Vertical surge tank is an H2S service vessel designed to store liquid hydrocarbons after separation. The surge tank is used to measure liquid flow rates, as well as the combined shrinkage and meter factor. It can also be used as a second stage separator and hold a constant backpressure by using its automatic pressure control valve on the gas outlet. The surge tank usually consists of a single or double compartment vessel and a level measuring system with sight glasses or magnetic levels. To prevent overpressure and overfilling, the surge tank is fitted with a pressure-relief valve and a high- and low level alarm system. Surge tanks are designed with a diverter, a vortex breaker, and stiffening rings capable of withstanding a vacuum in the vessel. They are fitted with sampling, pressure, and temperature ports. A bypass manifold is also included. All surge tanks are shock-protected by a frame, and operate in the vertical position, even they are transported in a horizontal position.
Applications Onshore and offshore exploration and development oil and gas well testing Production wells Features Single or dual compartment Dual-compartment surge tank provide a means to empty one tank compartment while filling another Sight glasses or magnetic level indicators High- and low-level alarm on each compartment Automatic pressure-control valve normally open on gas outlets Diverter, vortex breaker, and stiffening rings Bypass manifold allows isolating surge tank from flow process Fitted with sampling points and pressure and temperature ports Protected against overpressure by relief valves Shock-protected by a frame Compliant with ASME VIII, Div. 1 and NACE MR0175