ServicesOur Best Services Tank Maintenance and Refurbishment ASL Group understands the need to know that volume is key to doing business. Regular Inspections ASL Group provide tank inspection services. The most important part of maintenance is the need for regular inspections. Scheduled Cleaning ASL Group understands the importance of maintaining an oil tank with regular cleaning and inspection. Repairs and Changes If anything was noticed during the inspection and cleaning of the tank, this means repairs are going to be planned. Replacement For severe cases, a tank might need to be replaced. This usually happens if the damage is too severe or the tank is failing to meet any of the standards for fuel storage.