|
【范围】
|
1.1 This standard specifies requirements of design, construction and performance for air line breathing apparatus, including both fresh air hose apparatus and compressed air line apparatus. Laboratory and practical tests are included for the assessment of compliance of apparatus with the requirements.
1.2 This standard covers three types of apparatus:
a) Type I— Fresh air hose apparatus; without blower, short distance, in which air is drawn from a fresh air source without the assistance of a blower;
b) Type II — Fresh air hose apparatus in which air is drawn from a fresh source with hand blower and with motor-operated blower; and
c) Type III—Compressed air line apparatus in which the wearer is supplied air from a source of compressed air. This may be of constant flow type or demand valve type.
|