Gas control unit (GCU)

A gas control unit is a set of technical equipment and devices designed to reduce the pressure of incoming gas to a certain level while maintaining a constant outlet pressure. 

Illustration

Gas control unit (GCU)

A gas control unit is a set of technical equipment and devices designed to reduce the pressure of incoming gas to a certain level while maintaining a constant outlet pressure. 

Features of installation and placement of a gas regulating unit (GRU)

Any autonomous gas supply system must inevitably include a gas pressure regulator (reducer, stabilizer). This device guarantees safe operation of the system and at the same time ensures uninterrupted and stable operation of gasification equipment. Therefore, in order to create the necessary conditions for autonomous gas supply, it is necessary to purchase and install special equipment, including a gas regulating unit.
There are certain standards that establish the correct location and use of gas distribution units:
● It is allowed to install gas regulating units indoors and in a metal cabinet, but the cabinet door must be replaced with a mesh to provide full access to all components of the GCU (pressure regulators, shut-off valves, gas filters, drain and shut-off valves, control and measuring devices, etc.)
● GDUs should be located in rooms open to all personnel, free from unauthorized persons, with natural and artificial lighting. A minimum of one meter must separate the main passage to the gas regulating unit from the fence and any protruding elements of the building.
● If the gas regulating unit is installed at a height of more than 1.5 meters, it must be accessed from both sides by separate stairs with rungs at least 1.2 meters high.
● The gas control unit equipment must be protected from the risk of mechanical damage.
In addition to the characteristics of the gas control unit, an important factor is the distance to the equipment that uses gas. Gas control units (GCUs) of boiler houses, industrial and municipal enterprises are often located in the same room as the equipment that uses gas. It is important that the gas regulating unit of the GDU is as close as possible to the point of entry of the gas pipeline into the room, if possible. When working with higher pressures, the GCU should be placed in separate buildings or sheds, with a blank fireproof wall separating it from the boiler rooms.

Liquefied gas pressure regulator as the main element of a gas regulating unit 

Uninterrupted gas supply to consumers (autonomous gas supply) and the operation of gas-consuming equipment (burners, boilers, furnaces, etc.) for both commercial and residential facilities is often a prerequisite for reliable operation of pressure regulators. This is because an autonomous gas supply eliminates the need for third-party intervention. Liquefied gas is also an acceptable operating medium for regulators.

Gas pressure regulators work according to the concept of creating hydraulic resistance to the flow of incoming gas by changing the degree of opening and closing of the working element of the regulator. This allows the regulator to control the required pressure level.
The required pressure at the inlet and outlet of the equipment varies depending on the specifics of the device's use.

Illustration

Accordingly, the components of the gas regulating unit of the GDU - pressure regulators - can be classified according to the principle of operation:
● Direct-acting LPG pressure regulators have a basic design, since the sensing element in them is directly connected to the working body, and their movement does not require an external power source.
Indirect-acting LPG pressure regulators use an external energy source to drive the actuator.

Another way to categorize these elements of a gas control station is by the control point, with upstream and downstream pressure regulators falling into two categories, respectively.
Gas pressure regulators perform two main functions: the first is to reduce the gas pressure to the working pressure, and the second is to automatically maintain the pressure at the required level.

There are several versions of gas pressure regulators, each of which operates according to a unique set of principles, but all of them consist of basic components:

    The properties of the current pressure are evaluated by the sensor, which then provides this information to the controller.

    The setpoint device (spring or pneumatic, hydraulic or electric pilot) determines the value to be delivered and sends the corresponding signal to the controller.

    The control device compares the signals received from the sensor and the setpoint, calculates what action is required to convert the current value to the desired value, and transmits a command signal.

    The executive mechanism receives a command and converts it into a regulatory action;

    The regulatory body is moved to the position specified by the team.

Boviargas can supply single-stage and two-stage LPG (vapor phase) pressure regulators:

● The pressure drop from high to low is realized in one step with single-stage pressure regulators.

The two regulators that make up the first and second stages of a two-stage pressure regulator are connected to each other. Since these regulators reduce the pressure in two stages, they are the most accurate and reliable. The first stage reduces pressure from high to medium, and the second stage reduces pressure from medium to low. The two stages of a two-stage gas pressure regulator are fully matched in performance, so no further adjustment is required for either stage. In addition, these regulators are very compact and affordable. When liquid propane-butane tanks and consumers are located in close proximity to each other, they are used in the process of autonomous gas supply.

Many LPG pressure regulators can be equipped with safety mechanisms, such as a safety shut-off valve, which are triggered in response to uncontrolled pressure fluctuations and prevent the regulator from being destroyed along with the rest of the equipment.
BoviarGas selects and supplies a wide range of pressure regulators that differ in shape, size, operating principle and throughput. We offer a range of gas supply and gasification services for businesses of all types and sizes, residential buildings, and summer cottages. We develop a plan for an autonomous gasification system, supply equipment, install and commission it.

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