Cleaning fuel underground tanks with “NO MAN ENTRY” technology

Underground storage tanks, also known as USTs, can be a source of fuel contamination if diligent housekeeping is not maintained. Identifying and cleaning contaminated USTs can prevent many consumer product quality problems and complaints while reducing associated costs. USTs are subject to accumulations of water and/or sediment over time. Though these contaminants are inherent in the distribution system from refineries to pipelines to terminals to service stations, service station owners are responsible for maintaining the cleanliness of their USTs. The service station UST is the final link in the supply chain presenting the last opportunity to prevent contaminants from impacting the consumer.
Contamination Sources UST contamination can arise from a number of sources. Accumulation of sediment can occur from dirt entry while tank closures are not in place – such as while a load of fuel is being dropped. Additional sediment accumulation may occur with aging as rust and other oxidation products are formed. Water from rain or melting snow on the ground can leak into the UST via the tank opening. Condensation from ambient temperature changes (Volume expansion and contraction) is another possible source of water. When water bottoms are allowed to accumulate in a UST, the opportunity for microbial contamination greatly increases. Microbial growth in an underground storage tank can be costly and laborintensive to alleviate.
A preventative maintenance schedule at a service station should include periodic inspection of tank closures and driveway conditions for proper grade for sealing. Periodic inspection and cleaning of the area surrounding the UST tank openings and should also be performed regularly. Keeping water in the UST to a minimum is a recommended best practice.
Operating liquid drawn from the contaminant tank circulates through the pump and creates a vacuum at the eductor. The vacuum draws moisture and contaminants through the cleanout hose and back to the eductor, where it mixes with the operating liquid and is carried to the contaminant tank.