Ut testing add04 q&a part calculations

Addendum-04 Questions & Answers on Calculations

My ASNT Level III UT Study Notes 2014-June.

Expert at Works

Content: Exercise 1 Exercise 2

Expert at Works too!

Content: Exercise 1 Exercise 2

Expert at Works – The real achiever!

Questions & Answers

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Practices Make Perfect

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2.0: Ultrasound Formula

http://www.ndt-ed.org/GeneralResources/Calculator/calculator.htm

Ultrasonic Formula

Ultrasonic Formula

Inverse Law and Inverse Square Law For a small reflector where the size of reflector is smaller than the beam width, the echoes intensity from the same reflector varies inversely to the square of the distance.

5cm

75% FSH

7.5cm

33% FSH

Inverse Square Law

http://www.cyberphysics.co.uk/general_pages/inverse_square/inverse_square.htm

Inverse Law: For large reflector, reflector greater than the beam width, e.g. backwall echoes from the same reflector at different depth; the reflected signal amplitude varies inversely with the distance.

10cm

7.5cm

Echo Amplitude- Reflector Size “D” & Depth “d” Relations: (small reflector- Inverse square law)

Amplitude α D2 Amplitude α 1/d2 Amplitude = kD2/d2 , k =constant Amplitude1/ Amplitude2 = D12 d22 / d12 D22

d

Amplitude D

Echo Amplitude- Reflector Size “D” & Depth “d” Relations: (large reflector- inverse law)

Amplitude α 1/d Amplitude = k/d , k =constant, Amplitude1/ Amplitude2 = d2 / d1

d

Amplitude D

Scanning Speed: Scanner speed = (PRR / Number of hits) × Effective diameter of probe Speed of test part = (PRR / Number of hits) × Effective diameter of probe Where: Effective dia. of probe = Dia. of probe – 2 [ (Dia. of probe) × (Percent of overlap between scan / 100) ] PRR = Pulse Repetition Rate Linear speed of disc or pipe in mm/ s = (2πr x RPM / 60) where r = radius of disc or pipe in mm RPM = Number of Rotation of pipe Per Minute = Revolution Per Minute