Operations
14
The requirements for Grade D breathable air include:
Oxygen ...............................................................19.5-23.5%
Hydrocarbons (condensed)
in mg/m3 .................................................... 5 mg/m3 max.
Carbon monoxide ............................................. 10 ppm max.
Carbon dioxide ............................................ 1,000 ppm max.
Odor.................................................Lack of noticeable odor
No toxic contaminants at levels that make air unsafe
to breathe.
Contact the Compressed Gas Association (1725 Jefferson Davis Hwy,
Arlington, VA 22202) for complete details on Commodity Specification G-7.1.
Air Source
Locate the source of supplied air whether it is an air compressor or
an ambient air pump, such as a Bullard Free-Air
®
pump, in a clean air
environment. Locate the air source far enough from your work site to
ensure the air remains contaminant-free. Always use an inlet filter on your
air source.
Use suitable after-cooler/dryers, filters, carbon monoxide monitors and
alarms, like the Bullard Clean Air Box (CAB) Series, as necessary to assure
clean, breathable air at all times.
The air should be regularly sampled to be sure that it meets Grade D
requirements.
Breathing Air Pressure
Air pressure must be continually monitored at the point-of-attachment
while operating this respirator. A reliable air pressure gauge must be
present to permit you to continually monitor the pressure during actual
respirator operation.
The Breathing Air Pressure Table (pages 15-17) defines the air pressure
ranges necessary to provide GenVX Series respirators with a volume of
air that falls within the required range of 6-15 cfm or 170-425 lpm (Ref. 42
CFR, Part 84, Subpart J, Table 8).
Make sure you understand the information in the Breathing Air Pressure
Table before using this respirator.
1. Find your flow control valve/climate control device in the box heading
and column 1.
2. Be sure your Bullard air supply hose(s) (column 3) is approved for use
with your flow control valve/climate control device.
3. Determine that your Bullard air supply hose is within the approved length
(column 3).
4. Make sure you have not exceeded the maximum number of hose sections
(column 3).
5. Set the air pressure at the point-of-attachment within the required
pressure range for your flow control valve/climate control device, and
air supply hose type and length. Accurate pressure readings can only be
attained when air is flowing into the respirator.
Bullard air supply hose is not included in the purchase of respirator
assembly and must be purchased separately. Bullard air supply hose
must be used in order to maintain respirator assembly compliance.
NIOSH approved Bullard air supply hose(s) MUST be used between the
breathing tube connection fitting on the wearer’s belt and the point-of-
attachment to the air supply (page 13).
NIOSH approved Bullard quick-disconnect fittings MUST be used to connect
V20 hose lengths together. When connecting lengths of V10 hose, only use
Bullard V11 hose-to-hose adapters. Secure connection(s) until wrench tight
and leak free. Total connected hose length and number of hoses MUST be
within the ranges specified on the Breathing Air Pressure Table (pages
15-17) and the respirator’s NIOSH approval label (pages 2-9).
The breathing tube connection fitting MUST be secured to the belt that is
supplied with this respirator. Securing the air entry connection fitting helps
prevent the air supply hose from snagging, disconnecting or pulling the
respirator helmet off your head.
WARNING
Failure to supply the minimum required pressure at the point-of-
attachment for your hose length and type will reduce airflow and could
result in death or serious injury.