FAQ's?

What is Tank Container?

Tank is a pressure vessel of varying capacity mounted in a frame, fitted with various service equipment such as safety valves, venting, filling, discharge, heating, insulation and measuring devices which are necessary for transporting hazardous and non hazardous liquids, gases and powdery granules.

What does tank shell and tank structural mean?

Tank Shell :

'Shell' means the part of the container which retains the substance intended for carriage, including openings and their closures, but does not include service equipment or external structure equipment.

Tank structural :

'Structural equipment' for tanks of a tank-container means the external or internal reinforcing, fastening, protective or stabilizing members for holding the tank shell.

How is a tank container classified or differentiated?

IMO type 1, 2, 5, or 7 portable tanks means tanks manufacturer before 1st January 2003 in accordance with IMDG code amendment

IMO type 1

:

portable tank with pressure relief devices and Maximum Allowable Working Pressure superior or equal to 1.75 bar.

IMO type 2

:

portable tank for the transport of dangerous goods of classes 3 to 9 and MAWP superior or equal to 1 bar and inferior to 1.75 bar, dedicated transportation of some light dangerous liquids.

IMO type 5

:

portable tank for the transport of non-refrigerated liquefied gases of class 2 and equipped with depressurization devices;

IMO type 7

:

portable tank for the transport of refrigerated liquefied gases of class 2.

IM 101 portable tank

:

Portable tank designed and constructed in accordance with the requirements in Section VIII of the ASME Code and a 'MAWP' equal to or greater than 1.75 bar and less than 6.8 bar.

IM 102 portable tank

:

Portable tank designed and constructed in accordance with the requirements in Section VIII of the ASME Code and a 'MAWP' equal to or greater than 1 bar and less than 1.75 bar.

DOT 51 portable tank

:

Portable tanks designed and manufactured according the specification 51 of CFR 49. These tanks are commonly used for high pressure gas transportation.

What are the sizes or dimensions of tank container?

Dimension of the Tank Container :

All standard tank containers confirm as per below dimensions :


How are tank container classified in T codes?

T coding of tank container :
T-Code Minimum Test Pressure (Bar) Minimum equivalent Tank Shell Thickness (mm) Pressure Relief Provisions Bottom Openings Provisions

T1

1.5

6mm*

Pressure relief valve

2 shut-off devices

T2

1.5

6mm*

Pressure relief valve

3 shut-off devices

T3

2.65

6mm*

Pressure relief valve

2 shut-off devices

T4

2.65

6mm*

Pressure relief valve

3 shut-off devices

T5

2.65

6mm*

Pressure relief valve with rupture disc in series

Not allowed

T6

4

6mm*

Pressure relief valve

2 shut-off devices

T7

4

6mm*

Pressure relief valve

3 shut-off devices

T8

4

6mm*

Pressure relief valve

Not allowed

T9

4

6mm*

Pressure relief valve

Not allowed

T10

4

6mm*

Pressure relief valve with bursting disc in series

Not allowed

T11

4

6mm*

Pressure relief valve

3 shut-off devices

T11

6

6mm*

Pressure relief valve

3 shut-off devices

T12

6

6mm*

Pressure Relief valve with bursting disc in series

3 shut-off devices

T13

6

6mm*

Pressure Relief valve with bursting disc in series

Not allowed

What is 2.5 Yearly and 5 Yearly periodic testing of a tank container?

2.5 Yearly & 5 Yearly Periodic tests :

The primary purpose of these examinations is to verify that a container has not suffered any damages which would render it unfit for the multimodal transport of dangerous substances and that it can be maintained in service.

5 Yearly Periodic test : It is carried out at the interval of 5 years from the date of manufacturing or from last 5year periodic test. Following are the tests/inspections involved.

Identification of the container : The tank container should have a data plate and CSC plate as per IMDG requirements. The container number should be clearly visible on the tank on all five locations on the tank (i.e. front end, rear end ,Right hand side, Left hand side and top of the tank.


Internal Inspection : A visual inspection to check whether the internal surface does not have any pitting, dents, deep gouge marks and scratch marks. And the tank shell is fit for loading for loading of next cargo. If heavy grinding or buffing is observed then thickness measurement is to be carried out. The internal inspection should meet ITCO ACC requirements.


