AZA Pipeline

Limited Liability Company

 

PIPELINE SERVICES ENGINEERING CONSULTING CLEANING PRODUCTS MUNICIPAL WATER  SYSTEM CLEANING   FLUIDS & CHEMICALS
Caliper Pigging

     AZA LLC represents ANALYTIC PIPE in the Central Africa Region. We conduct projects with tools and complete technological 

   supervision of Analytic Pipe.  For more details about the tools and the techniques used please visit their website 

 

 

                  

Technical Info

 

General Technical Information

 

Sizes:
Minimum ID For Passage:
Maximum Inspection Distance:
Battery Life:
Minimum Bend Radius:
Maximum Operating Pressure:
Temperature Range:
Velocity:
Accuracy Of Odometer:
Sensitivity Of Gauging System:




6“ to 60“
75% of nominal diameter
800 km
400 h (more if required)
1.5xD, 90° bends
120 bar (1700psi)
-20°C to 80°C (-4°F to 148°F)
0.1m/s – 3m/s
±0.5 m from reference girth weld
Dent 0.2%
Ovality 0.2%
Resolution 0.5mm

                                                                                                                         

     

 

     
Principles Of Operation:

The  Caliper-Tool measures diameter reductions in pipelines such as dents and ovalties. Even diameter variations like girth-welds, wall thickness changing-pieces, valves and other installations are detected.
The Caliper-Tool continuously measures the inside diameter of the pipeline through an array of sensing fingers –„spider“- that are spring loaded to hold them in contact with the pipe wall. A large number of sensing fingers provide optimum coverage of the inside circumference. Wheels at the end of each sensing-finger are in direct contact with the pipe wall. The extremely flexible polyurethane cups enable the caliper-tool to be transported through the pipeline by the medium. The Caliper-Tool is able to pass reductions of at least 25%.
The spider is separate from the cup to eliminate effects from cup wear. As the Caliper-Tool moves
through the pipeline, all radial sensor movements are detected and recorded. ID-reductions of 0.4% will be detected.

Odometer wheels generate the distance data which in addition to the measuring data from the spider is continuously collected and stored together with the correlative diameter values.
To locate the caliper-tool in the launcher, receiver or during survey, a locator unit is used. 
The locator unit transmits electromagnetic signals which will be detected by an external inspection tool locator.
A pushing flange is used to push the Caliper-Tool into the launcher and to protect the spider against mechanical damage.

The data-recorder contains all power, processing and recording circuits in a sealed module within the central body of the Caliper-Tool.

Data Analysis and Interpretation

During the survey the Caliper-Tool data are gathered in the solid state memory inside the recorder.
After the run a laptop computer is connected to the Caliper-tool for downloading the data.
The visualization of the survey chart is done with the laptop too.
The interpretation of the complete survey data will be done directly on screen.
All interesting details are marked in the chart and a printout is added to the report.

Before interpretation begins a minimum acceptable diameter reduction is agreed with the customer. 
The interpreter scans the chart for deflections which exceed the agreed value and compiles a features list. 
All indications exceeding the agreed value and also pipeline features like valves, 
T-pieces, wall thickness-changes, girth welds, bends and other installations are listed.

Feature Identification

The following examples show typical pipeline features.

 

Valve station:

 

 Contact us at sales@azaltd.com or Call (237) 762 1883

AZA Limited Liability Company, 350 Rue Sylvanie Douala-Cameroon