Skip to main content

How do you Ascertain 85% of CO2 is Released within 2 mins from CO2 Fixed Fire Fighting System?

  • Dip tube inside the CO2 bottles ensures liquid getting discharged from a bottle and expands to gas outside of the bottle.
  • If dip tube is not provided, liquid from the top of the cylinder will be released and the possibility of icing in the pipes, thus rendering bottles useless.
  • Hence if the dip tube is present-assure you'he released 85% of CO2 in 2 mins.
  • The dip tube ensures no CO2 is left in the bottle just to go as waste.
CO2 fixed fire fighting system can be made so that it releases 85% of CO2 in 2 mins or even 95% in 2 mins:
  1. The discharge end nozzle has an orifice
  2. Based on the orifice diameter, which is very important and this is what decides the criteria of rate of discharge of CO2.
  3. Basically, if you increase the orifice of the nozzle even 90% of CO2 can be released in a specific time provided the bottle has a dip tube.


  1. Ultrasonically Check the weight of the bottle to ensure liquid level has dropped below, Ventilation to the CO2 bottle space is important factor ambient temp. should not be more than 55 deg c. Also, ensure there are no leakages or icing on the line.


Post a Comment

Popular posts from this blog

Difference Between A, B & C-Class Divisions?

IMO Symbol A Class Division  IMO Symbol B Class Division  SOLAS has tables for structural fire protection requirement of bulkheads and decks. The requirements depend on the spaces in question and are different for passenger ships and cargo ships. The Administration has required a test of a prototype bulkhead or deck in accordance with the Fire Test Procedures Code to ensure that it meets the above requirements for integrity and temperature rise. Types of Divisions: "A" Class "B" Class "C" Class "A" Class: "A" class divisions are those divisions formed by bulkheads and decks which comply with the following criteria: They are constructed of steel or equivalent material They are suitably stiffened They are constructed as to be capable of preventing the passage of smoke and flame to the end of the one-hour standard fire test. they are insulated with approved non-combustible materials such that the average tempera

Load Line & Why it is Important

Merchant ships have a marking on their hull know as the Plimsoll line or the Plimsoll mark, which indicates the limit until which ships can be loaded with enough cargo, internationally, the Plimsoll line on a ship is officially referred to as the international load line. Every type of ship has a different level of floating and the Plimsoll line on a ship generally varies from one vessel to another.  All vessels of 24 meters and more are required to have this Load line marking at the centre position of the length of summer load water line. There are two types of Load line markings:- Standard Load Line marking – This is applicable to all types of vessels. Timber Load Line Markings – This is applicable to vessels carrying timber cargo. These marks shall be punched on the surface of the hull making it visible even if the ship side paint fades out. The marks shall again be painted with white or yellow colour on a dark background/black on a light background.  The comp

Bilge Injection Valve

Bilge Injection is a valve that enables the engine room bilges to be pumped out directly overboard in the event of an emergency such as flooding. The valve is normally fitted to the end of a branch connection with the main sea water suction line. This enables large main seawater cooling pumps to be used as a bilge pump in an emergency. Emergencies like fire and flooding involve the use of seawater. If there is a fire, seawater is the biggest resource of water available in the sea. Similarly, if it involves flooding of the engine room, cargo spaces or any other place on the ship for that matter; you would again require pumping the sea water out of the ship. In both these cases, you require pumps.  There are two valves in close proximity namely main injection valve and bilge injection valve. Both of them have their own independent controls. The diameter of the bilge injection valve is kept nearly 66% of the main valve diameter which draws water directly from the sea through the