RBEC

Sodium bicarbonate powder is used to extinguish almost all types of fires but mostly on metal, or class D, fires. It is mainly located in the engine room and near electrical equipment.
2NaHCO3 ----> Na2CO3 + H2O + CO2
Construction: Dry powder extinguisher contains sodium bicarbonate powder in the outer container. A small container with carbon dioxide is placed beneath the plunger mechanism. Working: When the plunger is pushed, it releases the carbon dioxide gas, which in turn forces the dry powder out of the discharge nozzle.
Advantages: ABC Dry powder fire extinguishers are a multi-purpose and highly effective extinguishing agent, making them an excellent choice for use in many circumstances. As their extinguishing medium is dry they will not cause damage to items such as documentation in the way that wet types such as water or foam will.
Disadvantages:

a. Very fine powder residue that will disburse on discharge over a wide area and settle into every small place making the clean-up process of small fires more problematical.
b. The powder residue can cause damage to sensitive electronic equipment such as circuit boards, computers etc.
c. Dry powder introduces exposure hazards in three ways:
i. It causes irritation on contact with the skin.
ii. It causes irritation and discomfort on contact with eyes.
iii. It causes breathing discomfort on inhalation.
Refilling of DCP Fire Extinguishers:
Step 1: Unscrew the handle and remove the handle and main body.
Step 2: Unscrew the bottle of CO2 cartridge in the clockwise direction from the handle.
Step 3: Remove residues of DCP from the container.
Step 4: Clean the container thoroughly.
Step 5: Fill the container with fresh DCP.
Step 6: Screw the new CO2 cartridge to the handle in the anti-clockwise direction.
Step 7: Screw the handle and main body tightly.

1. The reference used to position limits of the territorial sea and the contiguous zone.
2. One side of a series of connected survey triangles, the length of which is measured with prescribed accuracy and precision, and from which the lengths of the other triangle sides are obtained by computation. Important factors in the accuracy and precision of base measurements are the use of standardized invar tapes, controlled conditions of support and tension, and corrections for temperatures, inclination, and alignment. Base lines in triangulation are classified according to the character of the work they are intended to control, and the instruments and methods used in their measurement are such that prescribed probable errors for each class are not exceeded. These probable errors, expressed in terms of the lengths, are as follows: first order, 1 part in 1,000,000; second order, 1 part in 500,000; and third order, 1 part in 250,000.
3. The line along the surface of the earth between two radio navigation stations operating in conjunction for the determination of a line of position.

A product, material, or substance falls into Division 6 of Class B if it meets either of two conditions;
1) It is spontaneously combustible under normal conditions of use and it emits a flammable gas or
2) it becomes spontaneously combustible on contact with water or water vapour.