High pressure carbon steel for gas conduits

The high pressure carbon steel for gas conduits includes control valves, filters, pressure reducing devices, pressure gauges, flow meters, on-line analyzers, etc., and should be concentrated in the gas inlet chamber. After the gas is pressurized by the blower, compressor, pump and boiler, it flows from the high pressure of the pipeline to the low pressure, and can also be transported by the pressure or gravity of the gas itself. When the flow rate of the gas is known, the size of the pipe diameter depends on the allowable flow rate or the allowable frictional resistance (pressure drop). When the flow rate is large, the pipe diameter is small, but the pressure drop value is increased. However, the operating energy costs of power equipment such as pumps and compressors increase. In addition, if the flow rate is too large, there may be some other unfavorable factors. Therefore, the pipe diameter should be determined based on construction investment, operating costs and other technical factors.

High pressure carbon steel for gas conduits may be subjected to a variety of external forces, including their own weight, thrust acting on the pipe end, wind and snow loads, soil pressure, thermal stress caused by thermal expansion and contraction, vibration loads, and earthquake hazards. In order to ensure the strength and rigidity of the pipeline, various support (hanging) brackets, such as movable brackets, fixed brackets, guide brackets and spring brackets, must be provided. The setting of the bracket is determined by the diameter of the pipe, the material, the wall thickness of the pipe, and the load. The fixed bracket is used to control the thermal elongation of the pipe in stages to make the expansion joint work evenly; the guiding bracket allows the pipe to move only axially. In order to exclude condensate, steam and other water-containing gas pipelines should have a certain slope, generally not less than two thousandths. For underground drainage pipes that use gravity to flow, the slope is not less than five thousandths. Steam or other water-containing gas pipelines are provided with drains or traps at the lowest point. Some high pressure carbon steel for gas conduits are also equipped with gas-water separators to remove water from the water in time to prevent water hammer and obstruct the gas flow. The water supply or other liquid pipeline is provided with a venting device at the highest point to exclude air or other gas accumulated in the pipeline to prevent the gas barrier from causing malfunction. If the pipe cannot be flexibly stretched, it will generate a huge additional stress. Therefore, on pipes with large temperature changes and normal temperature pipes requiring free displacement, expansion joints need to be provided to compensate for the expansion and contraction of the pipes and eliminate the influence of additional stress. For steam pipes, high-temperature pipes, low-temperature pipes, and pipes with anti-scalding and anti-freezing requirements, it is necessary to cover the outside of the pipes with insulation materials to prevent loss or freezing of heat (cold) in the pipes. Commonly used insulation materials are cement perlite, glass wool, rock wool and asbestos diatomaceous earth.

Connection method
The connection method between the inlet and outlet pipes on pipes, pipe couplings, valves and equipment is determined by the nature of the gas, pressure and temperature, as well as the material, size and installation location of the pipe, mainly including threaded joints, flanged joints, and sockets. Four methods of joining and welding.