The diameter of the gas pipeline within the boiler is selected according to the maximum gas flow rate at a speed of 50 - 70 m/s. Only steel fittings for the gas pipeline (valves, gate valves, flaps) are used. Gas pipeline supports are installed, as a rule, on the brackets of columns and boiler racks.
The diameter of the gas pipeline from the branch point in front of the gas tanks to the flare candles is determined based on the fact that the pressure loss in this section, taking into account the losses in the candles themselves, must be at least 1 kPa lower than the pressure in the gas tanks. Since the pressure in the gas tanks depends on the permissible pressure in the suction line of the compressors and is equal to 4 kPa, the resistance of this section should not exceed 3 kPa. Therefore, the torch system should not be particularly far from candles.
The diameter of the gas pipeline for the nearest one according to the table. 3.3 flow rate (103 M3/h) is 122 mm.
The diameters of gas pipelines are determined hydraulic calculation at maximum gas consumption, taking into account the short-term development prospects of the enterprise and acceptable pressure losses. All underground steel gas pipelines protected against corrosion caused by soil and stray electric currents. Passive and active protection of gas pipelines against corrosion is used.
The diameters of gas pipelines are determined using hydraulic calculations.
The diameters of gas pipelines for individual flare systems, as well as for a hydrogen sulfide flare system, are determined by calculation in each individual case, based on the specific discharge conditions. The equipment of a separate flare system (one or more) should be geographically combined with the installation for collecting flare discharges from the general flare system of the enterprise, whenever possible.
The diameters of gas pipelines (network sections) for given flow rates and pressure drop are usually determined from tables.
The diameter of the gas pipeline is assumed to be constant over the entire height. We take the initial section to be the same length as the remaining sections. We consider the selections for all floors to be the same.
The diameter of gas pipelines is also determined by setting the speed of gas movement, which depends on the temperature and the degree of gas purification from dust and is taken for clean gas u0 8 - - - t - 10 m/sec and for unpurified gas u0 1 - - 3 m/sec.
The diameter of the gas pipeline is determined by the volume and permissible gas velocity. When calculating its diameter, the gas speed in gas pipelines is taken to be 12 - 16 m/sec. The diameter of gas pipelines is calculated based on the volume of gas under operating conditions, and since these conditions (temperature and pressure) change along the entire length of the gas pipeline, the diameter of the gas pipeline is different. The largest diameter of the gas pipeline is in the area between the gas collector and gas refrigerators, the smallest is behind the scrubbers of the benzene department.
The diameter of the gas pipeline, according to the design specifications, was taken to be 820 mm.
The diameter of the gas pipeline is determined by the volume and permissible gas velocity; usually it is 12 - 14 m [sec. The speed is calculated based on the volume of gas under operating conditions, and since these conditions change, the diameter of the gas pipeline in different sections is not the same. The largest diameter is in the area between the gas collector and gas refrigerators.
The diameter of the gas pipeline at single-line transitions remains equal to the diameter of the main pipeline. At double-strand transitions, the pipe diameters are selected so that the total cross-sectional area of the pipes is approximately equal to the cross-section of the main gas pipeline pipe. So, for example, for a gas pipeline Dy 700 mm, the diameter of each siphon thread should be 500 mm, for a gas pipeline Dy 1000 mm - 700 - 800 mm.
The diameter of the gas pipeline is assumed to be constant over the entire height. All sections of the gas pipeline between gas extraction points are equal to each other. We take the initial section to be the same length as the remaining sections. We consider the selections for all floors to be the same.
Before you begin laying gas communications, you need to collect signatures from neighbors who are in close proximity to your site. Then you need to contact the city gas service to obtain permission to connect to the existing central gas pipeline.
The house gasification project must be drawn up taking into account individual characteristics land plot where it will take place gas pipe. To draw up an optimal scheme for constructing a gas pipeline, they find out where the nearest pipeline is located and take into account the gas pressure in it. This is important because gas pipeline categories are divided by gas pressure. It is necessary to know the categories of the gas pipeline laid through your site in order to indicate in the project what the cost will be secured territory mains so that the pipes are not inadvertently damaged during further construction work or landscaping of the site.
