Transcript
Page 1: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 1

Gas Transmission Pipelines

ENGINEERING SERVICES LP

HOUSTON, TEXAS

Engineering Specification

Page 2: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 2

Gas Transmission Pipelines

1.0 SCOPE– Operation/Maintenance of Gas Transmission

Piping Systems» Design

» Fabrication

» Installation

» Inspection

» Testing

» Safety

Page 3: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 3

Intent

Provide engineering specifications for safe construction, opera-tion,

maintenance, and inspection of gas transmission piping systems.Shall meet or exceed ASME/ANSI

B31.8 and DOT 49CFR192.

Gas Transmission Pipelines

Page 4: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 4

Gas Transmission Pipelines

Exclusions– Design and fabrication of pressure vessels

covered by ASME BPV Code– Piping with metal temperatures above 450oF or

below -20oF– Design and manufacture of proprietary items of

equipment, apparatus, or instruments– Hazardous liquid pipelines (B31.4)

Page 5: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 5

Gas Transmission Pipelines

3.0 PIPING SYSTEMS DEFINITIONS– General Terms– Piping Systems– Pressure Relief– Valves

Page 6: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 6

Gas Transmission Pipelines

Piping Systems Component Definitions– Pipe and Piping Terms– Dimensional Terms– Mechanical Properties– Carbon Steel Pipe– Pipe Manufacturing Processes

Page 7: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 7

Gas Transmission Pipelines

4.0 Design, Fabrication, Operation, and Testing Terms

– LOCATION CLASS– Uprating– Pressure Terms– Temperature Terms– Stress Terms

Page 8: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 8

Gas Transmission Pipelines

5.0 MATERIALS AND EQUIPMENT– Qualifications of Materials and Equipment– Marking – Material Specifications - Steel Pipe– Equipment Specifications– Transportation of Line Pipe– Conditions for the Reuse of Line Pipe

Page 9: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 9

Gas Transmission Pipelines

6.0 WELDING– Welding Terms– Preparation for Welding

» Butt Welds

» Fillet Welds

» Seal Welds

Page 10: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 10

Gas Transmission Pipelines

Qualification of Procedures and Welders– Requirements for Piping Systems Operating at

Hoop Stresses Less Than 20% SMYS– Requirements for Piping Systems Operating at

Hoop Stresses More Than 20% SMYS– Variables Requiring Separate Qualification of

Welding Procedures and Welders– Welder Requalification Requirements– Qualification Records

Page 11: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 11

Gas Transmission Pipelines

Preheating and Stress Relieving– Preheating– Stress Relieving

» Maximum carbon or carbon equivalent» Thickness» Dissimilar materials» Fillet and groove weld limitations» Stress Relieving Temperatures» Methods of Stress Relieving» Equipment for Local Stress Relieving

Page 12: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 12

Gas Transmission Pipelines

Welding and Inspection Tests– Inspection of Welds on Piping Systems

Intended to Operate at Less Than 20% SMYS– Inspection and Tests for Quality Control of

Welds on Piping Systems Intended to Operate at 20% or more of SMYS

– Repair or removal of defective welds in piping intended to operate at 20% or more of SMYS

Page 13: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 13

Gas Transmission Pipelines

7.0 PIPING SYSTEM COMPONENTS AND FABRICATION DETAILS

– Valves and pressure reducing devices– Flanges– Standard fittings– Branch connections– Special connections fabricated by welding– Closures

Page 14: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 14

Gas Transmission Pipelines

Reinforcement of Welded Branch Connections– General requirements– Special requirements– Reinforcement of Multiple Openings– Extruded Outlets

