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 B B 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 B 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 B B 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 B B VIBRO CORING DI PERAIRAN PANTAI LABU, SUMATERA UTARA, INDONESIA 7.0 AREAL KERJA Pantai Labu Page 6 B 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 B B VIBRO CORING DI PERAIRAN PANTAI LABU, SUMATERA UTARA, INDONESIA PHOTOS Page 8 B B VIBRO CORING DI PERAIRAN PANTAI LABU, SUMATERA UTARA, INDONESIA Page 9 B B 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 B VIBRO CORING DI PERAIRAN PANTAI LABU, SUMATERA UTARA, INDONESIA B 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 Page2 B B 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 B B 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. Page 4 B B 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 B B 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 Page6 B B 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
