1/6/2015 Center of Gravity (COG) Shift load COG | Offshore.VN | Forum Engineers Coastal Engineering

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250413, 10:04 AM

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May 2012483231

Center of Gravity (COG) Shift load COG

Shift COGCenter of Gravity (COG) is a load of the most important problems in reservice (marineconstruction, including: lifing, loadout ...). To help AE understand this kind of load , topic provides information ae some basic knowledge ofthe authors, if there is something wrong look forward to the addition of ACE, as follows: 1 / In the process of lifting and loadout, the COG structure will no longer determine the initialposition (COG can get from Weight Control Report, or Sacs), which will deviate a paragraph in anumber of problems have to do, is often taken by segment deviation 1m (chi details see attachedpicture) compared to the initial position 2 / When structural analysis software Sacs, Because SACS can only solve the problem in aspecific location that does not describe the whole process of lifting as translation The transfer orthe texture. To describe realistically, staff design must include COG deviation clearance a couple of differentdimensions (torque pair will create a structural shift torque) Sacs in software called load shiftCOG 3 / summary is in fact COG construction cranes shifted during installation is correct and thedesign problem of lifting the designer must mention this case shift How to Tell? With Sacs analysis, it is the shift torque pair COG COG shift assumption about each point padeye 1m pair will calculate the torque, which creates movement.Figure 1: Surface, the calculated parameters COG shift Figure 2: View 3D lifting, torque caused

Entering COG shift (shift the focus) in Sacs.

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1/6/2015 Center of Gravity (COG) Shift load COG | Offshore.VN | Forum Engineers Coastal Engineering

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1/6/2015 Center of Gravity (COG) Shift load COG | Offshore.VN | Forum Engineers Coastal Engineering

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In DNV you see the doctor Rule academic guidance that instead of COG shift load calculation isreplaced by a factor of about 1:05 or more for volume is ok (as quoted photos page 16. Chapter3). Well, that turned out to calculate lifting idle too, just like factor in it without you consider COGshift load for a headache? Physicians and doctors have advised hoangtu add anything? have fun

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The doctor fried to all parties to this rồi http://offshorevn.com/showthread.php?447Dieukien

biencuabaitoanLiftingtrongSacs http://offshorevn.com/showthread.php...ingTrongSacs

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Really what you do for this shift COG machinery under very carefully, but also do notunderstand. The problem is that currently you do jobrelated analysis Lifting and met a guy atParkson Worley insisted it not be calculated in the same COG shift load are "coefficient of 1.1 tomention the inaccuracy of the heart" (brother of the father's words verbatim translation thereof). In the second topic that doctors Bigcrab mention you saw enthusiastic discussion but undecided. The question is when to shift load calculation COG? Physicians do have some information aboutthis item, only for me to.

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The document, complete the normative standards that then, the controversial doctor and boring,so the doctor is important in this case how? Having accepted the plan of the guy in WP are notdoctors? CA's party and their uncle is your opinion on this matter does not?

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Originally Posted by ADATA

Really what you do for this shift COG machinery under very carefully, but also do not understand.The problem is that currently you do jobrelated analysis Lifting and met a guy at Parkson Worleyinsisted it not be calculated in the same COG shift load are "coefficient of 1.1 to mention theinaccuracy of the heart" (brother of the father's words verbatim translation thereof). In the second topic that doctors Bigcrab mention you saw enthusiastic discussion but undecided. The question is when to shift load calculation COG? Physicians do have some information about thisitem, only for me to.

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1/6/2015 Center of Gravity (COG) Shift load COG | Offshore.VN | Forum Engineers Coastal Engineering

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Em, I still require COG shift load, because under Rule says DNV is replaced by a coefficient of1:05 or more, knowing how much? Is greater than 1.1 but 1.9 is greater than 1:05 1:05! But alsofrom DNV rules that can be understood as a certain extent can be accepted in lieu COG shift loadfactor by weight. And for understanding the problem COG shift should also concave pump newplayers thanks to the doctors here just to help. P / S: Job you are doing the construction phase and installation, and the document is Liftinganalysis of contractor installation of marine (sea installation contractors hired him as WP report /analysis). And if you say YES a release, the marine installation contractor carrying out liftingcrane pulled through the blistering CA. not have fun

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Originally Posted by BigCrab

The document, complete the normative standards that then, the controversial doctor and boring, sothe doctor is important in this case how? Having accepted the plan of the guy in WP are not doctors?CA's party and their uncle is your opinion on this matter does not?

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Thus the problem of COG shift finished. Switch to the problem of selection based on internal resources sling calculated from analysissoftware Sacs or equivalent AE thinking when used in a code hoisting sling 04, for reasons that the contractor's proposed useof capacity at 04 different sling, type .... For example: 1 / vertical force analysis in sling 1 is 70MT, 70MT choose Sling there is capacity at 2 / vertical force analysis in sling 2 is 80MT, 80MT choose Sling with capacity at the 3 / vertical force analysis of the sling 3 is 50MT, 60MT choose Sling with capacity at the 4 / vertical force analysis in sling 4 is 90MT, select Sling there is capacity at 100MT

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1/6/2015 Center of Gravity (COG) Shift load COG | Offshore.VN | Forum Engineers Coastal Engineering

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In principle, it can be ok, however it was noted with the layout sling, although the same length but different diameterssling ==> Length crane sling on various dental code , for example, in the diagram by 3D cad software or illustrations without careful ae leave us aline length of each line, when the reality will lag of a few mm, whereas the work of the sling anddifficult to achieve.

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Originally Posted by hoangtu

AE thinking when used in a code hoisting sling 04, for any reason that the contractor's proposed useof capacity at 04 different sling, type .... For example: 1 / vertical force analysis in sling 1 is 70MT, 70MT choose Sling there is capacity at 2 / vertical force analysis in sling 2 is 80MT, 80MT choose Sling with capacity at the 3 / vertical force analysis in sling 3 is 50MT, 60MT choose Sling with capacity at the 4 / Resources longitudinal analysis of the sling 4 is 90MT, select Sling with 100MT capacity at the

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Collect a lot of AE comment in the topic on facebook: Long Nguyen Tu : As you know, this focusshift caused by its initial design parameters without the kind of equipment that is onlyapproximate volume load of device types to model the problem. Avoid the latter case back to themodel, people shift the focus by shifting the focus of 2mx2m square edge. The latter compareswith WCR if structural focus in this square is not to run the texture too. Tuan Luu I think you area bit confused here: 1 / As you wrote above, I understand that when lifting the two mismatcheshook 1m (case 2 crane hooks) or wire cable design error is 1m (1 case crane hook), and theloadout, the displacement of the knee is 1m. With cases like this will have a serious accidentduring the construction of tomorrow we'll be on the front page of all the newspapersimmediately. 2 / I know roughly like this: the focus of structural is fixed (when taken at theorigin of the structure), weightlifting of material must be constant. In the structural software wecan not describe all the components of the structure (especially topside) so there is uncertaintyabout the focus of the structural weight. The focus may actually be located somewhere aroundthe core theory (by our count) so to compensate for this bias is said to COG shift. 1m or 2mlonger shift, square or round shape is prescribed. When additional load COG shift must be basedon the principle does not change the actual weight of structures should we put on the pair oftorque, torque value pairs is how much depends on how many meters and COG shift the weightof the structure is much 3 / actual design T & I, the COG Shift calculated for lifting and lunchingalone, and loadout will take the case "loss of support" (with few investors require COG shift) NgoVan Win : COG landmark in the WCR is so obvious to calculate more accurate SACS. Need onestep prior to putting COG shift from computation of the COG of WCR SACS, then shift COG COGangle of about 4 WCR. Not square 2x2m which is usually 5% of the width and length structure.Most 1x1m degree, in some cases in WCR, the DE has shown COG shift box available then. Onlyafter Weighing case is seen running out of the box COG COG shift WCR calculations by hand, butthe case This is very rare. Right Thanh Tran Thank admin on articles. Actually COG veryimportant in the preservice problem, especially lifting, loadout, transportation. The accuracy ofthe location of the COG and directly influence the outcome of the problem. COG position isusually determined through calculations (via wcr or SACS software model, bocad, ...), but thiswill not determine how truthful, due to changes in the course of construction or add other detailsrequired by the OIC as scaffolding, change arrangment sling ..... so to cover all the changes thatneed to be considered to COG shift. The COG shift envelope retrieved star depends on the sizeand the ability to change the cog texture but not necessarily 2x2. For example Boatlanding lift theCOG shift 2x2 3x10 m which is not reasonable to listen too. Dad Vu Hoang COG is always acertain position. Shift COG to calculate because we can not find the absolute position accuracy ofthe COG. For safety cases should be calculated using COG Shift. And radius depends Shift BaseDesign.

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