21.4 Criteria used to assign the minimum carriage requirements for products that meet the minimum safety or pollution criteria to make them subject to chapter 17 of the IBC Code
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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 21 Criteria for assigning carriage requirements for products subject to the IBC Code - 21.4 Criteria used to assign the minimum carriage requirements for products that meet the minimum safety or pollution criteria to make them subject to chapter 17 of the IBC Code

21.4 Criteria used to assign the minimum carriage requirements for products that meet the minimum safety or pollution criteria to make them subject to chapter 17 of the IBC Code

 21.4.1 Column a – Product name

21.4.1.1 A standardized chemical name, preferably assigned on the basis of the Chemical Abstracts Service (CAS) or the International Union of Pure and Applied Chemistry (IUPAC) system, shall be used as far as possible. However, where this is unnecessarily complex, then a technically correct and unambiguous alternative name may be used.

21.4.2 Column b – Deleted

21.4.3 Column c – Pollution category

21.4.3.1 Column c identifies the pollution category assigned to each product in accordance with MARPOL Annex II, based on table 1 below (see MARPOL Annex II, appendix I).

Table 1 – Guidelines for the categorization of Noxious Liquid Substances

Rule A1

Bio- accumulation

 A2

Bio- degradation

 B1

Acute toxicity

 B2

Chronic toxicity

 D3

Long-term health effects

 E2

Effects on marine wildlife and on benthic habitats

 Cat
1 ≥ 5 X
2 ≥ 4 4
3 NR 4
4 ≥ 4 NR CMRTNIfootnote
5 4 Y
6 3
7 2
8 ≥ 4 NR Not 0
9 ≥ 1
10 Fp, F or S If not Inorganic
11 CMRTNIfootnote
12 Any product not meeting the criteria of rules 1 to 11 and 13 Z
13 All products identified as: ≤ 2 in column A1; R in column A2; blank in column D3; not Fp, F or S (if not organic) in column E2; and 0 (zero) in all other columns of the GESAMP Hazard Profile OS

21.4.4 Column d – Hazards

21.4.4.1 An "S" is assigned to column d if any of the safety criteria described in paragraphs 21.3.1.1 to 21.3.1.11 are met.

21.4.4.2 A "P" is assigned to column d if the product meets the criteria for assigning Ship Type 1 to 3 as defined by rules 1 to 14 in the table 2.

21.4.5 Column e – Ship Type

21.4.5.1 Assignment of Ship Types is carried out from both a pollution and safety perspective. The basic criteria for assigning Ship Types from a pollution perspective is carried out based on the GESAMP Hazard Profile, shown in table 2. An explanation of the details in the columns is provided in appendix I of MARPOL Annex II.

21.4.5.2 The following criteria are used to assign the Ship Type:

  • Ship Type 1:

    • Inhalation LC50/ATE≤ 0.5 mg/L/4h (C3 = 4) and SVC/LC50 ≥ 20; and/or
    • Dermal LD50/ATE ≤ 50 mg/kg (C2 = 4); and/or
    • WRI = 3; and/or
    • Auto-ignition temperature ≤ 65℃; and/or
    • Explosive range ≥ 50% v/v in air and the flashpoint < 23°C; and/or
    • Rules 1 or 2 of the table 2 shown in 21.4.5.2 (below).

  • Ship Type 2:

    • Inhalation LC50/ATE ≤ 0.5 mg/L/4h (C3 = 4) and SVC/LC50 < 20; or
    • Inhalation LC50/ATE > 0.5 mg/L/4h – ≤ 2mg/L/4h (C3 = 3) and SVC/LC50 ≥ 2 (see note); and/or
    • Dermal LD50/ATE > 50 mg/kg – ≤ 200 mg/kg (C2 = 3); and/or WRI = 2; and/or
    • Auto-ignition temperature ≤ 200oC; and/or
    • Explosive range ≥ 40% v/v in air and the flashpoint < 23°C; and/or
    • Any product meeting the criteria of rules 3 to 10 in table 2.

    • Note: Products with a density >1025 kg/m3 (sinkers) or a water solubility of >50% (dissolvers) that are assigned to Ship Type 2 based on the inhalation toxicity criteria, may be re-assigned to Ship Type 3.

