Clasification Society Rulefinder 2016 - Version 9.25
Clasification Society Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, January 2016 - Part 11 PRODUCTION, STORAGE AND OFFLOADING OF LIQUEFIED GASES IN BULK - Chapter 18 Operating Requirements - Section 2 Storage and transfer

Section 2 Storage and transfer

Parent topic: Chapter 18 Operating Requirements

2.1 Product suitability

2.1.1 The Operator shall ascertain that the quantity and characteristics of each product to be loaded are within the limits indicated in the Loading and Stability Information booklet provided for in Pt 11, Ch 2, 1.2 Freeboard and stability 1.2.5.

2.1.2 Care should be taken to avoid dangerous chemical reactions if cargoes are mixed. This is of particular significance in respect of:
  1. tank cleaning procedures required between successive cargoes in the same tank; and
  2. simultaneous storage of cargoes that react when mixed. This shall be permitted only if the complete cargo systems including, but not limited to, cargo pipework, tanks, vent systems and refrigeration systems, are separated as defined in Pt 11, Ch 1, 1.3 Definitions 1.3.1.

2.2 Storage of cargo at low temperature

2.2.1 When carrying cargoes at low temperatures:
  1. the cool-down procedure laid down for that particular tank, piping and ancillary equipment shall be followed closely.
  2. loading shall be carried out in such a manner as to ensure that design temperature gradients are not exceeded in any cargo tank, piping or other ancillary equipment.
  3. if provided, the heating arrangements associated with the cargo containment systems shall be operated in such a manner as to ensure that the temperature of the hull structure does not fall below that for which the material is designed.

2.3 Cargo transfer operations

2.3.1 A pre cargo operations meeting shall take place between shuttle tanker personnel and the persons responsible at the transfer facility of the ship unit. Information exchanged shall include the details of the intended cargo transfer operations and emergency procedures. A recognised industry checklist shall be completed for the intended cargo transfer and effective communications shall be maintained throughout the operation.

2.3.2 Essential cargo handling controls and alarms shall be checked and tested prior to cargo transfer operations.

2.4 Cargo sampling

2.4.1 Any cargo sampling shall be conducted under the supervision of an Officer who shall ensure that protective clothing appropriate to the hazards of the cargo is used by everyone involved in the operation.

2.4.2 When taking liquid cargo samples the Officer shall ensure that the sampling equipment is suitable for the temperatures and pressures involved, including cargo pump discharge pressure if relevant.

2.4.3 The Officer shall ensure that any cargo sample equipment used is connected properly to avoid any cargo leakage.

2.4.4 After sampling operations are completed, the Officer shall ensure that any sample valves used are closed properly and the connections used are correctly blanked.

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