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We are an In-Service Approved Inspection Authority (AIA I-S), however our many years in working with pressure vessels gives us a network of respected authorities in related fields.


  • Get fully compliant in-service pressure vessel inspections
  • Secure useful advice related to your pressure vessels’ condition and maintenance
  • Obtain referrals to best-in-field expertise outside our area of operations.
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We work within your procedural framework to complete your pressure vessel inspection
Need more than the services of an AIA-IS?

Pressure Vessel Preperation

Simple Steps

It is your responsibility to ensure:

  • The vessel is checked to state that it is no longer under pressure;
  • The vessel is drained;
  • All pipes and fittings to and from the vessel are disconnected and blanked off, isolating the vessel.

At this point the inspector is able to enter the vessel for internal inspection. Once he is satisfied with the internal and external inspection, pressure vessel preparation continues:

  • The relief valve is removed and a plug is inserted.
  • The vessel is filled, for example, with water.
  • Manual or mechanical pumps are used to pressurize the vessel.
  • A regulator is instead used when pressuring with gas.
  • Pressure is monitored with a SANAS accredited gauge.
  • The vessel is checked for any leaks.

The inspector must witness the pressure test process. Once there is certainty that no leaks are present, the vessel is turned over to the inspector for inline pressure vessel inspection. This process is completed more rapidly than the procedures leading up to it, allowing you to begin using your pressure vessel again quickly if the inspection is passed.

Photo of air receiver
Air receiver - Out of sight, out of mind?
Photo of coating failure due to corrosion
Corrosion due to coating failure.
Photo of pressure vessel conections
Pressure vessel conections.

Non-destructive Testing

Covers a wide group of analysis techniques used to evaluate welds, structural weaknesses, and properties of material.

It is an area of great value, where the integrity of a item is of concern, we use it with the help of third party practitioners where doubt may exist

We ourselves use visual inspection and ultrasonic thickness testers to see that material has not diminished and check as built dimensions, and to evaluate projected life of the vessel.

When our senses tell us something seems in doubt we bring in the specialists as these are professionals with specialist skills to interoperate the results.

People offering NDT require to be certified and registered.

Other forms of testing include in alphabetic order:

  • Computed radiography;
  • Digitial radiography;
  • Eddy current inspection;
  • Hardness testing;
  • Immersion ultrasonic testing;
  • Liquid penetrate;
  • Magnetic particle;
  • Phased array testing;
  • Radiographic inspection;
  • Ultrasonic inspection;
  • Visual inspection.

These principals are called for only when concern is raised and only with the owner’s consent.

Photo of ultra high pressure pumping
Pressure Pumping Equipment.
Photo of heat exchange divider plate corrosion
Degradation and corrosion in heat exchanger divider plates.
Photo of metal degradation in pressure vessel
View of corrosion on the water line of an air receiver.

Pressure Vessel De-regulation

Your pressure vessel is showing signs of wear and tear. Can it still be used in accordance with adjusted specifications? Your AIA has the qualifications and certifications that are needed to determine this.

When is a pressure vessel ready for deregulation

  • There are signs of corrosion;
  • Metal degradation has occurred;
  • There is mechanical damage or deformation

In such instances, there are three options based on the condition of the vessel:

  • Repair and recertify the vessel;
  • Scrap the vessel;
  • Deregulate the vessel for use at a lower pressure

Deregulation requires complex engineering calculations by a certified AIA in consultation with design engineers.

When should you consider deregulation?

We will not deny that a full AIA process will be costly. However, large pressure vessels are also costly, and if they can be repurposed or repaired, it makes sense to undertake the process.

We will advise you honestly and fairly as to which options are best in your circumstances.

Deregulation is a viable option when:

  • The pressure vessel in question is large and costly.
  • Replacement will take a significant period of time.
  • The pressure vessel is unusual and it will be difficult to obtain a replacement.
  • The pressure vessel is extremely costly and can be repurposed or work to reduced specifications.
Photo of internal coating failure with associated corrosion
Extensive paint failure and the results.
Photo of internal lake and pit corrosion on heat exchanger
Why pipe work is included in the PER regulations, scouring and degradation
Photo of internal base of a pressure vessel
Pressure vessel internal base.
Photo of flange corroded bolts
Corroded bolts from flange.

Contact Us

Gillian
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
Deneysville
Free State
1932
Contact Numbers
0027 (084) 745 9152
0027 (016) 371-2222

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