Measure and store liquid hydrocarbons

The vertical storage tank (VST) is an H₂S service vessel for storing liquid hydrocarbons after separation. The VST is used to measure liquid flow rates and the combined shrinkage and meter factor. Additional capabilities are as a second-stage separator and to hold a constant backpressure by using its automatic pressure control valve on the gas outlet.

Single- or dual-compartment versatility

The VST can be a single- or double-compartment vessel with a sight-glass or magnetic level-measuring system. The dual-compartment VST enables emptying one tank compartment while filling the other.

To prevent overpressure and overfilling, the VST is fitted with a pressure-relief valve and high- and low-level alarm system. Additional fittings are a diverter, vortex breaker, and stiffening rings that can withstand a vacuum in the vessel. Sampling, pressure, and temperature ports and a bypass manifold are included.

All VSTs are shock protected by a frame, with the latest models designed to DNV Standard 2.7-1. Operated in a vertical position, VSTs are transported in a horizontal position.