Chapter 2
Cylinder and Components
36
SAFETY FIRS T
Edition 1 – December 2019
MSA G1 Classic Breathing Apparatus
The following terms are used when describing the operation of buddy breathing:
Receiver
: the person who will receive the air during buddy breathing.
Provider
: the person who will provide the air during buddy breathing.
The preferred minimum for the provider of air is 150 bar. The provider
should take control of the buddy breathing procedure.
During buddy breathing, the air will be drawn down from the provider’s cylinder first,
until it reaches the receiver’s cylinder pressure. At the point where the two sets reach
the same pressure, the air will be consumed from both cylinders at an equal rate.
For example, if the provider has 200 bar, and the receiver has 50 bar, then during
buddy breathing, the two users will consume air from the provider’s 200 bar cylinder.
When the pressure on the provider’s cylinder drops below 50 bar, some air will then be
consumed from the receiver’s cylinder until a point where the two cylinders are
contributing equally to air consumption.
Although the provider and receiver’s cylinder pressures have been added
together, the time to empty will be reduced by approximately 50%. If buddy
breathing is initiated, operators
must exit immediately
. If unable to exit
immediately, call for help and remain calm.
Figure 24
– buddy breather
Male CEJN
coupling
Female CEJN
coupling