  • Ship Type 3:
    • Any of the minimum safety or pollution criteria for bulk liquid cargoes subject to chapter 17 of the IBC Code not meeting the requirements for Ship Types 1 or 2 and not meeting rule 15 of table 2 shown in 21.4.5.2 (below).

Table 2 – Assignment of Ship Types based on the GESAMP Hazard Profile

Rule A1 A2 B1 B2 D3 E2 Ship Type
1 ≥ 5 1
2 ≥ 4 NR 4 CMRTNIfootnote
3 ≥ 4 NR CMRTNIfootnote 2
4 4
5 ≥ 4 3
6 NR 3
7 ≥ 1
8 Fp
9 CMRTNIfootnote F
10 ≥ 2 S
11 ≥ 4 3
12 NR
13 ≥ 1
14 All other category Y Substances
15 All other category Z Substances All "Other Substances" (OS) NA

21.4.6 Column f – Tank type

21.4.6.1 The tank type is assigned according to the following criteria:

Tank type 1G: Inhalation LC50/ATE ≤ 0.5 mg/L/4h (C3 = 4) and SVC/LC50 ≥ 1000; and/or

Dermal LD50/ATE ≤ 50 mg/kg (C2 = 4); and/or;

WRI=3; and/or

Auto-ignition temperature ≤ 65oC; and/or

Explosive range ≥ 40% v/v in air and the flashpoint < 23oC.

Based on expert judgement, tank type 1G may be required for specific products (e.g. for molten sulphur, hydrochloric acid)

Tank type 2G: Any of the minimum safety or pollution criteria for bulk liquid cargoes subject to chapter 17 or the IBC Code not meeting the requirements for tank type 1G.

21.4.7 Column g – Tank vents

21.4.7.1 The tank venting arrangements are assigned according to the following criteria:

  • Controlled:
 Inhalation LC50/ATE ≤ 10 mg/L/4h (C3 = 2, 3 or 4), unless in accordance with 21.7.12; and/or

Toxic to mammals by prolonged exposure (D3 = C, M, R, T, N, or I); and/or

Respiratory sensitizer (D3 = Sr, see also paragraph 21.7.4); and/or

Special carriage control needed; and/or

Flashpoint ≤ 60oC; and

Corrosive to skin (≤ 4h exposure). (D1 = 3A, 3B, or 3C).
  • Open:
 Any of the minimum safety or pollution criteria for bulk liquid cargoes subject to chapter 17 or the IBC Code not meeting the requirements for controlled tank vents.

21.4.8 Column h – Tank environmental control

21.4.8.1 The tank environmental control conditions are assigned according to the following criteria:

  • Inert:
 Auto-ignition temperature ≤ 200oC; and/or Reacts with air to cause a hazard; and/or Explosive range ≥ 40% and the flashpoint < 23°C.
  • Dry:
 WRI > 1
  • Pad:
 Only applies to specific products identified on a case by case basis.
  • Vent:
 Only applies to specific products identified on a case by case basis.
  • No:
 Where the above criteria do not apply (inerting requirements may be required under SOLAS).

21.4.9 Column i – Electrical equipment

21.4.9.1 If the flashpoint of the product is ≤ 60oC or the product is heated to within 15oC of its flashpoint then the electrical equipment required are assigned according to the following criteria, otherwise "–" is assigned in column i' and i":
  • .1 Column i' – Temperature class:
    • T1 Auto-ignition temperature ≥ 450oC
      T2 Auto-ignition temperature ≥ 300oC but < 450oC
      T3 Auto-ignition temperature ≥ 200oC but < 300oC
      T4 Auto-ignition temperature ≥ 135oC but < 200oC
      T5 Auto-ignition temperature ≥ 100oC but < 135oC
      T6 Auto-ignition temperature ≥ 85oC but < 100oC

  • .2 Column i'' – Apparatus group:

    • Apparatus group MESG at 20oC (mm) MIC ratio product/methane
      IIA > 0.90 > 0.80
      IIB > 0.50 to ≤ 0.90 > 0.45 to ≤ 0.80
      IIC ≤ 0.50 ≤ 0.45

    • .1 The tests shall be carried out in accordance with the procedures described in IEC 60079-1-1:2002 and IEC 79-3.

