DIXON highly recommends a One Year Warranty Inspection (WI) to test the condition of the coating one year after all work is completed (labor and materials). A Warranty Inspection will include problems that may arise from defective materials. If a coating failure occurs, the contractor is responsible to correct the work at no cost to the owner. A one year maintenance bond ensures the contractor's responsibility to correct any defective work discovered at the warranty inspection. DIXON completes this inspection using high pressure water for adhesion testing.

High Pressure Cleaning

DIXON recommends high pressure cleaning during the MI to remove all the collected mud on the tank in order to detect any deterioration of the steel, and also to perform an accurate adhesion test on the remaining coating. A high pressure water source from a community fire truck or a portable pump will do the job. DIXON recommends using a hose with an adjustable nozzle for fog or a straight stream that has a 30 gallons per minute capacity.

After high pressure cleaning, DIXON provides a detailed report including photographs, budget estimates, and a Field Inspection Report (FIR), which informs contractors about the dimensions and conditions.

Chlorination

After the MI is complete, DIXON chlorinates the tank per AWWA D652 method 3. After acceptable bacteriological results are obtained.

General Recommendations

• Inspection Date: DIXON will arrange a date of inspection that is mutually agreeable. The tower will be out of service from the day it is drained, until chlorination and testing; approximately four days.
• Inspection Duration: DIXON performs an entire inspection within one day unless an excessive amount of mud is discovered.
• Sampling Tap: DIXON recommends installing a sampling tap if the tank does not have one.
• Pressure Relief Valves: Dixon can provide pressure relief valves to assist systems with only one tank in regulating pressures while the tank is out of service.