| Feedstock and Permit Classification | Confirm whether whole tyres, shredded tyres, textile-containing tyres, steel-containing tyres, or other rubber waste will be processed. | The legal classification of end-of-life tyres and pyrolysis residues varies by jurisdiction and can determine whether a waste-treatment or air-emission permit is required. | Written classification from the local environmental authority, permit pre-application record, and approved feedstock specification. | Review |
| Process Gas Containment | Inspect the reactor, condensers, gas lines, valves, flanges, seals, and storage interfaces for a closed, leak-controlled system. | The design should prevent uncontrolled release of combustible vapour and non-condensable gas during normal operation, start-up, shutdown, and upset conditions. | Piping and instrumentation diagram, pressure-test records, leak-test procedure, gasket specification, and maintenance schedule. | Required |
| Particulate Control | Check for a suitable dust-removal stage such as a cyclone, wet scrubber, bag filter, ceramic filter, or an equivalent engineered arrangement. | The selected equipment must meet the particulate concentration and monitoring requirements specified in the site air permit; there is no single universal limit. | Guaranteed outlet concentration, filter material data, pressure-drop range, cleaning method, and independent stack-test plan. | Review |
| VOC and Carbon Monoxide Control | Verify whether the design includes a thermal oxidizer, afterburner, flare, or another approved system for non-condensable gas and residual vapours. | The control device must be sized for gas flow, heating value, residence time, mixing, and the emission limits stated in the permit. | Combustion calculations, temperature and residence-time design basis, burner controls, flame-failure protection, and commissioning test results. | Required |
| Acid Gas and Sulfur Control | Assess the expected sulfur and halogen content of the tyre feedstock and check for alkaline scrubbing or another appropriate treatment stage. | Sulfur oxides, hydrogen chloride, and related acid gases must be controlled where required by the local permit and feedstock composition. | Feedstock laboratory analysis, mass-balance calculation, reagent consumption estimate, scrubber design data, and wastewater or residue disposal plan. | Review |
| Emission Monitoring | Determine whether monitoring is required for particulate matter, CO, CO₂, oxygen, nitrogen oxides, sulfur oxides, VOCs, temperature, pressure, and flow. | Monitoring frequency and instrument type must follow the air permit. Automated measuring systems may require quality-assurance procedures such as those described in EN 14181 where adopted. | Instrument certificates, calibration records, data-logging specification, alarm setpoints, and continuous-emission-monitoring quality plan. | Required |
| Pressure and Vacuum Protection | Check pressure transmitters, vacuum protection, relief devices, rupture protection, vent routing, and automatic isolation. | Protection must be based on the maximum credible pressure, vacuum, temperature, blocked outlet, loss of cooling, and gas ignition scenarios. | Relief-device sizing calculation, set-pressure records, inspection certificates, hazard analysis, and relief discharge-location drawing. | Required |
| Fire and Explosion Prevention | Verify combustible-gas detection, ventilation, ignition-source control, flame monitoring, emergency isolation, and explosion-relief or suppression measures where required. | Equipment used in potentially explosive atmospheres should be assessed under the applicable hazardous-area classification and local fire code. | Hazardous-area classification drawing, fire-risk assessment, gas-detector certificates, electrical-area approvals, and emergency-response procedure. | Required |
| Safety Instrumented Functions | Confirm automatic shutdown for high pressure, high temperature, low cooling flow, flame failure, abnormal gas concentration, and loss of critical utilities. | Safety functions should be identified through a documented risk assessment and validated according to the required safety performance level or category. | Cause-and-effect matrix, safety requirement specification, proof-test schedule, interlock test records, and functional-safety validation report. | Required |
| Mechanical and Electrical Safety | Check guards, access doors, emergency stops, lockout points, earthing, cable protection, control-panel design, and safe maintenance access. | ISO 12100 provides a recognized framework for machinery risk assessment; IEC 60204-1 addresses electrical equipment of machinery. Local adoption must be confirmed. | Risk assessment, electrical drawings, earthing test, emergency-stop test, guarding inspection, and conformity documentation. | Required |
| Combustion and Fuel-System Safety | Inspect fuel-train shutoff valves, pressure regulation, burner management, purge sequence, flame detection, and fuel-leak protection. | Industrial furnace and combustion safety requirements may be addressed by EN 746-2, NFPA 86, or another locally adopted code, depending on jurisdiction. | Fuel-train schematic, burner-management logic, purge calculation, valve certificates, combustion commissioning report, and code review. | Review |
| Residue and Product Management | Confirm safe cooling, transfer, storage, and testing of recovered carbon material, steel, pyrolysis oil, and solid residues. | Residues must be classified and managed according to local waste, chemical-storage, fire, and product-quality requirements. | Safety data sheets, representative laboratory analysis, storage-temperature limits, dust-control plan, and disposal or reuse documentation. | Review |
| Local Compliance Pathway | Identify all required construction, environmental, fire, pressure-equipment, electrical, occupational-health, and waste-handling approvals. | In the European Union, industrial emissions may be regulated under Directive 2010/75/EU; in the United States, requirements may arise under the Clean Air Act and state or local permits. Local rules control. | Permit matrix, authority correspondence, applicable-code register, stamped engineering documents, and approval schedule. | Required |
| Factory and Site Acceptance Testing | Require documented tests for capacity, temperature stability, gas tightness, emissions, interlocks, emergency shutdown, and continuous operation. | Acceptance criteria should be agreed before purchase and should match the permitted feedstock, operating envelope, and emission limits. | Approved test protocol, calibrated instruments, signed test records, independent emission report, punch list, and corrective-action log. | Required |
| Operations, Training, and Records | Evaluate operating manuals, alarm response, maintenance instructions, operator training, inspection intervals, and emissions recordkeeping. | Records should demonstrate compliance with permit conditions, inspection requirements, abnormal-event reporting, and preventive-maintenance obligations. | Operating procedures, training matrix, maintenance plan, calibration register, incident log, inspection checklist, and digital data backup. | Required |