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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In the absence of such information regarding the duty of the appliance, ah assumed daily utilization time shall be used. Rules for the design of cranes.
Because cranes lift and transport heavy loads, there is a major safety aspect in their vs which has, to some extent, to be related to the level of design stresses permitted. Amendment C1 dated November – See foreword.
Case 2 Normal service with wind. The qualities of metal refer to cast, forged or rolled steels and spheroidal graphite cast iron. The minimum breaking load of a rope intended for a particular duty shall be determined from: In the case of proprietary slewing rings, it is particularly important that the manufacturer is consulted 2753-2 given full details of the loads and duty involved.
For ductile materials the value of q may be obtained bw published reference works or from experimental data. 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 intended life.
Typical classification of crane mechanism 11 B. Table 6 gives the minimum coefficient of utilization, Z pfor each mechanism group. Bw general phenomenon is denoted ‘notch sensitivity’.
Revision of British Standards. Your basket is 5273-2. These loads include those due to the inertia of the mechanism itself, its prime mover, brakes, the associated crane parts, the hook load, the concurrent operation of other motions, etc. Loads due to the dead weight of the mechanism or component. R 3 Loads due to the weight of the hook load. When considering durability, the loading combinations appropriate to normal operating conditions shall be considered.
Such cases are not, however, relevant for fatigue verifications. The rules included for determining rail wheel sizes have been based on F. For purpose-built cranes, the selection of an appropriate nominal state of loading for each mechanism may be agreed between the purchaser and manufacturer.
In addition, the requirements for stiffness lateral and torsionalfatigue, influence of bearings, fits of components, etc.
Derating of hooks Table showing selected sizes of point hooks, as listed in table 1 of BS Capacities are rounded off in line with R10 series.
Torques applied to the components of crane mechanisms arise from the interaction of prime movers or brakes with gravitational loads, the inertias of various masses and rotating parts, and with combinations of both.
Scope This Part of BS provides the basis for calculating stresses in components of crane mechanisms and specifies the way in which permissible stresses shall be determined, it also gives rules for the selection of proprietary items where these are used as mechanism components. Where a component is subjected to a combination of co-existent stresses, F c is the combined stress which shall 2573- calculated as follows: Components shall also be designed or selected to give an economic life in terms of durability that can be affected by fatigue, by wear, by temperature and by vibration.
The committee found its scope limited in certain areas 2573-22 the revision of some British Standards has been held back in order to take advantage of work which is being carried out in ISO. Derating of hooks table 1 of BS Suitable surface roughness values for stressed portions of shafts shall be selected having regard to size, stress levels, severity of stress raising features and be needs of bearings, bd, etc.
Selection of components 8. The determination of the maximum tensile force, S, in the various ropes which do not exclusively serve in the vertical hoisting of the load 22573-2 be based on the loads determined from the loading conditions specified in 5.
Reproduction and Redistribution Restricted: Since printing a part will be considers as one print, we recommend you print the entire document. Further factors relating to specific mechanisms of a crane are discussed in B. The selection procedure adopted assumes that the ropes are lubricated correctly, that the winding diameters on the pulleys and the drums are selected in accordance with 8. Vi Loads due to the service wind acting horizontally in any direction, where applicable.
U s is the ultimate tensile strength of the material. Classes of utilization of mechanisms 2 4.
Full text of “Safety British Standards”
B difficult decision had to be taken on the method of classification to adopt because the needs of specially designed cranes and series built standard cranes were to some extent in conflict. Bolts required to transmit a load from 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: They shall also, when appropriate, be checked against fatigue.
Worldwide Standards We can source any standard from anywhere in the bss. The assumed rates of acceleration and deceleration should be consistent with the crane type, application and duty, and should also be compatible with the rating of the drive unit.
Coefficient, c 2for rail wheels 10 7. Standard Number BS It applies to ropes complying with the requirements of ISO ; it does not exclude, however, ropes that are not specified in ISO It shall be determined from test data, service experience, or by calculation.
Permissible stress, P cfor mechanism mechanisms 3 components 5 5. Load actions incorporating corrigendum March Attention is drawn to the need for special care in connection with weld processes and any heat treatment in mechanical components, and in determining stress levels to which welded joints may be subjected.
This appendix outlines a method of determining the fatigue reference stress for a component detail. 2573–2 a static rope is not clearly associated with a particular mechanism, the minimum coefficient of utilization, Z pshall be taken as that corresponding to the hoist mechanism of the appliance.
However, crane gearing can be designed or selected on the basis of other recognized standards or codes which have been proved satisfactory in crane service. It should be noted that this will not necessarily correspond to the combination of the maximum values of each of the individual loads.