Precise Calculation and General Distribution of the Vertical Curves for Buried Pipelines

Creeping of long buried pipelines leads to the formation of vertical plane corner.lt is required to make vertical curve connection at the corner in order to assure safe operation of pipelines.The metbods followed previously to design the distribution of pipeline vertical curve were those as recommanded in"Circular Vertical Curve Distribution Table"and"Trunk Gas Line Design Manual", which could not guarantee the accuracy as required owing to the error existing between the calculated and the actural values, Here is now induced the precise formular for distribution of the vertical curves based on the tangen offset theme which is more accurate, able to take as required and fit for all kinds of such calculation. Pointing out the root where by to lead to errors by using the conventional method, it explains in detail the inductive process of the accurte formula calculation and requirement in practice, which are of referential value to the design personel engaged in pipeline engineering.