API-510 Pressure Vessel Inspection

Pressure vessels perform an important duty, but they also pose a significant risk if they aren’t maintained properly and inspected regularly. If you have a pressure vessel that was built in accordance with a vessel code, such as ASME Section VIII, you will need to be prepared for the API-510 pressure vessel inspection. This code applies to most refining and chemical process vessels that have been placed into service. Vessels that fall under this inspection are required to have a name attached with an ASME stamp on the plate, and they normally have an internal pressure greater than 45 pounds per square inch (PSI). To learn more about the API-510’s criteria, please scroll down . . .

API-510 Pressure Vessel Inspection

The code for this program is written and maintained by the American Petroleum Institute (API-510), and it details inspection intervals, requirements, and the acceptance of results. The code also includes sections for repairs of the vessel, which can be used as needed. Remember that the inspection reports and repair documentation must be kept on file for the life of the vessel.

Off-Stream Inspections

Off-Stream Inspections (vessel taken out of service) are required every 10 years. If possible, the vessel needs to be opened and cleaned for confined space entry. Normal inspections performed during this examination include the following:

• Internal & External Visual Inspections (VT) are performed by a certified API-510 inspector using the recommended visual checklist. They include the following components:
  • Foundation
  • Shell (internal and external), including out-of-roundness and bulge inspection
  • Heads (internal and external)
  • Nozzles (internal and external)
  • Ancillary equipment (i.e. gauge levels)
  • Pressure relief valves
• Ultrasonic Thickness Testing (UTT) Inspections are performed by an ASNT Level II Certified UT Inspector. The following components are usually examined for ultrasonic thickness:
  • Shell (internal and external)
  • Heads (internal and external)
  • Nozzles

NOTE: Additional inspections may be required depending on the results of the initial inspections (i.e. Magnetic Particle (MT) on the welds).

A final report should be completed showing all of the inspection results and recommendations. In addition, this report should show short- and long-term corrosion rates as well as a remaining life calculation. A client-approved engineer must review the report to determine if the vessel is suitable for continued service.

On-Stream Inspections

On-Stream Inspections (tank not taken out of service) should be performed every five years. Typically, these inspections include the following:

• Visual inspection, performed by an API-510 certified inspector, of the following components:
  • Foundation
  • External shell
  • External heads
  • External nozzles
• UTT inspection of the following components:
  • External shell
  • External heads
  • External nozzles

A final report should be completed to show the inspection’s results and recommendations. In addition, this report should provide the short- and long-term corrosion rates as well as a remaining life calculation. Finally, a client-approved engineer must review the report to determine if the vessel is suitable for continued service.

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Is your pressure vessel due for an API-510 inspection? If so, contact Environmental Works, a full-service environmental consulting and contracting firm. With our many years of experience managing major environmental projects, you can feel comfortable trusting us with your pressure vessel and storage tank needs. We can provide API-510 inspections as well as cleaning and confined space entry. To learn more about our services, please give us a call at 417-890-9500 or contact us online.