Jacket Weighing Procedure

SATELLITE FIEL D DEVELOPMENT PROJECT (PHASE I) ITUT AND AB ANG JA CKET WEIGHING PROCEDURE PROCEDURE

MOBIL PRODUCING  NIGER IA

Prepared, Prepared, Reviewed, Reviewed, Endorsed and App roved b y: Person Person

Descrip Descrip tion

Gordon Dunthorne NIGERDOCK NIGERDOCK Engineer Manager

Prepared by

Melchor Yaun NIGERDOCK NIGERDOCK Lead Engineer

Checked by

Jagba Smart NIGERDOCK QA/QC Engineer Edward York NIGERDOCK NIGERDOCK Project Manager

Endorsed by

MPN Representative

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

Signature

 Approved by  Approved by

ii

Date Date

SATELLITE FIEL D DEVELOPMENT PROJECT (PHASE I) ITUT AND AB ANG JA CKET WEIGHING PROCEDURE

MOBIL PRODUCING  NIGER IA

REVISION MODIFICATION L OG

Revisio n

Section

Rev. A

ALL

ACTION

Descrip tion

Initial Document

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

Issued for Review/Comments

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SATELLITE FIEL D DEVELOPMENT PROJECT (PHASE I) ITUT AND AB ANG JA CKET WEIGHING PROCEDURE

MOBIL PRODUCING  NIGER IA

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

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

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SATELL ITE FIELD DEVELOPMENT PROJECT (PHASE I) ITUT AND ABANG JACKET WEIGHING PROCEDURE

1.0

MOBIL PRODUCING  NIGERIA

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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SATELL ITE FIELD DEVELOPMENT PROJECT (PHASE I) ITUT AND ABANG JACKET WEIGHING PROCEDURE

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SATELL ITE FIELD DEVELOPMENT PROJECT (PHASE I) ITUT AND ABANG JACKET WEIGHING PROCEDURE

MOBIL PRODUCING  NIGERIA

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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•

MOBIL PRODUCING  NIGERIA

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)

MPN – Rigging Supt. Mr. Allistair Thompson

Construction Support Mgr James Cunningham

Enerpac Load Cell operator

7.0

MOBIL PRODUCING  NIGERIA

Watch Over Assistant Odom Anefiok

Stand-by Team  plus Maintenance Group: Scaffolders Welders Electrician Helpers Fitters Forklift

Safety Officer – In charge Mr. Kayode Omojag bara

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.

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7.1.5

MOBIL PRODUCING  NIGERIA

STANDBY TEAM – A support team for any immediate fabrication required or assistance in related matters. It comprises of the following: The number of personnel will be determined by Construction Support Manager. Scaffolders Welders Electrician Helpers Fitters Forklift Operators Load Cell Maintenance Personnel (1) – Part of the support team to assist on any mechanical fault on cranes during operation.

8.0

COMMUNICATION  A communication exercise between the involving personnel will be established prior to Weighing Operation. A minimum of two (2) days is expected for this exercise before the final Weighing operation and one (1) day prior to Pre-Weigh meeting. During the operation the Hand Signaling, Verbal and Radio will be the means of communication. Spare radio equipment will be made available.  All the Instructions will come from the Construction Support Manager; he gives the instructions and receives the information from his subordinates. This coordination will come from Load Cell Operators and Safety In charge. The communication between the involved personnel will be by means of one radio channel in order to ensure clear communication. The Load Cell Operators and any assistant will communicate to the Construction Support Manager whenever the event or situation of the Load Cell is in dangerous position. The instruction will be three STOPS, ex. “STOP! STOP!! STOP!!!”. The four (4) Load Cells used in the operation will be named and identified as follows: Load Cell C1 Load Cell C2 Load Cell C3 Load Cell C4

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MOBIL PRODUCING  NIGERIA

Name tags will be placed on each load cell for identification.  A co-ordination exercise will be undertaken 3 days prior to the operation with Load Cell operators if the Construction Support Manager feels they are not experienced enough. 9.0

METHOD 9.1       

 

PREPARATION:

All Rigging and Weighing Appliances should have all certifications checked prior to use. Remove all obstructions that will hinder the operations. During operation the area shall be limited to nominated yard personnel only.  All other personnel shall observe operation from outside the taped area. Load Cells shall be positioned as specified in the drawings. Any Required Rigging equipment shall be positioned in accordance to the specified drawings. All radio communication shall be checked if working properly. The Over all control of the operation shall be Construction Support Manager who will be in touch with the personnel as defined by Communication sections of the procedures. During Weighing Operation, all client communicate shall be addressed through Project Manager or his deputy. A pre-weighing meeting shall be held between ND Team and Company to discuss the procedure and issues concerned. All procedure shall be clear to both parties and pass JSA (Job Safety Analyses) prepared by the Construction Support Manager with support from the Safety Department.

9.2

A pre weighing meeting shall be held to ensure that everyone involved understand the procedure. This will also ensure that the coordination between load cell operator, Construction Support Manager and safety personnel is achieved.

9.3 During weighing a 50% load shall be tested on each load cell as specified on the above theoretical value of each load point, and measurement shall be taken and recorded. All loads in the load cells will be measured. When the 50% load is achieved, the structure will be lifted gradually until a full 100% load is achieved at a height of 100mm from the support and this operation is to be repeated a minimum of 3 times and readings recorded for each lift operation.

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9.4 Acceptance criteria of the final recorded value of the 3 weighing operations shall be the average of the 3 recorded values and this value should not differ from the maximum of any of the 3 values by more than 0.7%. The tolerance of the enerpac load cell should be equal to or less than 1%. 9.5 The maximum load on any one load cell shall between 20-80% of their total load capacity. 9.6

10.0

If the weighing is achieved and satisfies the operation, the structure will be put back in original position otherwise the weighing operation will be repeated again.

ANALYSIS: This section explains the procedure performed for the analysis of the ITUT  jacking stool. The data for the model was taken from the weight control and CofG report produced by Nigerdock and analysis was performed on Staad-pro See attachements in Appendix A

11.0 DATA ANALYSIS The following members are included in this analysis are: LOAD LIST SELF WEIGHT C.O.G. LOAD CELL REACTIONS CODE CHECK AISC LFRD 12.0

REFERENCES: Nigerdock Shop Drawings Reference: 1. ND-ITT-710-GA-200-A1 2. ND-ITT-710-GA-201-A1

The reports of the analysis are based on the following specifications:

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1. AISC 9th Edition 2. API 2A (RP2A)  APPENDIX A SFDP-TOPSIDE WEIGHING-BEAM-1 SFDP-TOPSIDE WEIGHING-BEAM-2  APPENDIX B CURRENT JACKET WEIGHT CONTROL SUMMARY

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SATELL ITE FIELD DEVELOPMENT PROJECT (PHASE I) ITUT AND ABANG JACKET WEIGHING PROCEDURE

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