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MP Rd. Form 24002 ,0-74 EXHIBIT B To Form 20021 SPECIFICATIONS FOR PIPE LINES COSVEYING GAS OR COMBUSTIBLE LIQUID WHERE LOCATED ON RAILROAD PREMISES (A) SCOPE Pipe lines included under these specifications are those installed to carry oil, gas, gasoline or other combustible sub- stance, under pressure, which from its nature or,pressure might cause damage if escaping on or in vicinity of railroad proper- ty. Gas transmission and distribution lines in city streets, carrying less than 45-lb. pressure, are not to be considered as coming under these specifications. (B) PIPE LINES CROSSING ~NDER TRACKS 1. INSTALLATION: Pipe lines under railroad tracks and right-of-way shall be encased in a larger pipe or casing and installed as indi- cated in figure below: 1 Riqht of Way Line i ~ 45Ft. Minimum . :?:- See Note 2 i ~ c co tI Sign-- E e See Note3 .~ ~ t ~ 4 Ft. Minimum < Roadbed 3Ft.Minimum 5eal-A" C Vent pipe at low end Casing Vent ~ipe at hiq Seal See Note' to be connected to Carrier Pipe end 0 be connected See Note t boftom of casing to top of casing Note 1. Seal and vent pipe not required if casing ends above ground where drainage is available. 2. Casing to extend beyond limit of railroad right-of-way if necessary to provide proper length outside of track. 3. Sign indicating location of pipe line at right-of-way line to be installed where required by the Railroad. 4. For shut-off valves see Section 7. 2. CARRIER PIPE: Carrier pipe inside of casing under railroad tracks and on right-of-way shall be of good construction (usually the s8Ille as at either side 01' railroad). 01' steel, wrought iron, cast iron, pure or alloyed iron; and shaH be either seamless or substantially welded pipe with "approved" joints. Pipe ~t the railroad crossing shall be laid with slack (no tension) in the line. 3. CASING PIPE: Casing and joints in same may be 01' any conduit construction approved by the Railroad and shall be capable of with- standing load of railroad roadbed, track and traffic; it shall be so constructed as to prevent leakage of any substance from the casing throughout its length except at the ends of casing which are left open, or through the vent pipes at the ends of casing which are sealed to outside of carrier pipe. Casing shall be installed with even bearing throughout its length and shall slope to one end; it shall be so installed as to prevent formation of a waterway under the railroad. Inside diameter of casing shall be sufficiently large to permit ready withdrawal of carrier pipe without disturbing the roadbed. 4. SEALS: Where ends 01' casing are below \!;round they shall be suitably sealed to outside 01' carrier pipe and properly vented ~bove ground with vent pipes not less than 2 inches in diameter and extending not less than 4 feet above ground surface. Vent pipe at low end of casing shall be connected with bottom of casing and \'ent pipe at high end shall be connected with top of casing. Tops of vent pipes shall be fitted with down turned elbows properly screened. Where ends of casing are at or above ground surface and above high water level they may be left open, provided drain- age is afforded in such manner that leakage will be conducted away from railroad tracks or structures. Where proper drainage is not provided, ends of casing shall be sealed to outside of carrier pipe and vent pipes shall be installed. (SEE OTHER SIDE)