Regular inspection and cleaning of water storage tanks are vital to maintain water quality in the distribution system and extend the tank’s lifespan. Regular tank inspections help identify minor issues early before they become major problems, which could lead to health risks and expensive repairs or premature tank failure. Failing to regularly clean tanks can lead to contamination events, posing risks to human health or causing aesthetic concerns.
There are two fundamental types of inspections:
- Generally, wet inspections are performed either by certified divers or remotely operated vehicles (ROVs). A wet water quality inspection is typically required by state regulations.
- Challenges encountered during wet inspections often parallel those in dry inspections. Dry inspections primarily aim to evaluate structural damage and coating thickness for steel tanks. It’s essential to recognize that dry inspections necessitate emptying the tank and taking it out of service. Dry inspections typically involve costs three times higher than wet inspections.
How Often Should a Water System Inspect and Clean Storage Tanks?
The frequency of inspections and cleanings may vary depending on the type of tank and water quality. Typically, water storage tanks should undergo inspection at least every five years, with more frequent checks if required 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 tank from any potential inspector and ensure that the report is approved by the state regulatory agency.
In preparation for the 2017 water quality regulations, it is advisable to engage inspectors capable of providing in-service temperature readings to detect stratification.
Circulation
Water is typically introduced into and drawn from the bottom of the water container through inlet and outlet piping. When the filling rate surpasses the extraction rate, the water level rises, and conversely, it decreases when the extraction rate exceeds the filling rate. If both rates remain consistent, the system withdraws the most recently added water. Due to the lack of circulation, the water at the top of the container becomes stratified and stagnant. Additionally, stagnant water may cause chlorine depletion, leading to microbial growth and the development of unpleasant tastes and odors. Integrating mixers into your tank is a common and cost-effective solution to address these issues.
Testing for Contaminants
Irrespective of the method utilized, bacteriological testing is essential before reintroducing the tank into service. The identification of coliform bacteria in post-disinfection sample testing indicates the potential presence of harmful contaminants in the water.
While water analysis helps determine whether microbes and bacteria in a water sample pose a public health risk, other contaminants are detectable within the tank. Sediments such as dirt, mud, sand, rust, and other particles may accumulate at the tank bottom, obscuring what would otherwise be a clean white surface with inches of sediment. Excessive sediment buildup can also result in clogged outlet pipes if sediment settles within them.
To discuss any of the concepts described here in more detail, our friendly and experienced customer service team can help. We offer tried and tested services around Houston, Texas and Longbeach, California.
Call Panel Tanks by American Tanks at +1 800 656 0167
Or email at info@americanpaneltanks.com
