Pressure Vessel Inspections aren’t just an onerous legal requirement, they also ensure that dangerous equipment isn’t being used at your facility.

  • Efficient inspections
  • Minimal disruption
  • Comprehensive results
  • Complete record keeping
Icon depicting certification
And Safety
We work with you to ensure full legal compliance. Your safety is our priority.
Find out about the inspection process and how it works.

Pressure Vessel Inspection


In-service inspections take place on your site and involve minimal disruption to your day-to-day activities. SANAS vessels under pressure accreditation requires a lengthy training and certification process. You may not have accredited staff members with the necessary equipment to pressure test your vessels.

Since we are SANAS approved and, as such, compliant with the DOL requirements we have not only the right equipment, but the accreditation to go with it. In addition, although the legal requirements are relatively new, we have been performing exactly this service for over three decades.

Apart from performing your in-service inspections, we also report on any wear-and-tear that should be seen to in order to prolong the service lifetime of your equipment, and provide you with the necessary documentation to prove that you have complied with OHSA regulations.

From the time you contact us, we strive to ensure that the entire process is quick, easy and efficient, and that you are fully informed of any pressure vessel inspection requirements that may impact on your operations. Bureaucratic delays are eliminated, and we spring into action as soon as we have full order confirmation from your company.

Finally, we ensure that you have legally compliant pressure vessel inspection reports, ensuring that you will have all the necessary documentation handy if Department of Labor officials request it. Peace of mind comes with safety legislation compliance, and we provide you with all the services and documents you need to achieve just that.

Photo of heat exchange vessel
Another example of a heat-exchange vessel.
Certified inspector on-the-job
We make your inspection as painless as possible.
Photo showing correct ppe clothing
Our personnel adhere to personal protective equipment (PPE) clothing requirements.

Pressure Vessel Inspection Checklist


Pressure Vessel Inspection ensures that due diligence is done to ensure the integrity of pressure vessels. If critical weak spots were to develop, pressure vessels could explode, even when being operated within the manufacturer’s pressure parameters. Various Pressure Vessel Inspection regulations have been applied over the years, and older vessels may need a different approach to inspection than the pressure vessels of today while still fulfilling regulatory requirements.

Pressure Vessel Details

  • Is the nameplate attached and is the data legible.
  • Compare name plate test pressure with: job card info/code data.
  • Record gauge range and details and if calibration certificate is current.
  • Is water certificates available & are chlorine levels within limits.
  • Gauge details.

External Inspection

  • Is the earth cable secured / PIR in place with a red mark & correct range for MAWP (maximum allowed working pressure)
  • Are supports secured and is bolting tight.
  • General condition of inter-connecting piping and piping supports.
  • Is paint work/insulation in serviceable condition.
  • Is insulation fully or partially removed for inspection.
  • Is there any form of corrosion or other metal degradation underneath paint or insulation.
  • Is there any form of crevice corrosion on weld seams or supports.
  • Is insulation in serviceable condition. Condition of insulation cladding.
  • Is there any form of mechanical damage i.e. indentations etc. (Gaskets faces included).
  • Is there any deformation/thinning of nozzles or bellows.
  • Is there any significant metal loss since last measurement.
  • Is there any trace of product leakage/spillage.
  • Check compad weep holes for signs of corrosion, other attachment welds.
  • Has RV (release valve) been reset and calibrated.
  • RV number:

Internal Inspection

  • Is there any form of erosion/corrosion present.
  • Is there any form of pitting or lake corrosion present.
  • Are there signs of galvanic corrosion.
  • Check the condition of the lining/cladding or coating whichever applicable.
  • Check for mechanical damages.
  • Check condition of the ministers/agitators/pipes/gratings/ other internal attachment welds.
  • Check front and rear end of tubesheets as well as the internal bore of tubes if applicable.
  • Check condition of magnesium anodes.
  • Check all sealing faces on flanges.
  • Check for erosion around or on the internal bore of any outlet nozzles or blanks.
  • Check downcomers, bubble caps, raschig rings, tray supports or other distillation parts.
  • Closely examined the liquid level/vapour zone for any tell-tale traces of metal degradation.
  • Confirm results of all NDT carried out to assist with visual inspections.

Legal Compliance

  • Is there a certified copy of the original certificate of manufacture.
  • If the nameplate data legal and compliant with OSH Act / Mines & Works Act.
  • Are all inspection records maintained and up to date.
  • Is there a G/A drawing and materials of construction identifiable.
  • Is there any evidence of previous or current metal loss.
  • Is there evidence or records of previous metal degradation and repairs to equipment.
Stainless steel vessel nameplate
The nameplate is the vessels identification and supports the design codes, etc.
It’s all about the pressure gauge indication
Your pressure gauge is an important pressure monitoring component.
Photo of the spotless interior of a process plant
The interior of a process plant.
Photo of very old vessel nameplate
The interior of a process plant.
Photo of a bad vessel nameplate
This nameplate can't be used.

Pressure Vessel Failed Inspection

Internal Inspection

Although it is an extremely rare occurrence, pressure vessels sometimes fail to pass muster. In this case, we will inform the owner of the pressure vessel or the responsible manager together with recommendations that can be used to rectify the problem (where applicable). Once these conditions have been addressed, the certificate is modified to show that concerns have been addressed, and the vessel can be used for a further three years.

Finally, there are circumstances in which the vessel cannot easily be recertified. In this case, it’s owner has three options:

  • Scrap the vessel.
  • Repair the vessel (A full AIA is required hereafter).
  • Deregulate the vessel (A full AIA is also required).

Pressure Vessel Repairs & Maintenance.

What most frequently causes a need for pressure vessel repair and maintenance?

Oxidization is the primary culprit. The atmosphere inside the vessel is not conducive to its longevity, and when oxidization sets in, internal components stick or malfunction. Corrosion is also caused by strong acids and alkaline.

In most cases, such vessels can be serviced, recalibrated and recertified.

Other types of deteriotion.

We commonly see:

  • Pitting
  • Crevice corrosion
  • Heat affected zones
  • Laking
  • Carbon contamination
  • Signs of impeachment
  • Flaking
  • Erosion
  • Molecular crystallization of parent material.

Owing to our extensive experience in the field of pressure vessels, we can advise our clients on ways to increase the longevity of their pressure vessels.

In addition, although it does not form part of our normal brief, we can assist with calibration of gauges and relief valves. This value-added service is rarely offered.

What Next?

Our assistive services can help rectify the failure with an alternative method to buy time and save money. No stress is required to wait for your new pressure vessel to arrive while continuing with production.

Fluorescent dye penetrate showing cracks
Fluorescent dye penetrate used on an internal stress corrosion weld.
Photo of longitudinal weld cavitation
A sample of longitudinal weld cavitation.
Photo of process reator after inspection
A sample of a process reactor post inspection.

Contact Us

Call Me Now! I'm always available during office hours to take your call: Gillian.

Mon - Thu between 07H30 to 17H00.
Fri - between 07H30 to 15H00.

Physical Address
64 Wendy Street
Free State
Contact Numbers
0027 (084) 745 9152
0027 (016) 371-2222

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