PIPING AND INSTRUMENTATION DIAGRAMS (P&ID) - PROJECT STANDARDS AND SPECIFICATIONS

Oct 24, 2026

Engineering Standard Specification defining the required format and technical basis for Piping and Instrumentation Diagrams (P&IDs) and Utility Distribution Flow Diagrams (UDFDs) across process, offsite, and utility plants. Establishes uniform symbols for equipment, piping, and instrumentation throughout Oil, Gas, and Petrochemical (OGP) projects. Includes scope, references to recognized codes and standards, definitions, terminology, symbols and abbreviations, and unit conventions, plus guidance on minimum information and diagram preparation.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages23

Reading Time58 min

AccessFree to download

SCOPE

REFERENCES

DEFINITIONS AND TERMINOLOGY

SYMBOLS AND ABBREVIATIONS

UNITS

GENERAL

MINIMUM INFORMATION TO BE SHOWN ON P&I DIAGRAMS

DESIGN CRITERIA FOR PREPARATION OF P&I DIAGRAMS

CRITERIA FOR UTILITY FLOW DIAGRAMS

ABBREVIATIONS / GRAPHICAL SYMBOLS / IDENTIFICATIONS

PREPARATION OF P&I DIAGRAMS

APPENDIX A

| KLM Technology Group
Project Engineering Standard |
[www.klmtechgroup.com](www.klmtechgroup.com) | Page : 1 of 146 | | --- | --- | --- | | | | Rev: 01 | | | | Feb 2011 | | KLM Technology Group \#03-12 Block Aronia, Jalan Sri Perkasa 2 Taman Tampoi Utama 81200 Johor Bahru Malaysia | PIPING AND INSTRUMENTATION DIAGRAMS (P&ID)(PROJECT STANDARDS AND SPECIFICATIONS) | | KLM Technology Group has developed; 1) Process Engineering Equipment Design Guidelines, 2) Equipment Design Software, 3) Project Engineering Standards and Specifications, and 4) Unit Operations Manuals. Each has many hours of engineering development. KLM is providing the introduction to this guideline / standard for free on the internet. Please go to our website to order the complete document. [www.klmtechgroup.com](www.klmtechgroup.com) TABLE OF CONTENT SCOPE 2 REFERENCES 2 DEFINITIONS AND TERMINOLOGY 3 SYMBOLS AND ABBREVIATIONS 3 UNITS 3 GENERAL 4 MINIMUM INFORMATION TO BE SHOWN ON P&I DIAGRAMS 10 DESIGN CRITERIA FOR PREPARATION OF P&I DIAGRAMS 25 CRITERIA FOR UTILITY FLOW DIAGRAMS 35 ABBREVIATIONS / GRAPHICAL SYMBOLS / IDENTIFICATIONS 37 PREPARATION OF P&I DIAGRAMS 38 APPENDIX A 51 | KLM Technology Group
Project Engineering Standard |
[www.klmtechgroup.com](www.klmtechgroup.com) | Page : 2 of 146 | | --- | --- | --- | | | | Rev: 01 | | | | Feb 2011 | | KLM Technology Group \#03-12 Block Aronia, Jalan Sri Perkasa 2 Taman Tampoi Utama 81200 Johor Bahru Malaysia | PIPING AND INSTRUMENTATION DIAGRAMS (P&ID)(PROJECT STANDARDS AND SPECIFICATIONS) | | APPENDIX B 118 APPENDIX C 120 APPENDIX D 121 APPENDIX E 122 APPENDIX F 123 APPENDIX G 124 APPENDIX H 126 APPENDIX I 128 APPENDIX J 129 | KLM Technology Group
Project Engineering Standard | PIPING AND INSTRUMENTATION DIAGRAMS
(P&ID)
(PROJECT STANDARDS AND SPECIFICATIONS) | Page 3 of 146 | | --- | --- | --- | | | | Rev: 01 | | | | Feb 2011 | SCOPE This Engineering Standard Specification covers the format and technical basis for the Piping and Instrumentation Diagrams (P&IDs) and Utility Distribution Flow Diagrams (UDFDs) for process, offsite and utility plants. Namely, the purpose of this manual is to indicate in general terms, the extents of detailing, valving philosophy and instrumentation requirements of similar process designs. This Standard is also intended to establish uniform symbols for equipment, piping and instrumentation on P&IDs and UDFDs throughout the Oil, Gas and Petrochemical (OGP) projects. REFERENCES Throughout this Standard the following dated and undated standards/codes are referred to. These referenced documents shall, to the extent specified herein, form a part of this standard. For dated references, the edition cited applies. The applicability of changes in dated references that occur after the cited date shall be mutually agreed upon by the Company and the Vendor. For undated references, the latest edition of the referenced documents (including any supplements and amendments) applies. 1. ASME(AMERICAN SOCIETY OF MECHANICAL ENGINEERS) - B31 Series "For Pressure Piping" - B16.1 "Cast Iron Pipe Flange and Flanged Fittings , Class 25, 1st.Ed.,1989" 2. ISA (THE INTERNATIONAL SOCIETY OF AUTOMATION ) - S5.1 "Instrumentation Symbols and Identification 1st. Ed. , 1984" - S5.2 "Binary Logic Diagrams for Process Operations 2nd. Ed. , 1981 (Reaffirmed 1992)" - S5.3 "Graphic Symbols for Distributed Control / Shared Display Instrumentation, Logic and Computer Systems “Ed.,1983" - S5.4 "Instrument Loop Diagrams Ed. , 1991" - S5.5 "Graphic Symbols for Process Displays 1st. Ed. , 1985" | KLM Technology Group
Project Engineering Standard | PIPING AND INSTRUMENTATION DIAGRAMS
(P&ID)
(PROJECT STANDARDS AND SPECIFICATIONS) | Page 4 of 146 | | --- | --- | --- | | | | Rev: 01 | | | | Feb 2011 | - S18.1 "Annunciator Sequences and Specifications 1st. Ed. , 1979 (Reaffirmed 1992)" - S50.1 "

FAQs

What do the P&ID and UDFD diagrams cover under this engineering standard?

The standard defines the format and technical basis for Piping and Instrumentation Diagrams (P&IDs) and Utility Distribution Flow Diagrams (UDFDs) for process, offsite, and utility plants.

What is the purpose of the standard regarding symbols and documentation uniformity?

It establishes uniform symbols for equipment, piping, and instrumentation on P&IDs and UDFDs across Oil, Gas, and Petrochemical (OGP) projects.

Which types of referenced standards are used in the document?

It references both dated and undated standards/codes, with applicability of dated editions and the latest editions (including supplements and amendments) for undated references.

Oct 24, 2026

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