RP E On-Bottom Stability Design of Submarine Pipelines. General. This Recommended Practice replaces the following Veritec publications,. None. Hello you guys, I would like to know what are the differences between the two recommanded practices of DNV: DNV RP E and DNV RP. Revision: Edition, October ; Published Date: October ; Status: Superseded By: Superseded By: DNVGL-RP-E; Document Language: English.
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Based on the concrete coating thickness recorded in the final survey report, two regions one 3km and another 5km region of the pipeline were found to be unstable.
DNVGL-RP-E RP Design, testing and analysis of offshore fibre ropes – DNV GL
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Case Study: Assessment of pipeline on-bottom stability to DNV-RP-E and DNV-RP-F
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The as-built concrete coating thickness stated in the final survey report differed from the thickness given in the coating specification, therefore a re-assessment of stability was required. Click Here to join Eng-Tips dnb talk with other members! Promoting, selling, recruiting, coursework and thesis posting is forbidden.
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The tension versus stretch behaviour of synthetic rope, which is fundamentally different to that of steel wire rope. A major operator asked us to undertake a stability analysis of a 20″ trunkline to ensure the pipeline was stable.
Join your peers on the Internet’s largest technical engineering professional community. The strength and endurance of synthetic rope, which is fundamentally different to the strength and endurance of steel-wire rope on the basis that mechanisms are different.
For the remaining unstable 5km region, the stability analysis was re-assessed using the generalised lateral stability and absolute lateral stability methods outlined in DNV-RP-F To further reduce conservatism, an OrcaFlex analysis was performed by modelling a 1km section of the pipeline and applying the hundred year significant wave and ten year current using an irregular wave analysis JONSWAP wave spectrumwhich simulated a three hour storm.
By further attempting to reduce conservatism through DNV-RP-F and an OrcaFlex model, it was found that the second region remained unstable under the three hour storm conditions. The integrated system behaviour is also very important in offshore mooring. Therefore, recommendations were made to investigate the condition of the unstable pipeline region. For the 3km region, it was found that the as-laid water depth was greater than that used in the design.
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This showed the pipeline was unstable using these extreme storm conditions. It emphasises the following key aspects: By joining you are opting in to receive e-mail.
Offshore Fibre Rope should be analysed on the basis of amount of load-bearing material in the cross section, and the characteristics of the material used. The Eng-Tips staff will check this out and take appropriate action.
New DNV GL RP on offshore fibre ropes
Download Now Defense manufacturing is all about project manufacturing and project accounting. Register now while it’s still free! By verifying pipeline stability based on the as-built concrete coating thickness against the original stability design code, DNV-RP-E, it was possible to conservatively determine that one of the regions was stable.