Section 1 General

101. General

1. The classification and surveys of units intended to be classed with the Society or classed with the Society are to be in accordance with the requirements specified in this Chapter.

2. In the case of items not specified in this Chapter, the requirements specified in Pt 1 of Rules for the Classification of Steel Ships are to be applied.

Section 2 Classification Survey

201. Classification

Units built and surveyed for the classification in accordance with this Guidance or in accordance with requirements deemed to be equivalent to this Guidance by the Society will be assigned a class and registered in the Register of structures.

202. Class notations

1. The class will be distinguished by the class notations and the class notations assigned to the unit classed with the Society are to be in accordance with the requirements specified in Pt 1, Ch 1,

201. of Rules for the Classification of Steel Ships. However ship type notation will be as-

signed according the purpose of unit as follows.

(1) Floating LNG Production, Storage and Offloading Unit

(2) Floating LNG Storage and Regasification Unit

2. Floating liquefied gas storage and regasification unit with a notation of 1 (2) is to have the Reagsification notation and the regasification system installed in the unit is to comply with Ch 13.

3.

4.

203.

When an existing vessel is converted to an unit, and is classed with the Society according to the requirements of this Guidance, the notation (C) shall be assigned as special feature notation. If the existing vessel being converted is currently classed with the Society with ✠. symbol, then the ✠. symbol would be maintained for the converted unit.

At the request of the Owner, the special feature notations may be assigned as followings.

(1) For units fitted with the process systems, where the whole process systems are in compliance with Ch 11, the notation Process may be assigned additionally. However, for units fitted with the process systems, even if the process systems are not intended to be classed, the devices re- lated to the safety of the process systems are to be comply with the requirements of Ch 8 and Ch 11.

(2) Where the import system or export system are in compliance with the requirements of Ch 15, the notation Import or Export may be assigned additionally.

(3) For the units that has a propulsion system and a means of disengaging the unit from its moor-

ing and riser systems, the notation Disconnectable may be assigned additionally.

Maintenance of classification

1. Units classed with the Society are to be subjected to the surveys to maintain the classification and are to be maintained in good condition in accordance with the requirements specified in this Chapter.

2. Plans and particulars of any proposed alterations to the approved scantlings or arrangements of hull, machinery or equipment are to be submitted for approval by the Society before the work is com- menced and such alterations are to be surveyed by the Surveyor of the Society.

204. Classification Survey during Construction

1. General

At the Classification Survey during Construction, the hull, machinery and equipment are to be ex- amined in detail in order to ascertain that they meet the relevant requirements of this Guidance.

2. Submission of plans and documents

(1) At the Classification Survey during Construction, the following plans and documents are to be submitted to the Society for approval before the work is commenced.

(A) Hull and hull equipment

(a)

Transverse section showing scantlings

(b) Longitudinal section showing scantlings

(c)

Deck construction plan(including details of well and helicopter deck)

(d) Framing

(e)

(f)

Shell expansion Final stability data

(g) Methods and locations for non-destructive testing

(h) Construction plan of watertight bulkheads and deep tanks indicating the highest position of tank and positions of tops of overflow pipes

(i)

(j)

Construction of superstructures and deckhouses

Details of arrangement and closing devices of watertight doors and hatchways, etc.

(k) Seatings of boilers, main engines, thrust blocks, plummer blocks, dynamos and other im- portant auxiliary machinery

(l)

Construction of machinery casings

(m) Construction of cargo handling appliances and its foundation

(n) Pumping arrangements

(o) Steering gear

(p) Construction of fire protection

(q) Means of escape

(r)

(s)

Temporary mooring arrangements and towing arrangements Welding details and procedures

(t) Details of corrosion control arrangements

(u) Documents in respect of maintenance, corrosion control and inspection

(v) Sloshing analysis

(w) Other plans and/or documents considered necessary by the Society

(B) Cargo handling systems and cargo containment systems

For cargo handling systems(cargo piping systems, cargo pumps, venting systems, inert gas

systems, etc.) and cargo containment systems, submission of plans and documents is to be in accordance with Pt 7, Ch 5, Sec 1 of the Classification of Steel Ships.

