Question

A solid can be stored independently without the vessel​

Answer 1

Answer:

This chapter focuses on vessels used in chemical processing service. They are basically of two types, those substantially without internals and those with internals. The main functions of the first kind, also known as drums or tanks, are intermediate storage or surge of a process stream for a limited or extended period or to provide a phase separation by settling. Their sizes are established by process calculations or by general rules of thumb based on experience. The second category comprises the shells of equipment such as heat exchangers, reactors, mixers, fractionators, and other equipment whose housing can be designed and constructed largely independently of their internals. In a continuous plant, drums have a holdup of a few minutes and are located between major equipment to supply feed or accumulate product. Surge drums between equipment provide a measure of stability in that fluctuations are not transmitted along a chain of equipment, including those fluctuations that are characteristic of control instruments of normal sensitivity. Tanks are larger vessels, of several hours holdup usually. Storage tanks are regarded as outside the process battery limits and their sizes are measured inunits of the capacities of connecting transportation equipment. Liquids with high vapor pressures and liquified gases are stored in elongated horizontal vessels. Gases under highpressure may be stored in elongated horizontal vessels but often in spherical tanks. Gases at or near atmospheric pressure are stored in gas holders with floating roofs and are sealed with a liquid in a double wall built onto the holder.