BS-MA-81-1980.pdf

BRITISH STANDARD MARINE SERIES BS MA 81:1980 Specification for Ships derrick fittings UDC 629.12.011:621.873.134 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:20:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 81:1980 This British Standard, having been prepared under the direction of the Shipbuilding and Marine Standards Committee, was published under the authority of the Executive Board and comes into effect on 28 November 1980 © BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference SME/13 Draft for comment 77/70698 DC ISBN 0 580 11567 4 Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:20:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 81:1980 © BSI 02-2000i Contents Page Forewordii 1Scope1 2References1 3Terminology and descriptions1 4Axial and permissible loads2 5Nominal sizes2 6Materials2 7Construction and quality of manufacture2 8Testing, inspection and certification3 Figure 1 Typical derrick rig arrangement showing locations of fittings4 Figure 2 Gooseneck bearing assembly5 Figure 3 Topping swivel assembly6 Figure 4 Head fittings7 Figure 5 Heel fittings9 Figure 6 Heel cross-pins10 Figure 7 Gooseneck pins11 Figure 8 Gooseneck bearing brackets12 Figure 9 Heel blockholders13 Figure 10 Retaining rings and retaining pins for goosenecks14 Figure 11 Topping swivels and locating pins15 Figure 12 Topping swivel bearing brackets16 Table 1 Recommended materials2 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:20:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 81:1980 ii © BSI 02-2000 Foreword This British Standard has been prepared under the direction of the Shipbuilding and Marine Standards Committee and is based on a proposal of the British Ship Research Association. The proliferation of designs of ships derrick fittings in the UK to date has been the direct result of individual design and manufacturing practices operated by UK shipbuilders within the general guide-lines specified by the Regulatory Bodies. Among overseas shipbuilding countries, national standards were available and consequently the variation in basic design was not so great as in the UK, although in some instances dimensional variations still occur. In order to resolve this situation, the International Organization for Standardization (ISO) has scheduled a programme of work by Technical Committee ISO/TC 8/SC 2, Ships cargo handling appliances. Draft proposals for the standardization of some derrick fittings are at an advanced stage within ISO and these are based on a continental design. Since there are basic design differences between the continental methods and the UK methods, it has been necessary in the interest of International Standardization to introduce certain features of the continental designs into this standard, except for those instances where for economic and manufacturing reasons it was considered more beneficial to adhere to UK practices. This standard should be used in association with the companion standard BS MA 831). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 16 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) In course of preparation. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:20:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 81:1980 © BSI 02-20001 NOTEUsers of this British Standard Marine Series should note that while observing the requirements of this standard, they should at the same time ensure compliance with such statutory requirements, rules and regulations as may be applicable to the individual ship concerned. 1 Scope This British Standard specifies dimensions and recommends materials for ships derrick fittings suitable for axial or permissible loads ranging from 1.6 t to 40 t inclusive. Excluded from this standard are: a) the specification for tubular derrick booms, for which reference should be made to BS MA 832); b) the specification for securing bolts for the attachment of the cargo blocks to the heel blockholder or topping swivel, where special types of bolts with spring adjusters are sometimes used. 2 References This standard makes reference to the following standards publications. BS 499, Welding terms and symbols Part 2: Specification for symbols for welding. BS 970, Wrought steels in the form of blooms, billets Part 1: Carbon and carbon manganese steels including free cuttings steels. BS 1486, Lubricating nipples Part 1: Lubricating nipples and adaptors for use on machinery and vehicles. BS 1574, Split cotter pins metric and inch series. BS 4320, Metal washers for general engineering purposes. BS 4360, Specification for weldable structural steels. BS 5135, Metal-arc welding of carbon and carbon manganese steels. BS MA 10, Oval eyeplates. BS MA 48, Code of practice for design and operation of ships derrick rigs. BS MA 83, Specification for tubular derrick booms2). 