Sistemi di controllo

In chemical, pharmaceutical or oil and gas plants, the presence of flammable gases, vapours or dusts is not an exception, but a standard operating condition. Managing an area at risk of explosion involves not only selecting the right components, but also applying rigorous engineering standards to protect people’s lives and the integrity of assets. At ST2 Srl, compliance with the ATEX Directive is at the heart of our E&I design.

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Beyond component marking

Many people think that simply buying a sensor marked with the ‘Ex’ symbol is enough to comply with regulations. The reality is more complex: ST2’s ATEX engineering covers the entire system.

• Zone Classification: We analyse the likelihood of explosive atmospheres occurring in order to correctly define the zones (0, 1, 2 or 20, 21, 22). An accurate classification prevents overspending on unnecessary protection or, worse still, underestimating a risk.
• Verification of Intrinsically Safe (Ex-i) Loops: We meticulously calculate the electrical parameters (inductance and capacitance) to ensure that the energy in the circuit is never sufficient to trigger an explosion.

Documentation: Your system’s ‘passport’

A safe system must also be a well-documented system. ST2 provides its customers with all the support they need to create and maintain the Technical File:

• Tools and Certificates List: Collection and verification of all supplier documentation.

• Verification calculations: Detailed reports demonstrating the compatibility between barriers, cables and field instruments.

• Installation drawings: Diagrams clearly showing cable routes and sealing methods to prevent the spread of flames.

Training and Consultancy

We don’t just hand over the drawings. We support HSE managers and maintenance staff in understanding how to carry out work correctly on a certified system. A single screw that’s not tightened properly on an ‘Ex-d’ (explosion-proof) enclosure can compromise the safety of the entire system: we’re here to make sure that doesn’t happen.

ATEX safety should not be a barrier to productivity. With ST2 Srl’s engineering approach, explosion protection becomes an invisible yet robust part of your plant, allowing you to focus on production with the assurance that you are fully compliant with current regulations.

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Behind a complex industrial plant lie thousands of data points, cables and sensors. But for the operator who has to manage it on a daily basis, it all boils down to one thing: the screen in front of them. At ST2 Srl, we believe that engineering excellence must, above all, be easy to use.

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Not just graphics, but operational clarity

Designing an HMI (Human-Machine Interface) involves more than just choosing attractive colours. It involves analysing the operator’s workflow to help them avoid making mistakes under pressure.

• Intelligent alarm management: We help businesses eliminate ‘false alarms’ that distract staff, focusing attention solely on genuine critical issues.

• Less clutter, more control: Instead of cluttering the screen with hundreds of numbers, we use intuitive graphics that immediately highlight what’s wrong.

Access to data, wherever you are

Today, ST2’s engineering solutions make it possible to access data outside the control room. Thanks to web-based and mobile systems, a production manager can monitor the plant’s operational status directly from their office or home, receiving real-time notifications if any parameter falls outside the safety limits.

Reduce training time

A well-designed system is one that is quick to learn. The interfaces we develop are designed to be intuitive for everyone: clear icons, logical navigation paths and on-screen help. This translates into significant time and cost savings for the company when training new staff.

Automation should not be an obstacle, but an ally. Choosing ST2 Srl means investing in advanced technological systems that remain, however, incredibly attuned to the needs of the people who use them. Because a safe system is, first and foremost, a system that is easy to understand.

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In today’s industrial landscape, finding an engineering firm is easy; finding a partner who takes responsibility for your plant as if it were their own is the real challenge. Many companies struggle with structures that are either too rigid or, conversely, too unstructured to handle complexity. ST2 Srl strikes exactly the right balance: the expertise of a long-standing legacy combined with the agility of a dedicated team.

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International Experience, Tailored Approach

With over 1,300 projects under our belt worldwide, we have encountered every kind of challenge, from desert environments to offshore platforms. This wealth of experience means we never have to ‘wing it’. Yet we treat every project as a one-off: we do not apply standard solutions, but tailor our engineering to the client’s actual operational and budgetary requirements.

The Value of Continuity

One of the biggest problems in large firms is the constant change of contact persons throughout a project. At ST2, we believe in the value of a personal touch. The expert who designs your control system is often the same person you will see on site during commissioning. This continuity eliminates misunderstandings and drastically speeds up project delivery times.

Brand independence

Unlike those tied to specific hardware manufacturers, ST2 Srl maintains strict technological independence. Our advice is always based on what is best for your system, not on what we need to sell. Whether it’s Siemens, Schneider, Rockwell or others, our priority is seamless integration.

