DEFINITION : hoses are flexible pipe used to convey water from the source to the scene of fire.
TYPES OF HOSE : 1) DELIVERY HOSE 2) SUCTION HOSE 3) HOSE REEL HOSE
1) Delivery Hose :
This is connected to the discharge side of the pump. This is subjected to a pressure greater than the atmospheric pressure. These are available in the Fallowing type:
(i) Percolating / Unlined / Canvas hose which are made of vegetable fibers.
(ii) Non percolating hose made up of plastic material forming both lining as well as the outer cover. These are no porous in nature.
(iii) Controlled percolating hose consisting of a jacket woven from vegetable fibers and having rubber / plastic lining.
2) Suction Hose :
These are connected to the suction side of the pump. These are subjected to either above or below the atmospheric pressure. These are of following
(i) Partially embedded
(ii) Smooth Bore fully embedded.
3) Hose Reel Hose: These are made of reinforced rubber fitted with a swiveling joint bound over a reel. A squeeze nozzle is provided at one end.
TAKE A LOOK HOW ITS MADE
CHARACTERISTICS , REPAIR AND HANDLING
CHARACTERISTICS OF HOSE:
The main characteristics essential for a good fire fighting hose are:
Hose must be sufficiently flexible to
Enable it to be handled with ease.
Enable it to be made up into a smooth and tight role. The crease at the edges should be uniform and regular so that the hose does not bulge on one side after wobbling repeatedly.
Hose must be a strong enough for it to be reliable during the use.
The materials used in its construction must have high resistance to abrasion and should be able to withstand the rough usage.
A tough plastic outer cover will provide additional protection to the jacket and prolong its life.
(iii) Resistance to rot:
Hoses made of natural fibres are prone to be affected by rot or fungi. These must be treated with rot proofing agents such as zinc chloride, penta chloro phenyl laurate, 1.5% by mass or penta chloro phenyl 1- hydroxyl isopropyl, etha (Max 2% by mass)
CARE AND MAINTENANCE OF HOSE
(i) Store in a cool dry and well ventilated place.
(ii) Hoses should be cleaned & dried periodically
(iii) Rubber lined hoses should be cleaned by passing water through them and dried
on towers, periodically. These should not be exposed to hot dry air or sun rays
for long periods.
(iv) Hoses should be stored in long folds or in figure eight position.
(v) The folds should be changed periodically.
(vi) Hoses contaminated with acids / alkalies or oils should be cleaned and dried before Storing.
(vii) Hoses should be drained by under running and not be walking over them.
(i) Normally the cleaning is done with water alone.
(ii) If the hose is contaminated with grease / oil add a little soda in water and clean.
(iii) If the hose is contaminated with thick grease / acid / oil, use saw dust and fine
sand to rub off the sticky substances.
Natural: In sheds constructed in such a way as to permit the entry of air as much as possible. But no rain should enter it. The hoses are hung from towers / or hooks at the roof of the shed with the help of pulleys.
Mechanical: In chambers of brick construction. Provision is made to accommodate 20 lengths of hoses. All the hoses are coupled to manifold through which warm air is blown.
An exhaust fan is fitted to the chamber so that constant air is circulated.
After use the hose should be inspected carefully to detect any damage and to repair the same for future use. Every damage such as pin holes should be marked and the defective hoses should be rolled with male coupling inside for the sake of identification.
Generally the following repairs are carried out.
Hose coverings & Bandages: Leather gaiters and canvas bandages are applied
where the hose appears to be weakened.
Darning : Pin holes are generally repaired by darning some strands of flex. A
patch should be placed on the same.
Patching : Leaks in the hose are satisfactorily repaired by patching.