- A type 1 ship is a chemical tanker intended to transport chapter 17 products with very severe environmental and safety hazards which require maximum preventive measures to preclude an escape of such cargo.
- A type 2 ship is a chemical tanker intended to transport chapter 17 products with appreciably severe environmental and safety hazards which require significant preventive measures to preclude an escape of such cargo.
- A type 3 ship is a chemical tanker intended to transport chapter 17 products with sufficiently severe environmental and safety hazards which require a moderate degree of containment to increase survival capability in a damaged condition.
Thus a type 1 ship is a chemical tanker intended for the transportation or products considered to present the greatest overall hazard and type 2 and type 3 for products of progressively lesser hazards. Accordingly, a type 1 ship should survive the most severe standard of damage and its cargo tanks should be located at the maximum prescribed distance inboard from the shell plating.
If a ship is intended to carry more than one product having the most stringent ship type requirement. The requirement for the location of individual cargo tanks, however, are those for ship types related to the respective products intended to be carried.
What is Chapter 17?
Chapter 17- Summary of minimum requirements
Mixtures of noxious liquid substances presenting pollution hazards only, and which are provisionally assessed under regulation 3(4) of Annex II of MARPOL 73/78, may be carried under the requirements of Code applicable to the appropriate of the entry in this chapter for "noxious liquid, not otherwise specified".
Product name Specify the name of the product
Pollution category The number relating to each product as recommedations proposed by the United Nations Committee of Experts on the Transport of Danferous Goods.
Hazards "S" means that the product is included in the Code because of its safety hazards;
"P" means that the product is included in the Code because of its pollution hazards; and
"S/P" means that the product is included in the Code because of both its safety and pollution hazards.
Ship type 1= ship type 1
2= ship type 2
3= ship type 3
Tank type 1= independent tank
2= intergral tank
G= gravity tank
P= pressure tank
Tank vents Open: open venting
Cont.: controlled venting
SR: safety relief valve
Tank environmental Inert: inerting
control Pad: liquid or gas padding
Vent: natural or forced ventilation
Electrical equipment T1 to T6: temperature classes
IIA, IIB or IIC: apparatus groups
NF: nonflammable product
Yes: flashpoint exceeding 60'c
No: flashpoint not exceeding 60'c
Gauging O: open gauging
R: restricted gauging
C: closed gauging
I: indirect gauging
Vapour detection F: Flammable vapours
T: toxic vapours
Fire protection A: alcohol-resistant foam or multi- purpose foam
B: regular foam; encompasses all foams that are not of an alcohol-resistant type, including fluoro-protein and aqueous- film forming foam(AFFF)
No: no special requirements under this code
Materials of construction N
A blank indicates no special guidance given for materials of construction.
Respiratory and eye E
protection No: no special requirements under this code
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