method, detached test plates may be welded as provided for in AAR-6 (d-2). The plates for test samples may be taken from any part of one or more plates of the same lot of material that is used in

chromium and 0.0015 for any of the chromium nickel alloys of the 18% chromium 8% nickel type and modified chromium nickel type, this figure to be an average of five 48-hour periods. ICC-3. (b) This paragraph does not the fabrication of the welded tanks and apply.

without reference to the direction of the mill rolling. When more than one weld

ing operator is employed on a car tank, the required test plates for the individual tank shall be made by the welding operator designated by the inspector.

AAR-3. (a) All plates, forgings, tubes, AAR-6. (d-4) Where the welding has valve castings and rivets must be in ac- warped the test plates they shall be cordance with AAR Specifications for straightened before being annealed. The materials meeting requirements of par- test plates shall be subjected to the same agraph ICC-3 (a). annealing operation as required by AARAAR-3. (c) This paragraph does not 6 (p). At no time shall the test plates apply. be heated to a temperature higher than ICC-4. (b) This paragraph does not that used for annealing the tank.

apply. AAR-6. Test specimens. (e) The inICC-4. (d) This paragraph does not spector shall select one of the two welded test plates from which the coupons for tension, corrosion, and bend tests and

apply. AAR-4. (c) Car must have under- for specific-gravity determinations shall

frame.

ICC-6. (b) Manhole ring, safety valve flange, and sump flange or other attachments may be riveted or fusion welded. Riveted joints must be made metal to metal without interposition of any other material. Rivets, if used, must be driven hot and calked inside. For computing rivet areas the effective diameter of a driven rivet is the diameter of its reamed hole, which hole must in no case exceed nominal diameter of rivet by more than 16 inch. Use of rivets of less than 5% inch nominal diameter prohibited. Fusion-welding for securing these attachments in place must be of the double-welded butt joint type or doublefull-fillet-lap joint type.

be removed as shown in Fig. 16 and be of the dimensions shown in Figs. 11 and 16.

AAR-6. (f-2) The tensile strength of the joint specimen in Fig. 16 shall not be less than the minimum of the specified tensile range of the plate used. (The tension test of the joint specimen as specified herein is intended as a test of the welded joint and not of the plate).

AAR-6. (f-3) The tension-test specimen of the weld metal shall be taken entirely from the deposited weld metal and shall meet the following requirements:

Tensile strength at least that of the minimum of the range of the plate which is welded:

Elongation, minimum=15 percent in 2 inches.

For plate thicknesses less than % inch, the all-weld-metal tension test may be omitted.

AAR-6. Test plates. (d-1) Two sets of test plates of the dimensions shown in Fig. 16 from steel of the same specifications and thickness as the shell plates, prepared for welding, may be attached AAR-6. Specific gravity of weld metal. to the shell plate being welded, as in Fig. (h) Specimens shall be taken from the 9, one set on each end of one longitudi-weld metal of the joints. The specificnal joint of each tank so that the edges to be welded in the test plates are a continuation of and duplication of the corresponding edges of the longitudinal joint. In this case the weld metal shall be deposited in the test plates continuously with the weld metal deposited in the longitudinal joint. As an alternate

gravity specimens shall, if possible, be 2 inches long and % inch in diameter, as shown in Fig. 16. The minimum specific gravity shall be not less than 99.0% of the alloy plate used.

AAR-6. (i–5) Should the specific gravity obtained on the specific-gravity spec

imen be less than 98.5%, no retest shall | tom of any vent pipe projecting inside be allowed. Should the specific gravity dome, of at least 1 percent of the total lie between 98.5% and 99.0%, a retest capacity of the tank and dome combined. shall be allowed on specimen cut from the second test plate. The retest shall show a specific gravity of not less than 99.0% of the alloy plate used.

AAR-6. Preparation for welding. (1-1) The plates may be cut to size and shape by machining or shearing. The plates or sheets to be joined shall be accurately cut to size and formed. In all cases the forming shall be done by pressure and not by blows, including the edges of the plates forming longitudinal joints of tanks.

ICC-9. (b) The opening in manhole ring must be at least 18 inches in diameter. The opening in the tank shell within the dome must be at least 29 inches, in diameter, and when the inside diameter of the dome exceed 29 inches, the opening in the tank shell may be cut out to a diameter sufficiently greater than that of the dome to permit welding of tank shell to the base of the dome. When the inside diameter of the dome exceeds 30 inches and the shell of tank is cut out as provided to permit welding, the tank shell at this point must be adequately reinforced. When the tank shell is not cut out to permit welding and the opening in tank shell does not exceed 30 inches in diameter, no reinforcement is required but the joint between the base of the dome and the tank shell must be sealed on the inside in an approved manner and dome pocket drain holes must be provided with nipples projecting inside the tank at least one inch.

AAR-6. (1-9) For double-welded butt joints the reverse sides shall be chipped or ground, so as to secure a clean surface of the originally deposited weld prior to the application of the first bead of welding on the second side. Such chipping or grinding shall be done in a manner that will insure proper fusion of the weld metal. These requirements are not intended to apply to any process of welding by which proper fusion and penetration are otherwise obtained and no impurities remain at the base of the weld. AAR-6. Heat treatment. (p) Tank must be heat treated after all welding is ICC-10. Closures for manhole. (a) completed to remove stresses and at the The manhole cover must be of approved proper temperature to obtain the corro-type and designed to provide a secure sion resistance specified in Paragraph ICC-3 (a). Such heat treatment shall be in accordance with the current AAR Specifications. Test plates must be heat treated with and at the same time as the tank.

AAR-6. Repairs during original construction. (s-1) Pinholes, cracks, or other defects in welded joints shall be repaired only by chipping or machining the defect and rewelding.

