Table of Contents
Chapter I – Introduction and Overview
Introduction............................................................................................
I-1
Overview...............................................................................................
I-2
Chapter II – Regulator and Relief Devices
Basic Concept........................................................................................
II-1
Pressure and Force.................................................................................
II-2
Flow and Throttling..................................................................................
II-3
Basic Names and Terms..........................................................................
II-7
Overpressure Protection...........................................................................
II-9
Pressure Relief........................................................................................
II-12
Monitoring..............................................................................................
II-13
Automatic Shutoff...................................................................................
II-14
Chapter III – Corrosion Control
Federal Requirements.............................................................................
III-1
Principles and Practices of Cathodic Protection.........................................
III-5
Fundamental Corrosion Theory.................................................................
III-15
Types of Cathodic Protection...................................................................
III-16
Initial Steps in Determining the Need to Cathodically Protect a
Small Gas Distribution System.................................................................
III-18
Criteria for Cathodic Protection.................................................................
III-21
Coatings.................................................................................................
III-23
Common Causes of Corrosion in Gas Piping Systems................................
III-25
Chapter IV – Leak Detection
Methods of Detecting a Leak..................................................................
IV-1
Description of Leak Detection Equipment.................................................
IV-3
Recommended Method for Surface Gas Detection Survey with
FI Unit
(Natural Gas System Only)...........................................................
IV-7
Odorization Equipment............................................................................
IV-9
Records.................................................................................................
IV-14
GPTC – Guide Material for “Leak Classification and Action Criteria”.............
IV-14
Follow-up Inspection................................................................................
IV-14
Chapter V – Unaccounted For Gas
Chapter VI – Repairs and New Construction
Planning Ahead.....................................................................................
VI-1
Excavation............................................................................................
VI-2
Emergency Excavation...........................................................................
VI-2
Precautions to Avoid Damage..................................................................
VI-2
Excavation: Repair of Damage.................................................................
VI-2
Recommendation...................................................................................
VI-3
Pipe Installation, Repair, and Replacement: General Comments.................
VI-3
Metallic Pipe Installation.........................................................................
VI-3
Plastic Pipe Installation...........................................................................
VI-4
Repair Methods – Plastic and Metal.........................................................
VI-17
Materials and Equipment Qualified for Use in Natural Gas Systems............
VI-19
Pipe......................................................................................................
VI-19
Valves...................................................................................................
VI-22
Flanges and Flange Accessories.............................................................
VI-22
Regulators and Overpressure Protection Equipment...................................
VI-23
Other Equipment....................................................................................
VI-23
Welding Requirements............................................................................
VI-24
Common Construction Practices..............................................................
VI-28
Chapter VII – Proper Location and Design of Customer Meter and Regulator
Sets
Customer Meters and Regulators: Location.................................................
VII-1
Customer Meters and Regulators: Protection From Damage.........................
VII-2
Customer Meters Installations: Operating Pressure......................................
VII-2
Service Lines: Location of Valves................................................................
VII-3
Common Problems at Service Riser and House Regulators...........................
VII-7
Chapter VIII – Plans and Reports required by the Federal Government
Plans Required by the Federal Government..............................................
VIII-1
Operations and Maintenance Plans.........................................................
VIII-1
Operations and Maintenance Plans Must Contain the
Following Components:..........................................................................
VIII-2
Emergency Plans..................................................................................
VIII-16
Reports Required by the Federal Government...........................................
VIII-26
Incident Report......................................................................................
VIII-26
Safety-Related and Condition Reports......................................................
VIII-27
Annual Reports......................................................................................
VIII-28
Appendix A – Glossary and Acronyms A-1
Appendix B – Sample Forms B-1
Appendix C – State and Federal Regulatory Agencies C-1
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