【20090815 Focus Topic】Pipeline pressure problem?
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This post was last edited by phy3869180 on 2009-8-15 08:08. What is the relationship between the maximum pressure that carbon steel pipes can withstand in use and the design pressure?
1# laj1984 1. The working pressure is the actual operating pressure of the system, and the design pressure is the pressure level that can ensure the normal operation of the system. Generally speaking, the design pressure is 1.5 times the working pressure. 2. The design pressure of the equipment is the pressure that the equipment should not exceed during long-term operation. The design pressure of the system is the working pressure of the system at the lowest point of the system under the design working condition (or the lowest point of the partition system, I have questions). 3. The test pressure is divided into equipment pressure test and system pressure test. The equipment test pressure is 1.5 times the equipment design pressure. The system test pressure varies greatly according to different systems. Air conditioning, steel pipe heating systems, and heating systems with chemical pipes have different test pressures and test standards. For details, please refer to the construction acceptance specifications ("Acceptance Specifications for Ventilation and Air Conditioning" and "Construction Quality Acceptance Specifications for Building Water Supply, Drainage and Heating Engineering (GB50242-2002)")
The design pressure is the pressure calculated by the designer based on the actual operating pressure plus a certain safety factor. The maximum pressure a pipe can withstand can be calculated based on the material used to make the pipe. The design pressure is certain, but the maximum pressure that the pipeline can withstand will decrease with time due to corrosion and thinning of the pipe wall. The maximum pressure that the equipment can withstand is greater than or equal to the design pressure.
Children, don’t teach bad people, read more books, the specific ones are too long, I don’t want to type them. Each project will have specific regulations or use different specifications. Generally, it is 1.1 times the working pressure (<1.7MPA, or plus 0.4MPA, or 1.05 times). The design pressure is not the pressure that the equipment should not exceed during long-term operation, but the maximum pressure that may be encountered. This kind of working condition generally occurs under accident conditions, or under driving conditions, etc., and must be considered comprehensively.
This post was last edited by lg280760665 on 2009-8-14 08:47 Design pressure is the pressure calculated by the designer based on the actual operating pressure plus a certain safety factor. The maximum pressure a pipe can withstand can be calculated based on the material used to make the pipe. The design pressure is certain, but the maximum pressure that the pipeline can withstand will decrease with time due to corrosion and thinning of the pipe wall. The maximum pressure that the equipment can withstand is greater than or equal to the design pressure. The above is a quote, the following is my personal opinion.: First of all, the design pressure is the maximum pressure of the pipeline multiplied by a certain safety factor, not plus! ! The maximum pressure of a pipeline is the maximum force that the pipeline can withstand without causing bending, deformation or other damage to the pipeline. It is impossible for ordinary designers to design the working pressure of the pipeline to the maximum pressure of the pipeline. This will test the safety of the project. There are various specifications in various industries. If you are designing, it is best to check the specifications first! !
Why is my quote different from others? ? Who can teach me? ?
The maximum pressure that carbon steel pipes can withstand in use/design pressure = safety factor. The design pressure is greater than or equal to the highest pressure that may occur in use.
The design pressure is proposed by the process professional. The system pressure of the pipeline is also determined by the nearby system and equipment. The equipment determines the design parameters of the pipeline.； The maximum pressure of a pipeline cannot be viewed in isolation. You need to look at the temperature-pressure grade curve of the pipeline. It must be a high point that can be tolerated at cold temperatures. If it is high temperature, the maximum pressure that the pipeline can withstand will shrink a lot.
The design pressure is calculated by the process based on the working pressure under objective conditions such as the transported medium and temperature. The design pressure is less than or equal to the maximum pressure. The maximum pressure that a pipeline can withstand is the pressure that the metal can withstand when it is damaged and deformed.
The design pressure is to ensure that no safety accidents will occur under this pressure, and the working pressure is the pressure under which the equipment process operates.
The design pressure should be the maximum pressure within the safety range of the system, and the working pressure should be the pressure at which the system works normally.