AFT DECK CRANE R/V SIKULIAQ Maximum Capability Document
Manufactured By: Appleton Marine, Inc. Model: KEB190-50-30 Reference Drawing Number: BMD-0643 Prepared By: [Company Name] [Engineer’s Name/Stamp]
[Date]
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1. Abbreviations ABL Assigned Breaking Load MCD Maximum Capability Document MPT Maximum Permissible Tension NBL Nominal Breaking Load NSF National Science Foundation UNOLS University-National Oceanographic Laboratory System
2. Purpose This document describes the general arrangement of the Aft Deck Cranes installed onboard the vessel R/V Sikuliaq and it establishes the guidelines for their usage with respect to load capacities and reeving. Both cranes can be used in two configurations, hoisting in the traditional sense, as a weight handling crane or, as an overboarding appliance for science winches providing over-the-side deployment or towing of science packages. In the hoisting configuration the load is handled entirely by the crane and its winch system. In the over-the-side deployment configuration the load is handled by the crane structure, used as an overboarding boom, and either the shipboard winches or an independent winch located elsewhere on the vessel. For hoisting operations the document will establish the maximum capacity of the crane for three environmental operating conditions, pier side or in protected waters, and in the open ocean up through Sea State 5 for both onboard and offboard lifts. A separate capacity is also established when using the crane to handle personnel. This document sets the Maximum Permissible Tensions (MPT) under the various operational loading conditions as required by the UNOLS RVSS, Appendix B when the crane is used to support over-the-side operations for science. Operational conditions will include various crane positions, load geometries and companion winch locations. The Aft Deck Cranes are intended for “Lifting and Towing, Deep Water” per Section B.3.5 of Appendix B. The external tension member employed over the removable sheave is considered a component of the entire handling system and shall be used in accordance with Appendix A. The NBL of the tension member shall be less than the MPT for the given operation, or the maximum tension otherwise limited, as described below. Likewise, all shackles and blocks attached to the crane’s towing padeye are considered components and must have their MCD documents provided for full system evaluation. 3. General 3.1. Description The port and starboard aft deck cranes are knuckle-boom type, pedestal mounted electro- hydraulic cranes designed to support both dockside mobilization and at-sea operations. At sea the cranes are designed for usage up through sea state 5 and can be used to launch, recover, and/or tow a wide variety of science packages from the ship’s main deck, over the rail and into the water and to the bottom. Figure 1 depicts the general arrangement of the stowed crane. In addition to the boom and jib, the jib features a hydraulically powered extension to provide Page 2 of 9 additional reach. The jib extension terminates with a bolting flange to which the boom tip is attached. As required the tip can be removed and repplaced to facilitate docking heads or other appliances for lifting or towing operations. For other over-the-side operations the cranes are also fitted with a science padeye on the underside of the jib. A 36” diameter instrumented sheave may be fitted to this padeye and used in conjunction with either one of the ship’s permanently mounted winch systems or a temporary deck mounted winch. This allows either crane to vertically deploy or tow science packages outboard of the vessel. The jib also features an auxiliary winch foundation which can accommodate an additional winch to be used in conjunction with the science padeye or one of the alternate boom tips such as a docking head.
Figure 1 Aft Deck Crane General Arrangement-Stowed Figure 2 depicts the working range of the crane for all angles and jib extensions. Figure 3 depicts an elevation view showing the maximum hook height of 66’- 4” above the main deck when the crane boom and jib are raised to their highest angle and the jib is at full extension. Figure 4 depicts the plan view of the aft deck showing the maximum reach at full jib extension for the crane two part block as well as maximum reach for the boom mounted science padeye.
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While towing and handling loads suspended from a sheave attached to science padeye, the crane can be used with a wire/cable having a maximum NBL of 46,000 LBS (23 S.Tons). 3.2. Reference Documents 3.2.1. UNOLS Rope and Cable Safe Working Load Standards, Appendix A. 3.2.2. UNOLS Overboard Handling Systems Design Standards Criteria for the Design and Operations of Overboard Handling Systems, Appendix B. 3.2.3. A-frame General Arrangement Drawing. CS Controls drawing number xxx. 3.2.4. Shipboard installation General Arrangement Drawing. MMC Overside Handling Arrangement Rev B drawing number 07096-714-01. 3.2.5. 36" Sheave and Shackle Installation Drawing. ACME mfg drawing number xxx. 4. Crane Operational Requirements 4.1. Crane used for normal hoisting. When used for normal hoisting (no attachments to the science padeye) the maximum load that can be lifted by the crane is determined by the radius of the hook and the environmental operating conditions as shown in Table 1. Table 1 KEB190-50-30 Load Capacity Chart Sea State 5 Sea State 5 Personnel Dock Side Radius Onboard Offboard Rated Capacity Capacity Capacity Capacity (ft) (lbf)
6.98 35,437 13,000 35,437 2,000
10.00 35,437 13,000 35,437 2,000
15.00 35,437 13,000 35,437 2,000
20.00 35,437 13,000 35,437 2,000
25.00 28,846 13,000 35,437 2,000
30.00 23,846 8,000 28,000 2,000
35.00 19,230 5,000 23,000 2,000
40.00 15,625 3,000 20,000 2,000
45.00 12,500 2,500 17,000 2,000
50.00 9,357 2,000 15,000 2,000
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4.1.1. Sea State 5 Onboard Capacity refers to all lifts made from and to the deck of the vessel while operating at sea in up through Sea State 5. 4.1.2. Sea State 5 Offboard Capacity refers to all lifts made from or to the sea while the vessel is operating in up through Sea State 5 conditions. Deploying an AUV over the side would be an example of an Offboard lift. 4.1.3. Dock Side Capacity refers to all lifts performed while the vessel is dock side or in sheltered waters. 4.1.4. Personnel Rated Capacity refers to all lifts used for handling personnel
Figure 2 Model KEB190-50-30 Working Range
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4.1. Crane Used as an Over-boarding Appliance When the crane is used with a sheave on the science padeye, and used in conjunction with the ship’s fixed winches (through either the port or starboard flag blocks) or an external deck mounted winch system the maximum capacity of the crane is dependent on a number of variables. The spreadsheet in Appendix A calculates the axial and bending loads in the crane boom based on winch location, boom location and wire characteristics. The spreadsheet identifies whether the arrangement being considered is within the structural capacity of the crane. For each configuration the following user inputs will be required (note: refer to geometry definition sketch in Appendix A): Crane slew angle Wire ABL Portable winch location (relative to the crane), or Identification of on-board winch being used
4.2. Use of crane winch while towing from Science Padeye When used in the towing configuration the maximum simultaneous hook load that can be lifted by the crane’s two part block is limited to XXX lbs
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Figure 3 Aft Deck Machinery General Arrangement & Maximum Hook Height Outboard Elevation View
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Figure 4 Aft Deck Machinery General Arrangement & Maximum Hook Reach Plan View
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Figure 8 Load Handling with Boom Tip Padeye, Jib Retracted (31 ft radius) Plan View
Appendix A
Science Padeye Load Calculation Spreadsheet.
Figure 12 Load Handling with Boom Tip Padeye, Jib Extended (50 ft radius) 0-4 ft Max Wire Height Stern Elevation View
Figure 9 Load Handling with Boom Tip Padeye, Jib Retracted (31 ft radius) 0-4ft Max Wire Height Stern Elevation View
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