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Secondary Containment

Under Tank Containment

Containment my impounding

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Performance Requirements

b. The use of electronic sensors for thedetection of vapors and liquids is acceptable;

however, the requirements of Item a above

shall be satisfied. Any such sensor shall be

fail-safe or have provision for calibration.

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Performance Requirements

c. The materials of construction shall bechemically resistant to the range of products

to be stored at the temperature range expected

in service. Other physical properties shall be

specified by the tank owner.

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Performance Requirements

d. The permeability of the leak detectionbarrier shall not exceed 1 X 107 centimeter

per second.

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Performance Requirements

e. The material in contact with thesubgrade shall be suitable for below-grade

service or be protected against degradation.

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Performance Requirements

f. The leak barrier shall be of one-piececonstruction, or the joints shall satisfy the leak

tightness, permeability, and chemical

resistance requirements for the base leak-

barrier material. The manufacturer and a

complete description of the leak barriermaterial shall be identified to the tank owner.

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Performance Requirements

g. The installation of sumps and pipesbelow the tank bottom is acceptable; however,

the required leak detection and leak tightness

shall be maintained. Refer to Figures I-8 andI-9 for typical details.

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Concrete Ringwall with Undertank Leak

Detection

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Earthen Foundation With

Undertank Leak Detection

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Double Steel Bottom With Leak

Detection

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Double Bottom Leak Detection

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Double Steel Bottom With Leak

Detection

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Typical Drawoff Sump

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Liner Installation

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Liner Installation

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Bottom Fill Installation

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Sump Installation

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Secondary Containment by

Impoundment

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Secondary Containment

NFPA 30 Flammable and CombustibleLiquids Code

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NFPA 30

The dike walls made from earth, steel,concrete, or solid masonry

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NFPA 30

Tables for

Tank Sighting

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NFPA 30

Tables for

Tank Spacing

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N t S G d

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Not So Good

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Dike Permeability

Many States require Dike Liners Clay

HDPE

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1. Extension of the containment capacity andinstallation of Diversion sheets to distribute theextinguishing agent around the tank.

2. Perimeter supply piping is installed

to distribute the extinguishing agent.

3. Vertical aeration pipesare installed.

4. Nozzle assemblies areinstalled to direct thefoam onto the diversionsheet.

5. L-Profiles to hold the heat sensingcable are installed.

6. The heat sensing cable is installed andconnected to the monitoring unit.

German Technology

I t ll ti (N l A bli )

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Installation (Nozzle Assemblies)

ll i (S l )

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Installation (Supply)

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Summary

13 Tanks have been upgraded (Germanyonly).

Equipped Tanks are in operation for 4 years. No fires

Technology just starting to be used in theUnited States