Logic Solvers for Overpressure Protection
ثبت نشده
چکیده
Introduction A growing level of attention has recently been given to the automated control of potentially hazardous processes such as the overpressure or containment of dangerous substances. Several independent protection methods provide measures to reduce the risk from such hazards to personnel, the environment and assets. A significant level of this risk reduction is allocated to safety instrumented functions (SIF). The integrity of the safety instrumented system (SIS) to perform these functions (known as functional safety) is therefore critical and the requirements for determining and achieving functional safety are given in IEC 61511-1[REF 1]. This standard is now adopted as the predominant worldwide standard for such systems in the process industry.
منابع مشابه
Logic Solver for Tank Overfill Protection
Introduction A growing level of attention has recently been given to the automated control of potentially hazardous processes such as the overpressure or containment of dangerous substances. Several independent protection methods provide measures to reduce the risk from such hazards to personnel, the environment and assets. A significant level of this risk reduction is allocated to safety instr...
متن کاملExplosion caused by flashing liquid in a process vessel.
An explosion occurred at a polyvinyl chloride (PVC) resin manufacturing plant. The explosion originated at an atmospheric storage vessel when it received a slurry discharge from a suspension polymerization reactor. The pressure rise caused by the uncontrolled flashing of superheated liquid vinyl chloride resulted in the complete separation of the roof from the tank shell. A cloud of vinyl chlor...
متن کاملThe Importance of a Robust Assessment Procedure in Protecting against Rapid Overpressure Hazards
The identification of a suitable basis of safety to protect, or prevent, against overpressure hazards from gas, vapour or dust explosions and runaway chemical reactions or decompositions is a prerequisite for safe operation. However, the process of successfully realising and implementing the basis of safety is critical to its success. This paper examines the critical phases of selection of the ...
متن کاملA Proposal for the Cooperation of Solvers in Constraint Functional Logic Programming
This paper presents a proposal for the cooperation of solvers in constraint functional logic programming, a quite expressive programming paradigm which combines functional, logic and constraint programming using constraint lazy narrowing as goal solving mechanism. Cooperation of solvers for different constraint domains can improve the efficiency of implementations since solvers can take advanta...
متن کاملApplication of simulated annealing for optimization of blasting costs due to air overpressure constraints in open-pit mines
Estimating the costs of blasting operations is an important parameter in open-pit mining. Blasting and rock fragmentation depend on two groups of variables. The first group consists of mass properties, which are uncontrollable, and the second one is the drill-and-blast design parameters, which can be controlled and optimized. The design parameters include burden, spacing, hole length, hole diam...
متن کامل