1. PIPELINE SPECIFICATIONS
ABC Company
ABC Chemical Complex
Engineering Specifications

2. Scope Comparison ASME/ANSI DOT 49CFR Design Materials Construction
Assembly
Inspection
Testing
Operations
Maintenance
Safety
DOT 49CFR
Prescribes minimum safety requirements for pipeline facilities
Legal document enacted by Congress

3. Format Comparison ASME/ANSI B31.4 DOT 49CFR195 Scope & Definitions
Design
Materials
Dimensional Require.
Const., Weld, & Assb.
Inspection & Testing
O&M Procedures
Corrosion Control
Appendices
DOT 49CFR195
A: General
B: Reporting Accidents
C: Design Requirement
D: Construction
E: Pressure Testing
F: O&M

4. Format Comparison: 31.8 vs 192 ASME/ANSI B31.8 DOT 49CFR192
Materials & Equipment
Welding
Pip Sys Comp & Fab
Design, Inst, and Test.
O&M Procedures
Corrosion Control
Miscellaneous
Offshore Gas Trans.
Appendices
DOT 49CFR192
General
Materials
Pipe Design
Design of Pipeline Components
Welding of Steel
General Const. Req.
Req. for Corrosion Con
Test Requirements

5. Format Comparison: 31.8 vs 192 See Previous Slide Uprating Operations
Maintenance

6. Engineering Specifications
Exceptions to Code Requirements
AS DEFINED: when Safety considerations in DOT 49CFR 192 or 195 demand tighter controls in ABC Engineering Specification than required in the governing design and construction Codes, i.e. ASME/ ANSI B31.4

7. Engineering Exceptions-Liquids
ABC Exceptions to ASME/ANSI B31.4 from DOT 49CFR195 Requirements
Subpart A
Definitions
Matter Incorporated by Reference
See “Finding Aids” in Appendix for DOT 49CFR
Compatibility necessary for transportation of hazardous liquids or carbon dioxide
Conversion to service
Responsibility of operator for compliance

8. Engineering Exceptions-Liquids
Subpart B, Reporting Accidents and Safety Related Conditions
Reporting Accidents and Safety Related Conditions
Reporting Accidents
Telephonic notice of certain accidents
Accident reports
Reporting safety-related conditions
Filing safety-related condition reports

9. Engineering Exceptions-Liquids
Subpart C, Design Requirements
Design Factor, Cold Expanded and Reheated Pipe
B31.4
75% of the allowable stress as determined by para (a), (b), or (c). [Maximum 0.72x0.75=0.54
195
0.54
, Passage of Internal Inspection Devices
Not included in ASME/ANSI B31.4

10. Engineering Exceptions-Liquids
Subpart D, Construction
, Pipeline Location
Minimum 12-inch cover within 50 feet of private dwelling or industrial building or place of public assembly.
, Nondestructive Examination
10% of all production welds for all stress levels.
100% of all girth welds when installing used pipe.
Minimum 90% in B31.4
100% for all tie in welds not hydrotested.

11. Engineering Exceptions-Liquids
Subpart D, Construction (Continued)
Cathodic Protection Systems
31.4 & 195: Install with one year of commissioning
ABC: CP system to be commissioned with pipeline.

12. Engineering Exception-Liquids
Subpart E, Pressure Testing
General Requirements
Exclude
Interstate pipeline constructed before January 8, 1971
Intrastate pipeline constructed before October 21, 1985

13. Engineering Exceptions-Liquids
Subpart F, Operations and Maintenance
, Maximum Operating Pressure
Paragraph (a)(1)(i) refers to Appendix N, “Recommended Practice for Hydrostatic Testing of Pipelines in Place”, ASME/ANSI B31.8, Gas Transmission and Distribution Piping. Appendix N is generic for all pipelines and DOT required a reference in this paragraph to establish criteria for maximum operating pressure.
80% of test pressure=0.8 x 1.25 = 1.00 = design pressure
, Pipeline Movement
Reduce pressure to 50% MAOP.

14. Engineering Exceptions-Gas
ABC Exceptions to ASME/ANSI B31.4 Due to 49CFR192 Requirements
Subpart A, General
Definitions
Administrator
Class locations
Incorporation by reference
Conversion to service subject to this part
Rules of regulatory construction

15. Engineering Exceptions-Gas
Subpart B, Materials
Transportation of pipe. (192.65)
Pipe with an outer diameter to wall thickness ratio of 70 to 1 or more may not be used in a pipeline to be operated at a hoop stress of 20% or more of SMYS if the pipe is transported by railroad.

16. Engineering Exceptions-Gas
Subpart C, Pipe Design
Class Location and Design Factor
(Same as B31.4)
(Safety Factor Increased by 20% from 1)
(Safety Factor Increased by 44% from 1)
(Safety Factor Increased by 80% from 1)
Previous editions of ASME/ANSI B31.8 used the term, “Population Density Index” with Construction Types A, B, C, and D. The Location Classes 1, 2, 3, and 4 have replaced the above in the definition of design, construction, testing, and operating require-ments.

17. Engineering Exception-Gas
Subpart D, Design of Pipeline Components
, Valves
Valves must be hydrotested at least 1.5 times the maximum service rating.
, Passage of internal inspection devices
Each new pipeline must be designed for intelligent pigging.
Operators may petition for approval to not comply.
, Components fabricated by welding
Orange-peel bull plugs and/or swages are prohibited on ABC pipelines.
Flat closures and fish tails may not be used on piping that either operates at 100 psig or above or is >3” in diameter.

18. Engineering Exceptions-Gas
Subpart E, Welding of Steel in Pipelines
Miter Joints
Miter joints are permitted in certain cases for DOT gas pipelines.
ABC specifications prohibit these joints, because restrictions are too difficult to follow and enforce in construction and maintenance welding activities.
, Nondestructive testing
B31.4 allows 40% weld inspection in Location Class 3 and 75% in Location Class 4. DOT requires 100% or at least 90% if impractical.

19. Engineering Exceptions-Gas
Subpart G, General Construction Requirements for Transmission Lines and Mains
, Wrinkle Bends in steel pipe.
Wrinkle bends are allowed on steel pipe operating at a pressure that produces a hoop stress of less than 30% SMYS.
Wrinkle bends are prohibited on ABC pipelines.

20. Engineering Exceptions-Gas
Subpart J, Test Requirements
&
For Location Class 3 which includes all ABC gas transmission pipelines, DOT requires a test pressure equal to 1.5 times the maximum operating pressure.
ASME/ANSI B31.8 requires a test pressure equal to 1.4 times the maximum operating pressure.