame of the vibration head till they are stuck on the seabed frame
Beware of damaging the plastic tube of the suspension frame
Lift the vibrator head up by means of the man hoist and run it up and downward. If it does
not smoothly, check the parallelity of both guiding-pillars and if necessary adapr the brace•
wires
Check if the electrical cable has not been damaged
Check if adequate power is available for the unit to operate according to the specification
Check safety switches
Connect the control box to the power
Lift the vibrating head approximately 1 metre by means of the main hoist
Switch on the main switch
Check the level on the ampere meter during start and free runnig and stop the vibrator
If all system are checked and approved the unit is ready for operation
Page 3
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VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
2.4 Installation procedure witha piston system
Install the ball clamp on the adapter housae
Remove the two caps on the adapter house
Check the core-barrel for damage
Check if the core-barrel is undamaged and works properly, if not install a new
stabbingshoe with corecatcher
Take a PVC liner of proper length and diameter
Run a wire through the liner and the adapter house via the ball clamp
Check if the liner is clean
Connect the friction of the piston with the liner
Run the PVC liner trough the barrel
2.5 Handling
Rotate the vibrator head, until the centre latch comes in horizontal position;secure it in
this position Install the 0-ring on the top part of the liner until it is stuck on the top of the
barrel (this for easty extraction of the liner from the barrel after the operation). Connect
the core-barrel to the adapter by means of special nut; secure the nut by means of a
split pin Open the bottom clamp on the foot plate Remove the securing for the horizontal
positioning of the vibrator head and lift the vibrator head up. Doing so guide the corebarrel carefully by hand When the vibrator head is in the top position, the core-barrel will
be in vertical positon, while a little space is left between the ship deck and bottom edge
of the stabbingshoe Push the depth indicator upwards until the small clamp is on the
suspension frame Lower the core-barrel carefully and put the stabbingshoe down in
the central opening on the deck f the ship. If necessary put a wooed block on the ship
deck, to prevent damaging the stabbingshoe
Submergingto the seabed
Check if all ropes and wires are runnig free
Check waterdepth and the length of the available electric cable
Check if the ship position is correct in reference with the current
Lift the complete installation up by means of the main hoist, and bring it on the side board
of the ship, parallel with the ship and lower it until the vibration head can be secured in its
vertical position
When using a piston, connect the wire of the piston to the top bridge and fill the barrel
with water above the piston hoist the unit over the side of the vessel and put it in line with
the direction of the current
Lowe it carefully; pay attention to the movement of the frame when it touches the sea
surface.
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VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
Lower the installation towards the seabed
Try to determine if the installation remains in the right postion when it touches the seabed
by observing the movement of the hoisting cable after the touch down
2.6 Coring
Start the vibration unit by means of switch
Observe the amperage on the control box during operation
Check if hoisting cable and/or electric cable have enough slack for the 3 or 5 m
downward movement of the vibrator head
If during operation the empere meter on the control box show a level higher or lower than
noemal the peration should be stopped
In the first case the ground resistance has become to high, in the latter the vibration unit
is stuck on a hard ground layer or in the frame
Recovering the frame
The lifting of the frame from the seabed must be done carefully because the core-barrel
could be stuck in the ground or the frame could be covered by seabed sediment in case
of very soft soil conditions
Lift the frame toward the sea surface; pay attention to the stabe position of the frame in
the current
As soon as the top of the vibration unit reaches the surface, make sure that the position
of the frame is parallel wuth the ship. If necessary rotate the frame until the position will
be parallel with the ship cental latch
Lift the frame abve sea level and bring it alongside the ship
Remove the securing of the vertical position of the vibration head
Then bring the installation on the ship deck
Make a note of the penetration rate which can be derived from the depth indicator
Open the level on the central clamp in the foot plate
Pull the core-barrel aside by hand and lower the vibtration head carefully until the core•
barrel is brought into horizontal position
Secure the vibrator head in its horizontal position
Remove the corebarrel; use a chain clamp if necessary
Pull ut the liner from the barrel
The ins.tallation is now ready for a new coring procedure
Page 5
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VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
3.0 MAINTENANCE
3.1 Frame
- All connection pins and shafts must be kept free from rush by grease
- Damaged parts of the paint sytem must be repaired immediately
- The connection points at the bottom and on top of the vertical guides must be kept clean and
free from rust by regularly greasing it. Also prevent rush on the vertical guiding pillars to
optimize the vertical movement of the vibrator head.
3.2Vibrator Head
- All the external moving parts such as rotation shaft, blocking pin adapter etc,. must be kept
clean and free from rust by greasing
- Check that the cable connector is tight
- All bolt connections of the vibrator head must be regularly checked whether they are tight
with a force of 24 kilogram./metres
- The four bolts above the two hinge points have to be fastened by 16kg./m
- The two sealing of the vibrator head must be checked every 4 months when used
extensively a more regular check is advised
- If there is any damage on the seal it has to be replaced. Utmost care has to be taken during
the assembly of the sealing and the vibrator head
3.3VibrationUnit
- Check every 4 months during the inspection of the sealing if the vibration motors are still
solidly connected to the base plate of the head
- Check the wear of the gear wheels. If wear is noted, the motors are not correctly lined
up;restore this, if necessary replace the gear wheel
- Check if the mounted bolts of the vibration motors are fastened with a force of 18
kilogram/metres.
3.4Piston System
- Check piston and piston wire for damageand/or rust
- Clean and grease them if necessary
- Check 0-rings
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VIBRO CORING DI PERAIRAN PANTAI LABU,
SUMATERA UTARA, INDONESIA
3.5Coring System
- All components (barrels, stabbingshoe, cather, liner, connection nut) have to be checked
before each core procedure
- check the sliding resistance of the penetration indicator
3.6Controls
- Check the control box regularly on dirt or damage and check if the electrical cable connector
is tifgtened. Repair if necessary
- Grease the main shaft of the electric reel regularly
- Check the electric cable regularly on wear and damage
- Check if the electric connectors are dry and clean
Page 7
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