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 design. Stand-by systems are independent of the primary system in
all details, including power source and other support utilities.
Further, primary and stand-by systems are located in different
areas of the facility so that an incident which causes primary
system malfunction will not cause stand-by system malfunction. To
accomplish this fail- safe design, each of the functional systems
and subsystems (including components and operating procedures) are
analyzed in accordance with MIL-STD-882, System Safety Program
Requirements. Hyperbaric facility managers shall ensure that their
and the respective
procedures meet t h e
man-rated
systems
requirements of MIL-STD-882.
Hazard Categories.
2.6.2
All systems, equipments,
components and procedures shall be-evaluated and assigned a hazard
The HAZCAT is based upon the
category (HAZCAT) per MIL-STD-882.
potential hazard to occupants or divers and/or systems associated
with the loss of pressure boundary integrity and/or loss of
It is emphasized that the facility
functional operation.
occupants/divers are the personnel to which this HAZCAT analysis
program is directed.
In the analysis of a
Hazard Category Criteria.
2.6.3
structural (excessive leak) and/or functional failure of a system,
equipment or component the following hazard category evaluation
criteria is used (Figure 2-1 refers):
a. HAZCAT I. Occupant/Diver fatality or injury is probable.
No failure management or maintenance action planned.
Failure
Occupant/Diver injury is imminent.
b. HAZCAT II.
management and maintenance planned and required.
Occupant/Diver injury is not possible.
HAZCAT III.
c.
Failure management and maintenance planning required to continue
hyperbaric/diving operations.
Occupant/Diver injury is not possible.
d.
HAZCAT IV.
Failure management and maintenance planning not required to
continue hyperbaric/diving operations. Maintenance repairs to be
made at a convenient time.
most of the
Generally,
HAZCAT Guidelines.
2.6.4
components within a specific system are all the same HAZCAT. Since
HAZCAT I designation means a malfunction endangers the lives of
occupants/divers and no failure action is planned-- stricter
material selection and control, fabrication and installation
procedures, quality control and testing is required on HAZCAT I
items. Likewise, HAZCAT II items have more stringent requirements
than HAZCAT III and HAZCAT IV items. The following guidelines are
provided to assist in the determination of HAZCAT designations:
2-6
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