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DISCUSS THE FAILURE MODES AND MECHANISM IN CAST IRON WATER PIPE

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DISCUSS THE FAILURE MODES AND MECHANISM IN CAST IRON WATER PIPE

Q1: Discuss the failure modes and mechanism in cast iron water pipe


Q2: Discus the type of corrosion observed in cast iron pipe and its effect on the pipe performance. Also discuss the ways to incorporate the corrosion type in to the structural analysis of buried pipes.  


Q3: Discuss the effect expansive soils and climate changes on the performance of buried pipes  


Q4: Discuss the application of Schlick’s failure criterion in condition assessment of rigid pipes  

 
Q5: An Australian Water Utility decided to assess the safety of a 400 mm diameter cast iron pipe buried under a very busy road. The following details were collected from the inspection in January 2014:

                                          Parameter

              Value

Pipe mean diameter (mm)

                            400

Pipe wall thickness (mm)

                              20

Burial depth (mm)

                            800

Maximum wheel load (kN)

                              30

Operating pressure (kPa)

                            400

Unit weight of soil (kN/m3)

                              20

Ultimate tensile strength of the pipe material (MPa)

                            100



  1. Estimate the maximum pipe stress and factor of safety based on stress according to present operating conditions

  2. a) assuming no soil lateral support 
  3. b) assuming the soil lateral earth pressure coefficient of 0.4

  4. It is expected that the traffic conditions in the road and the operating pressure will change according to the following data

         Year

Maximum likelihood  

      wheel load (kN)

Maximum likelihood operating

            pressure    (kPa)

            2015

                  30

                  450

            2016

                  32

                  520

            2017

                  37

                  520

            2018

                  45

                  550

            2019

                  50

                  575

            2020

                  70

                  600



Q6: A 300 mm diameter and 8km long AC main (30 years old) was inspected in May 2013. During inspection, core samples were collected from the pipe to determine the residual strength. It was found that the average residual strength is around 18 MPa. Also, the degradation rate was computed from the samples and given in the table below.

         Sample No

     Degradation rate   

          (MPa/year)

1

0.62

2

0.40

3

0.49

4

0.49

5

0.53

6

0.57

7

0.54

8

0.52

9

0.53

10

0.48

 



Further, following information was collected as a part of the inspection    

                   Parameter

Value

Pipe mean diameter (mm)

300

Pipe wall thickness (mm)

20

Burial depth (mm)

2000

Maximum traffic load pressure at the pipe level (kPa)

25

Operating pressure (kPa)

600

Unit weight of soil (kN/m3)

18


Estimate the mean and standard deviation in the predicted lifetime on the basis of the Schlick’s failure criterion. State all the assumptions


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  • Title: DISCUSS THE FAILURE MODES AND MECHANISM IN CAST IRON WATER PIPE
  • Price: £ 109
  • Post Date: 2018-11-09T11:02:39+00:00
  • Category: Assignment
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