The PIPE computer program is a design tool for on-bottom submarine pipelines, which calculate the submerged pipe weight to meet specified design criteria.
The PIPE computer program is based on the use of non-dimensional parameters which allow scaling of the environmental load effects, the soil resistance and the pipeline response (lateral pipe displacement). The PIPE computer program was initially developed as a part of a comprehensive research program PIPESTAB, and has been further revised as a consequence of the development of new models for the hydrodynamic and soil-force description.
The design philosophy allows for limited movements of the pipeline during extreme environmental conditions.
The design process utilizing the program starts with a definition of a long-term wave environmental description. Three main options are possible. The first option is based on utilization of a scatter diagram of significant wave height, Hs, and the peak period, Tp. The second option is based on an analytical model for the long term distribution of Hs and Tp. The third option fits a Weibull distribution based on the definition of wave height and spectral peak wave period for two return periods. Wave directionality and shortcrestedness can be specified for all options.
The long term wave elevation data are transformed to water particle velocity data as significant amplitude and upcrossing period of water velocity at the seabed. These data then form the basis for the description of the long term hydrodynamic loading process, and are used by the program for the pipeline stability design according to the specified design criteria.
Two principally different design checks are made for the stability control of the pipeline:
Pipe program overview
The general procedure for stability calculation in the PIPE program can be summarized as follows:
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