Above Ground Storage Tanks & Tank Base Sealing. - Least Expensive to construct - For storing “Low Vapour Pressure” Products ( below 2 psi. ) Fixed Roof.

Above Ground Storage Tanks &Tank Base Sealing

- Least Expensive to construct- For storing “Low Vapour Pressure” Products ( below 2 psi. )

Fixed Roof Tanks

Tank Base Sealing Types of Tank

Floating Roof Tanks

Fixed Roof Tanks- Least Expensive to construct- For storing “Low Vapour Pressure” Products ( below 2 psi. )

- To prevent evaporation loss- More expensive to build and maintain

Tank Base Sealing Types of Tank

Fixed Roof Tanks- Least Expensive to construct- For storing “Low Vapour Pressure” Products ( below 2 psi. )

Floating Roof Tanks- To prevent evaporation loss- More expensive to build and maintain

Silos- Ash (Fly ash)- Used for Storing “dry” products- Variety of construction materials

Tank Base Sealing Types of Tank

Tank Base SealingTank Base Construction

Large Storage Tanks – Typical Construction

1. Trench preparation for perimeter wall

2. Reinforced concrete containment wall

3. First sections of tank wall positioned

2 3

1

2 3

Tank Base SealingTank Base Construction

Large Tanks

4. Liner installed when required

5. Sand – bitumen foundation laid

6. Tank base installed 4

5 6

Large Tanks

Tank Base SealingTank Base Construction

7. Walls constructed

8. Roof welded in place

9. Tank completion 7

8 98 9

Tank Base SealingTank Base Construction

Large Tanks

1. Foundations prepared

2. Base and plinths constructed

3. Tanks installed

Tank Base SealingTank Base Construction

Small Tanks

1

2 3

Tank Base SealingProblem Areas – Tank Base

Corrosion of tank wall and chine angle

Determination seal

Corrosion of tank base

Tank Base SealingProblem Areas – Tank Base

Conventional methods to seal

tank base

Tank Base SealingProblem Areas – Tank Base

Asphalt & Bitumen

Mastics

Tank Base SealingProblem Areas – Tank Base

Bonded Rubber

Tank Base SealingProblem Areas – Tank Base

Steel Skirts

- Tank needs to be lifted up

Chine Angle

- Failure of Bitumen Seal

Corrosion at the Chine Angle

- Corrosion of wall / base / metal thinning- Contents to be emptied- Tank requires to be gas free – man entry- Sludge needs to be removed / disposed of

Tank Base SealingProblem Areas – Tank Base

Corrosion at the Chine Angle- Tank needs to be cut open for plate entry- New base needs to be built- Base welded into position- Hydro Test needs to be conductedApprox. Costs ( 90 foot tank )- $40,000 for cutting and entry / base removal- $8,000 for sand-bit floor screed replacement- $10,000 for flexible liner- $40,000 for new bottom plates- $100,000 for inspection and Hydro Test-------------- $198,000

Plus :- Tank cleaning / waste disposal costs- Tank out of service for 3 months

Tank Base SealingProblem Areas – Tank Base

Storage Tank Base Associated Problems

No grout or sealing measures Failed grout

Tank Base Sealing

Storage Tank Base Associated Problems

Failed grout Cracked Concrete Base

Tank Base Sealing

Tank Base Sealing

Conventional wisdom states: Replace failed system with more of

the same sealants Replace failed system with similar

sealants Switch sealing system to other

conventional sealing methods

PROVEN ^ LONG TERM, COST EFFECTIVE

SOLUTIONS ARE AVAILABLE

unconventional

Tank Base Sealing

Tank Base Sealing

Membrane systems for long term sealing of chine angle

Epoxy grouts for concrete ring repair and grout sealing

Urethane coatings for tank exterior

Tank Base SealingKey Features and Benefits

Weatherproof & Waterproof - Prevents ingress of water and provides long term corrosion protection

Seamless Encapsulant – Seals around irregular contours and is easily repaired if accidentally damaged

Tank Base SealingKey Features and Benefits

Maintains High Adhesion – Ensuring long service life

Flexible & UV Resistant – Long lasting and tolerant of movement through climatic variations unlike conventional sealants

Fire Resistant Systems Available

Tank Base SealingKey Features and Benefits

Durable & Tough – Long lasting and tolerant of industrial environments

Microporous – Allows trapped moisture to escape

Cold Applied – No hot work required ensuring safety in use where fire is a concern

Tank Inspection RequirementsAPI 653 ( American Petroleum Institute )

BS 2654 ( British Standard )

EEMUA 159 ( Engineering an Equipment Materials Users Association )

Requirement for all Tank users to Inspect and ensure integrity of their Structures

Frequency :1 Year visual / 5 Year integral

PA DEP 245 (Department of Environmental Protection)

Storage Tank Containment Issues

Before repair/coating After repair/coating

Tank Base Sealing

Maintain environmental compliance Maintain asset integrity Minimize headaches with

preventative maintenance

Questions?

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