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EMP shielding properties of conduit systems and related hardware. Final report

Technical Report ·
OSTI ID:7148122
; ;
This report presents the results obtained by CERL over the past 3 years under its investigation of the shielding properties on conduit systems, conduit-related hardware, and the effects of improper field assembly on the shielding of conduit systems. The measurements were made by injecting EMP-type current pulses onto test conduits and measuring the signal picked up on a sense wire inside the conduit. Results are presented for the measurement of both diffusion and leakage signals. The diffusion signal provides a base line for the conduit shielding since it is the optimum shielding obtainable for a given size and material of conduit. The leakage signals represent a degradation of the conduit shielding due to the insertion of conduit hardware required to assemble the conduit runs, or to the improper assembly of the conduit system. Included in the leakage study were various hardware items including couplings, unions, conduits of various sizes, flexible conduit, condulets, lock nuts, threaded hubs, and a variety of condulet gaskets. In addition, the effects of thread corrosion, use of different conductive compounds, various methods of compound application, welding near couplings, and the inadequate tightening of threaded joints were evaluated. The greatest single factor in the degradation of the shielding effectiveness of conduit assemblies was the inadequate tightening of conduit joints. (GRA)
Research Organization:
Army Construction Engineering Research Lab., Champaign, Ill. (USA)
OSTI ID:
7148122
Report Number(s):
AD-A-012729; CERL-TR-C-19
Country of Publication:
United States
Language:
English

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Related Subjects

440200* -- Radiation Effects on Instrument Components
Instruments
or Electronic Systems
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CABLES
CONDUCTOR DEVICES
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC PULSES
ELECTROMAGNETIC RADIATION
EQUIPMENT
HARDENING
PERFORMANCE TESTING
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATION HARDENING
RADIATIONS
SHIELDING
TESTING