3 Terminology and descriptions For the purposes of this standard the following terminology applies. NOTE 1Reference should be made to Figure 1, which gives an illustrated location of the fittings described below for a typical derrick rig arrangement. NOTE 2Figure 2 and Figure 3 respectively give detailed arrangements of the gooseneck bearing assembly and the topping swivel assembly shown in outline in Figure 1. 3.1 head fittings (see Figure 4) a double-ended eyeplate located near the free end of the boom and penetrating through the boom on the vertical centreline. The derrick head cargo block is attached to the lower part of the head fitting and the derrick head span block is attached to the upper part. For guy pendant connections, a head fitting is fitted through the boom on the horizontal centreline NOTEThe types of head fittings used on derricks are often referred to as sword fittings. 3.2 heel fitting (see Figure 5) a forked fitting welded into the lower end of the boom for connecting to the gooseneck pin. The fork permits the boom to be raised or lowered in a vertical direction (topped) 3.3 heel cross-pin (see Figure 6) the pin for securing the derrick boom via the heel fitting to the gooseneck pin 3.4 gooseneck pin (see Figure 7) a pin having a spade end and eye located at the top which connects with the forked heel fitting on the derrick boom. The centreline of the eye in the spade end is either in-line with the vertical centreline of the pin, i.e. straight type, or offset from the pin centreline away from the supporting structure towards the derrick boom, i.e. cranked type the gooseneck pin is free to revolve in its bearing bracket and thus permits the boom to be slewed 3.5 gooseneck bearing bracket (see Figure 8) a fabricated bracket welded to the ships mast, samson post, or superstructure, and having an upper and lower bearing into which the gooseneck pin fits 2) In course of preparation. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:20:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 81:1980 2 © BSI 02-2000 3.6 heel blockholder (see Figure 9) a thick steel ring incorporating either a single or double lug with drilled eye(s). The blockholder fits into the interspace between the upper and lower bearings on the bearing bracket and is free to rotate on the gooseneck pin. The cargo runner derrick heel lead block is secured to the lug(s) by means of a through pin or bolt 3.7 retaining ring with pin for goosenecks (see Figure 10) a steel ring fitting under the blockholder in the interspace between the upper and lower bearings on the bearing bracket. By means of a through pin, it is secured to the gooseneck pin and prevents this from being lifted out of the bearings. It also serves as a distance piece, in that, together with the heel blockholder, it makes up the vertical distance between the upper and lower bearings 3.8 topping swivel and locating pin (see Figure 11) a similar type of fitting to the heel blockholder (3.6) but located high up on the mast or samson post for the purpose of raising or lowering (i.e. topping) the derrick boom. The swivel has a spade end with a drilled eye for securing the mast head span block. The swivel is located in the bearing bracket by means of a vertical locating pin 3.9 topping swivel bearing bracket (see Figure 12) a fabricated support bracket attached to the mast or samson post 4 Axial and permissible loads 4.1 The axial and permissible loads shall be determined, from the safe working load (SWL) of the rig (but see note), in accordance with BS MA 48. The load capacity of the particular fitting selected, whether on the basis of axial thrust load or permissible load, shall not be less than the maximum load that will be exerted on the fitting, as determined by calculation. NOTEThe calculated load (axial or permissible) exerted on the individual fitting should not be regarded as the safe working load (SWL) of the complete rig, which will have to be determined according to the type of rig, purchase effects, effective boom length, suspension height, etc. Reference should be made to BS MA 48 for guidance on the design of complete rigs and the evaluation of the resulting loads in the various component fittings. 4.2 The derrick fittings detailed in Figure 4, Figure 8, Figure 9, Figure 11 and Figure 12 are not designated by nominal size, but by the permissible load that shall not be exceeded on the eye of the fitting. 