| Author | Sitthipong Angkapunyadej |
| Call Number | AIT Thesis no.OTM-08-03 |
| Subject(s) | Offshore structures--Vibration--Thailand, Gulf of
|
| Note | A thesis proposal submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Offshore Technology and Management, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. OTM-08-03 |
| Abstract | Minimum non-jacket structures are suitable for marg inal oil and gas fields with reducing cost of the whole project. Minimum non-jac ket structures, which provide less reserve strength and redundancy than conventional j acket type structures, show unsatisfactory performance to satisfy vortex sheddi ng and human performance on the topsides. The specific objectives of the study are to design suitable minimum platform structures for the marginal fields in the Gulf of T hailand and to investigate the suitability of the structures against Vortex Shedding induced V ibration (VIV). According to the definition specified in API-RP2A WSD Edition 2005, five models of the minimum non- jacket structures are applied for the study. The wa ter depth of 20-40 meters and the soil data are generic for studying the effects of the wa ter depth and the soil data to serviceability criteria and vortex shedding. The in vestigation of vortex shedding effect is only on the detection of the possibility of the occ urrence of VIV on the structures. The results are presented as frequencies in each mode. The occurrences of VIV both in-line and/or cross-flow are verified following DNV criter ia. The dynamic amplification factors are plotted to clearly show the position of occurri ng the resonance on the member. Minimum non-jacket structures are suitable for marginal oil and gas fields with reducing cost of the whole project. Minimum non-jacket structures, which provide less reserve strength and redundancy than conventional jacket type structures, show unsatisfactory performance to satisfy vortex shedding and human performance on the topsides. The specific objectives of the study are to design suitable minimum platform structures for the marginal fields in the Gulf of Thailand and to investigate the suitability of the structures against Vortex Shedding induced Vibration (VIV). According to the definition specified in API-RP2A WSD Edition 2005, five models of the minimum non¬jacket structures are applied for the study. The water depth of 20-40 meters and the soil data are generic for studying the effects of the water depth and the soil data to serviceability criteria and vortex shedding. The investigation of vortex shedding effect is only on the detection of the possibility of the occurrence of VIV on the structures. The results are presented as frequencies in each mode. The occurrences of VIV both in-line and/or cross-flow are verified following DNV criteria. The dynamic amplification factors are plotted to clearly show the position of occurring the resonance on the member. |
| Year | 2008 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. OTM-08-03 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Offshore Technology and Management (OTM) |
| Chairperson(s) | Widjaja, Joko H. |
| Examination Committee(s) | Worsak Kanok-Nukulchai;Pennung Warnitchai |
| Scholarship Donor(s) | Thai Nip pon Steel Engineering and Construction Corp.,Ltd. |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2008 |