Silvercrest Submarines are the UK's premier submarine, submersibles and ROV sales and charter company with contracts performed worldwide..

A one atmosphere manned submersible designed for all commercial activities, scientific research, underwater filming, search and salvage.

Statistics:
Operating Depth: 1000ft (300m).
Crew: three.
Weight: 8 tons.
One large front viewport, plus six small conning tower viewports. Fitted with external lighting, manipulator arm, communications and sonar system.

PERRY SUBMARINE SPECIFICATIONS.

The Perry submersible is a utility submarine designed for observation and manipulator tasks in 1000ft (300m) of seawater. The submarine also has a diver lockout capability to 650ft (200m). The submarine has two compartments. The forward compartment can accommodate a pilot and two observers. The aft compartment (DLO if fitted) can accommodate two divers, or two passengers. The two compartments are connected by an internal hatch with a viewport. An external hatch arrangement is located beneath the DLO, to allow diver entry/exit into the water as required.

GENERAL SPECIFICATIONS.

Length                                          22ft (6.71 m)

Breadth                                        8ft (2.39 m)

Height                                 8ft (2.40 m)

Weight                                          12 tons

Crew                                            3 to 5(normal). Three crew plus two divers (in DLO mode).

Life Support                                  4 days

Max. depth                                   1000ft (300m)

Payload                                        750lb (340kg)

Max. Speed                                  3 knots

Range                                           8 hours at 1 knot.

Duration                                       8-10 hours

Power                                         120vdc (31kw) 24vdc (6kw)

Main Propulsion                            10hp electric motor (180 degree swivel).

Directional Thrusters                     3 x 70lb (32kg) thrust.

TRIM

Internal variable buoyancy trim tank system. Forward tank 200lbs capacity, Aft tank 500lbs capacity. One H.P. overboard discharge pump, with appropriate valving.

HP. AIR

A high pressure air system of 740scf at 3600psi in two externally mounted cylinders, for blowing ballast tanks, and supplying built in emergency breathing system.

CONSTRUCTION

Pressure hull constructed of low temperature service steel, modular sections of 54 inches with internal ribs.

Battery pods, cylindrical of 20inch (50 cm) 0.D. with removable pressure sealed domed ends for ease of access to batteries.

Viewports. 8 off 8inch (20 cm) diameter equally spaced around the conning tower, and one upward looking port in the top centre of the hatch. Forward spherical segment window 36inch (91 cm) in diameter. All viewports are clear acrylic plastic.

Through hull fittings via removable penetrator plates. Four basic types of penetrators are used with several blanked spares for additional equipment functions.

All external equipment and fittings are protected by heavy-duty fender rails.

Main Hatch has 20inch (50cm) freeboard in normal surfaced state.

BUOYANCY

External ballast tanks of 1000lbs (453.5 kg) total capacity with H.P. air system for blowing the tanks for surface stability and buoyancy.

VENTILATION

The one-atmosphere environment is monitored by C02 and oxygen analysers. The CO2 is removed by an electric powered scrubber unit, the oxygen content is maintained from externally mounted cylinders.

HYDRAULIC

An electric hydraulic pump and accumulator system provides power for the actuation of planes, rudder, manipulators and other external hydraulic devices.

CONTROLS

At the pilots position is the portable control box with joystick, for rudder and planes, switches for main propulsion and thrusters. The pilot has at hand all the instrumentation for power distribution and monitoring in both normal and emergency situations.

STANDARD EOUIPMENT

Navigation: Compass, Depth gauges, Sonar, Pinger, tracking transponder (by Request).Communications: Mesotech underwater telephone (27kz). VHF radio for surface use. External lights: 4x 600watt Ouartz Halogen iodide. Cameras: Video + 35mm still camera (by request). Manipulator: One hydraulic multi-function 75 lb (34 kg) capacity.

SAFETY FEATURES

Ejectable battery pods. Leak detectors in battery pods warn of saltwater ingress. Pressure detectors warn of leaks in shaft seal. Built in Emergency breathing system, masks, and life vests. Fire extinguishers. External equipment faired to reduce drag and prevent fouling. Self powered flashing strobe light.