Dry powder extinguishing method for fire protection onboard chemical tankers
Many new chemical tankers use dry powder extinguishing system as the main fire fighting method in the
cargo tank extinguishing area.
There are to be found centralized powder systems with possibilities of discharging several thousand kgs of powder. Release boxes and hose reels are strategically located on deck so that any point can be reached by two hoses, each being usually max 25 m length. On smaller vessels self-contained powder containers of 1000-3000 kgs are located in small deckhouses.
There are to be found centralized powder systems with possibilities of discharging several thousand kgs of powder. Release boxes and hose reels are strategically located on deck so that any point can be reached by two hoses, each being usually max 25 m length. On smaller vessels self-contained powder containers of 1000-3000 kgs are located in small deckhouses.
As mentioned above the IMO-Code accepts dry powder as equivalent to foam. Dry powder has decided limitations,
which are explained below.
The extinguishing effect of dry powder originates mainly from an inhibiting effect on the combustion. The smothering and cooling effects are small.
Dry powder has a particularly good extinguishing effect on larger volumes of burning gases and strongly vapourizing liquids, as compared with other means of fire fighting. But it has virtually no cooling effect on any steel, cargo liquid or other matter that has become heated from the fire. Once the flames have been thrashed out with dry powder there is a great risk for a fire back flash which can be more violent than the original fire. At a major fire therefore, the fire area should be cooled down with water fog as much as possible prior to application of powder.
Water cooling must be continued after the flames have been extinguished If a fire can be fought immediately after its outbreak and only little heating has occurred one should of course immediately start with dry powder, not awaiting water fog assistance.
Common types of dry powder have a tendency to break down a foam layer. Therefore the two methods should be avoided being used together. Some new powders are claimed not to have this deteriorating effect on foam. Always place two dry powder extinguishers at hand on deck aft of the cargo manifold, when loading /unloading.
Summarized below are recommended fire fighting methods for modern chemical tankers:
Total flooding method for seagoing chemical tankers
Water extinguishing method for fire protection
Foam extinguishing method for chemical tankers
Dry powder fire extinguishing method
Related Info:
Controlling the atmosphere in cargo tanks with nitrogen supplied from shore
How to determine the level of a liquid in a chemical tank
Poisoning and required first aid treatment onboard
After tank cleaning gas freeing safety guideline for chemical tankers
Draegar safety tube prior entering enclosed spaces
Preparations prior allowing personnel into cargo tanks / enclosed spaces
How to rescue injured or unconscious person from enclosed spaces
Preparations for hot work and safety precautions
Tank cleaning fatality- case study & lessons learned
Tank cleaning and poisoning hazards
Testing of tanks and cargoes
Practical tank cleaning methods for various noxious liquid cargo
Special tank cleaning method
Determining proper tank cleaning by acid wash method
Supervision of all tank cleaning and gas freeing operations
Disposal of tank washings, slops and dirty ballast - safe method
Following reference publications provide useful guidance and international regulations for carrying hazardous chemicals at sea.
Our detail pages contain somewhat larger lists of resources where you may find more useful information.
Main Info pages!
Home page ||| Chemical hazards ||| Cargo planning & Stowage ||| Cargo loading ||| Cargo documents ||| Safe stability ||| Cargo care ||| Preparation for unloading ||| Inert gas systems |||Gas freeing ||| Nitrogen handling ||| Chemical handling Safe practice |||Handling equipments ||| Cargo & Ballast pumps ||| Cargo tanks |||Tank cleaning |||Special cargoes |||Spills emergencies |||Fire protection
Chemicaltankerguide.com is merely an informational site about various aspects of chemical tankers and safety tips that may be particular value to those working in: Chemical Handling, Chemical Storage, Liquefied Chemical Suppliers, Chemical Shipping, Chemical Transportation, Chemical Terminals, Bulk Chemical Services and Chemical Processing. If you are interested in finding out more about chemical tanker guideline please visit IMO official website. For any comment please Contact us
Copyright © 2011 Chemical Tanker Guide.com All rights reserved.
