Design Points of Cryogenic Pipelines
Design Points of Cryogenic Pipelines Abstract: In petrochemical enterprises, cryogenic pipelines are frequently used. Generally speaking, pipelines conveying materials below +5°C are referred to as cryogenic pipelines. However, in practice, low-carbon steel can be normally used within the range of +5°C to -20°C, as the steel is mainly in a ductile state under these conditions. When the temperature drops below [...]
Low Temperature Pressure Vessels
Low Temperature Pressure Vessels Currently, there are no specific standards for low temperature pressure vessels in our country. JB4732 does not differentiate between low temperature and normal temperature boundaries. ★ For low temperature shell-and-tube heat exchangers, see Appendix A of GB151-1999. ★ For low temperature pressure vessels, see Appendix E of GB150.3-2011 (in the old version GB150 it was Appendix [...]
Tubing Definition and Knowledge
Tubing Definition and Knowledge Tubing is a hollow section with no welds from end to end. Steel pipes, which have hollow sections, are extensively used for conveying fluids such as oil, natural gas, gas, water, and certain solid materials. Compared to solid steel bars like round steel, steel pipes with the same bending and torsional strength are lighter in weight, [...]
Discussion on the Heat Treatment Process of 12Cr1MoV Steel for High-Pressure Steam Pipes
Discussion on the Heat Treatment Process of 12Cr1MoV Steel for High-Pressure Steam Pipes Abstract: The high-pressure steam pipes of steam turbines are an essential component of the entire unit, and the selection of tubing material and heat treatment processes directly impact the service life of the entire unit. Our factory uses 12Cr1MoV material for high-pressure steam pipes based on [...]
Welding of high-pressure boiler heated tubes in power plants— Butt welding of tubes
Welding of high-pressure boiler heated tubes in power plants— Butt welding of tubes I. Technical status of base metal 15CrMo steel is a low-alloy heat-resistant steel with a pearlitic structure. It has high thermal strength (σb ≥ 420 MPa) and oxidation resistance at high temperatures, along with some resistance to hydrogen corrosion. Its delivery condition is normalized + tempered. Due [...]
Selection of Wall Thickness and Pressure Resistance Calculation for Seamless Steel Pipes
Selection of Wall Thickness and Pressure Resistance Calculation for Seamless Steel Pipes For seamless steel pipes, given the outer diameter and wall thickness, we can calculate the maximum pressure the pipe can withstand. Alternatively, if the outer diameter and pressure are known, we can determine the most economical and suitable wall thickness. These two scenarios are commonly encountered by our [...]