(C) Machinery

(a) Plans and data relevant to machinery installation specified in Pt 5, Ch 1, Sec 2 of

Rules for the Classification of Steel Ships.

(b) Electrical installations specified in Pt 6, Ch 1 of Rules for the Classification of

Steel Ships, and automatic and remote control system specified in Pt 6, Ch 2 of

Rules for the Classification of Steel Ships.

(c)

Fire extinguishing arrangements and inert gas system

(d) Other plans and/or documents considered necessary by the Society

(D) Site condition report

(a) Plans and data relevant to environmental condition of wave/wind/currents/tides/water depth/air, sea and ice temperature

(b) Report of seabed topography for design of anchoring systems, stablilty and pertinent ge- otechnical data

(c)

Seismic condition report

(E) Regasification systems

Submission of plans and documents for the regasification system is to be in accordance with Ch 12.

(F) Process systems

For the unit with notation Process, submission of plans and documents for the Process sys- tem is to be in accordance with Ch 13.

6 Guidance for Floating Liquefied Gas Unit 2015

(G) Loading and Offloading systems

Submission of plans and documents for the loading and offloading system is to be in ac- cordance with Ch 14.

(H) Import and Export systems

For the unit with notation Import or Export, submission of plans and documents for the im- port and export system is to be in accordance with Ch 15.

(2) At the Classification Survey during Construction, the following plans and documents are to be submitted to the Society for reference.

(A) Specifications

(B) General arrangement

(C) Summary of distributions of fixed and variable weights

(D) Plan indicating design loadings for all decks

(E) Preliminary stability data

(F) Structural analysis and calculation for relevant loading conditions

(G) Resultant forces and moments from wind, waves, current, mooring and other environmental loadings taken into account in the structural analysis

(H) Calculations for significant operational loads from main equipment

(I) Lines or offsets

(J) Capacity plans and sounding tables of tanks

(K) Plans showing arrangement of watertight compartments, openings, their closing appliances, etc., necessary for calculation of stability

(L) Plans and data specified in Pt 7, Ch 5, Sec 1 of Rules for the Classification of Steel Ships

(M) Other plans and/or documents considered necessary by the Society

Submitted calculations are to be suitably referenced. Results from relevant model tests or dynamic response calculations may be submitted as alternatives or as substantiation for the required calculations.

3. Presence of Surveyor

(1) At the Classification Survey during Construction, the presence of the Surveyor is required at the following stages of the work in relation to hull and equipment.

(A) When the tests of the materials specified in Pt 2, Ch 1 of Rules for the Classification

of Steel Ships and the equipment specified in

Steel Ships are carried out.

Pt 4 of Rules for the Classification of

(B) When the tests of welding specified in Pt 2, Ch 2 of Rules for the Classification of Steel Ships are carried out.

(C) When designated by the Society during shop work or sub-assembly.

(D) When each block is assembled and erected.

(E) When each part of the hull is completed.

(F) When structural tests, leak test, hose tests and non-destructive tests are carried out.

(G) When

performance tests are carried out on closing appliances of openings, anchoring and

mooring equipment, cargo handling appliances, fire detection systems, etc.

(H) When each part of the fire protection construction is completed.

(I) When measurement of principal dimensions, hull deflection, etc. are carried out.

(J) When a loading instrument is installed on board.

(K) When the load line mark is marked.

(L) When the onboard tests and stability experiments are carried out.

(M) When deemed necessary by the Society.

(2) At the Classification Survey during Construction, the presence of the Surveyor is required at the following stages of the work in relation to machinery.

(A) When the tests of materials of main parts of machinery specified in Pt 2 of Rules for the Classification of Steel Ships are carried out.

