National Techincal Services Remote Field Testing

Above is a sample tube sheet diagram from a final report. The inspected tubes are color-coded with a percentage of wall loss.

For Ferromagnetic Tubes

Remote field testing (RFT) is used to inspect ferromagnetic tubes. It can be applied toward prime surface or low fin tubing.

The Best Crews in the Business

The National Techincal Services difference is our highly trained crews. They work efficiently and report quickly.

They are unique in the industry in that they consist of:

  • a two-person team to perform the inspection
  • an additional technician to analyze results on-site.

The result is we can typically provide:

  • an initial report on the day of inspection
  • a final report that is delivered in days, not weeks.

Our crews are trained in a variety of tubular testing techniques so they can perform complementary inspections, providing the most comprehensive service possible. Other techniques include:

Thorough Reports, Fully Explained

Reports are only useful when the customer understands them fully.

National Techincal Services ensures our customers understand our reports by:

  • explaining initial reports on the day of inspection
  • providing a timeline for final report delivery
  • conducting an exit interview to answer all questions.

National Techincal Services’s goal is to provide excellent service and exceed the industry standard.

Quick Guide

RFT is used with ferromagnetic metal such as carbon steel and can be applied toward prime surface or low fin tubing.

corrosion, errosion, pitting, fretting, wall loss, wear at baffle locations, through-wall holes

Inner Diameter/Outer Diameter Recognition
RFT can detect ID and OD defects but cannot distinguish between ID and OD.

Outer Diameter Range
.5” – 3.5”

Wall Thickness Range
.049” – .250”

Production Rate of Three Person Crew
Up to 350 20’ tubes / 8 hour shift

Site Preperation Information

  • clean tubes so they are free of scale, debris, and most importantly magnetic deposits (10,000-20,000 psi hydro-blasting is recommended)
  • provide 110 VAC power source
  • provide scaffolding and/or cover for equipment.

Pre-Job Information

  • equipment number
  • service name
  • total number of tubes
  • percentage of tubes for inspection
  • tube material
  • tube outer diameter
  • tube wall thickness or gauge
  • tube length
  • access requirements to exchanger
  • special safety requirements
  • suspected or predicted damage
  • tube side service
  • shell side service