Clear Language, Practical Solutions

We know that project managers need answers, not complications. We communicate transparently, highlighting risks before they become problems and proposing solutions that take return on investment (ROI) into account.

Choosing ST2 Srl isn’t just about purchasing engineering hours; it’s about investing in the peace of mind that comes with a project completed without any surprises. If you’re looking for a team that combines a holistic approach, technical precision and constant support, ST2 is the answer.

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In an ideal industrial world, every component fits together seamlessly and every piece of software runs without a hitch. In reality, plant managers face daily challenges: a sensor sending incorrect signals, an interface that fails to communicate, or an old control panel that stops responding. At times like these, you don’t just need a designer; you need a troubleshooter.

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‘On-Demand’ Engineering

ST2 Srl has built its reputation not only on large-scale projects, but also on its ability to step in where others stop. Our technical consultancy service comes into play precisely when the unexpected arises:

• Rapid Regulatory Compliance: We help you bring your systems into line with new regulations (such as NIS2 or ATEX regulations) without disrupting your operations.

• Root Cause Analysis: We don’t just repair the damage; we investigate why it happened to prevent it from happening again.

• Control Loop Optimisation: If your process is unstable, we recalibrate the automation logic to restore the plant to maximum efficiency.

Why experience counts for more than theory

Solving a complex technical problem requires a mental library of situations encountered before. With over 1,300 projects under their belt, the engineers at ST2 Srl have tackled almost every conceivable scenario in critical sectors such as Oil & Gas, Water Treatment and the Marine Industry.

This ‘historical memory’ enables us to:

1. Reducing diagnosis times: We know where to look before anyone else does.
2. Proposing practical solutions: We aim for a solution that minimises plant downtime and costs.

A good engineering partner proves its worth when you need it most. ST2 Srl isn’t just the firm that designs your next plant; it’s a team of experts ready to analyse, refine and upgrade your existing systems. Because the continuity of your production is our most important measure of success.

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Many excellent engineering projects fail at the final stage: the construction site. The disconnect between the design office and the operational reality can lead to delays and malfunctions. In this guide, we explore how ST2 Srl’s Supervision and Testing service ensures that every cable, sensor and electrical panel meets the required performance standards.

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Stage 1: Supervision of the Assembly

Supervision is not merely a visual inspection, but the active coordination of the workforce.

• What we do: We check that the installation strictly adheres to the P&IDs and detailed drawings.
• The benefit: We identify physical interference or positioning errors before they become a structural problem, saving days of corrective work.

Stage 2: Inspections and FAT (Factory Acceptance Test)

Before a component arrives on site, it must be tested at the source.

• The benefit: We prevent defective or non-compliant materials from reaching the site, thereby eliminating the shipping costs associated with returns or on-site repairs.
• What we do: ST2 technicians visit suppliers to carry out rigorous functional tests on electrical switchboards and control systems.

Stage 3: SAT (Site Acceptance Test) and Commissioning

The moment of truth has arrived: commissioning.

• What we do: We test the entire system under real operating conditions, verifying the safety logic (ESD) and the stability of the control loops.
• The benefit: We ensure a smooth, safe system start-up, free from vibrations or unexpected alarms.

The 3 Key Benefits for the Customer

• Quality Certification: Upon completion, the client receives accurate “as-built” documentation, which is essential for future maintenance and insurance purposes.
• Reduced downtime: Professional commissioning drastically reduces downtime during start-up.
• Single Point of Responsibility: Having the person who designed the system present during the commissioning phase eliminates the passing of the buck between designers and installers.

Field Engineering acts as the link between concept and production. With ST2 Srl, the construction site ceases to be a place of uncertainty and becomes the place where engineering comes to life with pinpoint precision.

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In the Oil & Gas sector, the Wellhead Control Panel (WHCP) is not merely a control panel, but the last line of defence between reservoir pressure and plant safety. The engineering challenge faced by ST2 Srl concerns not only automation, but the perfect synergy between electronic logic and hydraulic power in extreme environments.

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Managing high pressure

The distinctive feature of the WHCPs designed by ST2 lies in their ability to handle pressures exceeding 10,000 psi. The technical article should explore:

• Single-line and dual-line circuits: How we design redundancy to ensure that safety valves (SSV, SCSSV) close even in the event of a total power failure.
• Pneumatic-Hydraulic Integration: The ability to link low-pressure logic signals with high-power hydraulic actuators, ensuring rapid response times (Emergency Shut Down).

Design based on the Safety Integrity Level (SIL)

It is not simply a matter of getting a panel to ‘work’, but of certifying its reliability. ST2 develops WHCP engineering in accordance with the rigorous IEC 61508/61511 standards. This involves analysing every single component, from manual pumps to solenoid valves, to minimise the probability of failure on demand (PFD).