5 Nominal sizes The nominal size designations of the derrick fittings given in the tables of Figure 5, Figure 6 and Figure 7 are for reference purposes and shall be selected according to the axial thrust load in the derrick boom. 6 Materials Recommended materials are listed in Table 1. Materials shall be suitable in all respects for the intended duty and shall be equally acceptable to the purchaser and Statutory Authority concerned. Table 1 Recommended materials 7 Construction and quality of manufacture 7.1 General. The fittings shall be constructed by fabricating, forging, profiling, and machining, as necessary, and shall comply with the form and dimensions specified for the appropriate fitting in Figure 2 to Figure 12. The fittings shall be free from any flaws that could precipitate failure when under loaded conditions. To avoid stress concentrations, corners shall be well rounded. 7.2 Welding. Where fittings are fabricated, the welding shall be carried out in accordance with BS 5135. The stress in any weld shall not exceed 85 N/mm2. PartComponentBS Specification Derrick boom attachments Head fittings Heel fittings BS 4360 grade 43Aa Gooseneck bearing assembly Steel plate BS 4360 grade 43Aa Bearings Gooseneck pins Heel blockholders Retaining rings Heel cross-pins BS 970 070M20 or BS 4360 grade 43Aa Retaining pinsBS 970 070M20 WashersBS 4320 Split cotter pinsBS 1574 Topping swivel assembly Steel plate BS 4360 grade 43Aa SwivelBS 970 070M20 or BS 4360 grade 43Aa Locating pinBS 970 070M20 WashersBS 4320 Split cotter pinsBS 1574 a Shipbuilding quality steel plate may be used provided that it is of equivalent mechanical and weldable properties. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:20:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 81:1980 © BSI 02-20003 NOTEThe welding symbols shown in the figures of this standard are in accordance with BS 499-2, and the associated dimensions are expressed in terms of weld throat thickness and not leg length. Weld sizes for the attachment of the gooseneck and topping brackets to the ships structure have been omitted from Figure 8 and Figure 12 as the weld size may vary, depending upon whether the brackets are mounted on to a curved or flat surface, and the actual area of metal-to-metal contact. In these cases, it shall be the responsibility of the shipbuilder to determine the weld size for the particular installation. 7.3 Flame cutting. Where fittings are profiled to shape by flame cutting, care shall be taken to ensure that an acceptable surface finish is obtained, or that surfaces are ground or machined as necessary. Wherever possible, the fibre direction of the plate shall be in the direction of the greatest stress. 7.4 Moving parts. All moving parts shall be adequately greased on assembly. NOTEReference should be made to Figure 2 and Figure 3 for illustrations and notes for the gooseneck bearing assembly and topping swivel assembly respectively. 8 Testing, inspection and certification Lifting equipment shall comply with certain statutory requirements specified by the Docks Regulations, 1934, and reference shall be made to these Regulations, an extract from which is given in BS MA 48. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:20:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 81:1980 4 © BSI 02-2000 Figure 1 Typical derrick rig arrangement showing locations of fittings Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:20:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 81:1980 © BSI 02-20005 Refer to Figure 7 for details of gooseneck pins Refer to Figure 8 for details of gooseneck bearing bracket Refer to Figure 9 and Figure 10 for details of heel blockholders, retaining rings and pins Figure 2 Gooseneck bearing assembly Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:20:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 81:1980 6 © BSI 02-2000 Refer to Figure 11 for details of swivel and locating pin. Refer to Figure 12 for details of topping swivel bearing bracket. Figure 3 Topping swivel assembly Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:20:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS MA 81:1980 © BSI 02-20007 Maximum permissible load on eye Oval eyecd (dia.) ehr1r2t1t2 ab t 2.0 mm 50 mm 27 mm 100 mm 25 mm 40 mm 88 mm 25 mm 38.5 mm 22 mm 25 2.555 29105 2740932839.5 2525 3.266 33126 3045 1033046.5 2830 4.077 36147 3350 11833533035 5.087 41167 3955 1233860.5 3540 6.391 45171 4260 132.5 4362.5 4040 8.0101 51201 4870 148.5 4875.5 4550 10.0117 56217 5275 16355785050 12.5128 61248 5680 177.5 6090.5 5560 16.0145 67265 6585 193.5 6593.5 6060 20.0157 73297 7495 211.5 70106.5 6570 25.0170 80331 78100 240751207080 32.0194 88374 86110 279851348090 40.0220 98420 96120 3099514990100 NOTE 1Where re