Keywords : focus, deck, equipment

Focus on the Deck Equipment

The deck equipment

Quarterdeck and hanger : a deck designed around the devices

The quarterdeck and hanger of the Pourquoi pas? are areas for:

  • accomodating and deploying two successive submersible devices, such as the Nautile, Victor or Penfeld,
  • deploying the MultiTrace seismic surveyor (with future developments taken into acount) which requires a large number of containers (12) to be set up on the quarterdeck,
  • carrying out hydrographic missions in deep and coastal waters with, in particular, three SHOM hydrographic launches onboard, two of which are sat on their own davits and one which is deployed by the stern A-frame,
  • deploying the French navy's Newtsuit system (CEPHISMER) to assist military submarines in distress. This system consists of a manned intervention device, an assistance ROV and a ventilation system.

To fulfill these needs, the Pourquoi pas? has a huge quarterdeck (28m long and 20m wide), extended by an enclosed hanger of 18m in length, capable of housing at least two devices. The quarterdeck and the hanger are crossed by two transportation tracks allowing the devices to be moved from the storage areas in the hanger to their handling area.

There are two handling areas:

  • a rear handling area, served by the stern A-frame,
  • a lateral handling area, laid out on the starboard side, directly outside the hanger. The oceanographic crane and the lateral telescopic beam are used in this handling area.

The stern A-frame is designed for launching the manned NAUTILE submersible, unmanned devices with or without towed devices (Victor, Penfeld, Sar), a hydrographic launch and various scientific instrumentation including rock dredgers and mooring lines. The A-frame can be fitted with two complete handling systems in order to successively operate two submersible devices which, due to their design, must be deployed at the stern of the ship (towed devices, Nautile, etc.). It has a 22t capacity in accordance with the BV ALS standard. It is fitted with a total of 7 winches, including 2 hoisting winches for unmanned devices (SWL 10t), one Nautile hoisting winch (SWL 22t) and 4 winches for hanging/taking down deep-water pulleys (SWL 1t).

The oceanographic crane is equipped with a complete assembly for launching and recovering Victor and Penfeld type devices (landing platform, constant tension winches and a device to dampen dynamic effects). It is also capable of handling light loads, of around 2t (like a shuttle lift, stations, OBS, dinghies, etc.). Besides these device-specifc characteristics, it can also be used for standard handling operations. Its capacity at sea is 8t at 13m or 5t at 15m

The lateral telescopic beam is used to support the deep sea cables (for Victor, Penfeld or the core-sampler, for example). Its maximum towing strength is 15t. It is also fitted with two winches (2t and 8t) for core-sampling operations.

The ship has two general handling cranes, one on the port side on deck 4, the other on the roof of the hanger on deck 6.

The core-campler gangway is in front of the quarterdeck, on the starboard side. At 40m long, it is fitted with all the devices (davits) for deploying the CALYPSO core-sampler (30m).