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Details :
Principles of Operation :
Operation of the Combination
Pressure-Demand Breathing Apparatus is manual. It is an
approved, rated five-minute escape device. The pressure demand
air-line respirator phase is connected by an approved air-supply
hose to a primary respirable air source; the worker breathes
from this source with the valve of the egress (exit) cylinder of
the device turned off until the user is ready to leave the
working area. The user can leave, connected to the primary air
source, or can open the egress cylinder valve and have
approximately five minutes'; respiratory protection. When
breathing from the air cylinder, the user can remain connected
to the primary air supply and exit, or can disconnect from the
air source for easier escape. If the primary air supply source
should fail for any reason, the worker can switch to the egress
cylinder by turning a valve and escape to a safe atmosphere.
Approvals & Standards :
The Combination Pressure-Demand
Breathing Apparatus is approved by the National Institute for
Occupational Safety and Health (NIOSH) Approval TC-13F-143-when
the device is supplied with respirable air from either the small
escape cylinder or from a primary compressed-air source; the
approval requires that when connected to a primary air source,
an air inlet pressure between 65 and 85 psig must be maintained
through an approved hose length of between 8 and 300 feet. The
approval requires that the compressed-air cylinder be fully
charged with air conforming to at least Grade D of Compressed
Gas Association Commodity Specification for Air, G-7-1; use
limited to temperatures above -25 degrees F.
Applications :
Asbestos Abatement
Chemical
Construction
Hazardous Materials
Nuclear
Oil and Gas
Welding
Hazards :
Confined Space
Oxygen Deficiency
Toxic Atmosphere IDLH
Welding
Product Information :
Provides respiratory protection for
personnel who must work in atmospheres that are immediately
dangerous to life and health (IDLH), such as in oil drilling and
the manufacturing and handling of certain chemicals. Serves as
both a long-duration work device and an escape device. Approved
for respiratory protection for entry into, for extended periods
of work in and for escape from IDLH atmospheres. If used for
entry into IDLH atmospheres, the air-line must be connected
before entry. The self-contained air supply is approved for
escape only. The apparatus features a lightweight shoulder
harness, which is foam-padded for extra comfort and a waist belt
with a seat-belt-type buckle. The handwheel of the cylinder
valve is easy to grasp and operate. A short length of neoprene
hose makes it easy to connect and disconnect the air-supply
hose. The inlet is equipped with a Snap-Tite, Foster, Hansen or
Duff-Norton quick-disconnect fitting
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