The PSB 5500™ anti-terrorist system employs a continuous net capture system supported on a pontoon structure. It was
developed by the US Navy to be used when maximum security is required.This marine barrier system has the highest ultimate stopping energy (9.09M ft lbs/12,337 kJ) and working stopping
energy (5,500,000 lbf/24.46 MN) of the Harbor Offshore Barriers’ anti-terrorism systems.

The PSB 5500 maritime security system is designed to stop:

  • Fast Inshore Attack Crafts (FIAC)
  • Boat-Borne Improvised Explosive Devices (BBIED)
  • Multiple boat and swarm attacks
  • Intruders at full power before, during, and after impact
  • Slow speed, heavy tonnage vessels
  • High speed, lower tonnage vessels

PSB 5500 Barrier System – Energy Absorption and Stopping Power

  • Ultimate stopping energy 9.09M ft lbf/12.33 MJ
  • Working stopping energy 5.49M ft lbf/7.44 MJ

Constructed System

  • PSB 5500 unit length is 50 ft (15.24 m) and 40 ft (12.19 m) units are available.
  • Pontoons are made from High Density Polyethylene (HDPE) that is corrosion free and resistant to UV exposure for 50+ years.
  • Pontoons are usually 1.75 in (4.45 cm) in thickness and 40 in (106.68 cm) in diameter subject to conditions, customer requirements or other factors.
  • Pontoons can be supplied in either parallel or perpendicular design.
  • Netting is attached to a galvanized steel beam that runs from pontoon to pontoon.
  • Netting is constructed of steel, stainless steel or synthetic materials and generally rises 9 ft (2.74 m) above the water line.
  • Netting is attached to a galvanized steel beam that runs from pontoon to pontoon with 7 net warps per unit.
  • Total unit weight is 6,000 lbs (2.7 tons).
  • Under 106-knot wind and 4-knot current broadside conditions, withstands 2,540 lbf (11,298.42 N).
  • Anchors vary by type and size depending on engineering requirements.
  • Shore connections and subsurface anchors are designed to accommodate large fluctuations of water levels at dams, high currents and up to 30 ft (9.14 m) ocean tidal cycles.
  • Connection units and latches are of proprietary design under license from the US Navy to handle continuous motion and heavy loads.
  • Parts and connections are interchangeable.
  • Gate systems built to client needs.


  • Durability – HDPE pontoon’s thickness and diameter produce structural strength sufficient to withstand the weight of the heavy steel beam and netting so that the entire system can stop high-energy vessels.
  • Low maintenance – uses composite materials, is a simple system structure, and has as few parts as possible to support easy and low-cost inspection and maintenance.
  • Low operational cost – making the system light and keeping the wind, current, and wave loading on the system as low as practical gives operators the ability to easily open/close gates.

Expertise and Service

  • Expert installation – teams include divers and marine constructors with over 30 years of experience working with each other.
  • Anchor placement and mooring arrangements – placing anchors on the seabed requires skills that few teams can offer.
  • Fosters local partnerships – local sub-contractors join the team when qualified, gaining work skills and technology training.
  • Life-cycle value – team experts provide life-cycle cost estimates to be used in formulating investment and insurance calculations and in selecting the system that meets the customer’s needs.

Download the PSB 5500 Heavy-Duty Fact Sheet

For more information on our Maritime Security Barrier Systems, please click here.