Regular examination and maintenance of water storage tanks are imperative to maintain water quality within the distribution system and extend the tank’s lifespan. Consistent tank inspections help identify minor issues early on, preventing them from developing into major problems that could pose health risks or lead to expensive repairs or premature tank failure. Neglecting regular tank cleaning can result in contamination events, risking human health or causing aesthetic issues.
There are Two Primary Types of Inspection:
- Typically, wet inspections are carried out either by certified divers or remotely operated vehicles (ROVs). A wet water quality inspection is usually required by state regulations.
- Issues identified during wet inspections often present challenges during dry inspections. Dry inspections are mainly conducted to evaluate structural damage and coating thickness for steel tanks. It’s important to note that dry inspections necessitate emptying the tank and taking it out of service. Dry inspections typically incur three times the cost of wet inspections.
How often Should Water Storage Tanks in a Water System be Inspected and Cleaned?
The frequency of inspections and cleanings may vary depending on the type of tank and water quality. Generally, water storage tanks should be inspected 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 require certification. It’s recommended to request a standardized report tailored to the specific tank from any potential inspector and ensure that the report is approved by the state regulatory agency.
In anticipation of the 2017 water quality regulations, it’s advisable to enlist inspectors capable of providing in-service temperature readings to identify stratification.
Circulation
Water is typically introduced into and drawn from the bottom of the water container using 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 steady, the system removes the most recently added water. Since there is no circulation, the water at the top of the container becomes stratified and motionless. Additionally, stagnant water may lead to chlorine depletion, fostering microbial growth and causing unpleasant tastes and odors. Installing mixers in your tank is a widely adopted and economical solution to address these concerns.
Contaminant Detection
Irrespective of the approach taken, bacteriological testing is imperative before the tank can be returned to service. The presence of coliform bacteria in post-disinfection sample testing suggests the potential existence of harmful contaminants in the water.
While water analysis aids in determining whether microbes and bacteria in a water sample pose a public health hazard, other contaminants can be detected within the tank. Sediment, including dirt, mud, sand, rust, and other particles, may accumulate at the tank bottom, masking what would otherwise be a clean white surface with layers of sediment. Excessive sediment buildup can also result in clogged outlet pipes if sediment settles in them.
For further discussion on any of the topics mentioned above, our helpful and knowledgeable customer service team is available. We provide reliable and proven services in Houston, Texas, and Long Beach, California.
Call Tank Inspections Vegas by American Tanks at +1 800 656 0167
Or email at info@tankinspections.vegas
