Long Range Ultrasonic Testing Presentation [PDF]

Zitiervorschau

DACON INSPECTION SERVICES

LONG RANGE ULTRASONICS LRUT

LONG RANGE UT

Long Range UT:

• Waves are sent along the pipe • 10’s of meters of pipe are examined form one location

• Difficult to inspect areas • Road crossings • Insulated piping • Etc.

DACON INSPECTION SERVICES

PERFORMANCE YOU CAN TRUST

LONG RANGE UT

Capabilities:

• Can be performed at elevated temperatures without taking the pipe out of service

• 100 % of pipe is inspected (within the diagnostic length of a test) • Pulse echo type operation provides information on feature position and approximate size

• Sophisticated analysis aids the interpretation of results.

DACON INSPECTION SERVICES

PERFORMANCE YOU CAN TRUST

LONG RANGE UT Target applications:

• Rapid , full coverage screening of pipes • Especially cost effective in difficult to access locations: • • • • • • •

Sleeved road crossings River crossing Corrosion under insulation Wall penetrations Pipe racks Jetty lines Offshore risers (including splash zone and underwater section)

• Can detect cracks and general metal loss (greater than 5% of the cross sectional area

DACON INSPECTION SERVICES

PERFORMANCE YOU CAN TRUST

LONG RANGE UT

Pre inspection set up:

• A ring of transducer is placed around the pipe • No couplant required • Usually no surface preparation required. • Slight cleaning • Removal of flaking paint/scale

DACON INSPECTION SERVICES

PERFORMANCE YOU CAN TRUST

LONG RANGE UT

Probe collars

• Tested using inflatable probe ring • Air connection connected to equipment, auto inflated. • Diameters 1.5-48 inch • 6 inch clearance needed around pipe

DACON INSPECTION SERVICES

PERFORMANCE YOU CAN TRUST

LONG RANGE UT

• How it works • Guide waves are sent in both directions • Defects, welds and pipe features reflect back signals • Reflections are analyzed • Data is verified

DACON INSPECTION SERVICES

PERFORMANCE YOU CAN TRUST

LONG RANGE UT

Equipment

• Teletest Focus Plant integrity M3/M4 • Integrated air pump • Min thickness 3 mm

• Max thickness 40 mm • Temperature between 0 and 100 Degrees (up to 125 degrees in some cases)

• Frequency 10-100 KHz • Carbon steel, alloy Steel, Stainless steel • Torsional, longitudinal and Flexural waves

DACON INSPECTION SERVICES

PERFORMANCE YOU CAN TRUST

Example signal

DACON INSPECTION SERVICES

PERFORMANCE YOU CAN TRUST

LONG RANGE UT

Backward

Series of Welds

Position of Ring

Forward

Iconic representation of identified features

Decay Curves

Corrosion is indicated by large red component DACON INSPECTION SERVICES

PERFORMANCE YOU CAN TRUST

LONG RANGE UT The symmetric nature of a defect can help classify it

More serious

RED = BLACK

DACON INSPECTION SERVICES

Amplitude Ratio

When the feature does not extend very far around the circumference,

Less serious

When the feature extends significantly around the circumference,

1

0

100% 50% Circumferential Extent (percent)

0%

RED