Pressure Vessel Inspection

Specialist Inspection – Comprehensive Reporting, Quality Inspection Every Time.

Pressure Vessel Inspection

We have multiple techniques for the inspection of pressure vessels including:

  • Low Frequency Electromagnetic Technique Corrosion Scanning
  • Eddy Current Crack Detection
  • Ultrasonic Thickness Surveys
  • Magnetic Particle / Dye Penetrant Weld Inspection
  • Full Visual Examination
  • Corrosion Under Insulation Scanning (Whilst Insulated)

We have experience scanning pressure vessels using various combinations of these methods, depending on the goals of the inspection.

Case Study: From the Field

A major chemical company in Virginia needed an on-stream inspection of a vessel to determine its reliability. The product in the vessel is highly corrosive to the material of the vessel, so it is lined with a Teflon coating. Due to a faulty pump leaking product onto the vessel numerous times, the surface was heavily pitted on the outside surface. It was determined an API 510 inspection would give the needed information as far as the extent of the corrosion damage by evaluating the pit depths, along with any other ramifications from the damage. There was also concern whether the Teflon lining on the inside was still adequate.

TesTex put together a team to scan the tank with the LFET system, in order to determine the condition of the vessel lining. Due to the product inside the vessel being highly corrosive, a break in the lining would create an area of major wall loss very rapidly. This would give an indication of wall loss with the LFET system. TesTex also provided an in house API 510 inspector to visually inspect the unit and determine the condition of the vessel in general and evaluate the corrosion (pitting) damage.

TesTex first performed an API 510 inspection on the vessel and determined the pitting damage was extensive enough that the vessel did not meet API 510 code per the ASME Section VIII. The calculated minimum wall was 0.151”. Some of the pitting measured 7/32” deep which gave a wall remaining of 0.094”. Also during the API 510 inspection, a 5” crack was found at a nozzle to shell weld along with pitting in HAZ of some welds. TesTex also performed a Low Frequency Electromagnetic Technique inspection on the Stainless Steel shell in order to confirm the remainder of the shell was in good shape. This inspection confirmed there were no indications other than the pits on the outside of the vessel in the damaged area.

To find out more about how we can help with your pressure vessel inspection project call us on 01469 541586. Or send us an Email.