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Self contained breathing apparatus for fire protection & control system for cargo ships
Many fire fighting situations may require the use of some form of
breathing apparatus. The use of such equipment will ensure a supply of
oxygen to the wearer so that he can perform his particular tasks in safety.
Two basic types are in use—the smoke helmet and the self-contained
unit using air cylinders.
The smoke helmet arrangement uses a helmet which covers the head
and is connected to an air hose. A hand operated pump or bellows
supplies the air. A system of signals between user and supplier must be
arranged to ensure safe, correct operation.
The self-contained unit consists of one or two cylinders of compressed
air kept in a harness which is carried on the back (Figure ). The
high pressure air is fed through a reducing valve and then to a demand
valve. The demand valve is fitted into a face mask and supplies air to
meet the breathing requirements of the wearer.