STEEL PIPELINES CROSSING RAILROADS AND HIGHWAYS
American Petroleum Institute
1 Scope
1.1 General
1.2 Application
1.3 Type of Pipeline
1.4 Provisions for Public Safety
1.5 Approval for Crossings
2 Symbols, Equations, and Definitions
2.1 Symbols
2.2 Equations
2.3 Definitions
3 Provisions for Safety
4 Uncased Crossings
4.1 Type of Crossing
4.2 General
4.3 Location and Alignment
4.4 Cover
4.5 Design
4.6 Loads
4.7 Stresses
4.8 Limits of Calculated Stresses
4.9 Orientation of Longitudinal Welds at Railroad and Highway
Crossings
4.10 Location of Girth Welds at Railroad Crossings
5 Cased Crossings
5.1 Carrier Pipe Installed within a Casing
5.2 Casings for Crossings
5.3 Minimum Internal Diameter of Casing
5.4 Wall Thickness
5.5 General
5.6 Location and Alignment
5.7 Cover
5.8 Installation
5.9 Casing Seals
5.10 Casing Vents
5.11 Insulators
5.12 Inspection and Testing
6 Installation
6.1 Trenchless Installation
6.2 Open Cut or Trenched Installation
6.3 General
7 Railroads and Highways Crossing Existing Pipelines
7.1 Adjustment of Pipelines at Crossings
7.2 Adjustment of In-service Pipelines
7.3 Adjustments of Pipelines Requiring Interruption of Service
7.4 Protection of Pipelines During Highway or Railroad
Construction
Annex A - Supplemental Material Properties and Uncased Crossing
Design Values
Annex B - Uncased Design Example Problems
Annex C - Casing Wall Thicknesses
Annex D - Unit Conversions
References
Describes the design, installation, inspection, and testing required to ensure safe crossings of steel pipelines under railroads and highways.
| Document Type | Standard |
| Status | Current |
| Publisher | American Petroleum Institute |
| ProductNote | Reconfirmed 2015 |
