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 For storing “Low Vapour Pressure” Products ( below 2 psi. ) Floating Roof Tanks - 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 Tank Base Construction

Tank Base Sealing Tank 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 2 2 3 3

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

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

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

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

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

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

Tank Base Sealing Problem Areas – Tank Base Bonded Rubber

Tank Base Sealing Problem Areas – Tank Base Steel Skirts

Failure of Bitumen Seal Tank Base Sealing Problem 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 Chine Angle

Tank Base Sealing Problem 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 Cost calculated using current exchange rate Plus : Tank cleaning / waste disposal costs Tank out of service for 3 months

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

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 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 Sealing Key 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

Tank Base Sealing Key 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 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

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

Storage Tank Containment Issues Before repair/coating After repair/coating

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

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