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

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

1 Above Ground Storage Tanks & Tank Base Sealing

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

3 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

4 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

5 Tank Base Sealing Tank Base Construction

6 Large Storage Tanks – Typical Construction 1. Trench preparation for perimeter wall 2. Reinforced concrete containment wall 3. First sections of tank wall positioned Tank Base Sealing Tank Base Construction Large Tanks

7 4. Liner installed when required 5. Sand – bitumen foundation laid 6. Tank base installed Large Tanks Tank Base Sealing Tank Base Construction

8 7. Walls constructed 8. Roof welded in place 9. Tank completion Tank Base Sealing Tank Base Construction Large Tanks

9 1. Foundations prepared 2. Base and plinths constructed 3. Tanks installed Tank Base Sealing Tank Base Construction Small Tanks 1 2 3

10 Tank Base Sealing Problem Areas – Tank Base Corrosion of tank wall and chine angle Corrosion of tank wall and chine angle Determination seal Determination seal Corrosion of tank base Corrosion of tank base

11 Tank Base Sealing Problem Areas – Tank Base Conventional methods to seal tank base

12 Tank Base Sealing Problem Areas – Tank Base Asphalt & Bitumen Asphalt & Bitumen Mastics Mastics

13 Tank Base Sealing Problem Areas – Tank Base Bonded Rubber Bonded Rubber

14 Tank Base Sealing Problem Areas – Tank Base Steel Skirts Steel Skirts

15 - 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 Sealing Problem Areas – Tank Base

16 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 ank out of service for 3 months Tank Base Sealing Problem Areas – Tank Base

17 Storage Tank Base Associated Problems No grout or sealing measuresFailed grout Tank Base Sealing

18 Storage Tank Base Associated Problems Failed groutCracked Concrete Base Tank Base Sealing

19 Conventional wisdom states: Conventional wisdom states: Replace failed system with more of the same sealants Replace failed system with more of the same sealants Replace failed system with similar sealants Replace failed system with similar sealants Switch sealing system to other conventional sealing methods Switch sealing system to other conventional sealing methods

20 PROVEN ^ LONG TERM, COST EFFECTIVE PROVEN ^ LONG TERM, COST EFFECTIVE SOLUTIONS ARE AVAILABLE unconventional Tank Base Sealing

21 Membrane systems for long term sealing of chine angle Membrane systems for long term sealing of chine angle Epoxy grouts for concrete ring repair and grout sealing Epoxy grouts for concrete ring repair and grout sealing Urethane coatings for tank exterior Urethane coatings for tank exterior

22 Tank Base Sealing Key Features and Benefits Weatherproof & Waterproof - Prevents ingress of water and provides long term corrosion protection 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 Seamless Encapsulant – Seals around irregular contours and is easily repaired if accidentally damaged

23 Tank Base Sealing Key Features and Benefits Maintains High Adhesion – Ensuring long service life Maintains High Adhesion – Ensuring long service life Flexible & UV Resistant – Long lasting and tolerant of movement through climatic variations unlike conventional sealants Flexible & UV Resistant – Long lasting and tolerant of movement through climatic variations unlike conventional sealants Fire Resistant Systems Available Fire Resistant Systems Available

24 Tank Base Sealing Key Features and Benefits Durable & Tough – Long lasting and tolerant of industrial environments Durable & Tough – Long lasting and tolerant of industrial environments Microporous – Allows trapped moisture to escape Microporous – Allows trapped moisture to escape Cold Applied – No hot work required ensuring safety in use where fire is a concern Cold Applied – No hot work required ensuring safety in use where fire is a concern

25 Tank Inspection Requirements API 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)

26 Tank Base Sealing Additional Problem Areas No Caulk or sealing measures at all Spalled/cracked concrete around tank base Failed grout Rebuilding and protection of containment area Repair of tank base using cold plate bonding

27 Storage Tank Containment Issues Before repair/coatingAfter repair/coating

28 Tank Base Sealing Maintain environmental compliance Maintain environmental compliance Maintain asset integrity Maintain asset integrity Minimize headaches with preventative maintenance Minimize headaches with preventative maintenance

29 Questions?

30 Thank You for your time.


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