This slide illustrate the line breaking considerations in all P&IDs for Oil & Gas, Petrochemical, refinery, power projects etc. It is very important fundamental aspect that every Process Engineer, Piping Engineer must know.

1. LINE BREAKING
PHILOSOPHY
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2. PURPOSE OF THIS SLIDE
To educate the upcoming Piping
engineers, Designers, Process
Engineers
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3. INDEX SHEET
SR.
NO.
CONTENTS NO. OF
SLIDES
1 Title slide 1
2 Purpose of the slide 1
3 Index sheets 2
4 Abbreviations 1
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4. INDEX SHEET
SR.
NO.
CONTENTS NO. OF
SLIDES
5 Where to consider the
line break?
4
6 Benefits of line breaking 2
7 Thanks Page 1
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5. ABBREVIATIONS
 PMS : PIPING MATERIAL SPECIFICATION
 P&ID : PROCESS AND INSTRUMENTATION
DIAGRAM
 BDEP : BASIC DESIGN AND ENGINEERING
PACKAGE
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6. WHERE TO CONSIDER THE LINE BREAK?
Line breaking in P&ID shall be considered as
follows:
(1) In case of pipe class change, line break shall
be considered at this breaking point. Obviously,
service & Line number shall be different from
this breaking point. Usually this break is at the
valve or Flange.
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7. WHERE TO CONSIDER THE LINE BREAK?
(2) In case of 2 different line numbers having
same pipe class and line sizes, then the break
shall usually be considered at the branch fitting
weld point.
(3) In case of 2 different line numbers with
different sizes and having same pipe class, then
the line break shall usually be considered at the
line size change.
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8. WHERE TO CONSIDER THE LINE BREAK?
Please do not confuse with number of
isometrics generation with this line breaking.
Number of isometrics generation for a single
line is a next step after considering Line
breaking as stated above.
Sample line breaking is explained in the next
slide. “Y” is indicating line break.
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9. WHERE TO CONSIDER THE LINE BREAK?
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10. BENEFITS OF LINE BREAKING
3D modelling done with proper understanding
of line breaking philosophy are having
following benefits:
 Logically & conceptually correct modelling
 Ease of understanding within the groups
 No confusions during modelling, checking
 Eliminate the chances of MTO problems
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11. BENEFITS OF LINE BREAKING
 Gives the accurate count of lines for
controlling and monitoring model progress.
 No PMS error in 3D modelling.
 Eliminates confusions during project
execution.
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