ICC-9 (c) A dome head and manhole ring in one piece may be used instead of a dished plate dome head.

closure of the manhole.

ICC-10. (b) Manhole rings and covers must be made of the metal prescribed in paragraph ICC-3.

ICC-10. (c) Requirements of this paragraph optional.

AAR-10 (a) This paragraph does not apply.

discharging, and air inlet devices extendICC-11. Gauging, venting, loading and ing through domes of tanks. (a) These AAR-6. (s-2) Tanks shall be heat devices when installed must be tightly treated, per paragraph AAR-6 (p), after closed as prescribed in paragraph 12 and any welding repairs have been made. be of approved design. Protective housICC-7. Heat treatment. (a) All weld-ing of approved design covering all these ing of the tank shell and of attachments devices must be installed. Discharging welded directly thereto must be heat (syphon) pipe must be securely anchored. treated as a unit. ICC-12. Gauging, venting, loading and AAR-7. Heat treatment. (a) See discharging, and air inlet devices. paragraph AAR-6 (p).

ICC-9. Expansion dome. (a) The expansion dome must have a capacity, measured from the inside top of shell of tank to the inside top of dome or bot

(a)

These devices when installed must be tightly closed with approved caps, plugs, valves, or other suitable fittings. Provision must be made for closing pipe connections of valves.

ICC-13. Bottom discharge outlets. | ICC-15. Fixtures, reinforcements, and (a) Bottom discharge outlet prohibited attachments not otherwise specified. (a) for cars to be used for transportation of All attachments to tank and dome must corrosive liquids. Bottom sump of cast, be applied by approved means. When pressed, or forged metal is permissible. attachments are riveted the edges If used and welded to tank, it must be of of plates must be beveled so that the ancast, pressed, or forged metal and be of gle of the calking edge will be between good weldable quality in conjunction 60 and 70 degrees with the flat surface with metal of tank. of the attachment. The extreme calking edge distance, measured from center line of rivet hole, must be at least one and one-half times the diameter of the

FIGURE 16.-Test specimens from longitudinal welded test plates.

T-Thickness of tank plate.

t-Thickness of test specimen.

NOTE: Where T is less than " the density and corrosion specimens are to be of a diameter or thickness=T.

AAR-1. (a) See paragraph ICC-1 (b).
ICC-11. Gauging, bottom outlet valve

years after the original test, and subsequent retests at four-year intervals up to 12 years of service, thereafter at two- | operating, venting, loading and dischargyear intervals up to 20 years of service, and annually after 20 years of service. Tanks in service over 12 years must be internally inspected and heater systems inspected for defects which would make leakage or failure probable during transit and must be tested with water only. Tank must also be retested before being returned to service after any repairs requiring welding, riveting, or calking of rivets. Heater systems must be retested after repairs. Reports must be rendered as prescribed in paragraph 21.

ICC-20. (b) ICC-103C-W in letters and figures at least 3 inch high stamped plainly and permanently into the metal near the center of both outside heads of the tank by the tank builder. This mark must also be stenciled on the tank, or jacket if lagged, in letters and figures at least 2 inches high by the party assembling the completed car.

ing, and air inlet devices extending through domes of tanks. (a) Venting and loading and discharging devices of approved design must be installed. Gauging, bottom outlet valve operating and air inlet devices are not specification requirements. These devices when installed, including their valves, must be protected from accidental injury by being set into a securely covered recess, or by means of a cast or pressed steel or malleable iron housing with cover securely attached. Openings in wall of housing must be equipped with screw plugs or other closures. Drain holes permitting. Housing, if welded to dome of tank, must be of cast, forged or pressed metal and be of good weldable quality in conjunction with metal of dome. Discharging (syphon) pipe must be securely anchored.

ICC-13. (c) This paragraph does not

ICC-20. (h) This paragraph does not apply. apply.

SHIPPING CONTAINER SPECIFICATION

ICC-14. (e) Tanks used for the trans104-portation of inflammable liquids or other commodities having vapor pressures ex

W-LAGGED FUSION-WELDED STEEL TANKS

TO BE MOUNTED ON OR TO FORM PART OF ceeding 27 pounds per square inch, abso

A CAR

lute, at 100° F. and not exceeding 40 pounds per square inch, absolute, at 100° F. must have the safety valves set to open at a pressure of 35 pounds per square

A. General requirements. Tanks built under this specification must comply with all provisions of specification 103-W, ex-inch. (For tolerance see paragraph 18.) cept as modified in the following paragraphs (paragraph numbers refer to like numbers in specification 103-W):

This specification covers class ICC104-W tank cars to which have been added A. A. R. details which are not inconsistent therewith.

ICC-17. Tests of tanks. (a) Each tank must be tested, before being put into service and before lagging is applied, by completely filling tank and dome with water, or other liquid having similar viscosity, of a temperature which must not exceed 100° F. during the test, and applying a pressure of 60 pounds per square

I. C. C. Specification effective January inch. Tank must hold the prescribed 7, 1941.

pressure for at least 10 minutes without

A. A. R. Specification effective Janu- leakage or evidence of distress. All rivets ary 7, 1941. and closures, except safety valves or safety vents, must be in place while test is made.

ICC-1. (b) The tank shell and dome must be lagged with an approved insulation material of a thickness so that the thermal conductance is not more than | 0.225 B. t. u. per square foot per degree Fahrenheit differential in temperature per hour. The entire insulation must be covered with a metal jacket efficiently flashed around all openings so as to be weathertight.

AAR-17. (c) See paragraph ICC-17 (a).

ICC-18. (b) Each valve on tank cars used for the transportation of inflammable liquids or other commodities having vapor pressures exceeding 27 pounds per square inch, absolute, at 100° F. and not exceeding 40 pounds per square inch,