Reso 1996-036 to 040 - Laserfiche WebLink

Home

L SCOPE Pipelines included under these specifications are those installed to carry steam, water or any non—flammable substance which from its nature or pressure, might cause damage if escaping on or in the vicinity of railway property. 2. GENERAL REQUIREMENTS a. Pipelines under railway tracks shall be encased in a larger pipe or conduit coiled the casing pipe as indicated in Figure I. Design shall be based on superimposed load due to railway (Cooper E-80) loading with applicable impact in combination with internal pressure, external loads and installation loads. b. Casing pipe may be omitted under the following conditions providing that open trenching is approved by the Chief Engineer. (1) Under industrial tracks, and under slow speed branch line tracks in paved city streets where line pressure is less than 100 psi. The pipe joints are to be of leakproof construction and the pipe material shall safely withstand the combination of internal pressure and external loads. Joints shall be mechanical or welded type. (2) For non —pressure sewer and storm drain crossings under light traffic branch lines where the pipe strength is capable of withstanding railway loading. c. Pipelines shall be located, where practicable, to cross tracks of approximately right angles thereto but preferably at not less than 45 degrees, and shall not be Placed within culverts nor under railway bridges. Pipelines shall preferably be installed under tracks by dry boring or jacking. d. Pipelines laid longitudinally on railway rights —of —way shall be located as for as practicable from any tracks or other important structures. If located within 25 feet of the center line of any track or where there is danger of damage from leakage to any bridge, building or to structure. the carrier pipe shall be encased or of special design as approved by the Chief Engineer. 3. CARRIER PIPE a. Carrier line pipe and joints shall be of accepted material and construction as approved by the Chief Engineer. Pipe material under and adjacent to tracks are to be capable of supporting a minimum of 3600 pounds per square foot for cover heights of 30 feet or less. For heights greater than 30 feet, supporting weight shall be increased proportionately. The pipe shall be laid with sufficient slack so that it is not in tension. b. Plastic pipe in a casing is an acceptable material if it is PVC or High Density Polyethylene and minimum schedule 40. Internal pressures not to exceed 100 psi. 3. CARRIER PIPE (continued) c. Ductile Iron Pipe in o casing is acceptable as follows : Class 52 for diameters of 4' thru 10' Class 53 for diameters of 12' thru 14' Class 54 for diameters of 16' thru 18' Class 56 for diameters of 20' thru 24' d. Reinforced Concrete Pipe is acceptable if it is Class V. Minimum of Class III RCP is acceptable for longitudinal pipe located 45 feet or more from the centerline of track. e. Vitrified Clay Pipe (ASTM C-700) in a cosing is acceptable if it is extra strength with joints per ASTM C-425 and based on a load factor of 1.5. Longitudinal vitrified clay Pipe as described above is acceptable uncosed if backfill is compacted to match density of adjacent soil. 4. CASING PIPE Casing pipe and joints shall be of leakproof construction, capable of withstanding railway loading (Cooper E-80), minimum size to be determined from Table I and 2. Table 2 indicates a minimum thickness based upon superimposed loods only and it is the responsibility of the installer to provide a casing which is adequate for the loads that result during installation. If additional tracks are constructed in the future, the casing shall be extended correspondingly by the pipeline owner. Steel casing pipe to have a minimum yield strength of 35,000 psi. When casing is installed without benefit of o protective coating, and said casing is not cathodically protected, the wall thickness shown in table 2 sholl be increased to the nearest standard size which is a minimum of 0.063' greater than the thickness shown, except for diameters less than 14'. Casing distances shown in Figure I are measured perpendicular to the track. 5. CONSTRUCTION a. Casing sholl be so constructed as to prevent leakage of any substance from the casing throughout its length except at its ends. Casing shall be so installed as to prevent the formation of a waterway under the railway. with an even bearing through its length, and shall slope to one end (except for longitudinal occupancy). b. Installation by open trench methods shall comply with Installation of Pipe Culverts. American Railway Engineering Association (AREA) Manual for Railway Engineering. Chapter I, Port 4.12 . c. Dry bored or jacked installations shall have a bored hole diameter essentially the some as the outside diameter of the pipe plus the thickness of the protective coating. If voids should develop or if the bored diameter is greater than the outside diameter of the pipe (including cooling) by more than one inch, the space shall be filled by grouting or other remedial measures as approved by the Chief Engineer. Boring operations shall not be stopped if such stoppage would be detrimental to the railroad. 5. CONSTRUCTION (continued) d. Tunneling operations shall be conducted as approved by the Chief Engineer. If voids are caused by the tunneling operations, they shall be filled by pressure grouting or by other approved methods which will provide proper support. e. Void between casing and carrier pipe to be filled with sand in all high pressure installations. Void to be partially filled in others as directed by the Chief Engineer. f. Excavations and bore pits sholl be a minimum distance of twenty feet from the centerline of the nearest track. Shoring plans and calculations may be required to be submitted prior to construction per AREA manual and SP supplement. g. Fibre Optic cable lines may be on the right—of—way, the applicant shall call (800)283-4237 to determine if fiber optic cables are present. Applicant shall call prior to digging to verify location and arrange inspection. 6. PROTECTION AT END OF CASING The ends of the cosing are to be suitably sealed against the entrance of foreign material, but are not to be tightly sealed. SOUTHERN PACIFIC LINES COMMON STANDARD PIPE LINES FOR NON-FLAMMABLE SUBSTANCES ACROSS OR ALONG RIGHT OF WAY EN. C. S TANDAR D. CS 1741. REV IS ED NO SCALE ADOPTED APR. 20. 1953 REVISED JAN. 1. 1990