1 If the tests are made by a method involving the measurement of the amount of liquid forced into the tank by the test pressure, then the basic data, on which the calculations are made, such as the pump factors, temperature of liquid, coefficient of compressibility of liquid, etc., must also be given. ? Do not include protective housing and cover but state whether with or without valves. Page 878 (c) Before a tank car is placed in service, the party assembling the completed car must furnish to the car owner, Bureau of Explosives, and the secretary, mechanical division, American Railway Association, a report in proper form certifying that the tanks and their equipment comply with all of the requirements of this specification, and including information as to serial numbers, dates of tests, and ownership marks on the tanks mounted on the car structure.* [Par. 15] 2] SHIPPING CONTAINER SPECIFICATION 106A800 WELDED STEEL TANKS TO BE MOUNTED ON OR TO FORM PART OF A CAR 72.106A800-1 Type. Same as specification 106A500.** [Par. 1] 72.106A800-2 Material. Same as specification 106A500.** [Par. 72.106A800-3 Thickness of plates. Same as specification 106A500.** [Par. 3] 72.106A800-4 Tank heads. Same as specification 106A500.*† [Par. 4] 72.106A800-5 Welding and heat treatment. Same as specification 106A500.*+ [Par. 5] 72.106A800-6 Anchorage. Same as specification 106A500.*+ [Par. 6] 72.106A800-7 Protective housing and cover. Same as specification 106A500.** [Par. 7] 72.106A800-8 Venting, loading, and discharge valves. Same as specification 106A500, except that these valves must withstand a pressure of 800 pounds per square inch without leakage.* [Par. 8] 72.106A800-9 Safety valves and vents. (a) Same as specification 106A500. (b) Same as specification 106A500. (c) Safety valves must be set to open and vents of the frangibledisk type must function at a pressure of not exceeding 600 pounds per square inch. Vents of the fusible-plug type must function at a temperature of not exceeding 175° F. (For tolerance, see § 72.106A800-12.)*+ [Par. 9] 72.106A800-10 Fixtures. Same as specification 106A500.*† [Par. 10] 72.106A800-11 Tests of tanks. (a) Same as specification 106A,500. (b) Each tank must be tested to 800 pounds per square inch. (c) Same as specification 106A500. (d) Same as specification 106A500. (e) Same as specification 106A500.*+ [Par. 11] 72.106A800-12 Tests of safety valves and vents. (a) Each valve must be tested by air or gas before being put into service and also at **For statutory and source citations, see note to § 72.1A-1. Page 879 intervals as prescribed in § 72.106A800-13. The valve must open at a pressure of not exceeding 600 pounds per square inch and be vapor tight at 480 pounds per square inch, which limiting pressures must not be affected by any auxiliary closure or other combination. (b) For safety vents of the frangible-disk type, a sample of the disks used must burst at a pressure of not exceeding 600 pounds per square inch and be vapor tight at 480 pounds per square inch. (c) For safety vents of the fusible-plug type, a sample of the fusible plugs used must function at a temperature of not exceeding 175° F. and be vapor tight at a temperature of 130° F.*+ [Par. 12] 72.106A800-13 Retests, alterations, and upkeep of tanks, safety valves, and vents. Same as specification 106A500.*+ [Par. 13] 72.106A800-14 Marking. Same as specification 106A500. (a) ICC-106A800. (b) Same as specification 106A500. (e) Same as specification 106A500. (f) Same as specification 106A500.*t [Par. 14] 72.106A800-15 Inspection and reports. Same as specification 106A500.** [Par. 15] SHIPPING CONTAINER SPECIFICATION 107A SEAMLESS STEEL TANKS TO BE MOUNTED ON OR TO FORM PART OF A CAR 72.107A-1 Type and general requirements. (a) Tanks built under this specification must be hollow forged or drawn in one piece. Forged tanks must be machined inside and outside before ends are necked down and, after necking down, the ends must be machined to size on the ends and outside diameter. Ends of tanks must be closed with forged steel covers securely attached by bolts or studs. All openings must be located in covers. The full complement of tanks must be securely attached to car structure. (b) Manufacture of tanks must be completed with approved appliances and according to approved modern methods. (c) For tanks made in foreign countries, chemical analysis of material and all tests as specified must be carried out within the limits of the United States under supervision of a competent and disinterested inspector; in addition to which, provisions of § 72.107A-15 (a), (b) of this specification must be carried out at the point of manufacture by a recognized inspection bureau with principal office in the United States." [Par. 1, as amended Jan. 13, 1932] 72.107A-2 Material. (a) Tanks must be made from open-hearth