tached hereto. The heat numbers (Were were not) marked on the material. All material was inspected and all that was accepted was found free from seams, cracks, laminations and other injurious defects. The compliance of cylinders with specification requirements was verified including markings, condition of inside, tests, threads, etc. All cylinders with defects which might prove injurious were rejected. The proc esses of manufacture and heat treatment were supervised and found to be efficient and satisfactory. The cylinder walls were measured and the minimum thickness noted was inch. The outside diameter was determined by a close approximation to be inches. The wall stress was calculated to be ----- pounds per square inch. test reports are in the files of the manufacturer. Note: Any omission of analyses by heats, if authorized, must be accounted for by notation hereon reading "The prescribed certificate of the manufacturer of material has been secured, found satisfactory, and placed on file," or by attaching a copy of the certificate. Chemical analyses were made by NOTE: When specifications require test for only 1 out of each lot of 200 or less cylinders, the check on the others must be indicated by a notation hereon reading, "Each cylinder was subjected to a pressure of pounds per square inch and showed no defect." ----- If the tests are made by a method involving the measurement of the amount of liquid forced into the cylinder 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 removable cap but state whether with or without valve. These weights must be accurate to a tolerance of 1 percent. Report approximate maximum and minimum volumetric capacity for the lot. [Order 13, 19 F. R. 1283, Mar. 6, 1954] (Signed) § 78.56-22 Guided bend test jig. (a) Dimensions as follows: NOTE: Dimensions shown for die and plunger are for " thick material only. The following dimensions shall be used for other thicknesses. Thickness of plunger member=4X thickness of test specimen. Radius of plunger member=2x thickness of test specimen. Width of opening, die member=6× thickness of test specimen +%". Radius of die member=3x thickness of test specimen+6". [Order 13, 19 F. R. 1284, Mar. 6, 1954] § 78.56-23 Alternate guided bend test jig. (a) Dimensions as follows: NOTE: Dimensions shown are suitable for bending lap-weld specimens of 0.05" to 0.133" material thickness. A piece of 2" pipe may be slipped over the mandrel for turning. For any specimen thickness, fillers of appropriate thickness shall be added to one or both sides of the specimen as shown to obtain the required elongation. 1 § 78.57-2 Type, size, service pressure and service temperature.' (a) Type and size. Must be fusion welded; not over 1,000 pounds water capacity (nominal). (b) The service pressure shall be at least 150 and not over 500 pounds per square inch. (c) The service temperature shall be minus 320° F. [Order 27, 21 F. R. 7605, Oct. 4, 1956] $ 78.57-3 Inspection by whom and where. (a) By competent inspector; chemical analyses and tests, as specified, to be made within limits of the United States. Interested inspectors are authorized. [Order 27, 21 F. R. 7605, Oct. 4, 1956] 1 The service pressure limits the use of the cylinder. It is shown by marks on the cylinder; for example: ICC-4L200 indicates the service pressure as 200 pounds per square inch. 2 The service temperature is the lowest temperature at which the cylinder may be used. D $ 78.57-4 Duties of inspector. (a) Inspect all material and reject any not complying with requirements of this specification. (b) Verify chemical analysis of each heat of material by analysis or by obtaining certified analysis: Provided, That a certificate from the manufacturer thereof, giving sufficient data to indicate compliance with requirements, is acceptable when verified by check analyses of samples taken from one cylinder out of each lot of 200 or less. (c) Verify compliance with all specification requirements. Obtain samples for all tests. Obtain samples for check chemical analyses, where required. Witness all tests. Report volumetric capacity, tare weight (see report form), and minimum thickness of wall noted. (d) Render complete report (§ 78.57-22) to purchaser, cylinder maker, and the Bureau of Explosives. [Order 27, 21 F. R. 7605, Oct. 4, 1956] § 78.57-5 Material. (a) Designations and limiting chemical compositions of steel authorized by this specification shall be as shown in § 78.57-21 (a), Table I. [Order 27, 21 F. R. 7605, Oct. 4, 1956] § 78.57-6 Identification of material. (a) Required; by any suitable method. [Order 27, 21 F. R. 7605, Oct. 4, 1956] § 78.57-7 Defects. (a) Material with seams, cracks, laminations, or other injurious defects, not authorized. [Order 27, 21 F. R. 7605, Oct. 4, 1956] § 78.57-8 Manufacture. (a) By best appliances and methods; dirt and scale to be removed as necessary to afford proper inspection; no defect acceptable that is likely to weaken the finished cylinder appreciably; reasonably smooth and uniform surface finish required. The shell portion must be a reasonably true cylinder. (b) The heads must be seamless, concave side to the pressure, hemispherical or ellipsoidal in shape with the major diameter not more than twice the minor diameter. Minimum thickness of heads shall be not less than 90 percent of the required thickness of the sidewall. The heads must be reasonably true to shape, shall have no abrupt shape changes and the skirts must be reasonably true to round. (c) The surface of the cylinder must be insulated. Any insulating material must be fire resistant. The insulation must be covered with a steel jacket of not less than 0.060 inch thickness so constructed that moisture cannot come in contact with the insulating material. The construction must be such that the total heat transfer from the atmosphere at ambient temperature to the contents of the cylinder shall not exceed 0.0005 B. t. u. per hour per degree F differential in temperature per pound of water capacity of the cylinder. [Order 27, 21 F. R. 7605, Oct. 4, 1956] § 78.57-9 Welding. (a) All seams of the cylinder must be fusion welded. Means must be provided for accomplishing complete penetration of the joint. Only butt or joggle butt joints for the cylinder seams are authorized. All joints in the cylinder must be in reasonably true alignment. (b) All attachments to the sidewalls and heads of the cylinder must be by fusion welding and must be of a weldable material complying with the impact requirements of § 78.57-17 (d). (c) For welding the cylinder, procedure and operators must be qualified in accordance with the sections that apply in the Compressed Gas Association's "Standards for Welding and Brazing on Thin Walled Containers" (CGA Pamphlet C-3-1954). (d) Brazing, soldering and threading are permitted only for joints not made directly to the cylinder body. Threads must comply with § 78.57-12. [Order 27, 21 F. R. 7605, Oct. 4, 1956] (a) The § 78.57-10 Wall thickness. minimum wall thickness of the cylinder shall be such that the calculated wall stress at minimum required test pressure shall not exceed the least value of the following: (1) 45,000 pounds per square inch. (2) One-half of the minimum tensile strength across the welded seam determined as required in § 78.57-17 (a). (3) One-half of the minimum tensile strength of the base metal determined as required in § 78.57-15. (4) The yield strength of the base metal determined as required in § 78.57-15. S=wall stress in pounds per square inch; P= minimum test pressure prescribed for hydrostatic test; D outside diameter in inches; d inside diameter in inches. [Order 27, 21 F. R. 7605, Oct. 4, 1956] § 78.57-11 Heat treatment—(a) Per. missible. If heat treatment is used each cylinder must be uniformly and properly heat treated as required in § 78.57-21 (a), Table I, after all forming and prior to test. [Order 27, 21 F. R. 7605, Oct. 4, 1956] § 78.57-12 Openings in cylinder. (a) Openings permitted in heads only. They must be circular and shall not exceed 3 inches diameter or 3 of the cylinder diameter, whichever is the smaller. Each opening in the cylinder must be provided with a fitting, boss or pad securely at Available from the Compressed Gas Association, Inc, 11 West 42d Street, New York 36, N. Y. |