(B) Main parts of machinery

(a) When the tests specified in either Pt 5 or Pt 6 of Rules for the Classification of Steel Ships according to the kind of machinery are carried out.

(b) When the materials are assembled for

sembled for installation on board.

construction of the parts and the parts are as-

(c)

When machining of the main parts is

during machining.

finished and, if necessary, at appropriate stages

Guidance for Floating Liquefied Gas Units 2015 7

(d) In case of welded construction, before welding is commenced and when it is completed.

(e) When the shop trials are carried out.

(C) When main parts of machinery are installed on board.

(D) When performance tests/onboard tests are carried out on measurement instruments, remote control devices of closing appliances, remote control devices for machinery and gears, auto- matic control devices, steering gear, mooring equipment, fire extinguishing equipment, piping, etc.

(E) When deemed necessary by the Society.

4. Tests

(1) At the Classification Survey during Construction, hydrostatic tests, leak tests, hose tests and per- formance tests, etc are to be carried out in accordance with the relevant requirements of this Guidance.

(2) In the case of machinery and electrical installations related to regasification systems and the pipes and loses installed on units during off loading, hydrostatic tests, leak tests or airtight tests

are to be carried out as specified in this Guidance corresponding to the kind of machinery and electrical installations.

(3) In case where regasification systems or positioning systems, etc. are installed on board units at

works different from the shipbuilding yards where hull structures are constructed (including the sea areas of the site of operation), surveys necessary in order to tow the hull structures of units to their site of operation are to be carried out. In this cases, the tests, examinations or in- spections for the support structures of installations are to be carried out at suitable places/occa- sions before the final inspection at the site of operation.

(4) Equipment which cannot be surveyed at the Classification Survey during Construction due to special reasons that are related to such equipment only being capable of functioning after start-up and commissioning are to be identified for verification at the next Annual Survey.

5. Survey for cargo handling systems and cargo containment systems

For cargo handling systems(cargo piping systems, cargo pumps, venting etc.) and cargo containment systems, tests and surveys are to be carried

systems, inert gas systems, out in accordance with the

requirements for the cargo systems specified in Pt 7, Ch 5, Sec 4, 410. and Sec 5 of Rules for

the Classification of Steel Ships as applicable.

6. Survey for regasification Systems(if relevant notations are assigned)

Survey for regasification systems is to be in accordance with Ch 12.

7. Survey for process Systems(if relevant notations are assigned)

Survey for process systems is to be in accordance with Ch 13.

8. Survey for loading and offloading System

Survey for loading and offloading system is to be in accordance with Ch 14.

9. Survey for import and export system (if relevant notations are assigned)

Survey for loading and offloading system is to be in accordance with Ch 15.

10. Survey during the installation of units at their site of operation

In case of the survey during the installation of units at their site of operation is to be carried out

in accordance with the requirements specified in

Production Units as applicable.

11. Onboard tests and stability experiments

The onboard tests and stability experiments is to

Ch2 Sec 2 204. 8 of Guidance for Floating

be in accordance with Ch 2 Sec 2 204. 9 of

Guidance for Floating Production Units as applicable.

8 Guidance for Floating Liquefied Gas Unit 2015

205. Classification Survey after Construction

1. General

At the Classification Survey after Construction, the examination of the hull, machinery and equip- ment are carried out as required for the Special Survey corresponding to the age, kind and purpose of the unit and the actual scantlings, etc. of the main parts of the unit are to be measured as necessary.

2. Submission of plans and documents

At the Classification Survey after Construction, plans and documents as may be required for the Classification Survey during Construction are to be submitted. If plans and documents cannot be obtained, facilities are to be given for the Surveyor to take the necessary information from the unit.

3. Onboard tests and stability experiments

At the Classification Survey after Construction, onboard tests and stability experiments are to be carried out in accordance with the requirements specified in 204. 11. However, onboard tests and stability experiments may be dispensed with provided that sufficient information based on previous tests is available and neither alteration nor repair affecting onboard tests and stability experiments has been made after such previous tests.