Gas distribution stations (GDS) are designed to reduce the pressure of natural, associated petroleum gas pre-cleaned from heavy hydrocarbons to the specified pressure and maintain it with a specified accuracy, as well as to measure gas flow. Depending on the main gas parameters at the inlet and outlet, gas distribution stations can be designed as block (one or several blocks) or stationary versions.
Gas distribution points (GDP) are designed to reduce the pressure of natural, associated petroleum gas, previously purified from heavy hydrocarbons, to a given pressure and maintain it with a given accuracy, as well as to measure gas flow. Depending on the main parameters of the gas at the inlet and outlet of GDP, hydraulic fracturing can be performed both in block (one or several blocks) and stationary versions.
The GDPs are designed to be used for outdoor operation under conditions standardized for UHL performance of location category I in accordance with GOST 15150-69.
Main technical parameters of GDP
| Parameters | Value |
| Inlet gas pressure, MPa | 1.2; 0.6 or other according to customer's requirement |
| Outlet gas pressure, MPa | 0.3 to 0.002 ... 0.005 |
|
Throughput, nm3/hour |
up to 130 000 |
| Accuracy of gas pressure maintenance at the hydraulic fracturing outlet, % | +10 |
| Ambient temperature, °С | - 40 ... + 45 (-60 ... +40 special northern version) |
| Power supply, V | ~ 380/220 |
Construction and main components.
The typical design of gas distribution points (GDP) includes a technological compartment and a control compartment. They are equipped with separate entrances from the outside and are protected from access by unauthorized persons. In the technological compartment (compartment category for explosion and fire safety - A) are placed:
- switching node;
- reduction unit (including for own needs);
- gas flow measurement unit;
- gas purification unit.
The control compartment accommodates (compartment category for explosion and fire safety - D):
- heating unit with piping;
- communication node;
- node of control and automatic control of technological processes;
- alarm unit;
- hydraulic fracturing operator workplace.
The compartments are heated by radiators with the coolant supplied from the heating unit located in the control compartment. Ventilation of compartments of the required multiplicity is provided by supply and exhaust grilles made in the outer walls of the unit.
Block modules for gas distribution points (GDPs) are made of sandwich panels, have a single load-bearing metal frame and a reinforced metal frame. The degree of fire resistance is not lower than III a.
The equipment and pipelines in the compartments are fastened to the frame and frame elements. Partitions between compartments, as well as seals of pipe and cable wiring are hermetic.
GRP control and management equipment
Automation equipment is designed to operate under the following conditions:
- power supply from an industrial single-phase network of alternating current 220V and a frequency of 50 Hz;
- ambient air temperature from +5 to +50°С.
The equipment provides:
- gas flow measurement with temperature and pressure correction;
- control of gas pressure at the inlet and outlet of hydraulic fracturing;
- gas pressure control before and after filters;
- control of gas pressure after pressure regulators;
- signalization of coolant temperature drop below 70°С;
- signalization of gas pressure drop to the boiler less than 50 mm. rt. Art.;
- signaling the increase and decrease in gas pressure at the inlet and outlet of the hydraulic fracturing;
- door lock violation alarm;
- compartment gas alarm;
- issuance an emergency sound signal to the control compartment.
For a commercial gas consumption metering unit, a meter with an electronic corrector was used, which provides the calculation of gas consumption reduced to standard conditions with hourly archiving of all measured and calculated parameters for the last 6 months.
Power supply input ~ 380/220V. Electricity is metered in the operator's panel.
The following types of lighting are provided:
- working lighting;
- emergency lighting;
- repair lighting with portable lamps
The ventilation of the compartments of the hydraulic fracturing module is general exchange, supply and exhaust, natural ventilation is carried out by supply, located in the lower part of the doors, and exhaust, located in the upper part of the outer walls, with louvered grilles. The design, quantity and location of the gratings provide three-fold air exchange in the technological compartment and the control compartment. From the heating apparatus, a chimney is made with the removal of combustion products into it.
GAS CONTROL POINTS (cabinet version).
GCP-C is designed to reduce the pressure of natural or associated petroleum gas, previously purified from heavy hydrocarbons, to a predetermined pressure and maintain it with a predetermined accuracy.
GCP-C is designed for outdoor use under conditions specified for UHL version of location category I according to GOST 15150-69, as well as indoors together with gas consumers.
Main technical parameters of GCP-C
| Parameters | Value |
| Inlet gas pressure, MPa | 1.2; 0.6 or other according to customer's requirement |
| Outlet gas pressure, MPa | 0.002 ... 0.005 |
| Throughput, nm3/hour | up to 5 000 |
| Accuracy of gas pressure maintenance at the hydraulic fracturing outlet, % | +10 |
| Ambient temperature, °С | -70...+35 |
| Power supply, V | ~ 380/220 |
Construction and main components.
Typical design of gas control units (GCP-C) – is a monoblock product with the placement of equipment in a single metal cabinet. The wardrobe has double doors with a lock that open outwards.
Inside the cabinet are:
- stop valves;
- pressure regulator;
- filter;
- pipelines;
- safety relief valve;
- control and measurement instruments
Outside the cabinet are:
- purge and reset candles;
- insulating flange connections.
Additionally, it is possible to manufacture a gas metering unit and organize commercial gas metering.
Our production
The production branch of JSC "Novamash" is located in the metallurgical center of the Sverdlovsk region, the city of Nizhny Tagil.
The company's production facilities are equipped with modern equipment of domestic and European manufacturers, which makes it possible to manufacture structures for various purposes according to the highest requirements.
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