Design and Analysis of Subsea Spool and Pipeline in Natuna Sea
Nafisa Nandalianadhira dan Ricky Lukman Tawekal
Program Studi Sarjana Teknik Kelautan
Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung
Jalan Ganesha 10 Bandung 40132
nandalia.nafisa@students.itb.ac.id dan ricky@ocean.itb.ac.id
Abstract
Subsea pipeline system has many components, Spool is one of the component mentioned, it is a component that absorbs thermal expansion for the pipeline system. Spool is a component that needs to be analyzed in detail for it is a component that is susceptible to damage. If the subsea pipeline system is having faulty or damage it can cause economical loss and environmental damage, therefore proper design calculation and analysis is mandatory. Designing process and analysis is based on a number of design standards. Aforementioned designs chosen to be done are calculation of pipe wall thickness design and concrete layer thickness design. Continued to static installation analysis, free span analysis, and stress analysis of subsea spool. Pipe wall thickness is determined based on four criteria from the DNV-OSF101 design standard. The largest value of the pipe wall thickness then to be set as the wall thickness design based on the API 5L standard. On-bottom stability analysis will decide the concrete layer thickness of the pipe. This layer will help the pipe stability under the sea water. Pipeline stability analysis is based on the DNV-RPF109 and DNV-RP-E305 design standards. After that, the configuration of the stinger and the ramp roller on the lay barge for the installation of the pipeline can be determined from the result of the installation analysis done before. The design then continued with free span analysis that is based on the DNV-RP-F105 and DNV 1981 design standards. From this analysis, the allowed free span of the pipe will be acquired. All of the design process will be done in three conditions, those conditions are the installation, the hydrotest, and the operation. In this thesis, the value of the pipe wall thickness is 18 mm and this number will be used in the spool analysis. The stress of the spool analysis is checked so that it meets the allowed stress.
Keywords: free span, on-bottom stability analysis, spool, subsea pipeline, wall thickness.
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