Advantages in using the patented “Watson Air Lift®” Technology


A.R. Watson, Group has been safely and successfully lifting Above Ground Storage Tanks (AST) for 37 years. Over this period of time A.R. Watson has continually modified its Engineering and updated its lifting procedures with the latest technology while always focusing on our clients concerns for cost and safety.
~European EEMUA Publication No159: 2003 3rd Edition Appendix “C”. Typical repair solutions recommend tank jacking.~

Some of the major benefits to using A.R. Watson are:

  • Tank can be lifted completely externally

  • All internal fixtures can remain in place

  • No limit in size

  • Lifting equipment is portable

  • 80 Ft. (24m) diameter tank lifted 8ft (2m) in a day

  • 100% under floor visual inspection

  • Correction of the tank rim settlement

  • Repair/replacement of tank floor plates

  • Restore/change the tank floor profile

  • Reconstruct tank foundation

  • Repair concrete ring walls

  • Install cathodic protection

  • Install containment membranes

  • Inspect underside of the tank floor

  • Safely repair leaking tanks

  • Correct drainage problems

Tank lifting technology is now widely accepted and it meets all the industry codes, standards and recommended practices.

All work is completed only after thorough professional engineering evaluations are performed and are accomplished with very conservative safety factors built in.

Calculations are in accordance with:

  • Local codes and practices
    • Knowledge of the tank’s original construction
    • American Petroleum Institute tank construction standards and details
    • Local wind conditions
  • Tank Stress
    • Maximum air bag pressure
    • Calculated floor sag
    • Required number of perimeter supports
    • Maximum floor stress at center of floor
  • Foundation load
    • Proven ground bearing pressure and shear strength
    • Minimum number of tank supports
  • Wind velocity
    • Skidding
    • Tank overturning
  • Storm Anchors
    • May be required when increasing the lowest wind velocity