Presentation 2001/8/14
Functional Safety of Protection Devices for Electric Heaters : PART 1
Hirotaka Shimizu, Yoshinobu Sato,
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Abstract(in Japanese) (See Japanese page)
Abstract(in English) In order to specify SIL, the IEC61508 standard classifies the operation modes of SRSs into two categories, low demand mode of operation and high demand/continuous mode of operation. However, it is not clear which modes of operation should be applied to the protection devices of the heaters. Then, the present paper investigates the relationships among failures of the protection devices, demand to operate the heater and the hazardous event, i.e., breaking out of fire by use of fault tree analyses involving sequential failure logic AND-gates(priority AND-gates). Finally SILs of the protection devices are specified using the ratios of hazardous event to demand frequencies. Thus, the present paper demonstrates the procedure how to combine SILs of the protection devices with risk analyses of the overall electric heater-systems.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) safety integrity level / modes of operation / frequency of harmful event / safety-related system / functional safety / fault tree analysis / protection devices for electric heaters
Paper # SSS2001-15
Date of Issue

Conference Information
Committee SSS
Conference Date 2001/8/14(1days)
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Paper Information
Registration To Safety (SSS)
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Functional Safety of Protection Devices for Electric Heaters : PART 1
Sub Title (in English)
Keyword(1) safety integrity level
Keyword(2) modes of operation
Keyword(3) frequency of harmful event
Keyword(4) safety-related system
Keyword(5) functional safety
Keyword(6) fault tree analysis
Keyword(7) protection devices for electric heaters
1st Author's Name Hirotaka Shimizu
1st Author's Affiliation Hitachi-Kokusai Electric Inc.()
2nd Author's Name Yoshinobu Sato
2nd Author's Affiliation Tokyo University of Mercantile Marine
Date 2001/8/14
Paper # SSS2001-15
Volume (vol) vol.101
Number (no) 252
Page pp.pp.-
#Pages 6
Date of Issue