Customisation for offshore and onshore environments

Every well presents different challenges. ST2 stands out for its ability to design bespoke solutions:

• Solar power systems for installation in remote areas (desert conditions) where there is no mains electricity supply.
• 316L stainless steel enclosure designed to withstand marine corrosion in offshore environments.

WHCP engineering lies at the intersection of heavy machinery and precision automation. Choosing ST2 Srl for these systems means selecting a partner who understands the critical nature of every single connection and the responsibility behind every line of safety logic.

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In an era of ecological transition and fluctuating energy costs, the challenge for industry is not merely to build new plants, but to make existing ones more efficient. Much of the infrastructure still operates using outdated control systems which, as well as being difficult to maintain, waste energy and resources. The technological revamp proposed by ST2 Srl is the key to combining sustainability with profitability.

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Why revamping is the sustainable choice

Replacing an entire plant has a huge environmental and economic impact. Targeted revamping of E&I systems, on the other hand, makes it possible to:

• Reduce the carbon footprint: By optimising process cycles and reducing energy waste through new control algorithms.

• Extend the asset lifecycle: Upgrading electrical panels and field instrumentation helps avoid the premature scrapping of large machinery.

• Improve safety: The integration of modern safety systems (SIL) protects the environment from potential spills or operational incidents.

The ST2 approach: Diagnosis before treatment

Every energy optimisation project at ST2 begins with a detailed feasibility study. We do not simply replace old components with new ones; instead, we analyse process data to identify where energy is being wasted.

Whether it’s a combined heat and power plant or a water treatment pumping station, our engineering team aims to implement automation systems that regulate loads in real time, ensuring that every kilowatt is used to its full potential.

Integration and business continuity

One of the main concerns for companies is plant downtime during upgrade work. Drawing on our experience in supervising installation and commissioning, we design ‘precision’ revamping projects, minimising downtime and ensuring a smooth transition from the old to the new control systems.

Energy efficiency is no longer merely a regulatory requirement, but a cornerstone of industrial competitiveness. Through precision engineering, ST2 Srl transforms obsolete systems into models of efficiency, demonstrating that environmental sustainability necessarily depends on intelligent and informed automation.

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In the complex landscape of modern industrial plants – spanning sectors from Oil & Gas and Power Generation to water treatment – the success of a project is not determined amongst the scaffolding on site, but long before that, at the drawing board. The Front-End Engineering Design (FEED) phase lies at the heart of the engineering vision: it is the stage at which operational requirements are transformed into technical specifications and where risks are mitigated before they can turn into costly variations.

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FEED: Why it is an investment and not just a cost

• The illusion of savings: Treating FEED as a mere ‘formality’ is the mistake that ruins projects. Rushing straight to the construction site without a solid engineering foundation guarantees delays.
• The leverage effect: FEED accounts for only a small fraction of the budget, but the decisions made at this stage determine 80% of the final costs.
• The domino effect: An error in the control systems (E&I) does not remain on paper: it comes to light during installation, causing major changes and work stoppages.
• The ST2 guarantee: We don’t just produce drawings, we create a:
  1. Secure the budget (no surprises on purchases).
  2. Guarantee the schedule (smooth installation).

E&I: From technical precision to supplier selection

In the E&I (Electrical and Instrumentation) sector, a thorough FEED enables the following to be defined with surgical precision:

• Schematic diagrams and high-level layouts.
• Control philosophies and system architecture.
• Specifications for critical components such as WHCPs or electrical panels.

This level of detail is not only essential for ‘good design’, but is also crucial for the tender evaluation stage. Having flawless technical specifications allows suppliers to be compared on a level playing field, thereby avoiding technical surprises during the procurement of materials.

ST2’s multidisciplinary approach

The real challenge with large-scale plants is integration. ST2 Srl’s strength lies in its ability to manage multidisciplinary contracts. We do not simply provide electrical or automation engineering in isolation from the rest; we work actively to ensure our solutions are fully aligned with mechanical and civil engineering requirements.

The real challenge with large-scale plants is integration. ST2 Srl’s strength lies in its ability to manage multidisciplinary contracts. We do not simply provide electrical or automation engineering in isolation from the rest; we work actively to ensure our solutions are fully aligned with mechanical and civil engineering requirements.

Is your E&I design truly variation-proof? Rely on ST2 Srl’s FEED engineering to define flawless technical specifications, optimise tender documentation and ensure a seamless transition from design to implementation.

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