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Cmaa 70 Free Download - Free PDF eBook
For greater detail consult CMAA specifications #70 and #74 or contact CMAA. Since CMAA member companies have worked together in developing and refining crane specifications and standards to assure proper selection and application of cranes. CMAA member companies have the engineering and design expertise to assist. CMAA Specification for Top Running Bridge and Gantry Type Multiple Girder Electric Overhead Traveling Cranes Specification for Top Running Bridge and Gantry Type Multiple Girder Electric Overhead Traveling Cranes View Abstract Product Details Detail Summary View all details. CMAA Specification 70, first published in , superseded ECOI Since , CMAA Specification 70 has been republished several times with changes and updates managed by CMAA’s Engineering Committee. CMAA Specification 74 was first published in to provide similar design information on single girder cranes.
Cmaa 70 pdf free download
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The first was omitted. The Crane Manufacturer's Association ofAmerica, cmaa 70 pdf free download, loc. These Specifications are offered as guidelineso Ifa user refers to, or otherwise employs, sIl or any partof these Specifications, the user is agreeing to the following terms of indemnity, warranty disclaimer, cmaa 70 pdf free download, and disclaimer of liabilityo The use of these Specifications is permissive, not mandatory.
Voluntary use is within the control and discretion of the user and is not intended to, and does not in any way limit the ingenuity, responsibility or prerogative of individual manufacturers to design or produce electric overhead traveling cranes which do not comply with these Specifications.
CMAA has no legal au1hority to require or enforce compliance with these Specificationso These advisory Specifications provide technical guidelines for the user to specify his application. Following these Specifications does not assure his compliance with applicable federal, state, or local regulations and codeso These Specifications are not binding on any person and do not have the effect of lawo CMAA and MHI do not approve, rafe, or endorse these Specifications.
They do not take any position regarding any patent rights or copyrights which could be asserted with regard to these Specifications and do not undertake to ensure anyone using these Specifications against liability for infringement of any applicable Letters Patent. Maintenance and Crane Operator.
CMM Specification No. It should be understood that the specifications I are general in nature and other specifications may be agreed upon between the purchaser and the manufacturer to suit cmaa 70 pdf free download specific installation.
These speclficatlons do not cover equlpment used to lift, lower, or transpon personnel suspended from the holst rape systern. Washington, D. Pilkey Copyright. For buildings where truss sag becomes a factor, this clearance should be increased. Pipes, conduits, etc. The crane stops fumished by the purchaser are to be designed to suit the specific crane to be installed. The distance, center lf center, and the elevation shall be within the tolerances given in Table 1.
The runway rails ShOll. Floating rails are not recommended. Gantry cmaa 70 pdf free download other types of special cranes may require additional considerations. Flexible conductor systems shall be designed and installed in a manner to minimize the eftects of flexing, cable tension, and abrasion. The ampacities of fixed loads such as heating, lighting, and air conditioning may be computed as 2. Icf '. In addition, capacity label should be marked on the hoist body.
Load on individual hoist or hooks shall not exceed their rated capacity. Structural parts shall be designed according to the appropriate limits as per Chapter of l specification. Mechanical parts shall be designed according to Chapter of this specification.
AII other load carrying parts shall be designed so that the calculated static stress in the material, based on rated crane capacity, shall not exceed 20 percent of the published average ultimate strength of the material. This limitation of stress provides a margin of strength to allow for variations in the properties ofmaterials, manufacturing and operating conditions, and design assumptions, and under no condition should imply authorization or protection for users loading the crane beyond rated capacity, cmaa 70 pdf free download.
Due regard shall be given in the design for operation, accessibility, interchangeability and durability of parts. When feasible, the trolley should be placed on the assembled crane bridge, but cmaa 70 pdf free download is not required to reeve the hoisting rape. If storage is required, arrangements should be made with the manufacturer for extra protection. Detail drawings are normally not fumished.
Before putting the crane cmaa 70 pdf free download operation, the erector of the crane shall assure that all bearings, gears, cmaa 70 pdf free download, etc. The crane service classification is based on the load spectrum reflecting the actual service conditions as closely as possible. Load spectrum is a mean effective foad, which is unifonnly distributed over a probability scale and applied to the equipment at a specified frequency.
