The United Nations International Maritime Organization (IMO) and its International Maritime Dangerous Goods (IMDG) classify such tanks into the following categories:

　　(1) IMO 0 type

　　Non-dangerous goods, non-toxic and non-corrosive goods with a flash point above 61 °C, goods other than the international enforcement agency embargo list, liquid food, but alcoholic beverages with a flash point of over 21 ° C or an alcohol content of more than 25% It should be shipped in IMO Type 1 tank and discharged from the bottom of the tank.

　　(2) IMO Type 1

　　Dangerous cargo tanks, with a maximum permissible working pressure of 1.75 bar or more, liquid chemicals with a flash point below 0 °C, certain toxic or highly corrosive chemicals, pyrophoric cargoes, goods that are dangerous if wet, Self-oxidizing cargo, liquid cargo with a sealing pressure not exceeding the allowable pressure of the tank, for tanks carrying corrosive and non-stable cargoes, shall be constructed of special steel and consider the necessary lining, tank at 65"C The internal water vapor pressure and the resulting partial pressures of 0.35 kg/cm2 are not allowed to exceed the design pressure of the tank, and the material can be discharged from the bottom of the tank or the top of the tank.

　　(3) IMO 2 type

　　Sub-hazardous cargo tanks with a maximum allowable working pressure of more than 1.0 bar and less than 1.75 bar, a liquid cargo with a flash point of 0 ° C to 61 ° C and no other hazards, certain hazardous, toxic or less corrosive chemicals The liquid cargo with a sealing pressure lower than 172.4 kPa but not exceeding the allowable working pressure of the tank shall be discharged from the bottom of the tank.

　　(4) IMO Type 4

　　A road tanker with a Type 1 or Type 2 box.

　　(5) IMO Type 5

　　Liquid gas tank for the shipment of non-refrigerated liquefied gases or less dangerous ambient chemicals, discharged from the bottom of the tank.

　　(6) IMO 6 type

　　A road tanker with a type 5 box.

　　(7) IMO Type 7

　　A refrigerated liquid gas tank with insulation, which carries refrigerated liquefied gas or low temperature liquefied gas and liquid perishable goods that require temperature control, and is discharged from the bottom of the tank.

　　(8) IMO Type 8

　　A road tanker with a 7-box.

　　The movable tank guide is intended for dangerous goods that are allowed to be transported in removable tanks. Each movable tank guide is made up of English letters T and Arabic numerals (T1 to -175). Each guide represents a technical specification.