Classification of gas pipelines by pressure
Low pressure gas pipelines are quite suitable for private households.
Low-pressure pipelines are used to deliver gas to residential buildings, public buildings, boiler houses and other facilities. Private consumers can be connected to such communications. The security zone for a low-pressure gas pipeline is 2 m on both sides of the pipe. Gas communications of medium and high pressure are needed to power urban distribution networks and supply industrial enterprises where the technological process requires high gas pressure over 0.6 MPa. The security zone of a high-pressure gas pipeline is ten meters on both sides of the pipe if it is category I, and 7 meters if it is category II. As you can see, with increasing pressure, the security zone increases, since the risks of accidental damage to the pipe increase significantly. 
Gas pipeline laying standards
According to approved standards, the laying of ground gas communications is located 320 mm from the ground surface and no less; pipes must be located in places where there are no pedestrian paths or parking lots. The laying of street mains begins after determining the closest point to a group of residential gasified buildings. At this point a branch is made, which is then connected to the central gas pipeline.
When constructing an underground highway, the closest horizontal point from the building to the site of the planned installation of the highway is also determined. It is allowed to lay two pipes in one trench, but with the condition that they will be located at different heights. Moreover, if the pipe diameter is no more than 300 mm, then the distance between them must be maintained at 0.4 m. Shut-off valves at underground installation located at a distance of 2 meters from the building. Professionals can advise you on more detailed aspects of the process. 
The diameter of the gas pipeline within the boiler is selected according to the maximum gas flow rate at a speed of 50 - 70 m/s. Only steel fittings for the gas pipeline (valves, gate valves, flaps) are used. Gas pipeline supports are installed, as a rule, on the brackets of columns and boiler racks.
The diameter of the gas pipeline from the branch point in front of the gas tanks to the flare candles is determined based on the fact that the pressure loss in this section, taking into account the losses in the candles themselves, must be at least 1 kPa lower than the pressure in the gas tanks. Since the pressure in the gas tanks depends on the permissible pressure in the suction line of the compressors and is equal to 4 kPa, the resistance of this section should not exceed 3 kPa. Therefore, the torch system should not be particularly far from candles.
The diameter of the gas pipeline for the nearest one according to the table. 3.3 flow rate (103 M3/h) is 122 mm.
The diameters of gas pipelines are determined by hydraulic calculations at maximum gas flow, taking into account the immediate development prospects of the enterprise and permissible pressure losses. All underground steel gas pipelines are protected from corrosion caused by soil and stray electrical currents. Passive and active protection of gas pipelines against corrosion is used.
The diameters of gas pipelines are determined using hydraulic calculations.
The diameters of gas pipelines for individual flare systems, as well as for a hydrogen sulfide flare system, are determined by calculation in each individual case, based on the specific discharge conditions. The equipment of a separate flare system (one or more) should be geographically combined with the installation for collecting flare discharges from the general flare system of the enterprise, whenever possible.
The diameters of gas pipelines (network sections) for given flow rates and pressure drop are usually determined from tables.
The diameter of the gas pipeline is assumed to be constant over the entire height. We take the initial section to be the same length as the remaining sections. We consider the selections for all floors to be the same.
The diameter of gas pipelines is also determined by setting the speed of gas movement, which depends on the temperature and the degree of gas purification from dust and is taken for clean gas u0 8 - - - t - 10 m/sec and for unpurified gas u0 1 - - 3 m/sec.
The diameter of the gas pipeline is determined by the volume and permissible gas velocity. When calculating its diameter, the gas speed in gas pipelines is taken to be 12 - 16 m/sec. The diameter of gas pipelines is calculated based on the volume of gas under operating conditions, and since these conditions (temperature and pressure) change along the entire length of the gas pipeline, the diameter of the gas pipeline is different. The largest diameter of the gas pipeline is in the area between the gas collector and gas refrigerators, the smallest is behind the scrubbers of the benzene department.
