UFC 4-390-01
23 July 2003
be stored in a way that prevents their contamination.
B.9
DESIGN OF ELECTRICAL SYSTEMS
Consideration must be given to the electrical requirements for
all unmanned pressure test facilities and supporting equipment.
This covers a wide range of equipment from heavy machinery such
as pumps, compressors and handling equipment to precise
instrumentation for monitoring, control, communications and data
acquisition.
Although they cannot always be eliminated, electrical components
exposed to high oxygen concentrations inside an unmanned pressure
test facility pressure hull are potentially hazardous. The
applicant should justify their use and should show their
potential for creating a fire hazard in a hazard analysis.
Electrical systems must be designed to the requirements of
NFPA-70.
B.9.1 Power Requirements. The applicant should provide an
estimate of he power requirements, both normal and emergency, to
support the unmanned pressure test facility. The applicant
should show how much power is required from the support facility
and how much of the unmanned pressure test facility is self-
supporting.
B.9.2 Electrical Connectors and Penetrators. The bodies of
pressure vessel electrical penetrators and connectors exposed to
water should be made of corrosion resistant material. Connector
pins and sockets should be corrosion resistant or plated to
prevent corrosion and electrical discontinuities. Provisions
should be made to protect the pressure vessel from corrosion in
the gasketed areas of the penetrators. Electrical connectors and
individual hull penetrator designs should be technically
justified for their intended applications.
B.9.3 Electrical Connectors. Connector design should permit the
operator to readily disconnect the cable assembly and any other
electrical conductor without receiving an electrical shock.
System design or operating procedures should not allow
disconnecting connectors when the circuit is energized.
Electrical connectors must be designed to prevent incorrect
connection and accidental disconnection. This may be
accomplished by size selection, key fitting, or other means.
Color-coding or other visual identification alone is usually
insufficient.
B.9.4 Electrical Penetrators. Pin-type connections for cable
entrances into compensated enclosures are preferred; however,
terminal tube entrances are acceptable provided evidence of
compatibility of the cable jacket and insulation with the
compensating medium is provided.
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