Find the most up-to-date version of BS at Engineering BS Rules For The Design Of Cranes – Part 2: Specification For Classification, Stress Calculations And Design Of Mechanisms. Bs Crane Design – Download as PDF File .pdf), Text File .txt) or read online. Civil Engineering.
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Weapons Domestic and commercial equipment. Search the history of over billion web pages on the Internet. It also provides a framework of reference between the purchaser bbs the manufacturer. Classification of mechanisms 4. The size factor is derived from figure 2. Bolts required to transmit a load be one part of a mechanism to another alternatively, to transmit a load between a mechanism and a part of the crane structure shall comply with the requirements of ; clause 13 of Part 1: Components shall also be 253-2 or selected to give an economic life in terms of durability that can be affected by fatigue, by wear, by temperature and by vibration.
It is important that users of British Standards should ascertain that they are in possession of the latest amendments or editions.
Failure of mechanism components represents a hazard of varying importance and can lead to consequential damage and cost which may be considerable. Group classification of a mechanism 3 5. Classes of utilization of mechanisms 2 4.
The following characteristics shall be determined for each type of fluctuating stress e. Why is it a 2537-2 PDF?
In practical terms this should ensure, for example, that the couplings, shafts, gears, bearings, etc. Where the appliance of which the mechanism is part has known duties, such as would be the case where it performed part of a continuous, repetitive process, the service life shall be calculated from the actual daily utilization time for the mechanism, the number of working days per year and the number of 2753-2 of expected service.
In this connection, consider- ation shall be given to the consequences of failure. Long travel T5 L3 M6 O.
Users of British Standards are responsible for their correct application. Where other steels are used, the crane manufacturer shall show that the properties are comparable with the standard steels and that gs have been subjected to equivalent tests. R 4 Loads due to the weight of the hook load augmented by the impact factor given in 5. Safety Metrology and measurement. Mechanisms and components shall be designed or selected for a particular intended service life and one of the nominal values specified in table 25732- shall be used.
Bolts other than friction grip bolts shall comply with the requirements of BSbut this does not preclude the use of specialized fasteners where appropriate, in accordance with the manufacturer’s recommendations.
Treatment of multiple stress concen- trations in close proximity is outside of the scope of this appendix and where this situation arises reference should be made to established reference works.
Hours per day for gear design Class of utilization Hours per bz for gear design T1 0. Maximum torques in derricking and slewing mechanisms normally occur during conditions of braking, unless a high rate of acceleration is called for. It is an important responsibility of the designer and manufacturer to ensure that torque values are correctly and appropriately quantified so that mechanism will perform as required in the service environment for the 22573-2 life.
Full text of “Safety British Standards”
For some purposes, it is appropriate to allow for dynamic effects by considering a steady condition modified by the use of an impact factor. The use of BS requires a determination of the operating hours per day for a particular crane motion. Their committees work with the manufacturing and service industries, government, businesses and consumers to facilitate the production of British, European and International standards.
Once a PDF file has been bound to a computer, it can be opened only from that computer. In making allowance for runner bearing friction, the ratio between 2537-2 diameter and bearing diameter has to be taken into account, especially when plain bearings are used. Stresses shall not, however, exceed those specified in clause 7. R 3 Loads due to the weight of the hook load.
In either hs, account should be taken of the starting characteristics of the drive unit or the retarding properties of the brake system, as appropriate. Jewellery Road vehicles engineering Railway engineering Shipbuilding and marine structures Aircraft and space vehicle engineering Materials handling equipment Packaging and distribution of goods Textile and leather technology Clothing industry Agriculture Food technology Chemical technology Mining and minerals Petroleum and related technologies Metallurgy Wood technology Glass and ceramics industries Rubber and plastic industries Paper technology Paint and colour industries Construction materials and building Civil engineering Military affairs.
In calculating the torque applied to a mechanism or component during an accelerating or decelerating motion, it may be necessary to take into account the torques required to accelerate or decelerate the moving parts of the mechanism and drive unit themselves. In particular, a wind force that opposes a motion can significantly reduce the acceleration, with consequent reduction of the acceleration force.
Free to use BIM project management tool provides step-by-step help to define, manage and validate responsibility for information development and delivery at each stage of the asset life cycle in level 2 25732 projects. Design and selection shall have regard to the potentially serious consequences of failure.
Bearing pedestals and mountings shall be capable of transmitting the load from the bearing to the supporting structure, suitable provision being made for cases where the resultant load is not acting as bw compression load on a bedplate. It should be noted that this will not necessarily correspond to the combination of the maximum values of each of the individual loads. Two such works are: The faster, easier way to work with standards.
The use of suitable cast 5273-2 with adequate surface hardness is not excluded for rail wheels, but it should be remembered that some such materials are brittle and should not be used where shock loading may occur. Load actions incorporating corrigenda March and November Braking often produces higher torques than conditions of acceleration. Gs is the total number of hours for which the mechanism will be in motion.
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Limiting bearing stress, P L 9 7. Please download Chrome or Firefox or view our browser tips. The committee found its scope limited in certain areas where the revision of some British Standards has been held back in order to take advantage bbs work which be being carried out in ISO.
The Amber document status indicator indicates vs some caution is needed when using this document – it is either: