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Best Practices in SISDocumentation

Ed Marszal, President, Kenexis

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Presenters

Ed Marszal

Gary Hawkins

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Introduction

Safety Instrumented System Design per IS S!"#$ is%e&'ming a &'mm'n pra&ti&e

P''r d'&umentati'n is %eing generated due t'

safety &ase# mentality

(urrent pra&ti&es ign're audien&e 'f d'&uments andg''d pra&ti&es# f'r spe&ifi&ati'ns in general

$ )SI *IS !"++-./" 0IE( 1-2--.M'd3

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FEED Phase SIS Documents

4ist 'f Safety Instrumented 5un&ti'ns 0SI53

Gr'uping 'f Instrumented Pr'te&ti6e 5un&ti'ns 0IP53

7 Gr'up %y e8uipment 'r pr'&ess

9 ('mpress'rs

9 :ea&t'rs

9 5ired Heaters

P;ID representati'n 'f SI5

4'gi& des&ripti'n

7 &ause and effe&t ta%les

7

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Preliminary Design Steps

SI5 4ist s='uld %e pre&urs'r t' SI4 sele&ti'n H?@P*4@P wit='ut kn'wledge 'f typi&al SI5 leads

t' err'rs

H?@P is a final &=e&k 'n a g''d design, n't a

design task >ypi&al SI5 %ased 'n experien&e, standards, &'des,

and Audgment

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Instrumented Protective Function Groups

Gr'up instruments t'get=er t=at are fun&ti'nallyrelated

>ypi&ally %ased ar'und maA'r e8uipment

7 ('mpress'rs

7 5ired Heaters

7 :ea&t'rs

>ypi&ally &'ntains multiple SI5

ls' &an &'ntain n'n.SI5 instruments and l'gi&

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Typical Plant Groupings

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IPF Grouping for Separator

B.--

P>

--

--

4>

--

--

CS(--

CS(--

4G

--

4G

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Emers'n SIS 4ife&y&le 'rk%''k

7 t Delta B SIS