{"data":{"id":"us/49-cfr-179.500-18","jurisdiction":"us","citation":"49 CFR 179.500-18","heading":"-18 Inspection and reports.","body":"(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.\n(b) Purchaser of tanks shall provide for inspection by a competent inspector as follows:\n(1) Inspector shall carefully inspect all material and reject that not complying with § 179.500-5.\n(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.\n(3) Inspector shall obtain certified chemical analysis of each heat of material.\n(4) Inspector shall make inspection of inside surface of tanks before necking-down, to insure that no seams, cracks, laminations, or other defects exist.\n(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).\n(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.\n(c) Inspector's report required herein shall be in the following form:\n(Place)\n(Date)\nSteel Tanks\nIt 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 ____________.\nBuilt for ________________________ Company\nLocation at\nBuilt by ________________________ Company\nLocation at\nConsigned to __________________ Company\nLocation at\nQuantity\nLength (inches)\nOutside diameter (inches)\nMarks stamped into tank as required in § 179.500-17 are:\nDOT-107A* * * *\nNote 1:\nThe marked test pressure substituted for the * * * * on each tank is shown on Record of General Data on Tanks attached hereto.\nSerial numbers ____ to ____ inclusive\nInspector's mark\nOwner's mark\nTest date\nWater capacity (see Record of Hydrostatic Tests).\nTare weights (yes or no) (see Record of Hydrostatic Tests).\nThese tanks were made by process of\nSteel used was identified as indicated by the attached list showing the serial number of each tank, followed by the heat number.\nSteel 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.\nBefore 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\n(D 2 + d 2)/(D 2−d 2)\nwas calculated for 7/10 the marked test pressure and recorded. Calculations were made by the formula:\nS=[0.7P(D 2−d 2)/(D 2 + d 2)]\nHydrostatic 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.\nI hereby certify that all of these tanks proved satisfactory in every way and comply with the requirements of Department of Transportation Specification No. 107A* * * *.\n(Signed)\n(Inspector)\n(Place)\n(Date)\nRecord of Chemical Analysis of Steel for Tanks\nNumbered ________ to ________ inclusive\nSize __ inches outside diameter by __ inches long\nBuilt by ________________________ Company\nFor ______________________________ Company\nHeat No. Tanks represented (serial Nos.) Chemical analysis\nC Mn P S Si Ni Cr Mo\nThese analyses were made by\n(Signed)\n(Place)\n(Date)\nRecord of Chemical Analysis of Steel in Tanks\nNumbered ________ to ________ inclusive\nSize ____ inches outside by ____ inches long\nBuilt by ________________________ Company\nFor ______________________________ Company\nHeat No. Tanks represented by test (serial Nos.) Elastic limit (psi) Tensile strength (psi) Elongation (percent in 2 inches) Reduction of area (percent)\n(Signed)\n(Place)\n(Date)\nRecord of Hydrostatic Tests on Tanks\nNumbered to inclusive\nSize inches outside by inches long\nBuilt by Company\nFor Company\nSerial 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\n1 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.\n2 Do not include protective housing, but state whether with or without valves.\n(Signed)\n(Place)\n(Date)\nRecord of General Data on Tanks\nNumbered to inclusive\nBuilt by Company\nFor Company\nData obtained as prescribed in § 179.500-4(c) Larger value of the factor D2 + d2/D2−d2 (S) Calculated fiber stress in psi at 7⁄10 marked test pressure Marked test pressure in psig stamped in tank Minimum tensile strength of material in psi recorded\nMarked end of tank Other end of tank\nSerial No. of tank (t) Min. thickness of wall in inches (d) Max. inside diameter in inches (D) Calculated value of D in inches=d + 2t (t) Minimum thickness of wall in inches (d) Maximum inside diameter in inches (D) calculated value of D in inches=d + 2t\n(Signed)","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER I—PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—HAZARDOUS MATERIALS REGULATIONS","PART 179—SPECIFICATIONS FOR TANK CARS","Subpart F—Specification for Cryogenic Liquid Tank Car Tanks and Seamless Steel Tanks (Classes DOT-113 and 107A)"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"00f9c3b3ad527ec93f367231274d39c5f7904e58d90b2426a62fb81574dbe61d","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-179.500-17","next":"us/49-cfr-appendix-a-to-part-179"},"notice":"GroundRules: Original legal text. Not legal advice."}