Regular inspection and cleaning of water storage tanks are vital to maintain water quality within the distribution system and extend the tank’s longevity. Consistent tank inspections help detect minor issues early, preventing them from becoming major problems that could pose health risks or cause costly repairs or premature tank failure. Failure to regularly clean tanks can result in contamination events, jeopardizing human health or leading to aesthetic issues.
Understanding the Fundamentals: Two Core Categories of Inspections
- Normally, wet inspections are carried out either by certified divers or remotely operated vehicles (ROVs). A wet water quality inspection is typically required by the state.
- Challenges encountered during wet inspections often correspond to difficulties encountered during dry inspections. Dry inspections are mainly performed to evaluate structural damage and coating thickness for steel tanks. It should be emphasized that dry inspections necessitate draining the tank and taking it out of service. Dry inspections typically entail three times the expense of wet inspections.
Recommended Schedule: Water Storage Tank Inspection and Cleaning Frequency
The frequency of inspections and cleanings may vary depending on the type of tank and water quality. Generally, water storage tanks should undergo inspection at least every five years, with more frequent checks required if mandated by state regulations. Cleaning and repairs should be conducted based on the findings of these inspections, with additional checks recommended between scheduled maintenance intervals.
In most states, tank inspectors do not hold certifications. It is recommended to request a standardized report specific to the particular tank from any potential inspector and ensure that the report meets the approval of the state regulatory agency.
In anticipation of the 2017 water quality regulations, it is advisable to engage inspectors capable of providing in-service temperature readings to detect stratification.
Removal of Waste Products
Water typically enters and exits the water container through inlet and outlet piping located at the bottom. When the rate of filling surpasses that of extraction, the water level rises, and vice versa, it decreases when extraction exceeds filling. If both rates remain constant, the system withdraws the recently added water. Because there is no circulation, the water at the top of the container becomes stratified and stagnant. Additionally, stagnant water can lead to chlorine depletion, promoting microbial growth and causing unpleasant tastes and odors. Incorporating mixers into your tank is a widely used and economical solution to address these concerns.
Identifying Impurities: the Importance of Contaminant Testing
Regardless of the method used, it’s essential to conduct bacteriological testing before returning the tank to service. The presence of coliform bacteria in post-disinfection sample testing indicates potential harmful contaminants in the water.
While water analysis helps identify whether microbes and bacteria in a water sample pose a public health risk, other contaminants may be present within the tank. Sediment such as dirt, mud, sand, rust, and other particles can accumulate at the tank bottom, covering what would otherwise be a clean white surface with inches of sediment. Excessive sediment accumulation can also result in clogged outlet pipes if sediment settles in them.
For further discussion on any of the concepts mentioned here, our friendly and experienced customer service team is available to assist you. We provide reliable services in Houston, Texas, and Longbeach, California.
Call Tanks Liners by American Tanks at +1 800 656 0167
Or email at info@americantankliners.com
