Subsea Gas Pipeline Risk Assessment during Hot Tapping Installation  

Oleh:

Artana, KB ; Ariana, I Made ; Dinariyana, AAB ; Handani, Dhimas Widhi ; Pratiwi, Emmy

Jenis: Article from Journal - ilmiah nasional - terakreditasi DIKTI
Dalam koleksi: IPTEK: The Journal for Technology and Science vol. 27 no. 2 (Aug. 2016), page 40-46.
Topik: Penilaian Risiko; DNV-RP-F107; Hot Tapping; Risk Assessment; DNV-RP-F107; Hot Tapping
Fulltext: 1294-3528-1-PB.pdf (549.33KB)

Isi artikel

This paper examines the risk to subsea gas pipeline during hot-tapping installation process. Hot tapping is one method to connect new pipeline to existing pipeline while they remain in service. In this study it is considered that hot tapping is installed using crane barge. To assure the crane barge in steady position, the crane barge is moored by means of mooring chain at several locations. These mooring activities and hot tapping installation possess potential risk to existing subsea facilities. Hence, in general there are two objectives in this study. Firstly, determining the safe distance between mooring chain for and the existing facilities. Second obcjective is performing risk level due to external load that may occurs during installation. If the risk level is unacceptable, some mitigations will be suggested. The risk level is determined by analyzing frequency and its consequence then will be mapped into risk matrix according to DNV-RP-F107. From mooring distance analysis, the result can be used as a reference for positioning the mooring point of crane barge. Based on the result of risk assessment to facilities, risks due to external load such as dropped anchor, dragged anchor, ship sinking and dropped object are in the As Low As Reasonably Practicable (ALARP) region which mean, in the practical life risks are acceptable as long as the frequency is maintained in the lowest rank.

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