The compressed air bottles are intended to air preservation under 3,2 MPa pressure.
Depending on their construction, they are divided in the following two types:
- compressed air bottles with a head and fittings arranged on it, with volume up to 0,8 m3;
- compressed air bottles without a head with fittings arranged on the body, with volume over 0,8 m3;
Each compressed air bottle can be completed with a spring or fusible safety valve.
There are versions for bottles with volume over 1,0 m3 depending on the bottle fittings.
The compressed air bottles with a volume up to 0,4 m3 inclusive are for vertical or horizontal mounting, and these with volume over 0,5 m3 inclusive, are only for horizontal mounting and with bottom manhole.