RECOMMENDED PRACTICE

DNV GL AS

The electronic pdf version of this document found through http://www.dnvgl.com is the officially binding version. The documents are available free of charge in PDF format.

DNVGL-RP-0075 Edition November 2014

Inspection and maintenance of jacking systems

DNV GL AS

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This service document has been prepared based on available knowledge, technology and/or information at the time of issuance of this document, and is believedto reflect the best of contemporary technology. The use of this document by others than DNV GL is at the user's sole risk. DNV GL does not accept any liabilityor responsibility for loss or damages resulting from any use of this document.

FOREWORDDNV GL recommended practices contain sound engineering practice and guidance.

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General

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Acknowledgement

DNV GL wants to thank its partners Paragon Drilling, Rowan Drilling, Seadrill, Prospector Drilling, Noble

Drilling and the UAEs National Drilling Company; recently merged service suppliers Energy Service

International and WillTeco; and vendor Cameron Le Tourneau for their engagement, input and cooperation

throughout the Joint Industry Project (JIP) Jacking Systems resulting in this Recommended Practice (RP).

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Sec.1 Introduction.................................................................................................. 6

1.1 Background ............................................................................................6

1.2 Objective................................................................................................6

1.3 Scope .....................................................................................................6

1.4 Application .............................................................................................6

1.5 Structure ................................................................................................6

1.6 References ............................................................................................7

1.7 Definitions and abbreviations.................................................................7

1.7.1 Definitions ...................................................................................7

1.7.2 General definitions .........................................................................9

1.7.3 Abbreviations ...............................................................................9

Sec.2 Competence levels ...................................................................................... 10

2.1 General.................................................................................................10

2.2 Competence level descriptions .............................................................10

2.2.1 Level 1 .......................................................................................10

2.2.2 Level 2 .......................................................................................10

2.2.3 Level 3 .......................................................................................10

2.2.4 Level 4 .......................................................................................11

2.2.5 Level 5 .......................................................................................11

2.3 Hand-over between different roles.......................................................11

Sec.3 Inspection................................................................................................... 12

3.1 Introduction .........................................................................................12

3.1.1 Structure ....................................................................................12

3.2 Operational inspections........................................................................12

3.2.1 General ......................................................................................12

3.2.2 Rig moves...................................................................................12

3.2.3 Periodical inspections ...................................................................12

3.3 Detailed inspections .............................................................................13

3.3.1 General approach.........................................................................13

3.3.2 Wear vs. fatigue life .....................................................................14

3.3.3 Focus areas.................................................................................14

3.4 Extraordinary inspections.....................................................................16

Sec.4 Maintenance................................................................................................ 20

4.1 Introduction .........................................................................................20

4.2 General considerations.........................................................................20

4.3 Replacement of jacking system elements.............................................20

4.4 Spares .................................................................................................21

4.4.1 General ......................................................................................21

4.4.2 Critical spares .............................................................................21

4.4.3 Obsolescence ..............................................................................21

4.4.4 Baseline .....................................................................................22

Sec.5 Information requirements........................................................................... 23

5.1 Introduction .........................................................................................23

5.2 Design information ..............................................................................23

5.2.1 General ......................................................................................23

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nts5.2.2 Life time expectation ....................................................................26

5.2.3 Material and welding specifications .................................................275.2.4 Replacement criteria ....................................................................275.2.5 Life cycle status ...........................................................................275.2.6 User/maintenance manual.............................................................27

5.3 User and maintenance records .............................................................285.3.1 General ......................................................................................285.3.2 User records................................................................................285.3.3 Maintenance records ....................................................................29

5.4 Calculation of jacking system fatigue life .............................................295.4.1 Introduction ................................................................................295.4.2 Approach ....................................................................................29

Sec.6 Specific components .................................................................................. 31

6.1 Introduction .........................................................................................31

6.2 Guides, jack house and racks ...............................................................31

6.3 Shock pads ...........................................................................................32

6.4 Enclosed gearing ..................................................................................33

6.5 Climbing pinion including bearings and other non-enclosed gearing ....34

6.6 Braking system ....................................................................................35

6.7 Power/motor system ...........................................................................35

6.8 Control systems ...................................................................................366.8.1 General ......................................................................................366.8.2 Software.....................................................................................376.8.3 Ageing and availability..................................................................37

Sec.7 Further improvements ................................................................................ 39

7.1 Introduction .........................................................................................39

7.2 RAM approach ......................................................................................397.2.1 Objective ....................................................................................397.2.2 Case study..................................................................................39

7.3 RCM approach ...