Process Design: 【One Question per Week】Week 42, 2011: Design of the density meter skid for the tank farm, and its working principle.

The basic principle of density meter measurement is to measure the degree of darkening, that is, the darkness, of the photosensitive material after exposure and development. 　　 　　 　　During plate-making, the silver bromide on the photosensitive material is exposed to light; after development, it is reduced to metallic silver, thereby creating a certain level of light resistance. Higher darkness means higher density ； Lower blackness means lower density. A meter equipped with a filter can also measure the color density of color originals. Its measurement principle is similar to the aforementioned basic principle. 　　 　　 　　A hydrometer used in physical experiments is an instrument for measuring the density of liquids. It is designed and operates based on the principle that the buoyant force acting on an object floating in a liquid is equal to its weight. A densimeter is a sealed glass tube of uneven thickness, with a small amount of lead pellets or mercury of higher density placed at its lower end. When in use, place the hydrometer vertically in the liquid whose density is to be measured. Once the hydrometer has stabilized, read the density of the liquid from its scale. 　　　　 　　There are two common types of hydrometers: one is used to measure the density of liquids with a density greater than that of pure water, and it is called a heavy gauge ； Another method for measuring liquids with a density lower than that of pure water is called light metering.

The densimeter rises or sinks depending on the changes in the balance between gravity and buoyancy. A functional hydrometer can only remain afloat; therefore, the upward force exerted by buoyancy must be slightly greater than the downward force of gravity. But at equilibrium, the magnitude of the gravity acting on it is equal to the buoyant force. 　　Since the volume of the hydrometer does not change, the volume of water it displaces remains the same. However, it becomes heavier because it contains more water. When gravity is greater than buoyancy, the densimeter sinks. The weight of the hydrometer is less than that of water of the same volume, so the hydrometer floats again. 　　The reading of the hydrometer is higher at the bottom and lower at the top; when it is immersed in different liquids, its volume remains unchanged while the reading changes. The iron sand or lead pellets at the bottom of the hydrometer are used to maintain balance! 　　A property analysis instrument for measuring fluid density. A hydrometer similar to it is an instrument for measuring the specific gravity of fluids. Density is the mass of a substance per unit volume; specific gravity is the ratio of the density of a liquid or solid to that of water, or of a gas to that of air, under specified temperature and pressure conditions. The density of water and air at certain temperatures and pressures is known; therefore, specific gravity and density can be used interchangeably under specified conditions. The density or specific gravity of a substance is related to its composition; therefore, hydrometers and specific gravimeters are commonly used to determine the quality of substances such as alcohol, petroleum products, acid and alkali solutions, gas, and natural gas. Density meters can also be used for the monitoring and control of the production and processing processes of such products.

Reply 1# crjgood: Just taking up a spot, learning* a bit

This post was last edited by crjgood on 2011-10-18 09:41. The main function of the densitometer skid is to measure the density of the medium being tested, thereby enabling oil cutting. Online sampling and measurements of other relevant physical properties can also be carried out simultaneously. It mainly includes: valves, instruments, pipelines, pumps, density meters, flow transmitters, etc. It is mainly installed on a steel frame structure.

Let’s take a look at what the content says first. . . . . . . . . . . . . . . . . . . . . .

Reply to 1# crjgood: You won’t have trouble with this question; come and learn**