Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Mechanical Engineering Expert

Read the following article.

ASHLAND oil tank failure

The background for the oil storage tank failure is as follows: the tank involved was a four million gallon circular tank which was built in 1940 for Ashland Oil Company in Cleveland, Ohio. Beginning in 1940, the tank was operated for many years in what was believed to have been heated oil service. It is unclear as to how many years the tank was not used, but in 1986 it was disassembled by cutting it apart into sections. Using oxy-acetylene torches the "old welds" were left in place as the tank was cut apart and the sections were moved to an Ashland Oil facility near Pittsburgh, Pennsylvania. Using shielded metal arc welding; tank was reassembled in 1987 and placed in a tank farm with many other similar tanks near the Monongahela River. When reassembled, tank joints were x-rayed and leak tested. Test results indicated that none of the welds need rework. The reassembled tank was 50 feet high and approximately 130 feet in diameter. A dike was built around the tank which will hold 150 percent of the tank capacity.

The tank was partly filled with diesel fuel in August 1987. On January 2, 1988, during its initial filling to capacity after reconstruction, the tank failed catastrophically creating a tidal wave of oil which sent nearly 4,000,000 gallons of diesel fuel into the Monongahela River causing a major environmental problem. The problem was so severe that the whole water supply for all of South Pittsburgh had to be shut down for two weeks. In addition to spilling thousands of gallons of oil in the river, the tidal wave of oil from the tank damaged other nearby tanks and structures as well. "A small, uncemented cinderblock shed about 120 feet distant had its walls literally swept away… leaving its roof lying neatly on the slab floor. "

Answer the following problems:

1. Decide what material composition was most probable used for the tank wall, document the properties of the material and then decide the most probable processing history for the manufacture and construction of the storage tank.  Discuss these issues as the initial paragraph(s) of your report.

2. Compute the probable wall thickness of the tank.

3. If a 3/8” thick plate was used, compute the exact flaw size which caused the brittle failure of the tank.

4. Use your calculations as a basis for a one or two paragraph discussion of the tank failure.

5. By calculation and design assumptions, find out if any of the following materials can be used for this tank, given the (improbable) assumption that all manufacturing and joining problems are solvable for the particular material.
                PMMA
        2024-T4 Aluminum
        Ti-6AL-4V
        Aluminum Oxide
            Glass

Assumptions:

• The tank was 80% full of oil when it failed.

• Suppose that the crack was oriented vertically and ignore stresses in vertical direction.

• Disregard end effects when calculating the stress in the tank wall.

• The oil height above the crack at the time of fracture was 35 ft.

• Suppose a medium carbon steel has a KIC = 49 ksi?in.

Show all calculations.

Mechanical Engineering, Engineering

  • Category:- Mechanical Engineering
  • Reference No.:- M91846

Have any Question? 


Related Questions in Mechanical Engineering

The vibrational partition function for an unknown diatomic

The vibrational partition function for an unknown diatomic molecule at 300 K is 2.33. Find the maximum value of the vibrational constant ve in cm-1 such that at least 5% of the molecules in a 300 K sample will be found i ...

1 a differential manometer is used to measure the pressure

1. A differential manometer is used to measure the pressure change caused by a flow constriction in a piping system as shown. Determine the pressure difference between points A and B in psi. Which section has the higher ...

Write an engineering paper talking about nano-structure gas

Write an engineering paper talking about Nano-structure gas sensors. I have an outline that I need you to follow and Also I provided all the sources you need to write the paper. High performance nano-structured Zinc Oxid ...

1 concrete rocks and bone are strong in compression and are

1. Concrete, rocks, and bone are strong in compression and are usually designed for compressive loading. To test their strength in compression, what sort of test specimen would be useful? 2. Suppose that a downward force ...

1 an equation linking water density and pressure iswhere

1. An equation linking water density and pressure is where the pressure is in atmospheres and B =3000 atm. Determine the pressure in psi required to increase water density by 1% above its nominal value. 2. What pressure ...

Gas turbine engines are mostly seen in aircraft while

Gas turbine engines are mostly seen in aircraft, while piston combustion engines are mostly seen in ground vehicles. Which advantages and disadvantages of these engines have caused them to be favorable for their respecti ...

Derive a formula for the minimum energy in the

Derive a formula for the minimum energy in the two-dimensional Using model, if the interaction energy between each spin and each of its eight nearest neighbors is -D. Assume that the model consists of a rectangular array ...

How is that process-that curve-modified if this is a sheet

How is that process-that curve-modified if this is a sheet metal joint? Do variations in friction between male and female threads affect the torque-turn relationship? Describe the turn-of-nut procedure used in structural ...

Question 1derive an expression for the velocity vector of

Question 1: Derive an expression for the velocity vector of the collar D, N V D. The upper arm (B) rotates about a horizontal axis ( nˆ x ) at a rate q · 1 The lower arm (C) Rotates about the longitudinal axis of B (bˆ z ...

If all the states of an ensemble are equally probable then

If all the states of an ensemble are equally probable, then a 0.05 mol sample of an ideal gas at ixed energy in a 1000 cm3 container has a chance of being found in a state where a speciied 1% region of the volume is not ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro