DNV RP E305 PDF DOWNLOAD

Thepublications do not cover all areas of offshore technology, but are meant tosupplement the recognized codes and standards frequently used within theindustry. Risk and reliability of pipeline systemsEnvironmental loads for pipeline systemsStrength and in-place stability of pipelinesPipeline weight coating and corrosion protectionFlexible risers, pipe hoses and bundlesStorage, transportation and installationIn-service inspection and maintenance of pipeline systems. The environmental parameters for determination ofenvironmental loads may be established based on reliable weather forcasts. If a joint distribution of H, and Tp is available, then the combination of H, - Tpwhich gives the most extreme near-bottom conditions should be selected. Consequently the aim ofstability design is to verify that the submerged weight of the pipeline is sufficientto meet the required stability criteria. Volume A-E give guidelines on specific technical solutions, methods ofcalculations etc.

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For r; seas, theJonswap spectrum is given by: Phillips' constantsub-direction around main wave directionscaled lateral displacementengineering and generalized strainspreading functionpeakedness parameter in J onswap wave spectrumvon Karrnan's constantsoil friction factorangular frequencyangular frequency of spectral peakdensity of concrete coatingdensity of corrosion coatingdensity of internal contentdensity of sand soildensity of steel materialmass density of waterspectral width parametermain wave direction, phase angledirection perpendicular to the pipeline.

Post on Jan views. Duration less than 3 days: If no directionalwave information is available then the extreme wave pdv should beassumed to act perpendicular to the axis of the pipeline. Seastates will normally bedefined in terms of the significant wave height Hgspectral peak period Tp andcorresponding return probability.

DNV-RP-E On-Bottom Stability of Submarine Pipelines - [PDF Document]

Veritec has no liability for loss or damage caused by the use of this document if usedwithout the involvement ofVeritec. Normally extremeseastates from different directions will need to be considered.

A returnperiod of 1 year for the relevant season can be applied. Design of drilling and production facilitiesDesign of structuresDesign of pipeline systemsDesign of subsea production systems. These publications areconsidered as Recommended Practices related to offshore objects.

DNV-RP-E305: On-Bottom Stability of Submarine Pipelines

However, the relevant season should not be taken less than 2 months. If inadequate information is available on the jointprobability of waves and current, then the following are suggested for theoperational condition:.

Volume 0 gives guidelines on design of offshore objects.

E350 dominates forces Veritec RP E The number of positions necessary to adequately define the environment will bedependent on the length of the pipeline and the variations in water depth, seabedsoil and meteorological conditions. If no other information is available for the peak period,then the following relationship may be used for ldf upper limit: The Recommended Practice publications cover proven technology andsolutions which have been experienced by Veritec to represent good practice.

Consequently the aim ofstability design e3305 to verify that the submerged weight of the pipeline is sufficientto meet the required stability criteria.

The design method presented in this Recommended Practice relates to a pipelineresting on the sea bed throughout its lifetime, or prior to some other form ofstabilization eg. The environmental parameters should bedefined with a year seasonal return period.

DNVGL-RP-E305 Design, testing and analysis of offshore fibre ropes

Thepublications do not cover all areas of offshore technology, but are meant tosupplement the recognized codes and standards frequently used within theindustry. IV Facilities on offshore installations Structures Materials technology Risk and reliability of structuresLoads and conditionsFoundationSteel structuresConcrete structuresAluminium structures General safetyProduction and processing systemsInstrumentationElectrical systemsDrilling and well completionMechanical equipment and piping systemsFabrication of drilling, production and processing plantsHook-up and commissioningIn-service inspection and maintenance of drilling, productionand processing plants.

The main objectives of this recommended practice are to make the latest state-of-the-art information on pipeline stability available for use in the design ofsubmarine pipelines, and to provide a framework from which stability designmethods can be developed further as more information becomes available.

The number of positions necessary to adequately define the environment will bedependent on the length of the pipeline and the variations in water depth, seabedsoil and meteorological conditions. Risk and reliability of structuresLoads and conditionsFoundationSteel structuresConcrete structuresAluminium structures.

Within each group the RecommendedPractices are issued as selfcontained booklets. We will also like to thank the members from the industry who took their time tocomment and attend the review meeting on the draft version of the RP.

For long-crested seas, theJonswap spectrum is given by:. General safetyProduction and processing systemsInstrumentationElectrical systemsDrilling and well completionMechanical equipment and piping systemsFabrication of drilling, production and processing plantsHook-up and commissioningIn-service inspection and maintenance of drilling, productionand processing plants.

Embed Size px x x x x See table on next page. This Recommended Practice outlines the basic considerations with regard to thestability design of submarine pipelines.

DNVGL-RP-E RP Design, testing and analysis of offshore fibre ropes - DNV GL

To the extent Veritec is performing services in connection with the use of thisdocument, the liability of Veritec will be regulated in specific agreement between theclient and Veritec.

Veritec RP E Environmental conditionsGeotechnical conditions of the sea bedTopographical conditions of the sea bed eg, slope, rock outcrops,depressions Bathymetry water depth Pipe data diameter, wall thickness, concrete coating Location of pipeline restraints riser connections, crossings, etc Return Periods 1.

If no other information is available for the peak period,then the following relationship may be used for the upper limit:. On-Bottom Stability of Submarine Pipelines. The data may be frommeasurements, hindcast models, or visual observations.