Generally speaking, do the asphalt pipelines in asphalt storage projects qualify as pressure pipelines?
Thread Content
According to the definition of pressure pipelines, the asphalt in ordinary asphalt pipes is a flammable liquid; such pipes are under pressure, their diameter is generally greater than 50, and therefore they should be classified as pressure pipelines. Is there any mistake in my judgment? Because in several projects they worked on, the asphalt pipes were excluded from being classified as pressure pipes. I don’t know what’s going on.
According to the definition, it is indeed a pressure pipeline; however, asphalt has a low level of flammability and is difficult to ignite. To save money, owners certainly won’t want it to be treated as a pressure pipeline. If you don’t do it, the authorities also don’t require it.
The definition of pressure pipelines is listed in the Catalogue of Special Equipment (No. 114, 2014)
The key is to consider the flammability of the asphalt. The MSDS states that it is flammable in the presence of open flames or high temperatures.
According to regulatory standard TSG D0001, only asphalt transport media that reach the standard boiling point can be considered pressure pipelines; yours does not meet the requirements for pressure pipelines.
It is sufficient to meet either of the two criteria: flammable liquids or liquids with a boiling point higher than the standard value. So what you said is wrong. Discussion is welcome
According to Annex A2.4 of regulatory standard TSG D0001, only Class C flammable liquids whose operating temperature is above their flash point are considered flammable liquids within the definition of pressure pipelines
Class C flammable liquids with a working temperature above their flash point are considered Class B flammable liquids; they are not considered flammable liquids as defined for pressure pipelines. Asphalt belongs to Class B flammable liquids. For asphalt cladding pipes in ordinary facilities, the pipelines between the storage tank and the pump operate under atmospheric pressure and by gravity flow; therefore, they do not qualify as pressure pipes ； And the height of the storage tank also needs to be considered. The asphalt pipe behind the pump then falls under the category of pressure pipes.