دانلود کتاب کشتی های فولادی برای خدمات در رودخانه ها و آبراه های درون ساحلی

These Rules are intended for barges and vessels of welded construction using steels complying with the requirements of Chapters 1 and 2 of the ABS Rules for Materials and Welding (Part 2). Use of steels other than those in Chapters 1 and 2 of the above Part 2 and the corresponding scantlings will be specially considered. Where it is intended to use material of cold flanging quality, this steel is to be indicated on the plans. ASTM A36 steel otherwise manufactured by an ABS approved steel mill, tested and certified to the satisfaction of ABS may be used in lieu of Grade A for a thickness up to and including 12.5 mm (0.5 in.) for plates and up to and including 19 mm (0.75 in.) for sections. When tensile stresses through the thickness (Z direction) exceed approximately 50% of the minimum specified yield stress (as defined in the applicable ABS Rules), consideration is to be given to applying Z grade steel (refer to 2-1-1/17 of the ABS Rules for Materials and Welding (Part 2)). Alternatives to applying Z grade may be proposed provided it is demonstrated by ultrasonic testing before and after welding that no through thickness tearing has occurred, and/or the welding preparation, weld size and bead sequence is such that damaging through thickness loads induced by weld shrinkage are avoided. The use of aluminum alloys in hull structures will be considered upon submission of the proposed specification for the alloy and the method of fabrication. Where scantlings are reduced in connection with the use of higher-strength steel or where aluminum alloys are used, adequate buckling strength is to be provided. Where it is intended to use material of cold flanging quality for important longitudinal strength members, this steel is to be indicated on the plans. Where a special welding procedure is required for the special steels used in the construction, including any low temperature steel and those materials not in Chapters 1 and 2 of the ABS Rules for Materials and Welding (Part 2), a set of plans showing the following information for each steel should be placed aboard the barge or vessel.