LPG loading flow rate
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Regarding the control of the flow rate of liquefied gas during loading, the GB51142 standard requires that the flow rate of liquefied gas in the pipelines not exceed 3 m/s, but does this standard apply to the loading nozzles as well? Furthermore, this standard does not apply to refinery tank farms either. I would like to ask everyone, what is a suitable flow rate for loading liquefied gas onto vehicles?
According to the standards, the flow rate in the liquefied gas flexible hose should be even higher, but it is not recommended to choose an excessively high flow rate as it is unsafe; a flow rate of 2-3 m/s is sufficient if it is controlled through pipes
Since the size of the liquid pipeline in the flexible hose is DN50, with a loading rate of 50 cubic meters per hour, the flow velocity actually exceeds 7 meters per second.
That’s how it is. In fact, the design specifications for loading and unloading also state that when the liquid level exceeds the pipe opening, the flow velocity at the outlet of the dip pipe should be less than 7 m/s. In actual production, however, some people violate these regulations in order to improve efficiency. High flow rates require good grounding; otherwise, accidents are likely to occur.
Which loading and unloading design standards are you referring to? Is it suitable for loading and unloading liquefied gas in tank trucks?
Code for design of railway loading and unloading facilities for petrochemical liquid materials GB/T51246-2017
But does this standard apply to loading vehicles? At the same time, I think a flow rate of 7 m/s is mainly applicable to liquid materials – is it suitable for liquefied hydrocarbons as well?
There are no specific regulations for the loading and unloading of vehicles, and these rules also apply to liquefied hydrocarbons. You can also refer to the \"Code for Design of Urban Gas Systems\" and the \"Regulations on Static Electricity Safety for Liquid Petroleum Products\"; the latter contains specific provisions regarding liquefied gas. The numerical values may not be exactly consistent, but the differences are not significant