(1) TB 1 - 1 Inch Hose In Structural Fire Fighting

Question 1

The “indirect method” of applying water on a fire may be defined as: “the cooling of the area directly above the fire, in a confined space, using a ______ or _______ stream.”

Answer 1

fine spray or fog stream

Question 2

Two conditions are necessary if the indirect method of applying water is to be successful:

Answer 2

• A fire area which has not vented vertically, and preferably not at all.
• A hot fire with an accumulation of heat.

(When the above conditions are present in a relatively small and confined area, a quick knock down may be effected with little water damage, less fire damage, and less punishment to the men than if the conventional method is used.)

Question 3

The indirect method of applying water requires the deviation from two basic principles of fire fighting:

Answer 3

• Water is NOT applied at the seat of the fire; but above the fire through the hot gases and near the ceiling.
• All vertical ventilation is delayed until the fire is knocked down

Question 4

The indirect application of water with a 1 inch hose line is practical at 125 psi engine pressure, but the efficiency is increased with ______ pressures.

Answer 4

Higher

Question 5

The use of the indirect method of applying water does not affect the choice of size of hose to use.

Regardless of the method used, conventional or indirect, a 1 inch line should be used ONLY when the _____ of the fire warrants. Even then small lines should be backed up by larger lines as required.

Answer 5

-size

(It is important to emphasize that the information in this bulletin is not to be interpreted as procedures to replace standard methods of fire fighting. It is merely information to aid you in becoming more familiar with the use of 1 inch lines on interior fire fighting.)