Pyrophoric compounds, such as FeS or NiS, pose a latent risk to the safety of equipment, personnel, and the environment. Their treatment allows no room for error or improvised solutions. We have developed and refined a technical decontamination system that ensures a safe, rapid and fully controlled outcome.
What are pyrophoric compounds and why do they pose a real risk?
During the normal operation of many refining units and petrochemical processes, deposits of metallic sulphides are generated as a by-product of reactions with sulphurous compounds present in hydrocarbons. These sulphides — especially iron sulphide (FeS) — can ignite spontaneously upon contact with oxygen if not properly treated before systems are opened.
Our solution: sealed chemical decontamination in a closed-loop system
At Lagupres, we apply a proven methodology based on field experience and the technical expertise of our specialists. We use a sealed, closed-loop chemical cleaning system that prevents oxygen ingress at all times and, therefore, eliminates the risk of ignition.
How do we do it?
- We design a hermetically sealed circuit, using ISO containers as process buffers, in which the neutralising agent is dosed.
- The system includes a controlled venting circuit that redirects any overpressure towards an activated carbon filter or the designated safe point established by the plant.
- Throughout the process, we monitor variables such as pressure, temperature, flow rate, and ISO container levels, ensuring safe operation at all times; intermittent monitoring of pyrophoric activity is also conducted.
One of the most critical aspects in this type of intervention is the effectiveness of the reagent. In our case, we work with a product developed specifically for the neutralisation of pyrophoric substances, capable of:
- Breaking down metallic sulphides such as FeS, NiS and CoS in under 12 hours.
- Degrading benzenes and aromatic compounds without generating hydrogen sulphide (H₂S), which is a key operational and environmental advantage.
- Leaving no hydrocarbon residues, thus facilitating subsequent inspection or repair work.
Stages of the technical procedure
Each intervention is planned individually, but the general framework typically follows these steps:
- Isolation of the system and configuration of the closed-loop circuit.
- Leak-tightness test.
- Injection of the reagent, with continuous recirculation using chemical pumps resistant to the compounds involved.
- Periodic analytical monitoring, taking samples at key points to confirm process development.
- Once total neutralisation is verified, we move on to a technical drying phase, adjusting the dew point according to each client’s inspection specifications.
- Finally, we deliver the equipment ready to be safely opened or restarted.
What benefits does this methodology offer?
From a technical and operational standpoint, the benefits are clear:
- We completely eliminate the risk of ignition caused by pyrophoric substances.
- We prevent the generation of hazardous gases such as H₂S.
- We significantly reduce downtime.
- We produce no emissions or polluting waste.
- Equipment is left ready for visual inspection, NDT or return to operation.
- The decontamination process takes less than one 12-hour shift.
Common applications
We have applied this technology to equipment of various configurations, including:
- Hydrotreatment reactors and columns (HDS/HDT).
- Fractionation towers with deposited sulphides.
- Heavy fuel oil storage tanks.
- Heat exchangers contaminated with FeS.
- Process lines with sulphurised residues in Claus units.
A rigorous approach, tailored to each plant
Each industrial plant has its own particularities: design, operating conditions, internal regulations, operational history… Therefore, before each intervention, we carry out a detailed technical study with the plant’s engineering team in order to design a specific, safe and efficient strategy.
Our team arrives fully equipped, including:
- ATEX-certified pumps.
- ISO containers with pre-defined reagents.
- Personal and collective protective equipment compliant with international standards.
Conclusions
The safe management of pyrophoric compounds is not optional — it is a necessity for any plant that aims to operate responsibly and without unexpected incidents. This is why it is essential to provide the industry with a comprehensive solution, based on engineering, experience and safety as fundamental pillars.
We can help you prevent risks, reduce intervention time and ensure a safe working environment for your team.