1、BRITISH STANDARD BS 7464:1991 ISO 9089:1989 Specification for Anchor winches for mobile offshore unitsBS7464:1991 This BritishStandard, having been prepared under the directionof the General Mechanical Engineering Standards Policy Committee, waspublished under the authorityof the Standards Boardand
2、comes into effecton 30August1991 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference GME/32 Draft for comment 88/73329 DC ISBN 0 580 19913 4 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Gene
3、ral Mechanical Engineering Standards Policy Committee (GME/-) to Technical Committee GME/32, upon which the following bodies were represented: British Marine Equipment Council British Maritime Technology British Motor Ship Owners Association British Waterways Board Department of Transport (Marine Di
4、rectorate) General Council of British Shipping Lloyds Register of Shipping Ministry of Defence North East Cost Institution of Engineers and Shipbuilders Shipbuilders and Shiprepairers Association Amendments issued since publication Amd. No. Date CommentsBS7464:1991 BSI 01-2000 i Contents Page Commit
5、tees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Functional and operational requirements 1 5 Design and construction 2 6 Acceptance tests 3 7 Designation 3 8 Marking 4 9 Documentation 4 Publication(s) referred to Inside back coverBS7464:19
6、91 ii BSI 01-2000 National foreword This BritishStandard has been prepared under the direction of the General Mechanical Engineering Standards Policy Committee. It is identical with ISO9089:1989 “Marine structures Mobile offshore units Anchor winches”, published by the International Organization for
7、 Standardization (ISO). The Technical Committee has reviewed the provisions of ISO1704:1973, ISO2408:1985, ISO2944:1974, ISO3828:1984, ISO6482:1980, ISO7825:1985 and IEC92, and has decided that they are acceptable for use in conjunction with this standard. A British Standard does not purport to incl
8、ude 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. Cross-references International Standard Corresponding BritishStandard ISO 4413:1979
9、BS 4575 Fluid power transmission and control systems Part 1:1979 Guide for hydraulic equipment and systems (Identical) ISO 8369:1986 BS 302 Stranded steel wire ropes Part 7:1989 Specification for large diameter ropes for general purposes (Technically equivalent) Summary of pages This document compri
10、ses a front cover, an inside front cover, pagesi andii, pages1 to4, an inside back cover 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.BS7464:1991 BSI 01-2000 1 1
11、 Scope This International Standard specifies requirements of anchor winches for position keeping, and temporary and emergency anchoring of mobile offshore units, particularly drill-ships, semi-submersible drilling rigs and accommodation platforms. These requirements do not apply to anchor winches wh
12、ich are used for other purposes such as hauling the vessel as is the case for pipelaying, ploughing, pile-driving and crane vessels. NOTE 1Where national regulations and the rules of classification societies differ from this International Standard, they take precedence. NOTE 2The attention of users
13、is drawn to the mandatory adoption of some standards by international organizations or national administrations. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication,
14、the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of c
15、urrently valid International Standards. ISO 1704:1973, Shipbuilding Anchor chains. ISO 2408:1985, Steel wire ropes for general purposes Characteristics. ISO 2944:1974, Fluid power systems and components Nominal pressures. ISO 3828:1984, Shipbuilding and marine structures Deck machinery Vocabulary. I
16、SO 4413:1979, Hydraulic fluid power General rules for the application of equipment to transmission and control systems. ISO 6482:1980, Shipbuilding Deck machinery Warping end profiles. ISO 7825:1985, Shipbuilding Deck machinery General requirements. ISO 8369:1986, Large diameter steel wire ropes. IE
17、C 92:1965 to1988, Electrical installations in ships. 3 Definitions For the purposes of this International Standard, the definitions given in ISO3828 and the following definitions apply. 3.1 anchor winch cable-lifters for chain cable, drum units of twin drum units for wire or textile rope or units fo
18、r handling combined chain cable and wire or textile rope anchor line, collectively 3.2 anchor line chain cable, steel wire rope or textile rope or a combination thereof handled by the anchor winch 3.3 anchor winch side Side as defined in3.3.1 or3.3.2. 3.3.1 right-hand winch winch where, in relation
