Jacket Weighing Procedure

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      SATELLITE FIELD DEVELOPMENT PROJECT

    (PHASE I)

    ITUT AND ABANG JACKET WEIGHING PROCEDURE

    NGTA-NK-NPZZZ-00-XXXXXXX Rev. A ii

    MOBIL

    PRODUCING

     NIGERIA

    Prepared, Reviewed, Endorsed and App roved by:

    Person Descrip tion Signature Date

    Gordon Dunthorne NIGERDOCK Engineer

    Manager

    Prepared by

    Melchor Yaun NIGERDOCK Lead Engineer

    Checked by

    Jagba Smart

    NIGERDOCK QA/QC Engineer

    Endorsed

    by

    Edward York NIGERDOCK Project

    Manager

     Approved by

    MPN Representative  Approved

    by

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      SATELLITE FIELD DEVELOPMENT PROJECT

    (PHASE I)

    ITUT AND ABANG JACKET WEIGHING PROCEDURE

    NGTA-NK-NPZZZ-00-XXXXXXX Rev. A iii

    MOBIL

    PRODUCING

     NIGERIA

    REVISION MODIFICATION LOG

    Revision Section ACTION Descrip tion

    Rev. A ALL Initial Document Issued for Review/Comments

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    ITUT AND ABANG JACKET WEIGHING PROCEDURE

    NGTA-NK-NPZZZ-00-XXXXXXX Rev. A iv

    MOBIL

    PRODUCING

     NIGERIA

    TABLE OF CONTENTS

    1.0 SCOPE OF WORK 1

    2.0 INTRODUCTION 1

    3.0 CONCLUSION 2

    4.0 SAFETY 3

    5.0 EQUIPMENT 5

    6.0 ORGANIZATIONAL CHART 6

    7.0 PERSONNEL 7

    8.0 COMMUNICATION 8

    9.0 METHOD 8

    10.0 ANALYSIS 10

    11.0 DATA ANALYSIS 13

    12.0 REFERENCES 13

     APPENDIX A

     APPENDIX B

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    1.0 SCOPE OF WORK This procedure describes the method that will be utilized for   the weighing of SFDP Jackets pertaining to ND’s Scope of work for Mobil Producing Nigeria.

    This procedure is based on SFDP Jackets, SFDP Jacket Weight is 258.2 Mt (as of estimate 27-01-). 

    2.0 INTRODUCTION

    This document describes the weighing of ITUT Jacket Structural Analysis of the

    Jacking point currently being fabricated at Nigerdock Nigeria FZE, located at Snake Island Apapa Lagos.

    The method of weighing will be firstly place sheets of 30mm thick steel plate under the jacket grillage points, then insert jacking stool frames in position directly under the centre of each platform support leg and to place the enerpac load cells immediately on top of this jacking stool support frame (shimmed to suit) This will enable 4 enerpac load cells wires to be run and utilized along with the enerpac control panel ensuring accurate recording of the weighing exercise.

    Drawing ND-ITT-710-GA-200-A1 Below clearly shows enerpac locations and

    wiring connected to the main control panel

    The structural analysis on the jacking stool was carried out using Staad Pro 2004, the design and checking is in accordance with AISC ASD 9 th Edition and

     API RP2A All Dimensions used in this procedure are based on SI units and weight calculation in Mtons.

    3.0 CONCLUSION:

    The analysis performed on the jacking stool satisfies the structural integrity to withstand the stresses and that the deflection is within the allowable limits

    Maximum stress ratios for weighing are listed below:

    - 0.608 for load cell C3 - 0.649 for all other load cells

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    4.0 SAFETY

    •  Before the Weighing operations commence, risk assessments followed by Job

    safety analysis (JSA) will be completed for all work undertaken by ND’s personnel,

    and any subcontractor employed in the work. The approved JSA will be discussed

    among the workforce prior to commencing any Jacking activity.

    •  The Gantry side where the intended structure for Weighing will be temporarily

    positioned must be cordoned off from unauthorized persons and visitors. Barrier

    control will be strictly enforced. No personnel will be allowed in the vicinity of

    suspended loads. •  Only authorized persons shall partake in the JSA meeting

    •  ND shall ensure all procedures are understood and workers are briefed as to any

    potential worksite hazards. All identified hazards or potential hazards shall be

    promptly eliminated or controlled.

    •  ND shall ensure all works related to the Weighing are carried out in a safe and

    efficient manner and that safe systems of work are prepared and implemented.

    •  ND shall ensure all equipment are safe, suitable for the operation, kept in good

    condition and that defects are identified and follow up action initiated to repair

    defective equipment or withdraw it from site.

    •  All Weighing Equipment shall be inspected prior to use and will have an up to date

    certification.

    •  A pre-weighing checklist shall be used to verify safe systems of work are in place,

    the check list shall be endorsed by MPN Heavy Lift Advisor.

    •  ND shall ensure all places of work, including work at heights, etc are safe and

    where necessary adequate control measures shall be implemented through JSA,

    Risk Assessment or Toolbox talks.

    •  Risk assessment will be carried out by ND and Company and will be developed by

    the Risk Charter Group as per required procedures.

    •  JSA will be developed based on the RA findings.

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    •  An emergency response plan will be developed by the Safety Group.

     All personnel involved in this operation shall:

      Avoid harm to themselves and prevent harm to others

      Utilize and maintain all issued protective equipment in the correct

    manner.

      Be aware of, and comply with all relevant project HSE procedures.

      Make appropriate suggestions for the improvement of safety within the

    operations.

    ND shall ensure all personnel involved in the Weighing campaign are PPE

    compliance at all times (Coveralls, steel toe shoes, Hard hat, Safety Glasses)

    as minimum requirements..

    5.0 EQUIPMENT:

    This section describes the minimum equipment needed to perform this operation. All Equipment to be used in this procedure shall be checked and certified by a recognized certifying authority. Equipments required for the Weighing operation are not limited to the following list:

    ENERPAC

    4 off ENERPAC 500t LOAD CELLS complete with central control panel

    JACKING STOOL  As fabricated by Nigerdock

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    6.0 ORGANIZATIONAL CHART (FOR WEIGHING OPERATION)

    7.0 PERSONNEL AND RESPOSIBILITIES

    7.1.1 CONSTRUCTION SUPPORT MANAGER (1) – He is in charge of the Over all Operation during weighing. All personnel involved in this operation will report to him. He gives the instructions to any Load Cell Operators, and Assistance Personnel. He is also responsible to have all certification to hand over to Company for review prior to weighing.

    7.1.2 MPN – Rigging Superintendent (1) – He is responsible for checking that the overall approved methodology has been followed before, during and after the weighing.

    7.1.4 SAFETY PERSONNEL – Responsible for all works related to the Weighing are carried out in a safe and efficient manner and that safe systems of work are prepared and implemented. During Operation one single Safety Officer will be inside the Barricaded area for communication with Safety Personnel on the outside of the barrier.

    Construction Support

    Mgr James Cunningham

    Safety Officer – In cha

    Mr. Kayode Omojag ba

    Watch Over Assistant

    Odom Anefiok

    Enerpac Load Cell operator Stand-by Team

     plus Maintenance

    Group: Scaffolders

    Welders

    Electrician Helpers

    Fitters

    Forklift

    MPN – Rigging Supt.

    Mr. Allistair Thompson

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    7.1.5 STANDBY TEAM – A support team for any immediate fabrication required or assistance in related ma