Custom Engineering Capabilities

InterTest's in-house engineering and manufacturing capabilities solve the toughest remote visual inspection (RVI) applications.

Below are examples of past challenges, developments, and custom solutions products.

Need a custom engineering solution for you application? Contact us to see how InterTest can help you reach a solution today.

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25-meter Snare Retrieval Tool with 50-meter Ball-on-Wire for FOD Removal


InterTest Engineering Capabilities
• Robust 25-meter, snare-style retrieval tool
• 5 mm ball bearing on the end of 50-meter wire
• Innovative FOD removal solution

iGrab

Description

Challenge 

25-meter Snare Retrieval with 50-meter Ball-on-Wire for FOD Removal

Effective foreign object search and retrieval (FOSAR) and  FOD removal are critical to the power generation industry. FOD presents mechanical and safety risks in and around power plant equipment and most often requires complete plant shutdowns to remove them. Emergency shutdowns are never cost-effective or desirable scenarios, so many groups will practice FOD removal during scheduled shutdowns in preparation for such events.

One such customer will simulate the FOD removal of a spanner wrench lodged inside a vertical pipeline. Removing this type of FOD requires a retrieval solution with considerable tensile strength to dislodge, grasp, and maneuver the spanner wrench back up the pipe’s bends. The solution needed to be strong, reliable, and easy to use. The spanner wrench is 400 grams in weight, non-ferrous, and has a 10 mm loop on its end.

The customer can not use a magnet or suction-powered retrieval tool for this particular FOD: the wrench is not magnetic, and suction is unreliable.


Development

With substantial FOSAR/FOD removal experience and tool engineering, InterTest designed a solution consisting of a 50-meter steel spring-coated wire with a 5 mm ball bearing on its end and a 25-meter snare retrieval tool. The design allows an operator to snake the 50 m ball bearing wire down to the FOD location, pass it through its 10 mm loop, and then cinch the 25-meter snare around the ball bearing and pull the wrench out. 

Solution 

During the planned shutdown, operators will extract the wrench from a thin pipe with multiple bends roughly 20 meters from the opening. A ball bearing on a 50-meter wire will be passed through the 10 mm opening in the spanner wrench, and then the snare will be used to grab the ball bearing and pull the wire back to the surface.  With the wire through the spanner wrench, the operator will pull to dislodge and remove it confidently.

InterTest based the snare tool design on the 50-foot iGrab 4mm Snare Manual Retrieval Tool standard product. The throw handle was re-engineered to accommodate the slack in the wire that accompanied the extra length requirement.  The ball bearing wire was specifically engineered with steel spring coating to have enough tensile strength and resilience to be pushed around pipe bends and successfully fed through the 10 mm loop on the wrench.

Related Products: 

iGrab™ Retrieval Tools

FOSAR Video Borescopes - Yateks USA 

 

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