19、to an observer on the side of the motor, power supply or controller, the drive for the cable-lifter or wire-drum is on the right of the cable-lifter or wire-drum 3.3.2 left-hand winch winch where, in relation to an observer on the side of the motor, power supply or controller, the drive for the cabl
20、e-lifter or wire-drum is on the left of the cable-lifter or wire-drum 3.4 nominal load chain or rope tension that the winch is able to maintain continuously when hauling at nominal speed, measured either at the cable-lifter exit, or at the rope exit of the first layer in the case of a wire-drum 4 Fu
21、nctional and operational requirements 4.1 Hauling The winch shall be capable of exerting a pull of at least0,35 times the breaking strength of the anchor line at no speed for chain cable and0,44 times the breaking strength for wire rope at the first layer on the drum. Nominal load shall be at least0
22、,25 times the breaking strength for chain and0,31 times for wire rope. Maximum values shall be agreed, if necessary, between manufacturer and purchaser. High speed or slack rope speed shall be agreed upon between manufacturer and purchaser in each case.BS7464:1991 2 BSI 01-2000 4.2 Braking 4.2.1 Sta
23、tic braking For each anchor winch, two separate static brake systems, designated first and second below, shall be operable at all times. If a chain or wire rope stopper is installed, the static brake capacity shall be sufficient to maintain at least0,8times for the first system, and0,5times for the
24、second system, the breaking strength of the chain or wire rope, whichever is higher. If a chain or wire rope stopper is not installed, the static brake capacity shall be sufficient to maintain at least1times for the first system, and0,5times for the second system, the breaking strength of the chain
25、or wire rope, whichever is higher. When engaged, the braking systems of the anchor winch shall not be affected by a failure of the normal power supply. If the power supply fails during operation, a residual braking force of at least50% of the static braking capacity given above shall be instantly an
26、d automatically applied. For wire-rope drums with multiple layers, the requirements in4.1 and4.2 shall apply to the first layer. 4.2.2 Dynamic braking for anchor deployment Provision shall be made for necessary braking force capacity during setting of the anchor. 4.3 Emergency release of static brak
27、es It shall be possible to carry out emergency release of the static brakes within15s even when the normal supply fails. This emergency release shall be possible with the vessel inclined up to35 in any direction and with a tension up to the breaking strength of the anchor line. It shall be possible
28、to limit the speed of the released anchor line and to apply and release one of the brakes at least once during the emergency release. 4.4 Operation Operation of the winch shall be in accordance with ISO 7825. When released, the operating handle shall automatically return to the stop position. If not
29、 arranged otherwise, the winch shall be equipped with means to measure tension, length and speed of each anchor line. In addition indicators for clutches, brakes, etc., shall be supplied to ensure safe operation. The speed shall be adjustable to zero or have a special creep speed for precise tension
30、ing or for stowing the anchors. 5 Design and construction Anchor winches shall meet the general requirements for deck equipment in ISO7825, and the specific requirements given in5.1 to5.10. NOTE 3Attention is drawn to the requirements of national administrations and relevant classification societies
31、. 5.1 Chain cable This International Standard is based upon the use of chain cable which shall have dimensions in accordance with ISO1704 and breaking strength to be specified seeclause7 g). 5.2 Wire rope This International Standard is based upon the use of wire ropes which shall conform to ISO2408
32、and ISO8369, having a breaking strength to be specified seeclause7 g). 5.3 Textile rope When textile ropes are used, they should conform to the requirements of the relevant International Standards as closely as possible. 5.4 Warping ends A winch may be specified with or without warping ends; their p
33、rofile shall be in accordance with ISO6482. When warping ends are specified, the purchaser shall state whether the drum is to be declutchable. If only one warping end is specified, its position (right or left) shall also be stated in the order. 5.5 Cable-lifters The cable-lifters shall have at least
34、 five snugs. Thewidth of the groove shall be sufficient for a kentertype joining shackle, but it shall not exceed1,6times the normal chain diameter. 5.6 Wire-rope drums The ratio between the drum core and wire rope diameter shall not be less than15. If the winch is not equipped with a spooling syste
