Page 47: of Offshore Engineer Magazine (Dec/Jan 2013)

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Subsea

Base Case – conventional fowline with

Tie-in cost comparison Pipeline cost comparison 60 300

SliPipe RFO, Engineering lateral buckling design and long spools.

costs & Operator 50 250

SliPIPE 1 – same as base case but SliPIPE

SliPipe costs 40 200

Spool at ends and short spools

Spool material material & tie-in 30 150

SliPIPE 2 – same as SliPIPE 1 but lateral & tie-in

Survey & Seabed 20 100 buckling design replaced by midline

Invention

Costs (MNOK)

Costs (MNOK)

Pipeline 10 50

SliPIPE components.

installation

SliPIPE 3 – same as SliPIPE 1 but spools 0 0

Line pipe

BaseSliPIPESliPIPE BaseSliPIPESliPIPESliPIPE & coation entirely replaced by “direct tie-in”.

1 3 1 case 3 case 3 method, or 10% compared to a typi- to minimize end expansion, external In constructing this concept, DNV GL cal installation of 10km pipeline using forces, and bending movements acting on has taken into account comments from conventional lateral buckling design and it. Alternatively, a direct tie-in (without industry and academia to address and tie-in methods. a PLET and short tie-in spool) is also overcome challenges around this issue,

Several practical issues that will infu- feasible, with the use of a suitable subsea and is determined to further develop the ence how SliPIPE operates have been installation guide. SliPIPE technology through to commer- studied, and ways to overcome these are In the direct tie-in method, SliPIPEs cialization and deployment. being looked into. have to be locked to restrict any uncon-

As a concept, SliPIPE is suitable for trolled movement and the lock released Chia Chor Yew is installing tie-ins between a submerged before tie-in. SliPIPE must be designed head of department, rigid pipeline and a subsea well, subsea to have at least the same capacity as the subsea, structures structure, or riser, typically from 10.75- adjacent linepipe, which has already and pipelines, DNV to 24in (273-610mm) in diameter. been designed to resist the maximum GL Singapore. He has

This may be pre-installed on a pipeline tensile forces and bending movements. 31 years’ experience end termination (PLET), which is then As a relatively simple yet effective in structural, civil transported and installed offshore on the alternative to traditional giant tie-in and pipeline end of the pipeline, lowered onto the sea- spools and expensive post-installation engineering, mainly related to the bed and connected to a manifold, or riser subsea intervention, analysis shows offshore and marine industry. He has a via a short tie-in spool. A misalignment SliPIPE could potentially offer cost sav- BSc and MSc in civil engineering from fange may be included. This is designed ings in material and offshore installation. the National University of Singapore.

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DELMAR SYSTEMS, INC.

Technical and Engineering

Delmar Systems, Pty. Ltd.

Operations and Headquarters

Perth, Australia 900 Town & Country Lane, Ste 400 8114 West Highway 90

Houston, Texas USA 77024

Broussard, Louisiana USA 70518

Delmar Sistemas de Ancoragem, Ltda.

Tel: +1 832.252.7100

Tel: +1 337.365.0180

Rio de Janeiro, Brazil

Fax: +1 832.252.7140

Fax: +1 337.365.0037 years 45 www.delmarus.com oedigital.com December 2013 | OE 49 048_OE1213_Subsea2_SliPIPE.indd 49 11/22/13 7:03 PM