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【船级社】 DNV Conversion of ships.pdf
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【船级社】 DNV Conversion of ships.pdf
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The electronic pdf version of this document, available free of charge
from http://www.dnvgl.com, is the officially binding version.
DNV GL AS
CLASS GUIDELINE
DNVGL-CG-0156 Edition February 2016
Conversion of ships
FOREWORD
DNV GL class guidelines contain methods, technical requirements, principles and acceptance
criteria related to classed objects as referred to from the rules.
©
DNV GL AS February 2016
Any comments may be sent by e-mail to rules@dnvgl.com
If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of DNV GL, then DNV GL shall
pay compensation to such person for his proved direct loss or damage. However, the compensation shall not exceed an amount equal to ten
times the fee charged for the service in question, provided that the maximum compensation shall never exceed USD 2 million.
In this provision "DNV GL" shall mean DNV GL AS, its direct and indirect owners as well as all its affiliates, subsidiaries, directors, officers,
employees, agents and any other acting on behalf of DNV GL.
Changes - current
Class guideline — DNVGL-CG-0156. Edition February 2016 Page 3
Conversion of ships
DNV GL AS
CHANGES – CURRENT
This is a new document.
Contents
Class guideline — DNVGL-CG-0156. Edition February 2016 Page 4
Conversion of ships
DNV GL AS
CONTENTS
Changes – current.................................................................................................. 3
Section 1 Introduction............................................................................................ 7
1 General................................................................................................ 7
2 Definition of terms.............................................................................. 8
3 Structural testing.................................................................................8
4 Documentation requirements.............................................................. 8
5 Certification requirements................................................................... 8
6 Statutory regulations........................................................................... 8
Section 2 Conversions and alterations - structural strength................................... 9
1 Increased draught............................................................................... 9
2 Lengthening of vessels...................................................................... 14
3 Increased breadth............................................................................. 22
4 Increased depth.................................................................................23
5 Anchoring equipment.........................................................................24
6 Steering arrangement........................................................................ 27
7 Mounting of bottom equipment......................................................... 27
8 Ice belt.............................................................................................. 27
9 Strengthening for increased local loads.............................................29
10 Application of doublers/straps for longitudinal strength................. 33
11 Ladder access by means of cut-outs in ships side............................35
12 Ballast keels made from slabs......................................................... 36
13 Installation of special fixed ballast materials.................................. 36
Section 3 Mobilisation with temporary installations..............................................39
1 General.............................................................................................. 39
2 Temporary installations subject to class approval............................. 39
3 Plans and documentation.................................................................. 40
4 Temporary installation of small deck-mounted equipment and
heavy objects exempted from class review.......................................... 40
5 Guidance to structural arrangement, welding and material grades
for deck structure subject to uplift force..............................................43
6 Temporary installations of additional buoyancy units or units being
mounted on the outside of the vessel hull........................................... 43
7 Applicable loads for temporary installations......................................43
8 Operational limitations...................................................................... 44
Contents
Class guideline — DNVGL-CG-0156. Edition February 2016 Page 5
Conversion of ships
DNV GL AS
9 Fastening arrangement......................................................................44
10 Temporary accommodation units and other manned
superstructure units............................................................................. 46
11 Temporary deckhouse units being unmanned in heavy weather......47
12 Diving support units........................................................................ 47
13 Class survey and mobilisation period for temporary installation...... 48
14 Temporary installations being in non-compliance with optional
class notations......................................................................................48
15 Statutory and non-structural requirements to temporary
installations.......................................................................................... 48
16 Mobilization with chemicals acc. IMO resolution A.673(16)............. 50
17 DNV GL Class rules.......................................................................... 53
Section 4 Mobilisation for single voyage...............................................................57
1 General.............................................................................................. 57
Section 5 Stability................................................................................................. 58
1 Involvement by the Society............................................................... 58
2 Increased draught............................................................................. 58
3 Major conversions..............................................................................59
4 Internal modifications....................................................................... 60
5 Change in lightship particulars, additional comments........................61
6 Conversions that may have an effect on stability.............................. 61
7 Stability documentation and other formal matters............................ 62
Section 6 Load line................................................................................................64
1 Increased draught – freeboard deck not redefined............................64
2 Increased draught – freeboard deck redefined..................................64
3 Alteration of main dimensions...........................................................65
4 Alteration of - or new superstructure................................................ 65
Section 7 Life-saving appliances and COLREG and ILO crew accommodation........66
1 Life-saving appliances....................................................................... 66
2 COLREG.............................................................................................. 66
3 ILO Crew accommodation and MLC................................................... 66
Section 8 Electrical installation............................................................................. 67
1 Documentation...................................................................................67
2 New class notations...........................................................................67
3 Certification....................................................................................... 67
4 Testing............................................................................................... 67
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