35、m, the drum flanges shall protrude at least1,5times the wire diameter beyond the top layer of wire rope on the drum. The fastening of the wire rope to the drum shall have a strength of about0,25times the breaking strength of the anchor line, unless otherwise agreed by manufacturer and the wire purch
36、aser. Provision shall be made for easy manual removal of the wire rope from the drum.BS7464:1991 BSI 01-2000 3 5.7 Guide sheaves Guide sheaves for chain cable with snugs shall comply with the requirements given for cable-lifters in5.5. Guide sheaves for chain cable without snugs shall be specially c
37、onsidered in each case. Guide sheaves for wire rope shall have a minimum diameter of20times the wire rope diameter. 5.8 Calculations Dynamic effects due to sudden start and stop shall be closely considered when the stresses are determined. For elements subjected to loads with a low number of load cy
38、cles, an analysis of nominal stresses is sufficient to determine the strength. When the number of load cycles exceeds10000, due consideration shall be given to stress concentration factors, the load spectrum, etc., to determine the fatigue stresses. 5.9 Allowable stresses The anchor winch shall be c
39、onstructed in such a way that no stress calculated by simple elastic theory occurs which exceeds0,9times material0,2% proof stress, when subjected to a static load equal to the breaking strength of the anchor line. Stress so calculated in the brake systems or parts being exposed to load during braki
40、ng shall not exceed0,85times the material0,2% proof stress during such loads. When emergency release is effected, the stresses shall not result in permanent deformation in any part. The yield stress shall not be assumed higher than0,8times the minimum breaking strength of the material. Components li
41、able to fatigue shall be designed for at least10 years life. 5.10 Drive equipment 5.10.1 Electrical drives and control equipment shall conform to the requirements of IEC92. 5.10.2 Hydraulic drives and control equipment shall conform to the requirements of ISO4413. Systems nominal pressure shall be s
42、elected from ISO2944. 6 Acceptance tests All winches shall be subjected to the following tests at the workshop or on board: a) function of clutches, brakes, chain or wire rope stoppers, etc.; b) calibration of instruments for tension, length, and speed; c) no-load lost at nominal speed for30min in e
43、ach direction, with checks for leakages, bearing temperature and abnormal noise; d) test of maximum hauling tension. In addition, one winch of each type shall be tested for e) the static brake power of the brakes at a torque equal to the braking capacity as specified in4.2.1; f) residual brake force
44、 as defined in4.2.1; g) holding power of chain or wire rope stopper at a load corresponding to the anchor line breaking strength; h) emergency release at a load corresponding to the anchor line breaking strength. Which tests are to be carried out at the workshop and which on board shall be agreed up
45、on between the manufacturer, purchaser and other parties involved. 7 Designation Anchor winches conforming to this International Standard shall be designated as follows: a) denomination: anchor winch; b) the number of this International Standard: ISO9089; c) type of winch as follows: d) side of winc
46、h according to3.3: e) type of drive: f) diameter of chain cable and/or wire rope or textile rope in millimetres (seeISO1704, ISO2408 and ISO8369); g) breaking strength in kilonewtons; h) length of wire rope (if any) or textile rope (ifany) in kilometres. CU = cable-lifter unit for chain cable, DU =
47、drum unit for rope, TU = twin drum unit for rope, CCWU = unit with a system where it is not necessary to disconnect the chain cable from the rope, DCWU = unit with a system where chain cable and rope can be disconnected; R = right-hand, L = left-hand; E = electric, H = hydraulic, S = steam;BS7464:19
48、91 4 BSI 01-2000 For combined anchor lines, the various line elements shall be described beginning at the anchor (seeexample2), giving their diameter and breaking strength. i) number and, where applicable, position of warping-ends: R or L (see5.4); j) information on motive power: voltage and frequen
49、cy of electric current, or hydraulic fluid pressure and flow rate; k) type of drum connection (add X only if it is declutchable). EXAMPLE 1 Designation of an electric-driven right-hand cable-lifter unit for chain cable of76mm diameter and6130kN breaking force,440V voltage and60Hz frequency: Anchor winch ISO9089 CURE76 6130440/60 EXAMPLE 2 Designation of a hydraulic-driven left-hand unit for a continuous anchor line system consisting of83mm diameter5600kN breaking force chain cable at the anchor end and89mm diameter rope at the other end, of1,5km
