The composition and process flow of the gas pressure regulating station

It should be a gas pressure regulating station, which is a facility that automatically adjusts and stabilizes the pressure in the pipeline network in the city gas transmission and distribution system. The main valves of the incoming and outgoing gas pipelines are located at a certain distance outside the station.

Gas pressure regulating stations can be divided into high and medium pressure regulating stations, high and low pressure regulating stations, medium and low pressure regulating stations according to the pressure of inlet and outlet pipelines. Gas pressure regulating stations can be installed in the open air, on a separate structure above ground, in an underground room, in a room or in the basement of a building, or on a roof platform, for which different regulations differ.

That is, the pressure of natural gas transported by the external trunk pipeline is very high, about dozens of kilograms, and the natural gas pressure used at home needs to be relatively low, about 3kpa, so an intermediate device is needed to adjust the natural gas pressure of the pipeline for civil use. These devices are placed in the house and are called pressure regulating stations.

Answers]: a, d, e

According to the nature, the gas pressure regulating station is divided into regional pressure regulating Huifu station, user pressure regulating station and special stuffy leakage pressure regulating station. According to the range of regulating pressure, it is divided into high and medium pressure regulating stations, high and low pressure regulating stations and medium and low pressure regulating stations. According to the architectural form, it is divided into above-ground pressure regulating station, underground pressure regulating station and box-type pressure regulating station.

Questions that may interest you.

A gas pressure regulating station is a facility used to depressurize natural gas or liquefied gas in a high-pressure gas pipeline to a suitable low-pressure state and then transport it to the user's terminal. In general, the occasions that need to set up a gas pressure regulating station include: 1

Cities or regions with large gas consumption and wide distribution of acres need to build a gas pipeline network to transport gas to user terminals. 2.The gas pressure in the gas pipeline is high, and it needs to be lowered to a suitable low pressure state to ensure the safety of users.

3.The gas pressure regulating station can monitor, control and regulate the gas to ensure the stability and reliability of gas transmission. 4.

The gas pressure regulating station can filter and dehumidify the gas to ensure the quality of the gas delivered. In short, the gas pressure regulating station is a vital part of the gas transmission system, which can ensure the safety, stability and reliability of gas transmission and ensure the use needs of users.

The main functions of the gas pressure regulating station are pressurization, pressure reduction, and pressure regulation.

The pressure regulating station has the function of raising and lowering the gas pressure of the pipeline to facilitate the transportation of gas. The main function of the gas pressure regulating station is to regulate and stabilize the system pressure, and to control the gas flow of the gas transmission system, and to protect the system from excessive or low outlet pressure.

The main functions of the gas pressure regulating station are: pressurization, pressure regulation and pressure reduction.

The main function of the pressure regulating station in the gas transmission and distribution system is to regulate and stabilize the system pressure, and control the gas flow, prevent the equipment from being worn and blocked after the pressure regulator, and protect the system from the outlet pressure is too low or overpressurized.

The pressure regulating station is composed of a pressure regulator, a valve, a filter, a safety device, a bypass pipe and a measuring instrument. Some pressure regulating stations are equipped with metering equipment, which play a measuring role in addition to voltage regulation, so they are called pressure regulating metering stations.

a) Valves. In order to access the regulator and filter, and to cut off the air supply when the regulator is deactivated, valves must be installed at the inlet and outlet of the pressure regulating station. In addition, valves should also be installed on the main inlet and outlet pipelines at a distance of 10 m from the pressure regulating station.

During normal operation, this valve is in a normally open state. When an accident occurs at the regulator station, you don't have to approach the regulator station to close the valve to cut off the gas source to prevent the accident from spreading. During the overhaul of the pressure regulating station, this valve should also be closed and the air supply should be cut off.

b) Filters.

Various impurities contained in the gas are accumulated in the regulator and safety valve, which will hinder the coordination of the valve core and valve seat, and affect the normal operation of the regulator and safety valve, so the filter must be installed at the inlet of the regulator. Regulator stations often use bristles or glass filaments as filler filters. The solid particles that the gas brings into the filter hit the baffle plate, and accumulate in the lower part of the filter, and are discharged by the cleaning hole 5 periodically, and the small particle solids and dust residues remaining in the gas are retained on the filter element.

The filter material is installed between the two metal grids, and the upper cover should be removed first when cleaning, and the filter element should be taken out. A differential pressure gauge should be installed before and after the filter boundary, and the blockage of the filter can be judged according to the measured pressure drop. Under normal working conditions, the pressure loss of gas through the filter shall not exceed 10kpa, and it should be removed and cleaned when the pressure loss is too large.

c) Safety valves.

Because when the regulator film is broken, closed loosely or the adjustment fails, the regulator will lose its automatic regulation and pressure reduction effect, causing the outlet pressure to rise suddenly, resulting in system overpressure and endangering safety, therefore, the pressure regulating station must be set up.

Set the safety valve. The outlet pressure of the regulator chamber is controlled by a safety shut-off valve and a safety release valve. The safety shut-off valve controls the upper and lower limits of the pressure, and the safety release valve only controls the upper limit of the pressure.

The release pressure of the release valve should be lower than the closing pressure of the shut-off valve. When the pressure regulator is working normally, the gas is released into the atmosphere only if it is not closed tightly when it should be shut off (due to the accumulation of impurities, wear and tear on the valve, etc.). In this case, the amount of gas flowing through the poorly closed valve is greater than the amount of gas used, and the outlet pressure increases.

In order to avoid excessive outlet pressure, excess gas must be discharged into the atmosphere.