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UNION PACIFIC RAILROAD CO. COMMON S T A N D A R D SPECIFICATION C.S. 1029 S P E C IF IC A T IO N S FO R P IP E L IN E C R O SSIN G S U N D E R R A IL W A Y TR A C K S Pipe lines included under these specifications are those installed to carry oil, gas, gasoline or other inflammable or highly volatile substance, under pressure. Gas trans­mission and distribution lines in city streets, carrying less than 45 pounds pressure, are not to be considered as coming under these specifications. 2. Installation Pipe lines under railway track and right-of-way shall be encased in a larger pipe or conduit installed as indicated in Fig. 104, below. N O T E : 1. Seal and vent pipe not required i f casing ends above ground where drainage is available. 2 . C a s i n g t o e x t e n d b e y o n d li m i t o f r a ilw a y r ig h t -o f iw a y i f n e c e s s a ry t o p ro v id e p r o p e r le n g t h o u t s id e o f t r a c k . 3. Sign to indicate location o f pipe line at right-of-way line is “optional” with Railway. Fig. 104. The casing pipe or conduit is the essential feature of the plan. Some of the other features as described in following paragraphs are optional in certain cases. A. FOR INFLAMMABLE SUBSTANCES 1. Scope ee N o te 3 ; ? / ^Screen - 45 Ft.(M i n.) —— >- See .Note 2 - . f M i 4 5 F t . fM inn. ) . ) ------------- > J £ S e e N o te 2 1 T ^ M ^ ~ C a r r[e r_ Pipe ^ Z Z 3 - 1 Seal S <^-? V e n t p ip e a t lo w en d o f c a s in g t o be c o n n e c te d t o s id e o r b o tto m o f c a s in g p i p e . V e n t p ip e a t h ig h e n d o f c a s i n g to be c o n n e c te d t o t o p o f c a s in g p i p e . See Note t Adopted— November 1949.