External Inspection : A visual inspection of the tank is carried out to check whether the structural, insulation and cladding meet ITCO ACC requirements.


Checking of service equipment

1.Pressure Relief Vacuum
2.Steam Tube
3.Rupture disc


Hydrostatic Test :


The hydrostatic test is performed on the tank at the test pressure mentioned on the data plate. The tank container is completely filled up with water. The tank is pressurized at the test pressure and is noted by the calibrated pressure gauge fitted at the top of the container. This test is carried to check the strength of the container. A visual inspection is done on the visible parts, weld joints, tank fitment area and structural fitment areas. The pressure is to be maintained as long necessary for inspection of the tank shell and welds, but not less than 30 minutes.


Pneumatic/Air Test :


The pneumatic test is performed the container at 25% of MAWP of the container. The container is filled up with gas at the pressure and is noted on by calibrated pressure gauge fitted on top of the container. This test is done to check there are no leakages from the fitments and mechanical joints of the tank container. Basically soap solution is applied on the area as mentioned to check the leakages.

2.5 Yearly Periodic test : The 2.5 yearly test has to be carried out every 2.5 year or 30 months from the date of manufacturing or last 5 yearly test. 2.5 Yearly Periodic test involves all the above inspections as in the case of 5 yearly periodic test except the hydrostatic test. The test can be carried with allowance of plus minus 3 months. But if the test is exceeding 3 months i.e. the container is not tested for 33 months. It becomes over due and compulsory tank has to undergo 5 year periodic test.

What are the regulation / approvals required to operate tank containers?

Regulations for tank container :

Main approvals for a tank-container are the following ones :


CSC : International Convention for Safe Containers, concerning the structure strength


IMO : International Maritime Organization, concerning the carriage of dangerous goods by sea


ADR : European agreement concerning the international carriage of dangerous good by road

UK-DOT : Department of Transport UNITED-KINGDOM British authority for the delivery of IMO approval according to IMDG Code and UK-DOT national Code for portable tanks and road tank vehicles for the carriage of dangerous goods

AAR 600 : Association of American Railroads.
Important : it is worth noting that under AAR rules, no hazardous cargo may be carried on the US railroads in an IMO type 2 (IM 102) tank.


TC : Transport Canada
Canadian regulation for the inland transport by rail of dangerous goods

BAM : BUNDESANSTALT FUR MATERIALFURSCHUNG UND PRUFUNG German competent authority for delivery of IMO, RID/ADR, GGVE, GGVS, GGVSee, CSC approval numbers BAM is not really an agreement but the name of an authority delivering under a single number several agreements.

What are the classes of dangerous goods?

Classes of dangerous goods :

Class 1 : Explosives

Division 1.1 : substances and articles which have a mass explosion hazard

Division 1.2 : substances and articles which have a projection hazard but not a mass explosion hazard

Division 1.3: substances and articles which have a fire hazard and either a minor blast hazard or a minor projection hazard or both, but not a mass explosion hazard

Division 1.4 : substances and articles which present no significant hazard

Division 1.5 : very insensitive substances which have a mass explosion hazard

Division 1.6 : extremely insensitive articles which do not have a mass explosion hazard


Class 2 : Gases

Class 2.1 : flammable gases

Class 2.2 : non-flammable, non-toxic gases

Class 2.3 : toxic gases


Class 3: Flammable liquids


Class 4 : Flammable solids; substances liable to spontaneous combustion;
            substances which, in contact with water, emit flammable gases

Class 4.1 : flammable solids, self-reactive substances and desensitized explosives

Class 4.2 : substances liable to spontaneous combustion

Class 4.3 : substances which, in contact with water, emit flammable gases


Class 5 : Oxidizing substances and organic peroxides

Class 5.1 : oxidizing substances

Class 5.2 : organic peroxides


Class 6 : Toxic and infectious substances

Class 6.1 : toxic substances

Class 6.2 : infectious substances

Class 7 : Radioactive material Class 8 : Corrosive substances Class 9 : Miscellaneous dangerous substances and articles

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