Instrumentation
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Construction and Classification of Ships for the Carriage of Liquid Chemicals in Bulk, July 2022 - The Rules and Regulations for the Construction and Classification of Liquid Chemicals in Bulk - Instrumentation

Instrumentation

Parent topic: The Rules and Regulations for the Construction and Classification of Liquid Chemicals in Bulk

13.1 Gauging

13.1.1 Cargo tanks shall be fitted with one of the following types of gauging devices:

  1. Open device: which makes use of an opening in the tanks and may expose the gauger to the cargo or its vapour. An example of this is the ullage opening.

  2. Restricted device: which penetrates the tank and which, when in use, permits a small quantity of cargo vapour or liquid to be exposed to the atmosphere. When not in use, the device is completely closed. The design shall ensure that no dangerous escape of tank contents (liquid or spray) can take place in opening the device.

  3. Closed device: which penetrates the tank, but which is part of a closed system and keeps tank contents from being released. Examples are the float-type systems, electronic probe, magnetic probe and protected sight-glass. Alternatively, an indirect device which does not penetrate the tank shell and which is independent of the tank may be used. Examples are weighing of cargo, pipe flow meter.

13.1.2 Gauging devices shall be independent of the equipment required under Ch 1, 15.19 Overflow control.

13.1.3 Open gauging and restricted gauging shall be allowed only where:

  1. open venting is allowed by the Code; or

  2. means are provided for relieving tank pressure before the gauge is operated.

13.1.4 Types of gauging for individual products are shown in column j in the table of chapter 17.

13.2 Vapour detection

13.2.1 Ships carrying toxic or flammable products or both shall be equipped with at least two instruments designed and calibrated for testing for the specific vapours in question. If such instruments are not capable of testing for both toxic concentrations and flammable concentrations, then two separate sets of instruments shall be provided.

13.2.2 Vapour-detection instruments may be portable or fixed. If a fixed system is installed, at least one portable instrument shall be provided.

13.2.3 When toxic-vapour-detection equipment is not available for some products which require such detection, as indicated in column k in the table of chapter 17, the Administration may exempt the ship from the requirement, provided an appropriate entry is made on the International Certificate of Fitness for the Carriage of Dangerous Chemicals in Bulk. When granting such an exemption, the Administration shall recognize the necessity for additional breathing-air supply and an entry shall be made on the International Certificate of Fitness for the Carriage of Dangerous Chemicals in Bulk drawing attention to the provisions of Ch 1, 14.2 Safety equipment 14.2.4 and Ch 1, 16.4 Opening of and entry into cargo tanks 16.4.2.(b).

LR 13.2(a) Where LR is not authorised to issue an International Certificate of Fitness, the necessity for additional breathing air supply will be specially considered.

13.2.4 Vapour-detection requirements for individual products are shown in column k in the table of chapter 17.

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