PRESSURE CONTROL VALVE SETTING OR RELIEF VALVE SETTING
Maximum start-to-discharge pressure (psig) | Maximum permitted filling density (percent by weight) | |||
Ethylene | Ethylene | Ethylene | Hydrogen | |
17 | 6.60. | |||
45 | 52.8 | |||
75 | 51.1 | 51.1 | ||
Maximum pressure when offered for transportation | 10 psig | 20 psig | 20 psig | |
Design service temperature | Minus 260 °F | Minus 260 °F | Minus 155 °F | Minus 423 °F. |
Specification (see § 180.507(b)(3) of this subchapter) | 113D60W, 113C60W | 113C120W | 113D120W | 113A175W, 113A60W. |
Note: For DOT 113 cryogenic tank cars, delimiters indicate the following:
A-authorized for minus 423 °F loading;
C-authorized for minus 260 °F loading;
D-authorized for minus 155 °F loading.
The specification suffix "9" indicates the tank car is equipped with (minimum) 9/16 inch TC 128B normalized steel outer jacket and tank heads.
49 C.F.R. §173.319
49 U.S.C. 1803, 1804, 1808; 49 CFR 1.53 , app. A to part 1