    • .2 For gases and vapours it is sufficient to make only one determination of either the Maximum Experimental Safe Gap (MESG) or the Minimum Igniting Current (MIC) provided that:
      • for Group IIA: the MESG > 0.90 mm or the MIC ratio > 0.80
        for Group IIB: the MESG is > 0.50 mm and ≤ 0.90 mm; or

        the MIC ratio is > 0.50 and ≤ 0.80

        for Group IIC: the MESG is ≤ 0.50 mm or the MIC ratio is ≤ 0.45
    • .3 It is necessary to determine both the MESG and the MIC ratio when:

      • .1 The MIC ratio determination only has been made, and the ratio is between 0.80 and 0.90, when an MESG determination will be required;

      • .2 The MIC ratio determination only has been made, and the ratio is between 0.45 and 0.50, when an MESG determination will be required; or

      • .3 The MESG only has been found, and is between 0.50 mm and 0.55 mm, when an MIC ratio determination will be required.

  • .3 Column i"' Flashpoint:
    • > 60°C Yes
      ≤ 60°C No
      Non-flammable NF

21.4.10 Column j – Gauging

21.4.10.1 The gauging equipment is assigned according to the following criteria:

  • Closed:

    Inhalation LC50/ATE ≤ 2 mg/L/4h (C3 = 3 or 4), unless in accordance with 21.7.12; and/or

    Dermal LD50/ATE ≤ 1000 mg/kg (C2 = 2, 3 or 4); and/or

    Toxic to mammals by prolonged exposure (D3 = C, M, R, T, N, or I); and/or

    Respiratory sensitizer (D3 = Sr, see also paragraph 21.7.4); and/or Severely corrosive to skin (≤ 3 min exposure) (D1= 3C).

    Restricted:

    Inhalation LC50/ATE >2 - ≤10 mg/L/4h (C3 = 2), unless in accordance with 21.7.12; and/or

    Special carriage control indicates inerting required; and/or

    Highly corrosive to skin (> 3 min - ≤1h exposure) (D1 = 3B); and/or Flashpoint ≤ 60oC.

    Open:

    Any of the minimum safety or pollution criteria for bulk liquid cargoes subject to chapter 17 or the IBC Code not meeting the requirements for closed or restricted gauging.

21.4.11 Column k – Vapour detection

21.4.11.1 The vapour detection equipment is assigned according to the following criteria:
  • Toxic (T): Inhalation LC50/ATE ≤ 10 mg/L/4h (C3 = 2, 3, or 4), unless in accordance with 21.7.12, and/or

    Respiratory sensitizer (D3 = Sr, see also paragraph 21.7.4); and/or

    Toxic to mammals by prolonged exposure (D3 = C, M, R, T, N, or I)

    Flammable (F): Flashpoint ≤ 60oC
    No (No): Where the above criteria do not apply

21.4.12 Column l – Fire protection equipment

21.4.12.1 The appropriate fire-fighting media are defined as being appropriate according to the following criteria related to the properties of the product:
  • Solubility > 10% (> 100000 mg/L) A Alcohol-resistant foam
    Solubility ≤ 10% (≤ 100000 mg/L) A Alcohol-resistant foam; and/or
      B Regular foam
    WRI = 0 C Water spray (generally used as a coolant and can be used with A and/or B providing that the WRI = 0)
    WRI ≥1 D Dry chemical
      No No requirements under this Code. This applies where a product as identified as NF in column i''' (see paragraph 21.4.9.1.3).

    Note: all appropriate media shall be listed.

21.4.13 Column m – Deleted

21.4.14 Column n – Emergency equipment

21.4.14.1 The requirement to have personnel emergency equipment on board is identified by "Yes" in column n according to the following criteria:

  • Inhalation LC50/ATE ≤ 2 mg/L/4h (C3 = 3 or 4); unless in accordance with 21.7.12 and/or
  • Respiratory sensitizer (D3 = Sr, see also paragraph 21.7.4); and/or
  • Severely corrosive to skin (≤ 3 min exposure) (D1 = 3C); and/or
  • WRI = 2

  • No: indicates that the above criteria do not apply.

Parent topic: Chapter 21 Criteria for assigning carriage requirements for products subject to the IBC Code
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