The selection of the properly sized crane component to perlorm a given function is detennined by the varying load magnitudes and given load cycles which can be expressed in terms of the mean effective load factor.
Operation with no lifted load and the weight of any attachment must be included. The sum total of the load probabilities P must equal 1. The cranes can be classified into loading groups according to the service conditions ofthe most severely loaded cmaa 70 pdf free download of the crane. The individual parts which are clear1y separate from the rest, or fonning a self contained structural unit, can be classified into different loading groups if the service conditions are fully known.
Capacity loads may be handled for initial installation of equipment and for infrequent maintenance. Loads may vary fro" load to occasional full rated loads with two to five lifts per hour, averaging ten feet per lift. In this type of service the crane will handle loads which average 50 percent of the rated capacity with 5 to 10 lifts per hour, averaging 15 feet, not over 50 percent of the lift at rated capacity. In this type of service, loads approaching 50 percent of the rated capacity will be handled constantly during the working periodo High speeds are desirable for this type of service with 10 to 20 lifts per hour averaging 15 feet, cmaa 70 pdf free download, not over 65 percent of the lifts at rated capacity.
Applications may include magnet, bucket, magnet'bucket combination cranes for scrap yards, cement milis, lumber milis, fertilizer plants, container handling, etc.
Applications may include custom designed specialty cranes essential to performing the critical work tasks affecting the total production facility. These cranes must provide the highest reliability with special attention to ease of maintenance features. TABLE 2. Other suitable materials may be used provided that the parts are proportioned to comparable design factors.
Allowable weld stresses for load combination cases 2 and 3, Sections 3. The manufacturer shall specify the type and the construction to be fumished. The loads acting onthe structure are divided intothree differentcategories. AII of the loads having an influence on engineering strength analysis are regarded as principal loads, namely the dead loads, which are always present; the hoistload, acting during each cycle; and the inertia forces acting during the movements ofcranes, crane componen.
Load effects, such as operating wind loads, skewingforces, snowloads, temperature effect, loads onwalkways, stairways, platforms and handrails areclassed as additionalloads and are onlyconsidered for the general strength analysis and in stabilityanalysis. Other loads such ascollision, out ofservice wind loads, and test loads applied during the load test are regarded as extraordinary loads and except for collision and out of service wind loads are not part of the specification.
Seismic forces are not considered in this design specification. However, if required, accelerations shall be specified at the crane rail elevation by the owner or specifier. The allowable stress levels under this condition of loading shall be agreed upon with the crane manufacturero3. The hoist load factor is 0. The inertia forces during acceleration and deceleration shall be calculated in each case with the trolley in the worst position for the component being analyzed.
The wind load on the trolley shall be considered as equally divided between the two girders. Where multiple cmaa 70 pdf free download are exposed to the wind, such as bridge girders, where the horizontal distance between the surfaces is greaterthan the depth ofthe girder, the wind area shall be considered cmaa 70 pdf free download be 1.
For single surfaces. The horizontal forces shall be obtained by multiplying the verticalIDad exerted on each wheel or bogie by coefficient S'k which depends upon the ratio 01the span to the wheel base. Load suspended from lifting equipment and free oscillating load need not be taken into consideration.
Where the load cannot swing, the bumper cmaa 70 pdf free download shall be calculated in the same manner, taking into account the value of the loado The kinetic energy released on the collision of two cranes with the moving masses of M" M2' and a 40 percent maximum traveling speed 01 VT, and VT2shall be detennined from the l0wing equation: M,M2.
See Section 3.
CMAA 2017 Year in Review
, time: 6:55Cmaa 70 pdf free download
Download CMAA 70 Specification Free in pdf format. Sponsored Ads. Account Login. Register. Search. Search. About Us We believe everything in the internet must be free. So this tool was designed for free download documents from the internet. Legal Notice. Jan 11, · Download Cmaa 70 - book pdf free download link or read online here in PDF. Read online Cmaa 70 - book pdf free download link book now. All books are in clear copy here, and all files are secure so don't worry about it. This site is like a library, you could find million book here by using search box in the header. Download CMAA 70 Specification Free in pdf format. Sponsored Ads. Account Login. Register. Search. Search. About Us We believe everything in the internet must be free. So this tool was designed for free download documents from the internet. Legal Notice.
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