What is the design pressure for pipelines in the storage and transportation industry?
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Gentlemen, what is the typical operating pressure for pipelines in the liquefied gas storage and transportation industry? I think the pressure in the pipelines at the terminals is higher; is it determined by the outlet pressure of the loading pump, or by the nitrogen pressure used during pipeline cleaning? The operating pressure of the loading pipeline is lower, because there is no gas flow – is it the nitrogen purge pressure? Then, is the design pressure of the pipeline calculated as 1.1 times or 1.5 times the operating pressure? In actual operation, the pressure for loading and unloading ships via pipelines at the dock is generally around 0.5 MPa, while the pressure for loading onto vehicles is around 0.35 MPa. But what is the basis for design?
The design pressure generally needs to be determined through comprehensive consideration, by taking various operating conditions into account. For example, the saturated vapor pressure of the material in the pipeline, the shut-off head of the loading pump, etc
Of course, economic considerations also need to be taken into account; investments should not be expanded blindly, nor should too much emphasis be placed on design pressure values at the expense of considering the impact on pipe material selection and inspection
I think what you said is too general; design pressure is closely related to the medium. The normal pressure for loading conventional media is around 0.3 MPA. But for things like liquid ammonia, the pressure needs to be much higher.