ULTRASONIC TESTING OF WELDS ABC OF THERMAL POWER STATION

Ultrasonic Testing of welds 

Ultrasonic Testing (UT) is also a very popular type of Non Destructive Examination

for welds to find out the irregularities .Generally is being used for high thickness

material like Ceiling Girder , Boiler Feed Piping of 500 MW and Above and also in

Piping of P91. For P91 piping it is necessary but for ceiling girder and BFP discharge

piping it is use to avoid the use of Cobalt -60.

Ultrasonic waves are sound waves of high frequency and inaudible to human ears.

Human ears can detect sound waves of frequency 20 to 20000 cycles/sec

when the frequency exceed the wave is ultrasonic waves. Usually ultrasonic

waves of frequency ranging from 0.5 Mhz to 10 Mhz are used for  testing of

engineering materials.  

Ultrasonic wave changes in its propagation due to material properties

and presence of discontinuities . The resulting changes are detected by testing

system and displayed as an indication. Indications are analysed for acceptance

as per standards.

Like radiography ultrasonic testing is to be carried out by experts only. Those

who have qualified as Level II in certificate course are only competent

person to carryout and evaluate the test record. Only standard block of material

under test is to be provided to them for calibration time to time at site. Now a-days

block from P91 material may be required by them for other material like

p11/p22 may be available with them. For benefit of construction person a purchase

specification of ultrasonic material is given below.

Digital Ultrasonic Flaw Detector Einstein-II - TFT

with Colour Display, Memory of 200 A-Scan Images &

50 Set-up Data, RS 232 for PC Connectivity with

Transfer Software.

Standard Accessories
ATB-1 : 14.4 Volts/4 AH Li-ion Rechargeable Battery Pack
ATC-1 : Battery Charger cum Mains Power pack with
Charge Status indicator & Power Cord
ETK : Special Leather Protective  Case with shoulder sling
and waist-strap.
EL-372  :  Plastic moulded  Foam Fitted Carrying Case
with numerical lock for storage and transportation of
complete kit
EinSoft-1 :  Transfer software on CD-ROM
Eincord-1:  Data cord to interface Einstein-II with PC
Eincord-2 : Data cord to interface Einstein-II with Printer
__       :  Illustrated Instruction (Operation) Manual in English
Calibration Certificate  as per ASTM E-317-06 a traceable
to NABL.
Accessories
M2 SN - Normal Probe , 24 mm dia 4 MHz. '0' Deg.
angle with BNC Connector
MM4 SN - Miniature Normal probe , 10 mm Dia, 4 Mhz.
0' Deg.angle with mini Lemo Connector
MBW 45 N4 -  Miniature Angle Probe , 9x8 mm ,
45 Deg. 4 MHz. with Mini Lemo Connector
MBW 60 N4 -  Miniature Angle Probe , 9x8 mm ,
60 Deg. 4 MHz. with Mini Lemo Connector
MBW 70 N4 -  Miniature Angle Probe , 9x8 mm ,
70 Deg. 4 MHz. with Mini Lemo Connector
MMEB 4H - Miniature Dual Crystal Probe , 10 mm Dia
4 MHz., 6 Deg. Roof Angle with Mini Lemo Connectors
PKBB-2 - Probe Cable BNC to BNC, 2 Mtrs. long
MPKBL-2(dual) -  Dual,  BNC to Mini Lemo, 2 Mtrs. long
MPKBL-2   -   Probe  Cable, BNC to Mini Lemo, 2 Mtrs.
ES-45- Replaceable Protective Membrane for normal probes of 24 mm dia (1 set = 10 Nos)
ES-24 - Replaceable Protective Membrane for mIniature normal probes of 10 mm dia (1 set = 10 Nos)

In addition to that laptop/desktop and printer are also required.

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