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

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Above Ground Storage Tanks & Tank Base Sealing

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Above ground storage tanks tank base sealing

Above Ground Storage Tanks &

Tank Base Sealing


Above ground storage tanks tank base sealing

Tank Base Sealing Types of Tank

Fixed Roof Tanks

  • - Least Expensive to construct

  • For storing “Low Vapour Pressure”

  • Products ( below 2 psi. )


Above ground storage tanks tank base sealing

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


Above ground storage tanks tank base sealing

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 tank base construction

Tank Base SealingTank Base Construction


Tank base sealing tank base construction1

Tank Base SealingTank Base Construction

Large Tanks

1. Trench preparation for perimeter wall

2. Reinforced concrete containment wall

1

3. First sections of tank wall positioned

Large Storage Tanks – Typical Construction

3

2

2

3


Above ground storage tanks tank base sealing

4

6

5

Tank Base SealingTank Base Construction

Large Tanks

4. Liner installed when required

5. Sand – bitumen foundation laid

6. Tank base installed


Above ground storage tanks tank base sealing

Tank Base SealingTank Base Construction

Large Tanks

7. Walls constructed

8. Roof welded in place

7

9. Tank completion

9

8

9

8


Above ground storage tanks tank base sealing

Tank Base SealingTank Base Construction

Small Tanks

1. Foundations prepared

2. Base and plinths constructed

1

3. Tanks installed

3

2


Above ground storage tanks tank base sealing

Tank Base SealingProblem Areas – Tank Base

  • Corrosion of tank wall and chine angle

  • Determination seal

  • Corrosion of tank base


Above ground storage tanks tank base sealing

Tank Base SealingProblem Areas – Tank Base

Conventional methods to seal tank base


Above ground storage tanks tank base sealing

Tank Base SealingProblem Areas – Tank Base

  • Mastics

  • Asphalt & Bitumen


Above ground storage tanks tank base sealing

Tank Base SealingProblem Areas – Tank Base

  • Bonded Rubber


Above ground storage tanks tank base sealing

Tank Base SealingProblem Areas – Tank Base

  • Steel Skirts


Above ground storage tanks tank base sealing

Chine Angle

Tank Base SealingProblem Areas – Tank Base

Corrosion at the Chine Angle

  • Failure of Bitumen Seal

- 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 needs to be lifted up


Above ground storage tanks tank base sealing

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 conducted

  • Approx. 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


Above ground storage tanks tank base sealing

Tank Base Sealing

Storage Tank Base Associated Problems

No grout or sealing measures

Failed grout


Storage tank base associated problems

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


Above ground storage tanks tank base sealing

Tank Base Sealing

unconventional

PROVEN ^ LONG TERM, COST EFFECTIVE

SOLUTIONS ARE AVAILABLE


Tank base sealing1

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 sealing key features and benefits

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


Above ground storage tanks tank base sealing

Tank Base SealingKey Features and Benefits

  • Maintains High Adhesion – Ensuring long service life

  • Fire Resistant Systems Available

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


Above ground storage tanks tank base sealing

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


Above ground storage tanks tank base sealing

Tank Inspection Requirements

API 653 ( American Petroleum Institute )

BS 2654 ( British Standard )

EEMUA 159 ( Engineering an Equipment

Materials Users Association )

PA DEP 245 (Department of Environmental Protection)

Requirement for all Tank users to

Inspect and ensure integrity of

their Structures

Frequency :

1 Year visual / 5 Year integral


Above ground storage tanks tank base sealing

Storage Tank Containment Issues

Before repair/coating

After repair/coating


Tank base sealing2

Tank Base Sealing

Maintain environmental compliance

Maintain asset integrity

Minimize headaches with preventative maintenance


Questions

Questions?


Above ground storage tanks tank base sealing

Thank You

for your time.


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