Dry chemical powder system
The Unitor dry chemical powder fire extinguishing system (Unitor DCP system) is designed for use on “B” and “C” class fires. The system uses dry powder which breaks down the chemical reaction within the fire and subsequently suppresses the flames almost immediately?
- Proven time release and capacity capabilities
- A wide range of pressure vessels for powder are available to meet the demands for various system sizes
- Can be deployed by hand held hoses, fixed monitors, or a combination of both
- Up to 190 meter pipe and 33 meter hose for handheld pistol
- Up to 140 meter pipe for monitor
- Tested in minus 28 °C in long pipes
- Provides complete coverage to all the areas that need protection
- Powder penetrates into the smallest and even partially covered locations
- Can be installed as a central-, modular- or hybrid system
A cost effective solution
- Designed to keep material and installation costs low
- Standardised system components minimise maintenance and operational cost
- Modular units provide a flexible solution, reduce piping routes and eliminate the need for distribution piping
- Components can be installed on skid for reduced installation time and cost
Where can the system be used?
Liquefied gas carriers
LNG fuelled vessels
The Unitor DCP system consists of steel pressure vessel(s), cylinder banks with manifolds, distribution valves, gas release arrangements, hose stations, monitors, pressure gauges and safety valves.
Hose stations are located on deck in a way that every part of the deck area can be reached with two hose stations. The hose stations consist of local release arrangement and 33 metres of hose with a powder pistol. Monitors are located to protect cargo manifolds and can be released locally and remotely. The system can be installed as central, modular or hybrid system (which is a combination of the two).
The central system is designed as a single or twin storage pressure vessel located centrally inside a powder room. It feeds powder from the central powder storage tanks through piping systems on deck to the hose stations
and monitors. The Unitor DCP system has capacity to cover the whole deck area with powder, or the flexibility to discharge all powder to cover one single area.
In modular systems each hose station unit and monitor unit has its own self-contained powder storage vessel.
Activation of the system
When the system is released, nitrogen gas pressurises the tank, and nozzles fitted in the bottom fluidize the powder. When a certain pressure is achieved, the dry powder flows through the distribution manifold to the monitor or hand hose line.
There are two ways to release the system to ensure system operation even if one unit fails to work:
- Remotely operated from the release boxes utilising pilot cylinders
- Manually operated at the dry powder unit
Rules and regulations for DCP systems
The new IMO regulation requires the powder used to be based on Potassium Sulphate and that testing is carried out with this type of powder. Potassium Sulphate offers better compatibility with foam compared to the historical choice, Sodium Bicarbonate and hence the system can be used together with foam fire-fighting systems.
The regulation also states that any Type Approval test shall be carried out using the same type of powder that will be supplied with the unit, a test the Unitor system was able to satisfy.
Germanischer Lloyd was selected to witness the testing for the Unitor DCP system. GL requires Type Approval of shipboard equipment for all the ships it classes, regardless of their flag state so the result would have a wider impact than on European Union flag ships.
Further approvals are being considered by other Flag States and Classification Societies in order to adopt the test standard into their requirements.
The Unitor DCP system is extensively and independently tested:
- MED -B & -D certified, fulfilling the mandatory IMO MSC.1/Circ. 1315
- GL type approval certificate
- DNV QS - Certificate of assessment - EC
- Complies with SOLAS and approved by major classification societies
- Complies with IMO IGC Code Ch. 11-4
- Complies with IMO IBC Code Ch.17
The system can be applied on merchant marine and offshore structures as design is in accordance to IGC or IBC code and IMO MODU Code
In addition the Unitor DCP system is tested down to -28C and in 190 meter + 33 meter pipes and hoses.