1. DP Workboats; a new era for Multicat type vessels
DP Workboats;
An new era for multicat type workboats

2. Profile
• Owner and operator of 40 workboats for coastal waters
• 40 years experience
• Independent company with a global presence
• Standard & custom built vessels
- Ultra shallow water
- Cable & pipeline (re)burial
• Headquarters in Den Helder, The Netherlands

3. Our fleet AH tugs
Our fleet
Survey Multicats Crew Tenders
Multipurpose support Shallow-draft Supply Truckable

4. Dynamic Positioning on workboats
• 2007, Acta Marine was the first operator installing DP on
workboats
• Currently 4 DP vessels in operation
• All vessels are ultra-shallow draft (draft < 2,0 m.)
• DP workboats are competing with standard OSV / PSV DP 2
vessels at a competitive workboat charter rate.

5. Thruster set-up for Acta Marine workboats
For excellent position holding capabilities the DP workboats are
equipped with:
• Stern: 2 x fixed propellor & 1 x 360˚ rudder propellor
• Bow: 1 or 2 x 360˚ horizontal propellor/jet

6. Workscope for DP workboats
Backfil of trench;
• Nordstream Pipeline, soil layers of 25 cm where backfilled in the trench
• Maasvlakte 2, shallow area spray pontoon
C.Discovery- Nordstream

7. Workscope for DP workboats
Water jetting;
Maasvlakte 2, cleaning breakwater for the installation of
an additional concrete blocks layer

8. Workscope for DP workboats
Offshore Oil & Gas maintenance;
• Change out Offshore oil bunker hose GDF SUEZ EP
• Removal and installation of splash zone constructions

9. Workscope for DP workboats
WID / Mass flow trenching;
Removed 30.000m3 sand per day in the port of Sidi Ifni Morocco

10. Workscope for DP workboats
WROV Support platform;
Explosive Ordnance Disposal German Wadden Sea OWF export
cable route

11. Workscopes for DP workboats
Vibrocoring/CPT survey;
Murmansk Offshore pipeline route Sthokman field

12. Additional workscopes for DP multicats
• Trenching with mobile trencher unit
• ROV support platform
• Accommodation (12 additional to vessel crew)
• Diving from 4p c/t anchor spread
• Offshore access to constructions
• (Heave comp) Crane works
• Cable laying
• Cable burial
• Cable survey
• Cable recovery and jointing
• Cable protection deployment (Mattresses etc)
• TP cable protection installation (Messenger wire technique)

13. NON DP Cable & Pipeline (re)burial
Remedial lowering of cables / pipeline
● Post-lay technology
- suction dredging with jetting
- 4-point mooring
- Life tracking of burial process
● Very effective and safe for
shore-ends, crossings and exposed
parts.
● Succesfully applied on “live” gas
pipelines and power cables.

14. Ultra shallow water specialism
Wadden Sea is our backyard

15. Thank you for your attention
Acta Marine B.V.
Het Nieuwe Diep 39d
1781 AE, DEN HELDER
The Netherlands
T +31 (0)223 615666
www.actamarine.com