Page 15: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 15

Gas Transmission Pipelines

Expansion and Flexibility– Amount of expansion– Flexibility requirements

Combined Stress Calculations Supports and Anchors for Above Ground

Piping Supports and Anchors for Buried Piping

Page 16: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 16

Gas Transmission Pipelines

8.0 DESIGN, INSTALLATION, AND TESTING

– Steel Pipe Design Formula» Limitations on Design Pressure, P

» Limitations on Specified Minimum Yield Strength

» Additional Requirements for Wall Thickness, t

» Design Factors, F, and Location Classes

» Fabricated Assemblies & Pipelines on Bridges

» Cover, Clearance, and Casing Requirements

Page 17: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 17

Gas Transmission Pipelines

Installation of Steel Pipelines– Construction Specifications– Inspection Provisions– Bends, Elbows, and Miters in Steel Pipelines– Pipe Surface Requirements for Pipe to Operate

at 20% or more of SMYS» Detection and repair of gouges, grooves, dents, and

arc burns

Page 18: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 18

Gas Transmission Pipelines

Miscellaneous Construction Operations– Handling, hauling,and stringing pipe joints– Installation of pipe in the ditch– Backfilling– Preventing combusible gas-air mixture in the

pipeline– Welding with gas in the pipeline– Purging of pipelines

Page 19: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 19

Gas Transmission Pipelines

Testing After Pipeline Construction– Two (2) hour strength test at 1.5 times design

pressure» Test pressures versus Location Classes

– Leak testing after construction– Safety During Tests

Page 20: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 20

Gas Transmission Pipelines

Compressor Station Equipment– Design– Electrical Facilities– Compressor Station Equipment– Safety Devices– Pressure Limiting Devices– Explosion Prevention

Page 21: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 21

Gas Transmission Pipelines

Compressor Station Piping– Gas Piping

» Specifications for gas piping

» Installation

» Testing

» Identification of valves and piping

» Piping design codes - Fuel gas, air, lubricating oil, water, steam, and hydraulic.

Page 22: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 22

Gas Transmission Pipelines

Control and Limiting of Gas Pressure– Requirements for Design of Pressure Relief and

Pressure Limiting Stations– Capacity of Pressure Relieving and Pressure

Limiting Stations and Devices» Required capacity

» Proof of adequate capacity and satisfactory performance of pressure limiting and pressure relief devices

– Uprating

Page 23: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 23

Gas Transmission Pipelines

8.5 Valves– Required spacing of gas transmission pipeline valves– Location of gas transmission pipeline valves

Vaults (Valve Boxes)– Structural design requirements– Accessibility– Vault Sealing, Venting, and Ventilation– Drainage and Waterproofing

Page 24: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 24

Gas Transmission Pipelines

9.0 OPERATING AND MAINTENANCE PROCEDURES

– Basic Requirements– Essential Features of the Operating and

Maintenance Plan– Essential Features of the Emergency Plan– Pipeline Failure Investigation– Prevention of Accidental Ignition– Blasting Effects

Page 25: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 25

Gas Transmission Pipelines

9.2 PIPELINE MAINTENANCE– Continuing Surveillance of Pipelines– Pipeline Patrolling– Leak Surveys– Permanent Repair Procedures for Injurious

Gouges, Grooves, Dents, Welding Defects, Leaks, and Nonleaking Corroded Areas

– Testing Repairs and Replacement Pipe Sections

Page 26: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 26

Gas Transmission Pipelines

PIPELINE MAINTENANCE (Continued)– Nondestructive Testing of Repairs, Gouges,

Grooves, Dents, and Welds– Pipeline Leak Records– Pipeline Markers– Abandoning of Transmission Facilities– Repositioning a Pipeline in Service

Page 27: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 27

Gas Transmission Pipelines

Miscellaneous Facilities Maintenance– Compressor Station Maintenance

» Inspection and testing of relief valves

» Repairs to compressor station piping

– Maintenance of Pressure Limiting and Pressure Regulating Stations

» Emergency valve inspection procedures

» Valve records

» Prevention of accidental operation

Page 28: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 28

Gas Transmission Pipelines

Pipeline Service Conversions– Historical Records Study– Requirements for Conversion to Gas Service– Conversion Procedure– Records of the Conversion

Page 29: HOUSTON, TEXAS1 Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

HOUSTON, TEXAS 29

Gas Transmission Pipelines

10.0 CORROSION CONTROL– External– Internal– Pipelines in High Temperature Service– Stress Corrosion and Other Phenomena– Records– Expanded corrosion control presentation is a

part of three (3) other training programs.


Top Related