Jam shid khan

CECOS UniversityDepartment of Mechanical Engineering 1

Monitoring Bending and Buckling of Long Pipelines Through Strain Gauges

4th FYP PresentationME-2011

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Group Members• Jamshid Khan (GL)• Asad Jahangir• Hafeez Ullah• Faisal Ziyad

Advisor• Dr. Naseer Ahmed

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Contents• Introduction• Aim• Objectives • Fabrication Work• Material Used • Types of Process• Sub Assemblies • General Assemblies • Finishing

• Conclusion

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Introduction• Pipeline system are widely used for distribution and transportation of

petroleum, natural gas, water and sewage. • During their service life, the pipelines face many threats such as bending

and buckling. • These damages occurs due to Temperature change Internal pressure Ground movement.

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Aim

• Monitoring of long pipes through strain gauges

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Objectives • To find the life time of pipes • To rapidly detect damages in pipes • To secure humans life due to the damage or leakage of gas in pipes • To save power by using wireless network to detect specific leakage point

in real time. • To reduce pipeline rupture in short interval of times by signal networks.

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Fabrication Work

• In Fabrication work, the team construct by combining or assembling diverse, 

typically standardized parts• In this project the fabrication involves Supporting frame Pipe supporter Strain gauges installation

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Material used

• Material used in frame manufacturing are aluminum.

• The whole weight of frame is 12.6 kg.

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Pipe material

• We have selected PVC material for pipe.• Its length is 5 ft.• Diameter is 40 mm.• Life time is 30 years.

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PVC Pipe Physical properties

Water absorption increase % 0.05

Coefficient of Linear Expansion (in/in/°F) 2.9 x 10-5

Material Becomes Viscous 350°F

Maximum Service Temp. 140°F

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Aluminum Properties for Frame

Melting Point (°C) 660.2

Boiling Point (°C) 2480Co-Efficient of Linear Expansion (0-100°C) (x10-6/°C)

23.

Modulus of Elasticity (GPa) 68.3

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Supporter Material

Material Cast iron

Tensile strength 250 Mpa

Fatigue Resistance 110 MPa

Yield Strength (0.2%) 160 MPa

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Types of process

• Arc welding • Fastener • Strain gauges installation

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Strain Gauges Installation • Strain gauge grid are made alloys of copper and

nickel.• It can find unidirectional strain.

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Continue…• Strain gauges are the device used to measure the

strain in an object.• The gauges are attached to an object by suitable

adhesive.• The resistance changes is commonly measured by

using wheat Stonebridge.

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Continue..

• Bond strain gauge to measuring site

• Drop of the adhesive, put the strain gauge on the

measuring site while lining up the center marks

• Press strain gauge

• Cover the strain gauge with the accessory

polyethylene sheet and press it over the sheet

with a thumb.

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Continue…

• Complete bonding work• Remove the polyethylene sheet and make

sure the strain gauge is securely bonded.

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Continue..

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NDT ?

• Method of finding defects in an object without harming the object.

• If pipe had to be cut into pieces to be examined. It would destroy their usefulness.

• Here in NDT, defects may be find before they become dangerous.

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NDT Assessment

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Software Assessment

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Graphic indication of nodes

• In graph there are two type of value Positive Value Negative Value • In some areas the positive/Negative value gives

indication about tension and compression of pipe.• The Positive/Negative value deliver by the system are

per second.

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Continue..• This line show the disruption (Tension).• Here the applied force is not uniform but variable

with time.• If we restore its position, the value remain

constant.

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Continue….

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Continue..

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Continue…Vo

ltage

Time (Sec)

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Sub Assemblies

•Frame•Supporter•Central processing unit for analog data•Strain Gauge •Out put data on screen in form of graphics

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Frame ParameterLength 42 in

Weight 12.6 Kg

height 32 in

Weight Bear 90 kg

Material used Aluminum 3031

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Supporter

Length 4 in

Height 1 ft.

Weight 2 kg

Thickness 3 mm

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Central Processing Unit

• In CPU the Data are collected in the form of analog.

• The analog data are converted into digital.• The data are process to over come noise and get

free-error data.• Each terminal of Strain gauge are connected to +in

–in.

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Strain gauge• We will installed one strain gauge at center

position.• Position of strain gauge. • Strain Gauge parallel to the axis.

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General Assembliesframe

System

Pipe

Supporter

Data Acquistion

Strain Gauge

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Thank You

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Any Question ?