User:Milton Beychok/Sandbox

From Citizendium
< User:Milton Beychok
Revision as of 18:27, 7 July 2010 by imported>Milton Beychok
Jump to navigation Jump to search
Risk Ranking Matrix
   Severity    Liklihood
 Frequent   Probable  Occasional     Remote    
Major Unacceptable Unacceptable Unacceptable High
Moderate Unacceptable High High Medium
Small High Medium Low Low
Insignificant Medium Low Low low
Frequent = Once or more per year
Probable = Between once or more per year and once per 10 years
Occasional = Between once per 10 years and once per 30 years
Remote = less than once per 30 years
Definitions
Term Definition
Hazard A source, situation, event, circumstance or condition with the potential to cause harm,
including ill health, injury or death, production losses, or damage to the environment.
Study nodes
(or process sections)
Section of the process equipment with definite boundaries (for example, the piping
from a process vessel to a pump) within which process parameters are investigated
to determine the effect of deviations from the design intentionand the potential of a
hazard being created in that section.
Parameter A physical or chemical property involved in a study node, including items such as
temperature, pressure, pH, concentration, reaction or volume.
Deviation Departures from the design intention that are discovered by systematically applying
the pertinent guide words applicable for each study node.
Design intention Definition of how the study node is expected to operate in the absence of deviations from
the process design.
Guide words
(or guidewords)
Simple words used to qualify the the design intention and to guide and stimulate the
brainstorming process for identifying potential process hazards.
Safeguards
(or protection systems)
Administrative controls (such as operating manuals and work procedures) or engineered
systems designed to prevent deviations or to mitigates the consequences of deviations.
Example Matrix of Guide Words and Process Parameters
Guide word
Parameter
More Less None Reverse Part of As well as Other than
Flow x x x x x x x
Temperature x x
Pressure x x x x
Level x x x
Volume x x x x
Mixing x x x
Composition x
Reaction x x x x x



(PD) Diagram: Milton Beychok