Hydro-Fluoric (HF) Alky Unit Monitoring


Customer was sending NDT technicians to inspect the top of the HF Alky unit daily to monitor specific low spots to ensure wall loss did not exceed minimum required rate before outage planned in 6 mo. Now using system to correlate corrosion data to integrity operating windows (IOWs)


HF Alky Unit (HF Isostripper OVHD elbow), ~150F

  • 24” Sch. 40 … most piping is < ½” nominal wall but measured at ~0.300” with pitting and general “low spots”

Product Used

smartPIMS Cellular

  • smartPIMS LT Cellular w/ 8 dual element probes temporarily attached, managed by refinery maintenance
  • Monitoring interval: 12 hours
  • Data is monitored & trended daily using webPIMS
  • Installation time: 4 hours


Objectives achieved:

  • Safety – kept personnel from climbing & cumbersome inspection positions on tower
  • Economic – saved >$365K in inspection cost
  • Easy to install/monitor, accurate & semi-permanent solution

Share this post

Share on linkedin
Share on print
Share on email

Jeff Anderson: Houston – We Have a Problem

In 2010, the largest offshore oil spill in marine history occurred along the Gulf of Mexico. The economic and ecological costs were devastating. Before becoming the general manager at SNI, Jeff played a critical role in developing a transducer to scan the cracked pipe that caused the Deepwater Horizon Oil Spill.

Read More »

Jim Shimp: Flying Towards a Safer Future

For a second time, the fan blade on a commercial airplane had disconnected because of a failure in the dovetail. Jim Shimp relied on his decades of experience to design and build a transducer to inspect all of the dovetails for these commercial airplanes.

Read More »
Sensor Networks, Inc.