Axis
Pipe Scanner
The
AXIS pipe scanner has been developed to carry out automated ultrasonic
inspection of Autogenous and Orbital T.I.G. welds in ASTM A 182
316H stainless steel tubing.
It
is also designed to operate in hostile environments at temperatures
upto 80degC and radiation levels of up to 600 µ Sv per hour.
It
is capable of detecting and positioning root, cap and mid-wall
L.O.F. defects in small bore pipes.
Benefits
| • |
Fitted
in minutes even in hostile radioactive environments. |
| • |
Can
detect defects in 316 Austenitic welds. |
| • |
Uses
AXICON focused angle contact probes. |
| • |
Fully
automatic twin axis motor drive and encoder positioning. |
| • |
Designed
for use where access is restricted.
Space Envelope
For 38mm diameter tubing - 160mm diameter
x 115mm long (inc. 5mm rastor).
For 50mm diameter tubing - 172mm diameter x 122mm long (inc.
12mm rastor). |
| • |
50m
umbilical |
Construction
and Use
This rastor scanner has been specifically designed to operate
within a tube bundle in a radioactive environment and at elevated
temperatures. It splits to fit around the pipe and is easy and
quick to fit by unqualified personnel. It carries four ultrasonic
AXICON probes each focused to detect and position vertical planar
defects at the inner and outer surfaces and mid-wall of 316 stainless
steel tube welds.
The transducers are carried over the surface in a rastor scan
pattern to cover the weld area.
The four probes are fitted to the scanner as two pairs 180°
apart. Each pair has one probe fitted either side of the weld
line along a common longitudinal axis to enable the through transmission
signal to be monitored. One pair is positioned to detect inner
wall defects and the other pair to detect outer wall defects.
Couplant is provided via a peristaltic pump.
The scanner is driven in the axial and circumferential directions
by DC Motors and its position is transmitted to its controller
using magnetic encoders.
The essential scanner parameters are as follows:
| Pipe
Diameters : |
20
to 60mm
Other pipe diameters can be accommodated |
| Pipe
Wall Thickness : |
Minimum
2.0mm |
| Circumferential
Movement : |
Speed:
3 rpm through 370deg
Encoder resolution: Min 50 pulses/deg
Maximum Backlash: 2deg (0.67mm) |
| Axial
Movement : |
20mm
in 0.25mm increments after each circumferential movement.
Encoder resolution: 30 pulses/mm
Maximum Backlash: 0.2mm
|
| Circumferential
Drive : |
a.
Motor - brushed DC motor providing 1.4 mNM torque in
ambient
temperature of 80degC.
b. Gearbox - to suit above motor and produce 18 rpm output.
|
| Axial
Drive : |
a.
Motor - brushed DC motor producing 1.67 mNM torque in
ambient temperature of 80degC.
b. Gearbox - to suit above motor and produce 46 rpm. |
| Encoders
: |
A
magnetic encoder, TTL compatible producing 15 lines per revolution,
2 channel, to suit above motors. |
| Probes
: |
Highly
focused contact angle probes using AXICON focusing. |
User
Support
Phoenix Inspection Systems is responsible for the design, manufacture
and supply of all its equipment. Comprehensive customer support
and training is available as a matter of course. In addition,
a specialised consultancy service, based on extensive practical
experience of N.D.E systems, can be called upon to advise on specific
inspection problems.
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