tailieunhanh - IADC Drilling Manual Part 9

Tham khảo tài liệu 'iadc drilling manual part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | IADC Drilling Manual - Eleventh Edition The most used practice is to use left-hand reeving and locate the deadline anchor to the left of the derrick vee. In selecting the best of the various possible methods for reeving casing or drilling lines the following basic factors should be considered. 1. Minimum fleet angle from the drawworks drum to the first sheave of the crown bloc and from the crown block sheaves to the traveling block sheaves. 2. Proper balancing of crown and traveling blocks. 3. Convenience in changing from smaller to larger number of lines or from larger to smaller number of lines. 4. Locating of deadline on monkey board side for convenience and safety of derrickman. 5. Location of deadline anchor and its influence upon the maximum rated static hook load of derrick. Figure M2-4 Reeving Diagram For 12-Line String-Up With 7-Sheave Crown Block And 6-Sheave Traveling Block Left Hand Reeving. B. Function of Reeving System 1. General A hoisting system is a way of listing heavy loads with lighter lead line pulling loads. As with a simple pulley system the line strung through the blocks allows you a mechanical lifting advantage. This mechanical advantage is equal to the number of lines strung between the crown and the traveling block taking into consideration accumulated friction. Thus for a 6-line system without friction you could lift a weight by pulling with a force of only 1 6 of the weight. With an 8-line system the pull will be only 1 8 of the weight with 10 lines 1 10 and so forth. The reason for this mechanical advantage is that the lines emerging from the traveling block divide the load equally among themselves by pulling down on the line as it leaves the traveling block. This is the load divided by the number of lines strung. 2. Work Encountered in Reeving System M-34 International Association of Drilling Contractors Chapter M Wire Rope By utilizing mechanical advantage of the pulley you are not decreasing the work done. Work done is the load .

TỪ KHÓA LIÊN QUAN
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.