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

Consider the following three types of photoelectric object

Consider the following three types of photoelectric object counters (or object detectors or limit switches): 1. Through (opposed) type 2. Reflective (reflex) type 3. Diffuse (proximity, interceptive) type Classify these ...

Find the location and characteristic impedance of the

Find the location and characteristic impedance of the quarter-wavelength transformer in Example 15.8 if the transformer is connected at the first voltage maximum. EXAMPLE 15.8 A load Z L = 45 - j60 Ω is connected to a li ...

In figure 10-e two examples of a metric vernier micrometer

In Figure 10-E, two examples of a metric vernier micrometer are shown.The micrometer is graduated in hundredths of a millimeter (0.01 mm),and an additional reading in two-thousandths of a millimeter (0.002 mm) is obtaine ...

Nbspa microbrewery was built in 2012 at a total costnbspof

A microbrewery was built in 2012 at a total cost   of $650,000. Additional information is given in the accompanying table (all 2000 indices = 100). Average Percentage of Index Index Cost Element Total Brewery Cost (2012) ...

A explain why mechanical loading error due to tachometer

(a) Explain why mechanical loading error due to tachometer inertia can be significantly higher when measuring transient speeds than when measuring constant speeds. (b) A dc tachometer has an equivalent resistance R a = 2 ...

What are the essential hardware components in a basic

What are the essential hardware components in a basic microcontroller? Using a schematic diagram show the organization of such a basic computer. Explain the acronyms RAM, ROM, PROM, EPROM, and EEPROM (or, EAPROM). What i ...

The energy consumption associated with a home water heater

The energy consumption associated with a home water heater has two components: (i) the energy that must be supplied to bring the temperature of groundwater to the heater storage temperature, as it is introduced to replac ...

Application transmission line resonator a transmission line

Application: Transmission line resonator. A transmission line resonator is made by connecting a 10-pF capacitor across the input of a 75-Ω line and shorting the other end (Figure 14.50). What must be the length of the li ...

Derive an expression for the instantaneous field current

Derive an expression for the instantaneous field current for a three-phase short circuit at the terminals. As in Problem 4, assume that the machine is initially operating with the stator open-circuited and that the speed ...

A darsonval movement is rated 50 ma 1000 omegaa design a

A d'Arsonval movement is rated 50 mA, 1000 Ω. a. Design a 15-V dc voltmeter. Show the circuit and component values. b. What is the ohm/volt rating of the voltmeter?

  • 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

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate