Center of Gravity (COG) - Shift Load COG _ Offshore

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#1

10:04 AM

hoangtu Members

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Center of Gravity (COG) - Shift load COG Shift COG Center of Gravity Center Gravity (COG) (COG) is a load of the most important problems in re-service (marine construction, including: lifing, loadout ...). To help AE understand this kind of load , topic provides information ae some basic knowledge of the authors, if there is something wrong look forward to the addition of ACE, as follows: 1 / In the process of lifting and load-out, the COG structure will no longer determine the initial position (COG can get from Weight Control Report, or Sacs), which will deviate a paragraph in a number of problems have to do, is often taken by segment deviation 1m (chi details see attached picture) compared to the initial position 2 / When structural analysis software Sacs, Because SACS can only solve the problem in a specific location that does not d escrib escribe e th the e whole pro rocess cess of lifting as translation The transfer or the texture. To describe realistically, staff design must include COG deviation clearance a couple of different dimensions (torque pair will create a structural shift torque) Sacs in software - called load shift COG 3 / summary is in fact COG construction cranes shifted during installation is correct and the design 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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Cen Center ter of Gravit Gravityy (COG) (COG) - Shift ift loa load COG COG | Offs Offsh hore.V re.VN N | Foru Forum m Engine ineers Coa Coasta stal Engine ineering ring

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Quantitative Risk Assessment to calculate the ... ground bearing arrangement in construction ... Displacement button Load factor combinations the doctor for you please document Calculation & ... the document you would like to share design calculations ... The difference between SWL (Safety Working Load) ... Usage of COG deviation is large when lifting Create combinations of computational load variation ... Fatigue jackup Rigs Last edited by hoangtu; 25-04-13 at 10:10 AM

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04-11-13,

#2

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Cen Center ter of Gravit Gravityy (COG) (COG) - Shift ift loa load COG COG | Offs Offsh hore.V re.VN N | Foru Forum m Engine ineers Coa Coasta stal Engine ineering ring

In DNV you see the doctor Rule academic guidance that instead of COG shift load calculation is replaced by a factor of about 1:05 or more for volume is ok (as quoted photos page 16. Chapter 3). Well, that turned out to calculate lifting idle too, just like factor in it without you consider COG shift load for a headache? Physicians and doctors have advised hoangtu add anything? have fun

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04-11-13,

#3

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The doctor fried to all parties to this rồi http://offshorevn.com/showthread.php?447-Dieu-kienbien-cua-bai-toan-Lifting-trong-Sacs http://offshorevn.com/showthread.php...ing-Trong-Sacs

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04-11-13,

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Cen Center ter of Gravit Gravityy (COG) (COG) - Shift ift loa load COG COG | Offs Offsh hore.V re.VN N | Foru Forum m Engine ineers Coa Coasta stal Engine ineering ring Originally Posted by BigCrab

The doctor then fried to post this party http://offshorevn.com/showt http ://offshorevn.com/showthread.php...ing hread.php...ing-trong-Sacs -trong-Sacs http://offshorevn.com/showt http ://offshorevn.com/showthread.php...ing hread.php...ing-Trong-Sacs -Trong-Sacs

Really what you do for this shift COG machinery under very carefully, but also do not understand. The problem is that currently you do job-related analysis Lifting and met a guy at Parkson Worley insisted it not be calculated in the same COG shift load are "coefficient of 1.1 to mention 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 about this item, only for me to.


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05-11-13,

#5

05:25 AM

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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 job-related analysis Lifting and met a guy at Parkson Worley insisted it not be calculated in the same COG shift load are "coefficient of 1.1 to mention 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 about this item, only for me to.

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 not doctors? CA's party and their uncle is your opinion on this matter does not?

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Cen Center ter of Gravit Gravityy (COG) (COG) - Shift ift loa load COG COG | Offs Offsh hore.V re.VN N | Foru Forum m Engine ineers Coa Coasta stal Engine ineering ring Originally Posted by BigCrab

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 not doctors? CA's party and their uncle is your opinion on this matter does not?

