MSI LIFTING LUG & PAD EYE DESIGN GUIDELINESDated: 28th Feb 2002 2.Contents 1. 3. “ Guideline for Lifting Equipment”. Appendix B Example: Shackle Crosby Bow and Dee Type 1 . General Design Consideration for Lifting Point Pad Eye Design Appendix A Example: Pad Eye Detail based on APEA. AS 4100 Steel Structures AISC Manual of Steel Construction (ASD). and the weight of the rigging as part of the load weight. g. c. Maximum hoist speed. e. All Approved Lifting Point should be subject to inspection and NDT by competent person. 2. “Guidelines for Lifting Equipment”. arc welding. etc. Wave height and period. Lifting points should be free from any detrimental defects caused by oxy-cutting. Drag loads on equipment to be lifted in water. Weight growth potential. d. BS5950:Part 1: 1990 Structural Steel Eurocode 3: BS ENV 1993 Design for Steel Structures. 9th Edition. The NDT report should be submitted to MSI for filing. Local eccentricities arising from pad eye connection details. material specification and welding requirement must be clearly presented in the drawing. Wind speed 2 . General All Permanently attached lifting points on all new equipment constructed after 1st March 2002 for MSI should be designed to recognize Principal National Standards or Classification Guidelines. Design Consideration for Lifting Point The design should consider but not be limited to: • • • • • • • • • • • Weight uncertainty. Load test will only be done on case to case basic. All calculation. b. the weight of the hook and hook block. h. Diagonalling effects. dimension. f. 1989.1 Structural Welding Code – Steel for Oil Field Service The design of the surrounding structure to which lifting points are affixed should allow transmission of the load from the lifting point to the surrounding structure. Eye Bolt is not to be used for lifting point.MSI LIFTING LUG / PAD EYES DESIGN GUIDELINES 1. AISC Load and Resistance Factor Design Specification for Structural Steel Buildings. Adequate clearances should be provided between the pad eye and the rigging. AWS D1. 1999. Uncertainty in Center of Gravity. Example: a. DNV Offshore Freight Containers Design and Certification Australian Petroleum Production & Exploration Association Limited. Reviewing the load Radius Chart for the “Lifting Device” (Crane) taking into account the weight of crane rope over the head sheave. All Lifting Point design must be approved by MSI before beginning of construction. Dynamic amplification factor (DAF) . Appendix B has shown an example of the dimension of Crosby Shackle that meet the required U.Determine of required Design Load Pad Eyes should be designed for a total vertical load of: 3 X R x g.S. 3 .S. The load should be considered as evenly distributed between (n-1) pad eyes where n is the actual number of padeyes. On units with a single point suspension (e. Hole sizes in pad eyes should be bored or drilled to provide a diameter equal to the shackle pin diameter plus 3mm or 4% greater than the shackle pin diameter. so that the resulting sling load (RSL) on each padeye will be: 3XRXg RSL = (n-1) X cos v Where v is the angle of a sling leg from vertical. The thickness of the pad eye should be at least 75% of the shackle width to avoid “twisting” the shackle. whichever gives the larger hole. Appendix A shown an example of the Pad Eye design from APEA. Bolted on pad eyes should not be used on offshore containers. Federal Specification RR-C-271D In short.3. This is to prevent damage to the pad eyes and over loading of the undersized shackle. bottlerracks). The maximum thickness of the pad eye shall be such that a total minimum gap of 5mm is maintained to avoid “binding”. The required thickness of the padeye should be based on the following shackle standard unless otherwise specified by MSI. the load of 3XRXg is of course taken by this single padeye. Federal Specification RR-C-271D. of Lifting Point or Padeyes The steel grade used for pad eyes shall be clearly specified on the design drawings. the determined pad eye’s hole size and thickness with respect to shackle dimension to ensure that shackle with smaller capacity will not be able to be placed into the pad eyes. Rating: R = Max. Federal Specification RR-C-271D. Preferable A516 material. U.S. mass of cargo. gross mass. Guidelines for Lifting Equipment. Pad Eye Design Load . the sling angle must be taken into account. a.g.81 m/s2 n = No. For resulting sling force on the pad eyes. kg or tones G = Standard acceleration of gravity = 9. kg or tones Payload: P = Max. The shackle dimension and loading is similar to the specification stated in U. APPENDIX A Pad Eye Detail based on APEA. “Guideline for Lifting Equipment” 4 . 5 . 6 . APPENDIX B SHACKLE CROSBY BOW TYPE: MODEL: 2130 DEEE TYPE: MODEL: 2150 7 . Bow & Dee Shackle -Crosby G2130 & 2150 Shackle Note: Reference to Crosby Catalogue. “Block & Fitting for Wire Rope & Chain”. 8 . Page 69. 9 .