CDMS Engineering’s multi-disciplinary engineering team offers a suite of maintenance services for a broad range of industries. From start to completion, whether it’s an inspection, a repair and replacement assessment or troubleshooting, your job will be handled most professionally by CDMS.


Maintenance Inspections

CDMS can perform structural inspections for process plants (for oil and gas, minerals) and other industrial structures, such as large storage sheds.

In some cases, such structures may experience corrosion or damage (for example, due to vehicle impact) after being in service for many years. The consulting engineers at CDMS can inspect and assess the damage. To provide accurate conclusions based on engineering analysis and experience. Other examples include lifting equipment that has experienced corrosion.

The analysis of damage found from inspections can follow AS 3990, AS 4100, or other standards as per the client’s requirements.

Repair & Replacement Assessments

CDMS utilises its multi-disciplinary engineering team to assess the condition of a variety of different in-service structures and mechanical equipment for their safety and suitability for continued long-term service.

During routine inspections, inspectors can detect serious flaws or defects in equipment and components. Corrosion, abrasion, and erosion typically cause such damage, and often technicians can find these defects after performing internal inspections during a scheduled plant shutdown.

After a quantitative engineering assessment, experts may deem that particular equipment can no longer continue to operate safely, thus necessitating the repair or replacement of damaged components. This can prove to be very beneficial to an operator, saving them significant future downtime costs, without sacrificing the overall plant integrity.

CDMS works closely with the operator to replace all the compromised structural and mechanical equipment, by providing all the necessary design calculations and detailed design drawings. We will also supervise the site installation and repairs as well as confirm all replacement equipment complies with the appropriate equipment standards or specified technical design standards.

maintenance temporary structures

Temporary Structures

CDMS recognises the importance of safety during the construction phase. Because of this, CDMS has worked with clients during this time to ensure that the structure is structurally adequate during construction. Works relating to this include the safe jacking of an existing tank to replace its rusted floor. Where CDMS ensured that the connections to the jacking points were structurally safe and that during high winds, the tank was still stable and not able to overturn. Other works include the temporary propping of a 90-metre diameter thickener during the construction phase.

Maintenance Trouble Shooting

From time to time, both onshore and offshore process plants encounter maintenance-related issues, where the techniques for finding and fixing process plant problems are referred to as ‘Trouble Shooting’. Drawing from 30 years of oil and gas plus minerals plant design experience, CDMS can provide comprehensive troubleshooting analysis of complex multi-discipline engineering problems, to arrive at the most cost-effective solution.

Consulting engineers at CDMS aim to provide an emphasis on problem-solving techniques, utilizing their vast experience and lessons learned from working on various real-life examples. CDMS has developed a methodical approach to troubleshooting over the years. Which has involved data gathering, validation and utilization procedures being combined with failure identification and root cause analysis.

These analytical procedures are used to recognise how different components of a processing facility interact with each other. As well as, the significance of these interactions. The technique of root cause analysis has been used by CDMS engineers to pinpoint and correct faults. Including in LNG chemical process plants, bulk material transfer systems, petroleum refining equipment, turbines, motors, piping, kilns, heat exchangers, pressure vessels, tank leakage, and environmentally friendly operations.


Some examples of previous troubleshooting work that CDMS has done include the re-rating of critical pressure vessel equipment for both the Woodside Pluto and Karratha LNG process plants A combination of analytical methods and FEA was used to perform the re-rate to comply with the current pressure vessel design standards.

Failure identification and pipe stress analysis simulations have been performed by CDMS to show that cracking in an offshore pressure vessel was due to stresses exerted by the surrounding pipe work. We showed the client that it was not only necessary to replace the damaged pressure vessel, but that they should also redesign and replace some of their existing pipework, which would prevent the cracking from re-occurring in the future.

A root-cause analysis was undertaken by CDMS of potential fatigue cracking through thermal cycling inside a carbon reactivation kiln. A series of static and thermal stress analyses using FEA were performed to determine the stresses in the kiln. It was clear from the results that the thermal stresses alone were not sufficient to cause crack nucleation. After further data gathering and investigation by CDMS, they found evidence of intergranular corrosion. Leading to stress corrosion cracking, indicating severe damage to the alloy caused by the process conditions.


CDMS has in-house capabilities for the deconstruction of decommissioned plants. To deconstruct decommissioned plants, a trained engineer needs to perform checks on the structures. This often lack drawings due to their age and can suffer from extreme corrosion. We can provide safe lift methodologies, full design reports, recommended limitations on maximum lifted pieces and designs for various spreader bars and welded lifting lugs (if appropriate) for your particular job. In the past, CDMS has provided deconstruction designs on items. This Includes bulk storage tanks, in situ frames, the removal of mechanical plants and the deconstruction of Bulk Material Unloading cranes. CDMS specialises in safe lifting practices to save clients time and money.

Please send your enquiry today via email to and we will call you to discuss your project.