The extinguishing effect of dry powder originates mainly from an inhibiting effect on the combustion. The smothering and cooling effects are small.
Dry powder has a particularly good extinguishing effect on larger volumes of burning gases and strongly vapourizing liquids, as compared with other means of fire fighting. But it has virtually no cooling effect on any steel, cargo liquid or other matter that has become heated from the fire. Once the flames have been thrashed out with dry powder there is a great risk for a fire back flash which can be more violent than the original fire. At a major fire therefore, the fire area should be cooled down with water fog as much as possible prior to application of powder.
Water cooling must be continued after the flames have been extinguished If a fire can be fought immediately after its outbreak and only little heating has occurred one should of course immediately start with dry powder, not awaiting water fog assistance.
Common types of dry powder have a tendency to break down a foam layer. Therefore the two methods should be avoided being used together. Some new powders are claimed not to have this deteriorating effect on foam. Always place two dry powder extinguishers at hand on deck aft of the cargo manifold, when loading /unloading.
Summarized below are recommended fire fighting methods for modern chemical tankers:
Total flooding method for seagoing chemical tankers
Water extinguishing method for fire protection
Foam extinguishing method for chemical tankers
Dry powder fire extinguishing method
Related Info:
Controlling the atmosphere in cargo tanks with nitrogen supplied from shore
How to determine the level of a liquid in a chemical tank
Poisoning and required first aid treatment onboard
After tank cleaning gas freeing safety guideline for chemical tankers
Draegar safety tube prior entering enclosed spaces
Preparations prior allowing personnel into cargo tanks / enclosed spaces
How to rescue injured or unconscious person from enclosed spaces
Preparations for hot work and safety precautions
Tank cleaning fatality- case study & lessons learned
Tank cleaning and poisoning hazards
Testing of tanks and cargoes
Practical tank cleaning methods for various noxious liquid cargo
Special tank cleaning method
Determining proper tank cleaning by acid wash method
Supervision of all tank cleaning and gas freeing operations
Disposal of tank washings, slops and dirty ballast - safe method
Following reference publications provide useful guidance and international regulations for carrying hazardous chemicals at sea.
- SOLAS (latest consolidated edition)
- MARPOL – 73/78 (latest consolidated edition)
- BCH / IBC Code
- International Safety Guide for Oil Tankers and Terminals (ISGOTT)
- Tanker Safety Guide (Chemicals)
- Ship to Ship Transfer Guide (Petroleum)
- Safety in Oil Tankers
- Safety in Chemical Tankers
- IMDG Code
- Supplement to IMDG Code (Including MFAG and Ems)
- SOPEP
- Clean Seas Guide for Oil Tankers
- FOSFA (for Oils, Seeds and Fats)
- Prevention of Oil Spillage through Cargo Pumproom Sea Valves
- CHRIS Guide (USCG)
- Chemical Data Guide for Bulk Shipment by Water (Condensed Chris)
- MSDS for particular cargo carried
- Chemical Tank Cleaning Guide
Our detail pages contain somewhat larger lists of resources where you may find more useful information.
Main Info pages!
Home page ||| Chemical hazards ||| Cargo planning & Stowage ||| Cargo loading ||| Cargo documents ||| Safe stability ||| Cargo care ||| Preparation for unloading ||| Inert gas systems |||Gas freeing ||| Nitrogen handling ||| Chemical handling Safe practice |||Handling equipments ||| Cargo & Ballast pumps ||| Cargo tanks |||Tank cleaning |||Special cargoes |||Spills emergencies |||Fire protection
Chemicaltankerguide.com is merely an informational site about various aspects of chemical tankers and safety tips that may be particular value to those working in: Chemical Handling, Chemical Storage, Liquefied Chemical Suppliers, Chemical Shipping, Chemical Transportation, Chemical Terminals, Bulk Chemical Services and Chemical Processing. If you are interested in finding out more about chemical tanker guideline please visit IMO official website. For any comment please Contact us
Copyright © 2011 Chemical Tanker Guide.com All rights reserved.