Abstract: A tank system for capturing fluids from an oil or gas well. The system comprises a trailer, a tank body supported on the trailer, a separator supported on the trailer, and a sand trap supported on the trailer. The tank includes a gas buster line and a flare line. The tank body has a main inlet port at a top of the tank body and a vent port on a top of the tank body. The gas buster line is disposed in the tank body and is connected to the main inlet port. The gas buster line has multiple lengths of pipe sections, each pipe section increasing in length and diameter. The last section of the gas buster is characterized by a plurality of slots cut in a circumference of the pipe section to allow fluids in the gas buster line to disperse into the tank. The flare line is operatively connected to the vent port and includes an igniter to burn gases before they are vented to the atmosphere. The sand trap and the separator can be used as conditions require to treat fluids from a well before the fluids enter the tank.