Determination of the pressure pipeline inside the jacketed tube
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I am now dealing with two double-walled pipes used for transporting resin. The inner pipe is used to carry the resin; the operating pressure is around 12 MPa, and the temperature is approximately 220 degrees Celsius. There are no valves on these pipes, their length is about 5 meters, and the end of each pipe leads directly to the atmosphere. The resin is non-toxic, with a flash point of 335 degrees Celsius. Do such pipes fall under the category of pressure pipes? If so, how should the inner tube be inspected regularly? Can 100% radiography be used as a substitute for pressure testing?
With such high pressure, I’m very skeptical about connecting it directly to the atmosphere at the end – without any pressure reduction? 100RT cannot replace a hydrostatic test
The pipeline has a directional valve and a filter; at the end, it leads to the atmosphere, with the finished product being discharged directly there. Mainly, this substance has an extremely high viscosity; it’s like a concentrated version of honey, and without such high pressure, it simply won’t flow out
If the viscosity is high, will heating it improve its flowability?
Bro, you’re going off-topic. I'm asking whether this pipeline is a pressure pipeline. We won’t consider the process part
How can you make a judgment without knowing the diameter? ? ?
This is a Class C medium and is not considered a pressure pipeline.
Can’t you look up the definition of pressure pipelines by yourself? Pressure pipelines refer to tubular devices that use a certain pressure to transport gases or liquids. They are defined as pipelines with a maximum operating pressure of 0.1 MPa (gauge pressure) or more, carrying gases, liquefied gases, steam, or liquids that are flammable, explosive, toxic, corrosive, and have a maximum operating temperature equal to or higher than their standard boiling point, and with a nominal diameter of 50 mm or more. Except for pipes with a nominal diameter of less than 150 mm and a maximum operating pressure of less than 1.6 MPa (gauge pressure), as well as the pipes that form part of the equipment used for transporting non-toxic, non-flammable, and non-corrosive gases. Among them, the safety supervision and management of oil and gas pipelines shall also be carried out in accordance with laws and regulations such as the Work Safety Law and the Oil and Gas Pipeline Protection Law.
Won’t you look it up by yourself to find the definition of pressure pipelines? Pressure pipelines refer to tubular devices that use a certain pressure to transport gases or liquids. They are defined as pipes with a maximum operating pressure of 0.1 MPa (gauge pressure) or more, where the medium is a gas, liquefied gas, steam, or a liquid that is flammable, explosive, toxic, corrosive, and has a maximum operating temperature equal to or higher than its standard boiling point; such pipes also have a nominal diameter of 50 mm or more. Except for pipes with a nominal diameter of less than 150 mm and a maximum operating pressure of less than 1.6 MPa (gauge pressure), as well as the pipes that form part of the equipment used for transporting non-toxic, non-flammable, and non-corrosive gases. Among them, the safety supervision and management of oil and gas pipelines shall also be carried out in accordance with laws and regulations such as the Work Safety Law and the Oil and Gas Pipeline Protection Law.
It’s precisely this flammability that is difficult to define; the regulatory standards specify categories A and B, but they avoid addressing category C, without clearly stating whether it falls under that category or not.