Project Overview
Beyond individual flagship projects, Grispen has built a substantial and recurring seafastening engineering practice across more than 15 separate heavy marine transport scopes for multiple EPC contractors. This body of work spans mudmats, rigid jumpers, suction piles, spools, SFL carousels, bellmouths and structural frames, transported by barge, OSV and heavy lift vessel.
The Engineering Challenge
Seafastening is frequently the most schedule-critical and underestimated scope on an offshore project. Each cargo type and vessel combination presents distinct vessel motion, load distribution and structural interface challenges, while project schedules typically allow narrow windows for Marine Warranty Surveyor review and approval before a fixed vessel departure date.
Grispen's Solution
Grispen has developed a mature, repeatable seafastening engineering methodology, applied consistently across clients including LLOG, Anadarko, BP, Chevron and QuarterNorth Energy. Our packages consistently include complete Design Basis documentation, vessel motion analysis, structural calculations to AISC 360-16 and DNV-ST-N001, and fully detailed fabrication drawings, delivered within the tight windows that offshore transport schedules demand.
Scope of Work Delivered
- Mudmat and MRDS seafastening (LLOG Buckskin, Gulf of Mexico)
- Suction pile and rigid jumper seafastening (Anadarko OXY K2)
- Spool and structure seafastening on OSV/barge (BP TOPR)
- SFL carousel, HPU and HDU seafastening (Chevron Anchor)
- Bellmouth and SFL seafastening (QuarterNorth Energy Gunflint)
- 15+ completed seafastening scopes across multiple operators
Our Delivery Process
Every Grispen engineering scope, regardless of size or client, passes through the same structured five-stage delivery method, ensuring consistent quality and full traceability from kick-off to final issue.
This recurring seafastening programme is perhaps the clearest evidence of Grispen's reliability: EPC contractors do not return for repeat seafastening engagements unless the prior packages cleared Marine Warranty Surveyor review cleanly and on schedule, every time.