Selection of materials for pressure pipeline design and examples of pipeline design
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(1) Selection of codes related to pressure pipeline design； Similarities and differences between China’s standards for pressure pipelines (GB/T 20801) and the ISO 15649, ASME B31.1, B31.3 specifications (II): Selection of pipeline materials and case studies 1. Areas of controversy regarding material selection in pipeline standards 2. Pressure pipeline grades and their engineering applications 3. Material grades and allowable stresses 4. Limitations on the use of pipeline materials at high temperatures 5. Limitations on the use of pipeline materials at low temperatures 6. Design and selection of pipeline accessories such as flanges, bolts, nuts, gaskets, and valves 7. Material selection calculations for special pipelines 8. Material design and selection based on risk assessment (III) Examples of pressure pipeline design and calculation 1. Design conditions and design criteria 2. Pressure design of pipeline components 3. Pipeline stress analysis and pipe supports 4. Flexibility coefficients and stress amplification factors 5. Calculation of wind loads and seismic loads 6. Dynamic load analysis when valves are opened and closed in pipeline systems (IV) Pipeline safety protection 1. Selection and calculation of safety relief devices 2. Determination of safety relief volume and minimum relief area ； 3. Design of inlet and outlet valves and pipelines for safety relief devices 4. Selection of safety relief devices 5. Application and installation of flame arrestors 6. Safety measures in plant layout 7. MESG and explosion ratings for flammable gases and vapors. Those interested can ask for more details or leave your contact information so that the relevant information can be shared with you
I. Selection and differences of codes related to pressure pipeline design: – In China, the design of pressure pipelines is primarily based on the GB/T 20801 standard. - ISO 15649 is an international standard applicable to pressure pipelines in the oil and gas industry. - ASME B31.1 is primarily applicable to pipeline systems in power plants, while B31.3 is mainly used in the petrochemical industry. - Main similarities and differences: The scope of application of the standards varies; GB/T 20801 places more emphasis on adapting to China’s national conditions, while ASME and ISO are more commonly used in international projects. Design parameters, safety factors, etc., may vary. II. Selection of pipeline material design and case analysis: 1. When selecting materials, factors such as the properties of the medium, operating pressure, and temperature must be taken into account. The controversy arises mainly from the different ranges of operating conditions for which various materials are suitable. 2. The classification of pressure pipelines is based on operating pressure and the hazard level of the medium, which determines the materials and inspection requirements, etc. 3. The material grade must meet the allowable stress under the design pressure and temperature conditions; common materials include carbon steel and stainless steel. 4. At high temperatures, heat-resistant materials such as alloy steel should be chosen to prevent a decrease in strength. 5. Under low-temperature conditions, low-temperature steel or other special alloys should be used to prevent brittle fracture. 6. The selection of accessories such as flanges and bolts must take into account factors like the working medium, temperature, and pressure, and should be compatible with the pipeline material. 7. For special pipes such as those resistant to corrosion and high temperatures, appropriate materials must be selected based on the specific application. 8. Risk-based design takes into account the impact of potential failures by selecting materials with a higher safety level. III. Examples of pressure pipeline design and calculation: 1. Determine the design conditions such as operating temperature, pressure, medium, etc. 2. Calculate the design pressure of piping components such as elbows and flanges. 3. Stress analysis includes static and dynamic stresses, and the support design ensures pipeline stability. 4. The flexibility coefficient and stress increase coefficient affect pipeline layout. 5. Calculation of wind loads and seismic loads to ensure the safety of pipelines under the action of natural forces. 6. Dynamic load analysis, taking into account pressure fluctuations caused by valve operation. IV. Pipeline safety protection: 1. Safety relief devices are selected based on design pressure and flow rate. 2. Determine the discharge volume and minimum discharge area, and design a safe discharge path. 3. Select appropriate safety relief devices, such as safety valves and rupture discs. 4. Flame arrestors prevent the spread of flames, protecting equipment and personnel safety. 5. The layout of the factory must take into account safety distances and protective measures. 6. For flammable gases and vapors, it is necessary to understand the MESG (Maximum Safe Gap) and explosion classification in order to implement appropriate protective measures. .