Pipe Scanner is a girth weld scanner, suitable for use on a wide
range of pipe diameters. As the scanner is held onto the pipe
using an industry standard toothed drive belt it can be used on
non magnetic pipes. It is capable of scanning the full 360°
of a circumferential weld and it is available in either a manual
or semi-automatic version.
three variations of the scanner:-
Type 1 has
a manual circumferential drive. When the unit is to be moved in
a circumferential direction, a form of indent will restrict the
movement to a pre-set value. This will provide a standard square
raster pattern with scanning in both directions of movement of
the axial bar.
Type 2 uses
the movement of the axial bar through a gearbox to provide the
circumferential movement of the scanner. When the axial bar is
moving in one direction a clutch disengages and no circumferential
movement takes place. It is common for the scan to happen in this
direction. As the rod is moved in the opposite direction, the
clutch engages and the whole scanner moves in the circumferential
direction. The length of the stroke determines the circumferential
movement, so a 400mm axial stroke will produce twice the movement
of a 200mm stroke. This produces a saw tooth scan and the flaw
detector can be set to ignore the scan in one direction.
Type 2A is
a more complex version in which the circumferential movement can
be pre-set to give a different circumferential movement for a
given axial movement.
Type 3 uses
an electric motor to provide the circumferencial movement. The
movement is instigated by the axial bar triggering a limit switch.
The movement is controlled by reading the encoder, so moving through
a pre set distance. This provides a standard square raster pattern
with scanning in both directions of movement of the axial bar.
can be operated on one of two modes.
mode is used for raster scanning where the primary axis is the
axial movement. This mode is for the pulse-echo inspection of
a weld or for corrosion mapping. The probe is moved axially along
the pipe, by the operator, over the required scan length and then
the whole unit is moved circumferentially, manually, through a
gearbox or by an electric motor.
mode of operation is used for TOFD scans. In this mode the axial
bar is locked in position with the probes set the correct distance
apart and relative to the weld to be inspected. The carriage or
gearbox is then pushed, or driven around the pipe to obtain the
necessary scan. It is possible to lock the circumferential movement
at any position during the scan to allow the operator to move
their position before continuing the scan.
are encoded by an optical, quadrature encoder with a lines per
revolution count such as to provide at least 5 lines per mm of
movement. A higher count can be provided if required.
OF THE SCANNER
of the toothed drive belt, an industry standard item, is to hold
the scanner onto the surface of the pipe. The belt has to be measured
and cut for each of the different pipe diameters and then the
two ends joined together. This same belt is suitable for all pipes
of the same diameter as the joining method allows the belt to
be joined and re-joined at will. Once the belt has been placed
in position and joined, it is tensioned by moving one of the guide
also acts as a guide for the scanner to help keep it a constant
distance from the weld.
bar serves two purposes, one is to carry the probe holder and
the other is to operate the encoder. Where the gearbox is used
it also drives the circumferential movement.
contain the method of producing the circumferential movement and
also act as a junction box for the electrical, ultrasonic and
umbilical connections. The standard length of the umbilical is
EXTENT OF SUPPLY
industry standard toothed drive belt
belt joining clasp
encoder on each axis
axial arm stroke 200 mm
1 off constant force tool post
composite tyres on the wheels
Type 1 Scanner
carriage for manual indexing with a lock on the circumferential
Type 2 Scanner
gearbox for automatic indexing with a lock on the circumferential
variable distance gearbox for automatic indexing with a lock on
the circumferential axis,
Type 3 Scanner
electric motor drive of the circumferential movement
2. Adaptor Bar for TOFD scanning
3. Ability to skew the probe
4. Transit case
5. Long umbilical
6. Constant force toolpost
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