U.S. Code of Federal Regulations
Regulations most recently checked for updates: Jul 09, 2020
(a) Before a tank car is placed in service, the party assembling the completed car shall furnish to car owner, Bureau of Explosives, and the Secretary, Mechanical Division, Association of American Railroads, a report in proper form certifying that tanks and their equipment comply with all the requirements of this specification and including information as to serial numbers, dates of tests, and ownership marks on tanks mounted on car structure.
(b) Purchaser of tanks shall provide for inspection by a competent inspector as follows:
(1) Inspector shall carefully inspect all material and reject that not complying with § 179.500-5.
(2) Inspector shall stamp his official mark on each forging or seamless tube accepted by him for use in making tanks, and shall verify proper application of heat number to such material by occasional inspections at steel manufacturer's plant.
(3) Inspector shall obtain certified chemical analysis of each heat of material.
(4) Inspector shall make inspection of inside surface of tanks before necking-down, to insure that no seams, cracks, laminations, or other defects exist.
(5) Inspector shall fully verify compliance with specification, verify heat treatment of tank as proper; obtain samples for all tests and check chemical analyses; witness all tests; and report minimum thickness of tank wall, maximum inside diameter, and calculated value of D, for each end of each tank as prescribed in § 179.500-4(c).
(6) Inspector shall stamp his official mark on each accepted tank immediately below serial number, and make certified report (see paragraph (c) of this section) to builder, to company or person for whose use tanks are being made, to builder of car structure on which tanks are to be mounted, to the Bureau of Explosives, and to the Secretary, Mechanical Division, Association of American Railroads.
(c) Inspector's report required herein shall be in the following form:
It is hereby certified that drawings were submitted for these tanks under AAR Application for Approval ______ and approved by the AAR Committee on Tank Cars under date of ______.
The marked test pressure substituted for the * * * * on each tank is shown on Record of General Data on Tanks attached hereto.
Steel used was identified as indicated by the attached list showing the serial number of each tank, followed by the heat number.
Steel used was verified as to chemical analysis and record thereof is attached hereto. Heat numbers were stamped into metal. All material was inspected and each tank was inspected both before and after closing in ends; all material accepted was found free from seams, cracks, laminations, and other defects which might prove injurious to strength of tank. Processes of manufacture and heat-treatment of tanks were witnessed and found to be efficient and satisfactory.
Before necking-down ends, each tank was measured at each location prescribed in § 179.500-4(c) and minimum wall thickness in inches at each location was recorded; maximum inside diameter in inches at each location was recorded; value of D in inches at each location was calculated and recorded; maximum fiber stress in wall at location showing larger value for
Hydrostatic tests, tensile test of material, and other tests as prescribed in this specification, were made in the presence of the inspector, and all material and tanks accepted were found to be in compliance with the requirements of this specification. Records thereof are attached hereto.
I hereby certify that all of these tanks proved satisfactory in every way and comply with the requirements of Department of Transportation Specification No. 107A* * * *.
|Heat No.||Tanks represented (serial Nos.)||Chemical analysis|
|Heat No.||Tanks represented by test (serial Nos.)||Elastic limit (psi)||Tensile strength (psi)||Elongation (percent in 2 inches)||Reduction of area (percent)|
Record of Hydrostatic Tests on Tanks
|Size||inches outside by||inches long|
|Serial Nos. of tanks||Actual test pressure (psig)||Total expansion (cubic cm)||Permanent expansion (cubic cm)||Percent ratio of permanent expansion to total expansion 1||Tare weight (pounds) 2||Capacity in pounds of water at 60 °F|
1 If tests are made by method involving measurement of amount of liquid forced into tank by test pressure, then the basic data on which calculations are made, such as pump factors, temperature of liquid, coefficient of compressibility of liquid, etc., must also be given.
2 Do not include protective housing, but state whether with or without valves.
Record of General Data on Tanks
|Data obtained as prescribed in § 179.500-4(c)||Larger value of the factor ||(S) Calculated fiber stress in psi at
||Marked test pressure in psig stamped in tank||Minimum tensile strength of material in psi recorded|
|Marked end of tank||Other end of tank|
|Serial No. of tank||(t) Min. thickness of wall in inches||(d) Max. inside diameter in inches||(D) Calculated value of ||(t) Minimum thickness of wall in inches||(d) Maximum inside diameter in inches||(|