The diameter of the gas pipeline, according to the design specifications, was taken to be 820 mm.
The diameter of the gas pipeline is determined by the volume and permissible gas velocity; usually it is 12 - 14 m [sec. The speed is calculated based on the volume of gas under operating conditions, and since these conditions change, the diameter of the gas pipeline in different sections is not the same. The largest diameter is in the area between the gas collector and gas refrigerators.
The diameter of the gas pipeline at single-line transitions remains equal to the diameter of the main pipeline. At double-strand transitions, the pipe diameters are selected so that the total cross-sectional area of the pipes is approximately equal to the cross-section of the main gas pipeline pipe. So, for example, for a gas pipeline Dy 700 mm, the diameter of each siphon thread should be 500 mm, for a gas pipeline Dy 1000 mm - 700 - 800 mm.
The diameter of the gas pipeline is assumed to be constant over the entire height. All sections of the gas pipeline between gas extraction points are equal to each other. We take the initial section to be the same length as the remaining sections. We consider the selections for all floors to be the same.
The diameter of gas pipelines is accepted to be at least 50 mm.
The diameters of gas pipelines are accepted to be at least 50 mm.
The diameter of the gas pipeline is gradually reduced to 500 mm.
The diameters of cold gas pipelines and the diameters of throttle valves are determined based on the amount of gas Q2 and QJ and the pressure drop across the valve and gas pipeline. Typically, the diameter of gas pipelines and dampers does not exceed 400 - 500 mm.
The diameters of cold gas pipelines and the diameters of throttle valves are determined based on the amount of gas Q2 and Q and the pressure drop across the valve and gas pipeline. Typically, the diameter of gas pipelines and dampers does not exceed 400 - 500 mm.
The diameters of the gas pipelines of the common flare system must be taken taking into account this condition.
The diameters of gas pipelines for heating boilers, municipal and industrial enterprises are calculated based on the maximum gas flow rate in the area and permissible pressure drops.
The diameters of gas pipelines for heating boilers, municipal and industrial enterprises are calculated based on the maximum gas flow rate in the area and permissible pressure drops. When calculating gas pipelines, it is assumed that friction losses should not exceed 25% of the nominal pressure of the burners. In this case, losses due to local resistance are added to linear losses.
Determine the diameter of the gas pipeline if the pressures at the beginning and end of the gas pipeline and the flow rate are known.
We select the diameters of gas pipelines for individual sections of the pipeline depending on the flow rate and specific pressure loss.
Determining the diameter of a gas pipeline using formula (3 - 1), given by the gas velocity, is possible only with rough approximate (estimated) calculations.
When the diameter of the gas pipeline was changed to 1020x11 2 (12 5) mm and the REP site was moved from Kartopya to Komsomolsky, the construction organization project was not changed. Therefore, the design volumes of work in general and for individual complexes of structures cannot correspond to those finally approved. Nevertheless, on a number of provisions and constructive solutions proposed in the POR, it is advisable to stop, since they are common to the area of the route, regardless of the diameter of the pipeline being laid.
Determine the diameter of a gas pipeline transporting 600,000 m3 of gas per day from the well to the reservoir, if the length of the gas pipeline is 800 m, the pressure at the well head is 68 at, the pressure in the reservoir is 30 at, the relative density of gas is 0 64, the gas compressibility coefficient is 0 9; gas temperature 22 C.
The diameters of gas pipelines are selected according to standards and the actual pressure drop in the pipeline is checked based on the accepted diameters.
Determine the diameter of the gas pipeline from the well to the gas collection manifold.
If the diameter of the gas pipeline is not specified, then it can be considered equal to the internal diameter of the separator inlet pipe.
Schemes of general boiler gas pipelines. Therefore, the diameters of the gas pipelines of the boiler room must be selected so that with the maximum possible change in the thermal power of parts of the burners or units, the gas flow through those remaining in operation gas-burners changed slightly.
