Reference no: EM131312924 , Length: word count:1000
Equipment Engineering and Design Structural Failure Problem-
Background -
A 6 ton pressure vessel - see dimensioned drawing - was being lowered onto a "stillage"or temporary supporting structure for testing outside a factory in the open yard. The lower lugs were attached to the stillage and as the slings were being loosened by the crane operator, the vessel tilted slightly.
At this point one of the legs of the stillage collapsed. Luckily the slings had not been removed, so the vessel did not fall - but a serious accident was only narrowly averted.
It was subsequently noticed that the ground on which the vessel and stillage were being placed sloped at 5 degrees.
Problem -
1. Why did the leg collapse? What effects or details did the designer ignore?
2. Redesign the stillage to avoid similar incidents in future, without increasing its footprint (width, length) since space is needed around it for testing.
3. Make recommendations on safe lifting and mechanical handling of the vessel.
Tips: work out the weight and the centre of gravity of the vessel. Check the load on each leg. Estimate the collapse load using a suitable formula and relevant assumptions.
Also look up the rules for similar mechanical handling procedures
Vessel details -
Wall thickness 12mm. Hemispherical ends. Carbon steel.
Overall length 7.2m, diameter 2.4m
3 Nozzles (all on vessel centre line), pipe o/d 500mm, i/d 420mm, 500mm long.
Nozzle flanges, o/d 600mm, i/d 420mm, thickness 22mm
Stillage details -
Section: 50 x 50 x 5 mm rolled steel angle. Welded construction. S275 steel (i.e. yield stress of 275 MPa).
Section Properties: overall width 2m, length 4.4m, height 2.4m.
Reminder of the Euler critical loads Pc which are valid for slenderness ratio l/k > 80. What are the actual end conditions here?
The calculation aspect should be on the appendix but will be referenced on the main body of the work.
|
Immediately speed up the project
: Your project is executed with a globally spread virtual team. The project progress has been found to be too slow. Which measure is most likely to immediately speed up the project? Answer in 4-5 sentences.
|
|
Estimate how much you need to increase the planform area
: Estimate how much you need to increase the planform area of the horizontal stabilizer to maintain the same static margin in pitch. Assume for simplicity no change in the cg location.
|
|
Proposals according to a standard format
: Why would a customer give contractors instructions in the RFP to submit their proposals according to a standard format?
|
|
What would be the complexity if the list were sorted
: Given an unsorted list of n values, what is the time-complexity to find the kth smallest value in the worst case? What would be the complexity if the list were sorted?
|
|
What effects or details did the designer ignore
: 55 - 7947 Equipment Engineering and Design Structural Failure Problem. A 6 ton pressure vessel - see dimensioned drawing - was being lowered onto a "stillage"or temporary supporting structure for testing outside a factory in the open yard. Why did ..
|
|
Proprietorship or partnership to become a corporation
: What do you give up as an owner of a proprietorship or partnership to become a corporation? What does it mean to you as an owner to have limited or unlimited liability? How does a corporation differ when a stockholder or manager dies compared to when..
|
|
Create a 4 period moving average forecast
: Create a 4-period moving average forecast, an exponential smoothing forecast with alpha=0.2, and a linear trend forecast for your data.
|
|
Think about a specific healthcare organization
: Think about a specific healthcare organization: Are there any differences for creating an effective delivery system? Who are the important stakeholders in a healthcare delivery system?
|
|
What will stock price be in three years
: The Jackson–Timberlake Wardrobe Co. just paid a dividend of $1.65 per share on its stock. The dividends are expected to grow at a constant rate of 5 percent per year indefinitely. Investors require a return of 12 percent on the company's stock. What ..
|