Petroleum products HS code insights

List of the catalog of this article:

• 1,Petroleum products HS code insightsNoun Explanation of System Pressure
• 2, What does the pressure of the ventilation system mean
• 3, example of system pressure

Noun explanation of system pressure

for reference, - Rated pressure: refers to the maximum design pressure that a valve or hydraulic component can withstand, usually expressed in Mpa. - Work Pressure: refers to the pressure on the valve when the hydraulic system is working normally. It should be within the rated pressure range, otherwise it may have an adverse impact on the system.

The explanation of the stress noun is as follows: Stress is a cognitive and behavioral experience process composed of psychological stress sources and psychological stress responses. Group pressure is a kind of psychological coercive force formed by a group with the help of the power of norms to its members to achieve a restraining effect on their behavior.

[Answer]: One refers to those events or environmental stimuli that make people feel nervous;The second refers to a physical and mental reaction; the third is a process.

Blood pressure (BP) refers to the lateral pressure acting on the blood vessel wall per unit area when the blood flows in the blood vessel. It is the driving force that drives the blood to flow in the blood vessel. In different blood vessels, they are called arterial blood pressure, capillary pressure and venous blood pressure respectively. Blood pressure usually refers to the arterial blood pressure of body circulation.

The focus of the examination is: liquidation (liquidation) hypothesis refers to the fact that the asset owner is forced to sell in the open market in the form of negotiation or auction under certain pressure.

The working pressure of the hydraulic system increases with the increase of the external load. When the system pressure adjustment value is reached, the safety valve overflows and unloads! The working pressure of the hydraulic system depends on the weight of the load and the force area of the executive component.If the force area of the executive component is limited, the weight of the load is directly proportional to the working pressure.

What does the pressure of the ventilation system mean

1. It is to make air flow in the well lane, A force equal to the size of the ventilation resistance and in the opposite direction must be applied, that is, the ventilation pressure.It is a term for mechanical engineering published in 2013. It is the difference between the hysteresis pressure of the outlet section of the ventilator and the hysteresis of the inlet section of the ventilator.

2. Including pipeline resistance, equipment resistance, elbow resistance loss, and set resistance after the operation of the dust collector. The total pressure refers to the pressure from the vacuuming point to the inlet of the fan.

3. Total pressure refers to the algebraic sum of static pressure and dynamic pressure at a point, that is, the Py=Pd+PJ unit is also a millimeter water column. Centrifugal fans and boiler flues usually adopt dynamic pressure, pressure, pressure and static pressure. For example, the static pressure measurement point on the boiler flue is derived from the flue wall, so the smoke pressure gauge on the boiler dashboard only shows static pressure.

Example of system pressure

to seeThe type of air conditioner, the type of refrigerant used and the working conditions at the time of work are different, and the high-pressure refrigerant pressure of the system is very different.

/ Condensation / throttle / evaporation are four processes, of which the condensation and evaporation processes will involve heat exchange. In this process, the state of the refrigerant will change, and pressure is one of the indicators for assessing this change. Therefore, there is a difference between condensation pressure and evaporation pressure. Generally, there are these two pressure indications on the cooling and drying machine.

The pipe may be subjected to many kinds of external forces, including its own weight (pipe, valve, pipe junction, insulation layer and the weight of the fluid in the pipe), the thrust of the pressure of the fluid on the pipe end, wind and snow load, soil pressure, thermal stress caused by thermal expansion and cold contraction, vibration load and seismic disasters, etc. .