Implementing programmable safety shutdown systems
- Planned Control Pty., Ltd., Boneli Beach (AU)
Traditionally, nonprogrammable hardware comprising relays, timers and signal conditioning modules have been used in safety shutdown systems. However, microprocessor technology in the form of off the shelf programmable logic controllers (PLCs) and distributed control systems (DCSs) are being used. Industry is attracted to the benefits of programmable trip systems, but is concerned about the traditional problems of: unpredictable and complex failure modes, widespread effects of failures, and spurious trips. This article discusses guidelines assembled recently by UK, German and U.S. authorities to assist industry in designing such systems. It summarizes characteristics of nonprogrammable vs. programmable trip systems in performance, operation and implementation. These generally reflect the advantage of computerized over fixed-function devices.
- OSTI ID:
- 6468847
- Journal Information:
- Hydrocarbon Processing; (USA), Journal Name: Hydrocarbon Processing; (USA) Vol. 69:10; ISSN HYPRA; ISSN 0018-8190
- Country of Publication:
- United States
- Language:
- English
Similar Records
Using PLCs in safety applications
Failure and Reliability Analysis for the Master Pump Shutdown System
Related Subjects
020600 -- Petroleum-- Health & Safety
020700* -- Petroleum-- Economics
Industrial
& Business Aspects
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
COMPUTERIZED CONTROL SYSTEMS
COMPUTERS
CONTROL SYSTEMS
DATA PROCESSING
DESIGN
DISTRIBUTED DATA PROCESSING
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
EQUIPMENT
FAILURE MODE ANALYSIS
INDUSTRY
LOGIC CIRCUITS
MICROELECTRONIC CIRCUITS
MICROPROCESSORS
PETROLEUM INDUSTRY
PROCESSING
RELAYS
SAFETY
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS