Offshore Oil 292 is a new-generation deepwater multi-purpose offshore engineering vessel. It was named and delivered in Qidong, Jiangsu Province. JOSUN supplied the vessel’s air conditioning, refrigeration and ventilation systems as one integrated package.
The vessel
| Item | Value |
|---|---|
| Type | Deepwater multi-purpose offshore engineering vessel |
| Length overall | 126 m |
| Displacement | over 17,600 t |
| Positioning | DP-2 dynamic positioning |
| Propulsion | Azimuth electric propulsion |
| Navigation area | Unrestricted |
Design conditions
The vessel works for long periods in deep water far from shore. Salt-laden air, high humidity and wide swings in outdoor temperature all act on the environmental control plant. The air conditioning, refrigeration and ventilation systems were therefore laid out together, around the ship’s working scenarios and the functions of each space, rather than as separate packages.
What JOSUN supplied
Air conditioning
- A water-cooled chiller that cools and dehumidifies the cabins. It was chosen for its heat-rejection efficiency and small footprint.
- An indirect-type air handling unit. All heat and moisture exchange takes place inside the unit, and the treated air is ducted to each air-conditioned cabin.
- Cabinet-type air conditioners that give independent temperature control, with low noise, in specific areas.
- Split air conditioners that supplement temperature control in individual spaces.
Refrigeration
- A provision refrigeration unit that holds stores at a constant temperature for long periods at sea.
Ventilation
A full ventilation package covering the whole ship, with adjustable air flow:
- Axial fans and centrifugal fans
- Explosion-proof centrifugal fans
- Double-wall pipe fans and duct fans
- Fire dampers
How JOSUN lays out an offshore engineering vessel
The same article sets out how JOSUN arranges environmental control on this vessel type:
- Upper module (accommodation). Cabins, offices and the mess are served by a medium-velocity, medium-pressure, single-duct central air conditioning system, air-cooled or water-cooled. The wheelhouse and galley have their own units, either CCU + AHU air-cooled split units or water-cooled packaged units. Provision refrigeration is also located in this area.
- Hull. The engine control room and electrical workshop have high equipment heat loads and are served by independent water-cooled packaged units. The hull also has cabin ventilation and engine room ventilation systems.
JOSUN applies the same approach, with different equipment splits, on offshore platforms, FPSOs and offshore support vessels.
Delivery
The environmental control package was completed with the ship, and Offshore Oil 292 was delivered in Qidong. For other offshore projects that JOSUN has supplied, see the project list.