Diagram of a gas flaring unit. The diameter of the gas pipeline from a separate facility to the flare header is calculated based on the maximum emergency discharge of this facility. The maximum emergency discharge is determined by summing the one-time maximum discharge from safety valves one apparatus and technological blow-offs. If, due to the operating conditions of the installation, simultaneous operation of valves on a group of devices is possible, then the maximum discharge from this group is added to the process blow-offs.
The determination of gas pipeline diameters for individual flare systems, as well as for a hydrogen sulfide flare system, is justified by calculation in each individual case based on the specific discharge conditions.
Reducing the diameters of gas pipelines leads to a significant reduction in capital and metal investments during construction. For our example, the cost of construction is reduced by 2 times, as can be seen from table. 73, which is compiled according to data from the Mosyudzmproekt Institute and reflects the actual costs of constructing 1 km of underground gas pipelines in Moscow without taking into account overhead costs and a reduction factor due to improved organization of work. Metal investments are reduced by more than 2 times.
Capacity of gas pipelines. Determining the diameters of gas pipelines and pressure losses when calculating dead-end networks is not difficult, whereas when calculating ring networks this is associated with finding the correct distribution of gas flows throughout the network, usually called network linking.
Capacity of gas pipelines. Determining the diameters of gas pipelines and pressure losses when calculating dead-end networks is not difficult, whereas when calculating ring networks this is associated with finding the correct distribution of gas flows throughout the network, usually called network linking.
Comparative capacity of gas pipelines. Determining the diameters of gas pipelines and pressure losses when calculating dead-end networks is not difficult, whereas when calculating ring networks this is associated with finding the correct distribution of gas flows throughout the network, called network cohesion.
The change in the diameter of gas pipelines along the radius of action of the hydraulic fracturing is telescopic in nature. Therefore, the dependence lt - lt (t) is not linear.
If the diameter of the gas pipeline supplying gas to the burner is less than Dy 40 mm, the control device can not be installed and the circuit is simplified. Increased safety is achieved by inserting a purge gas pipeline into the manifold up to the PKN (PKV) and connecting the last section of the manifold to the safety gas pipeline.
When the diameter of the gas pipelines to be welded is more than 600 mm, it is allowed to weld control plates.
When the diameter of the gas pipelines being welded is less than 50 mm and the pipe wall thickness is less than 4 mm, for every 50 production joints the welder must weld two control joints.
Transitions change the diameter of gas pipelines. In practice, they are often made from pipes by cutting wedges and welding the remaining parts. The most common transitions are made of sheet steel, with one or two longitudinal seams.
Calculated (/ and experimental (2) dependence of the critical crack length on the stress level for pipes 1220x12 mm from Tyaln 08G2SF. The larger the diameter of the gas pipeline, the steel of the pipes must provide (withstand) a larger crack length without growing to the critical size. In Fig. 29 , and the dependence of the critical length of a crack, which must be ensured by the metal of pipes of various diameters, is shown. The dimensions of the critical length of a crack, for example, for gas pipelines with a diameter of 1020 - 1220 (Fig. 29, a) are 180 - 230 mm, which corresponds well to the data of actually observed gas pipeline ruptures Fractures most often occurred in pipes whose steel had a critical crack length of less than 200 mm. All this indicates a satisfactory agreement between calculated and experimental studies and the data of actual damage observed on gas pipelines.
Thus, the diameter of gas pipelines of 1420 mm i strictly corresponded to the increase in production and transport gas from one region (Western by 30 - 40 billion m or more, a sharp slowdown in the pace of development of the gas industry in the future and the achievement of more modest annual increases in the achieved concentration levels unit capacities may in some cases even be excessive.
D - gas pipeline diameter, mm; T - test duration, hour. In all cases, the start of the test is set to be no less than 12 hours later.
Transitions change the diameter of gas pipelines. In practice, they are often made from pipes by cutting wedges and welding the remaining parts. Transitions made of sheet steel with one or two longitudinal seams have become widespread.
The average diameter of gas pipelines in low-pressure networks is 1-75 - 2-15 times smaller than in medium-pressure networks.
