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8/16/2019 Spending Money and Worrying for Aesthetics
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unexpected interaction of seemingly safe components or methods of operation under exceptional conditions. If it is wished to study such interactions in new designs, the combined
skill of a group of experts is required. Their total knowledge and informed imagination can beused to anticipate whether the plant will operate as intended under all possible
circumstances.
Essentially the examination procedure takes a full description of the process, systematicallyquestions every part of it to discover how deviations from the intention of the design can
occur and decides whether these deviations can give rise to hazards.
The questioning is focused in turn on every part of the design. Each part is subjected to a
number of questions formulated around a number of guide words which are derived frommethod study techniques. In effect, the guide words are used to ensure that the questions,
which are posed to test the integrity of each part of the design, will explore every conceivableway in which that design could deviate from the design intention. This usually produces a
number of theoretical deviations and each deviation is then considered to decide how it could be caused and what would be the consequences.
Deviations: These are departure from the intension which are discovered by systematically
applying the guide words.
There is need of synergic thinking from the very conceptual stage to avoid contradictions in
the installation.
ire is one of the major risks in every walk of life. !e must protect our self against ire
ha"ard by adhering to the instructions#laws while at home or otherwise.
$pending money and worrying for aesthetics could be important and understood but not at the
cost of ire safety%&revention and &rotection.
• The fundamental principle %'&rotector must be protected first( should not be
ignored.
• The cost of basic fire protection system is just less than ) % * + of the total
infrastructure cost and is worth spending.
• $pending on aesthetics is important but not at the cost of ire safety %&revention
and &rotection.
Intention: The intention defines how the part is expected to operate. This can take a number
of forms and can be either descriptive or diagrammatic. In many cases it will be a flow sheetor line diagram.
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Causes: These are the reasons why deviations might occur. nce a deviation has been shownto have a conceivable or realistic cause, it can be treated as meaningful.
Consequences: These are the results of the deviations.
Hazards: These are consequences which can cause damage, injury or loss.
Guide Words: These are simple words which are used to qualify the intention in order to
guide and stimulate the creative thinking process and so discover deviations. - list of guidewords is given in table below
Guide
Words
Meanings Comments
/ or /TThe complete negation of
these intentions
/o part of the intentions is achieved bynothing else happens
01E
2uantitative increases or decreases
These refer to quantities 3 properties such asflow rates and temperatures as well as
activities like 45E-T6 and 41E-7T68E$$
-$ !E88-$
- qualitative increase-ll the design and operating intentions are
achieved together with some additionalactivity
&-1T - qualitative decrease
nly some of the intensions are achieved9
some are not1E:E1$E
The logical opposite of the intention
This is mostly applicable to activities, for example reverse flow or chemical reaction. It
can also be applied to substances, e.g.4&I$/6 instead of 4-/TI;TE6 or 4;6
instead of 486 optical isomersT5E1
T5-/7omplete substitution
/o part of the original intention is achieved.
$omething quite different happens.
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