The Twister® Multi-Purpose Manway featuring a Submerged Jet Mixer (patent pending) Case Study - Twisters cleaning Asphalt Tank A major refiner used 4 Twisters to clean an asphalt tank when it was taken out to change tank service. The tank is 134’ D and had about 5,000 bbls of cold tar in the bottom (12" inches above floor), including about 2,000 bbls as a heel in the cone bottom. Cold tar is notorious for being very difficult to r

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