Gas control points are established near residential and industrial areas. In this article, we consider the purpose, structure and classification of EMG. Also we will present the main principles of the setting items and the requirements for their operation.
Gas control point (HF) is a complex of technological equipment and mechanisms for the adjustment of the gas pressure. The main purpose of the position: decrease inlet pressure of natural substances and maintain a given level of output, regardless of the expenditures.
Types of hydraulic fracturing as to the place of installation are:
Hydraulic fracturing can be classified according to several parameters. For example, the possible decrease of gas pressure. Transcript of hydraulic fracturing are discussed below.
According to the output gas pressure is provided by hydraulic fracturing (explanation: gas control points), there are units that provide the same or different pressure.
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Also, the fracture can be single or dual outputs. The performance of the device is a left or a right, depending on locations of receipt of gas.
The Input and output of volatile substances can be performed from opposite sides of hydraulic fracturing, on the one hand, to be vertical and horizontal.
The pressure of the gas at the exit point can vary, thus fracturing klassifiziert:
Transcript of hydraulic fracturing have already given. Items can be dead-end or looped. This scheme applies for the security of gas supply. It consists in combining multiple fracturing. It is believed that the more units looped, the higher the reliability of the system. A dead end is considered a scheme when it is impractical to use more than one hydraulic fracturing for gas supply to the consumer.
According to technological schemes of hydraulic fracturing are distinguished:
Regulators in multiple units can be connected in parallel or series.
Hydraulic fracturing is completed in such equipment:
On the standby line is fitted with two shutoff devices, between which is mounted a pressure gauge.
Gas regulation points (GRP) with one line of the reducing gas shall consist of: technological equipment and the frame on which it is placed.
The Principle of operation of these devices:
If the passage of the regulator pressure is not reduced to normative parameters, provided a safety-bleed-valve or water seal.
If the gas discharge has not occurred, that triggers the safety shut-off valve and the termination of gas supply in PH-frac (explanation: the pressure parameter at the beginning of opening PZK) is not more than +0.02 MPa-normative set value of the valve (GOST R 53402-2009 p. 188.8.131.52).
Gas control systems can be applied to the regulators of both direct and indirect action.
When choosing a GRP with one line reduction is usually based on the operating parameters of the controller: bandwidthability, the pressure on the inlet and outlet.
Deciphering abbreviations GRP - gas control points, this has already been said, there are single-line reduction, with two or more.
Controls on the discharge line of the pressure gas can be installed both in parallel and sequentially.
The Principle of operation of multi-line systems:
Multi-line systems more reliable, because in case of failure of one line of the reduction of its functions can be performed with others. Similar actions are performed and if necessary technical replacement of the regulator, clean the filter.
Schemas are used mostly at points of high pressure, for example, to supply consumers in the industrial field. Multiple systems are more expensive compared with single counterparts, they have large dimensions.
The Above, stands for hydraulic fracturing and what happens. This paragraph will present the latest version of the gas control unit – with the bypass.
A Bypass called bypass, another name - the backup line is reduction of natural gas. It is used at the time of primary repair.
Multiline or single-line diagram is endowed with a bypass line. It is equipped with the same equipment that working, but will not participate in the process gas supply if the main line is working.
For backup safety shut-off valve configured to close when a high pressure regulator to lower. Thus, when exceeding the output pressure due to a malfunction of the main regulator shut-off valve stops supplying gas to the consumer. For the consumption of the output pressure falls and reaches the working norms of the bypass regulator. Typically, the pressure is set 10% lower than on the main line. The regulator maintains this level of reduction.
“the Technical regulation on safety of gas distribution networks and gas consumption” from 29.10.2010 item No. 44 prohibits the design of a single Cabinet and blocky fracturing with bypass line reduction. The only permitted replacement of equipment that is already in use.
Gas control point can be equipped with a node to account for the spending of gas. Counters are selected depending on the input and output pressure, capacity and number of users.
In Order to choose the right device that records use requirements that apply to the measuring instruments. Counters can be either direct or indirect measurements.
Hydraulic fracturing, equipped with metering of gas, consists of:
This GRP is equipped with a natural ventilation, which performs the triple blowing of air per hour. If necessary, can be installed the automatic system.
Gas control point must be equipped in accordance with the requirements.
In addition to the EMG sets out the requirement: the equipment of the building telemetry. It helps to ensure the control of pressure, temperature, power supply and opening the doors.
In the operation of this paragraph requires the documentation:
When designing the control point of gas it is important to choose the right pressure regulator.
It is selected based on:
An Important criterion in the choice of the regulator is to ensure the sustainability of its operations at different pressures. For example, for deadlockline aggregate is applied, the regulator of direct action. Expenditure of gas in large volumes – indirect action.
Looped and branched lines are often equipped with astatic controllers of indirect action.
Output pressure may vary depending on several factors. For example, the lack of mode settings operation of the device or flaws of the individual parts of the controller.
In the article, you learned how to decipher fracture, values, abbreviations, types of items and requirements for their operation.
Paragraphs provide additional purification of natural gas after the station distribution and maintain the required outlet pressure. This allows consumers to receive uninterrupted substance and use it.
When designing devices gas control unit it is important to make calculations and take into account the required parameters. What type of fracture will be installed depends on the needs of the territory. Especially attention is paid to the basic parameters of the gas pressure regulator.
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