15.14 Cargoes with a vapour pressure greater than 0.1013 MPa absolute at 37.8°C
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - International Codes - IBC Code - International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in BulkAmended by Resolution MEPC.225(64) - Chapter 15 Special requirements - 15.14 Cargoes with a vapour pressure greater than 0.1013 MPa absolute at 37.8°C

15.14 Cargoes with a vapour pressure greater than 0.1013 MPa absolute at 37.8°C

  15.14.1 For a cargo referenced in column o in the table of chapter 17 to this section, a mechanical refrigeration system shall be provided unless the cargo system is designed to withstand the vapour pressure of the cargo at 45°C. Where the cargo system is designed to withstand the vapour pressure of the cargo at 45°C, and no refrigeration system is provided, a notation shall be made in the conditions of carriage on the International Certificate of Fitness for the Carriage of Dangerous Chemicals in Bulk to indicate the required relief-valve setting for the tanks.

  15.14.2 A mechanical refrigeration system shall maintain the liquid temperature below the boiling temperature at the cargo tank design pressure.

  15.14.3 When ships operate in restricted areas and at restricted times of the year, or on voyages of limited duration, the Administration involved may agree to waive requirements for a refrigeration system. A notation of any such agreement, listing geographic area restrictions and times of the year, or voyage duration limitations, shall be included in the conditions of carriage on the International Certificate of Fitness for the Carriage of Dangerous Chemicals in Bulk.

  15.14.4 Connections shall be provided for returning expelled gases to shore during loading.

  15.14.5 Each tank shall be provided with a pressure gauge which indicates the pressure in the vapour space above the cargo.

  15.14.6 Where the cargo needs to be cooled, thermometers shall be provided at the top and bottom of each tank.

  15.14.7.1 No cargo tanks shall be more than 98% liquid-full at the reference temperature (R).

  15.14.7.2 The maximum volume (VL) of cargo to be loaded in a tank shall be:

Where
V = volume of the tank
ρR = density of cargo at the reference temperature (R)
ρL = density of cargo at the loading temperature

  15.14.7.3 The maximum allowable tank filling limits for each cargo tank shall be indicated for each loading temperature which may be applied, and for the applicable maximum reference temperature, on a list approved by the Administration. A copy of the list shall be permanently kept on board by the master.

Parent topic: Chapter 15 Special requirements
Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.