Em, I still require COG shift load, because under Rule says DNV is replaced by a coefficient of 1:05 or more, knowing how much? Is greater than 1.1 but 1.9 is greater than 1:05 1:05! But also from DNV rules that can be understood as a certain extent can be accepted in lieu COG shift load factor by weight. And for understanding the problem COG shift should also concave pump new players thanks to the doctors here just to help. P / S: Job you are doing the construction phase and installation, and the document is Lifting analysis 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 lifting crane pulled through the blistering CA. not have fun


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25-11-13,

#7

11:54 PM


hoangtu Members

Thus the problem of COG shift finished. Switch to the problem of selection based on internal resources sling calculated from analysis software Sacs or equivalent AE thinking when used in a code hoisting sling 04, for reasons that the contractor's proposed use of 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 Practice Pract ice the the firm politic politic

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26-11-13,

#8

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Cen Center ter of Gravit Gravityy (COG) (COG) - Shift ift loa load COG COG | Offs Offsh hore.V re.VN N | Foru Forum m Engine ineers Coa Coasta stal Engine ineering ring Originally Posted by hoangtu

AE think thinking ing w hen used in a code hoisting sling 04, for any re ason that the contractor's proposed use of 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

In principle, it can be ok, however it was noted with the layout sling, although the same length but different diameters sling ==> Length crane sling on various dental code , for example, in the diagram by 3D cad software or illustrations without careful ae leave us a line length of each line, when the reality will lag of a few mm, whereas the work of the sling and difficult to achieve. If tomorrow never come sẽ

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30-03-14,

#9

01:29 AM


hoangtu Members

Collect a lot of AE comment in the topic on facebook: Long Nguyen Tu : As you know, this focus shift caused by its initial design parameters without the kind of equipment that is only approximate volume load of device types to model the problem. Avoid the latter case back to the model, people shift the focus by shifting the focus of 2mx2m square edge. The latter compares with WCR if structural focus in this square is not to run the texture too. Tuan Luu I think you are a bit confused here: 1 / As you wrote above, I understand that when lifting the two mismatches hook 1m (case 2 crane hooks) or wire cable design error is 1m (1 case crane hook), and the load-out, the displacement of the knee is 1m. With cases like this will have a serious accident during the construction of tomorrow we'll be on the front page of all the newspapers immediately. 2 / I know roughly like this: the focus of structural is fixed (when taken at the origin of the structure), weight-lifting of material must be constant. In the structural software we can not describe all the components of the structure (especially topside) so there is uncertainty about the focus of the structural weight. The focus may actually be located somewhere around the core theory (by our count) so to compensate for this bias is said to COG shift. 1m or 2m longer shift, square or round shape is prescribed. When additional load COG shift must be based on the principle does not change the actual weight of structures should we put on the pair of torque, torque value pairs is how much depends on how many meters and COG shift the weight of the structure is much 3 / actual design T & I, the COG Shift calculated for lifting and lunching alone, and loadout will take the case "loss of support" (with few investors require COG shift) Ngo Van Win : COG landmark in the WCR is so obvious to calculate more accurate SACS. Need one step prior to putting COG shift from computation of the COG of WCR SACS, then shift COG COG angle 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. Only after Weighing case is seen running out of the box COG COG shift WCR calculations by hand, but the case This is very rare. Right Thanh Tran Thank admin on articles. Actually COG very important in the pre-service problem, especially lifting, loadout, transportation. The accuracy of the location of the COG and directly influence the outcome of the problem. COG position is usually determined through calculations (via wcr or SACS software model, bocad, ...), but this will not determine how truthful, due to changes in the course of construction or add other details required by the OIC as scaffolding, change arrangment sling ..... so to cover all the changes that need to be considered to COG shift. The COG shift envelope retrieved star depends on the size and the ability to change the cog texture but not necessarily 2x2. For example Boatlanding lift the COG shift 2x2 3x10 m which is not reasonable to listen too. Dad Vu Hoang COG is always a certain position. Shift COG to calculate because we can not find the absolute position accuracy of the COG. For safety cases should be calculated using COG Shift. And radius depends Shift Base Design.

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