Turnkey decommissioning of refineries, chemical plants, power stations and heavy process facilities — isolation, cleaning, de-inventory, dismantling, remediation and regulatory close-out under a single accountable contract.
- Programme duration
- 3 – 30 months typical
- Scope coverage
- De-inventory → dismantling → remediation → close-out
- Consents managed
- CPCB / SPCB · local authority · client HSE
- Evidence output
- Indexed close-out dossier with clearance certification
Decommissioning a process facility is a regulatory exercise as much as an engineering one. The physical work — draining, purging, cutting, lifting — is bounded by consent conditions, environmental obligations and evidence requirements that must be satisfied before an authority will release the site. DDMS Global manages both halves under one contract, so the engineering programme and the compliance programme move as a single sequence.
Our decommissioning teams take the facility from its final operating state through de-inventory, cleaning and isolation, into structural dismantling, and out the other side to a surveyed, certified footprint. We assume responsibility for the transitions between those phases — historically where decommissioning projects lose time, because each contractor waits on evidence the previous one did not produce.
Every programme is built around a hold-point register. Nothing progresses past a hold point until the defined evidence exists: a gas-free certificate, an isolation verification, a clearance sample result, a structural sign-off. It slows the first week and saves the last three months.
Scope coverage
- Refinery and petrochemical unit decommissioning
- Chemical plant retirement and de-inventory
- Power station and boiler house decommissioning
- Tank farm cleaning, degassing and demolition
- Process pipework isolation and drainage
- Residual product removal and neutralisation
- Regulatory close-out and clearance certification
- Brownfield land preparation for redevelopment
Decommissioning strategy
We establish the end-state definition with you — demolition to grade, slab retained, land remediated, or partial retention for reuse. Every downstream decision follows from that definition, so it is fixed first and in writing.
Hazard and inventory register
Full register of residual product, hazardous materials, stored energy, contaminated ground and confined spaces. This register drives the permit structure, the PPE regime and the waste routing plan.
De-inventory and cleaning
Draining, purging, chemical cleaning, neutralisation and gas-freeing of vessels, lines and tankage. Atmospheric testing is documented and certificates are issued before entry or hot work is authorised.
Isolation and de-energisation
Mechanical, electrical, hydraulic and process isolation with positive verification. Isolation boundaries are physically marked at the work front, not only recorded in the permit file.
Structural dismantling
Sequenced removal of process structures, pipe racks, vessels and buildings using the engineered method developed during planning, with temporary works installed as load paths change.
Remediation and clearance
Ground investigation, contaminated soil handling and remediation where required, followed by clearance sampling and verification against the agreed criteria.
Regulatory close-out
Compilation and submission of the evidence pack — waste manifests, clearance certificates, survey records and photographic close-out — to release the site formally.
Single accountable contract
One contractor across cleaning, dismantling, remediation and close-out removes the interface gaps where decommissioning programmes typically stall.
Hold-point discipline
Defined evidence gates prevent the late-stage rework that occurs when a phase advances without the certification the next phase depends on.
Land returned to use
The end state is a surveyed, documented and clearance-certified footprint ready for redevelopment or divestment.
Liability closed properly
A complete, indexed evidence dossier means the environmental and safety liability closes with the project rather than following the asset owner forward.
- Programme duration
- 3 – 30 months typical
- Scope coverage
- De-inventory → dismantling → remediation → close-out
- Consents managed
- CPCB / SPCB · local authority · client HSE
- Evidence output
- Indexed close-out dossier with clearance certification
- Interfaces
- Operations · HSE · regulator · redevelopment party
Answered directly by the engineers who deliver this scope.
Considerably earlier than most owners do. Involving us before final shutdown lets us influence how the plant is left — the state of the de-inventory, what is drained, what is left charged. Decisions taken in the last operating weeks can move the decommissioning cost by a wide margin.
We prepare and compile the technical evidence and can manage the submission process on your behalf. Statutory duty-holder responsibility remains with the site owner, so we structure the evidence pack to let you discharge it defensibly.
Ground investigation is carried out against the historic use of each area. Where contamination is confirmed, we agree remediation criteria with you and the regulator, execute the removal or treatment, then verify with clearance sampling by an independent laboratory.
Yes. Where a site is being divested or redeveloped in parcels, we structure the programme so that cleared, certified areas can be released early while work continues elsewhere behind hard segregation.
Isolation and permit records, gas-free and entry certificates, lift plans and temporary works designs, waste transfer and manifest documentation, weighbridge and recovery reconciliation, remediation validation results, final survey and a full photographic record — indexed and cross-referenced.
Talk to us about plant decommissioning.
Send the asset, the constraint and the date. We will come back with a method and a realistic programme before anyone discusses price.