or electric steel of uniform quality. Material must be free from seams, cracks, laminations, or other defects injurious to finished tank. Forgings and seamless tubing for bodies of tanks must be marked with heat numbers. [As amended Jan. 13, 1932] Page 880 **For statutory and source citations, see note to § 72.1A-1. (b) Steel must conform to the following requirements as to chemical composition: Use of other alloying elements is not prohibited. For instructions as to the obtaining and checking of chemical analysis, see § 72.107A-15 (a) (3). [As amended Apr. 18, 1932] (c) Each necked-down tank must be uniformly and properly heat treated. Heat treatment must consist of annealing or normalizing and drawing. Heat treatment involving the use of liquid-quenching medium is prohibited, except under special approval. All scale must be removed from inside and outside of tank to an extent sufficient to allow proper inspection. [As amended Apr. 18, 1932] (d) Physical tests must be made on two test specimens taken 180° apart, one from each ring section cut from each end of each forged or drawn tube before necking down, or one from each prolongation at each end of each necked-down tank. These test specimen ring sections or prolongations must be heat treated with the necked-down tank which they represent. The width of the test specimen ring section must be at least its wall thickness. Only when diameters and wall thickness will not permit removal of 0.505 by 2-inch tensile test bar, laid in the transverse direction, may test bar cut in the longitudinal direction be substituted. [As amended Apr. 18, 1932] (e) Elastic limit, as determined by extensometer, must not exceed 70 percent of tensile strength. Determination shall be made at crosshead speed of not more than 0.125 inch per minute with an extensometer reading to 0.0002 inch. The extensometer shall be read at increments of stress not exceeding 5,000 pounds per square inch. The stress at which the strain first exceeds stress (pounds per square inch) plus 0.005 (inches per inch) 30,000,000 (pounds per square inch) shall be recorded as the elastic limit. Elongation must be at least 20 percent and reduction of area at least 35 percent. Test specimen must be 0.505 inch in diameter within 2-inch gage length. [As amended Jan. 13, 1932]*+ [Par. 2] NOTE: Upon approval, the ratio of elastic limit to ultimate strength may be raised to permit use of special alloy steels of definite composition that will give equal or better physical properties than steels herein specified. **For statutory and source citations, see note to § 72.1A-1. Page 881 72.107A-3 Thickness of wall. (a) Minimum thickness of wall of each finished tank must be at least one-half inch and must be such that the factor of safety, based on minimum tensile strength of material, as determined by tests required in § 72.107A-2 (d), (e), will be at least 3.6 at pressure developed at 130° F. by the gas which the tank is designed to transport. (b) Calculation of fiber stress must be made by the formula D2+d2 which, transposed to solve for internal pressure, is— D2-d2 and, transposed to solve for outside diameter, is and, transposed to solve for inside diameter, is— where S=stress in pounds per square inch at inner wall; P=internal pressure in pounds per square inch; D=outside diameter of tank, inches; and d=inside diameter of tank, inches. (c) Tank heads must be of thickness sufficient to meet test requirements of § 72.107A-10, and to provide for openings therein as prescribed in § 72.107A-4 (b).*+ [Par. 3, as amended Jan. 13, 1932] 72.107A-4 Tank heads. (a) Tank head cover must be made of forged steel and be secured to tank by through bolts or studs not entering interior of tank. Joint of cover must be of approved form, tight against vapor pressure, and when necessary to secure this tightness, a suitable, confined gasket must be used. (b) All valves and other connections in tank heads must be of flanged type, designed for confined gaskets.*+ [Par. 4, as amended Jan. 13, 1932] 72.107A-5 Anchorage. The manner in which tanks are supported on and securely attached to car structure must be approved.*** [Par. 5, as amended Jan. 13, 1932] 72.107A-6 Protective housing. Safety devices and venting, loading, and discharge valves on tanks must be protected from accidental injury by approved metal housing, arranged so it may be readily opened to permit inspection and adjustment of safety devices and valves, and securely locked in closed position. Housing must be provided with opening having area equal to twice the total discharge area of safety devices enclosed.*+ [Par. 6, as amended Jan. 13, 1932] 72.107A-7 Venting, loading, and discharge valves. These valves must be of approved type, made of metal not subject to rapid Page 882 **For statutory and source citations, see note to § 72.1A–1. |