3　Basic Requirements

3.1　Types of Storage Tanks

3.1.1　A low temperature steel storage tank may be a single containment tank，a double containment tank or a full containment tank.

3.1.2　A single containment tank may be a single containment tank without outer shell（Figure 3.1.2-1）or a single containment tank with outer shell（Figure 3.1.2-2）.

Figure 3.1.2-1　Single containment tank without outer shell

1-Foundation heating system；2-Foundation；3-Bottom insulation；4-Primary container（steel）；5-Flexible insulating seal；6-Suspended roo（finsulated）；7-Roo（fsteel）；8-External shell insulation；9-External water vapour barrier；10-Bund wall

Figure 3.1.2-2　Single containment tank with outer shell

1-Foundation heating system；2-Foundation；3-Bottom insulation；4-Primary container（steel）；5-Flexible insulating seal；6-Suspended roof（insulated）；7-Roof（steel）；8-Lose fill insulation；9-Outer shell（steel）；10-Bund wall

3.1.3　A double containment tank may consist of a primary container and a secondary steel container（Figure 3.1.3-1）or a primary container and a secondary concrete container（Figure 3.1.3-2）.The annular space，between the primary and secondary containers，should not be more than 6.0m.

3.1.4　A full containment tank may consist of a primary container and a secondary steel container（Figure 3.1.4-1）or a primary container and a secondary concrete container（Figure 3.1.4-2）.The annular space，between the primary and secondary containers，should not be more than 2.0m.

Figure 3.1.3-1　Double containment tank with secondary steel container

1-Foundation heating system；2-Foundation；3-Bottom insulation；4-Secondary container（steel）；5-Primary container（steel）；6-Flexible insulating seal；7-Suspended roo（finsulated）；8-Roo（fsteel）；9-Cover（rain shield）；10-External insulation；11-External water vapour barrier

Figure 3.1.3-2　Double containment tank with secondary pre-stressed concrete container

1-Foundation heating system；2-Foundation；3-Bottom insulation；4-Secondary container（concrete）；5-Primary container（steel）；6-Flexible insulating seal；7-Suspended roof（insulated）；8-Roof（steel）；9-Cover（rain shield）；10-Lose fill insulation；11-Outer shell（steel）

Figure 3.1.4-1　Full containment tank with secondary steel container

1-Foundation heating system；2-Foundation；3-Bottom insulation；4-Secondary container（steel）；5-Primary container（steel）；6-Flexible insulating seal；7-Suspended roof（insulated）；8-Roof（steel）；9-Loose fill insulation

Figure 3.1.4-2　Full containment tank with secondary pre-stressed concrete container

1-Foundation heating system；2-Foundation；3-Bottom insulation；4-Primary container（steel）；5-Flexible insulating seal；6-Suspended roof（insulated）；7-Roof（concrete）；8-Insulation on inside of pre-stressed concrete outer tank；9-Secondary container（concrete）

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GB/T 50938-2013 石油化工鋼制低溫儲罐技術規范（英文版）

3 Basic Requirements

3.1 Types of Storage Tanks

3　Basic Requirements

3.1　Types of Storage Tanks