FM-7745 Explained: What the Certification Actually Tests and Why Specifiers Should Care

If you've ever read a spec sheet for hydrocarbon leak detection and seen "FM-7745 approved" listed as a requirement, you've probably wondered what that actually means. Most engineers know the name. Far fewer can tell you what the standard tests, why those tests exist, or how to tell the difference between a product that genuinely meets the intent and one that just carries the line on a brochure.

This piece pulls back the curtain on FM-7745 — the testing, the surveillance, the language inside the standard that matters most, and what specifiers should look for when comparing systems.

What is FM-7745?

FM-7745 is the FM Approvals standard for liquid leak detectors. When it was first published in 2009 it focused on diesel fuel detection. In 2012 it was expanded to a broader range of hydrocarbon liquids — gasoline, jet fuel, hydraulic fluids, motor oils, transformer oils, heating oil. The 2021 revision added water leak detectors and restructured the document into distinct application categories. Today it is titled "Liquid Leak Detectors" and covers, separately, hydrocarbon detectors for above-ground installations, hydrocarbon detectors for below-ground installations, water leak detectors, water detectors based on usage-pattern monitoring, and water detectors for roof assemblies.

That last detail matters for specifiers. An approval for an above-ground hydrocarbon application is not automatically an approval for a below-ground one. The standard treats those as different problems.

FM Approvals is the certification arm of FM, the commercial property insurer formerly known as FM Global. (The company rebranded to "FM" in July 2024.) That parentage matters more than people realize. The standard exists because insurers wanted a way to verify that a leak detection product would actually do what its data sheet promised — fast enough to prevent a loss, reliably enough to avoid nuisance shutdowns, and durably enough to keep working in real installations.

A product carrying the FM-7745 mark has been through performance testing, a factory examination, a quality system audit, and is enrolled in an ongoing surveillance program. It isn't a one-time stamp. FM auditors come back.

What does FM-7745 actually test?

The certification is a package, not a single test. Here is what is actually inside it.

Response time. The headline requirement is that the detector must alarm within 30 seconds of contact with the specified hydrocarbon liquid. Thirty seconds is not arbitrary. It is the window between an early indication and an event that has already escalated — fuel reaching a storm drain, vapor accumulating in a confined space, a transformer fire taking hold. If a sensor needs five minutes to respond, the leak is no longer just a leak.

Sensitivity. FM tests detection against the manufacturer's own claimed minimum sensitivity, under three different conditions — leaks on a dry floor, a thin film floating on water, and varying water depths. A sensor that responds quickly on a dry concrete pad but misses a film floating on rainwater will not pass. This is a more rigorous scenario than most people picture, because real installations are rarely dry. Tank farms see rain. Containment areas pool water. Sumps stay wet.

Specific liquid certification. This is the part most spec writers miss. A product is approved for the particular hydrocarbon liquids it was tested against. A unit certified for diesel is not automatically certified for gasoline, jet fuel, or transformer oil. When you see "FM-7745 approved" on a data sheet, the right question is: approved for which liquids?

Environmental durability. Beyond the headline sensitivity and response tests, FM subjects detectors to a broad set of environmental stresses — vibration, corrosion, voltage variation and surges, dust ingress, temperature extremes, humidity, and static discharge — and supervises the system across various failure modes. This is the quiet half of the standard. A sensor that alarms in 25 seconds in a clean lab but stops working after six months on a vibrating skid in a humid coastal facility is the failure mode the durability tests are designed to catch.

Hazardous location compatibility. FM-7745 does not stand alone for installations in classified areas. It works in conjunction with the hazardous location standards — FM 3600 for general electrical equipment in classified locations, plus the relevant intrinsic safety and enclosure-rating documents. A sensor going into a Class I Division 1 zone has to satisfy both sets of requirements. Notably, FM Approvals is the only Nationally Recognized Testing Laboratory that combines performance testing against manufacturer-specified hydrocarbon targets with hazardous location certification in a single program. Passive sensor designs and properly barriered acquisition modules are the usual way to handle the field installation.

Marking. The standard specifies how an approved product must be labeled. This sounds bureaucratic but it is how installers and inspectors verify in the field that a given piece of hardware actually matches the approval.

Manufacturing examination. FM reviews the factory where the product is made — production processes, change control, traceability. The point is to confirm that the unit on your loading dock was built the same way as the unit that passed the test.

Quality assurance audit. The manufacturer's quality system is audited at certification and on a recurring basis. If the quality program slips, the approval can be withdrawn.

Follow-up surveillance. This is the piece that separates a real third-party approval from a marketing claim. FM returns periodically to confirm that nothing has drifted — same components, same processes, same performance.

Why the 30-second alarm requirement matters more than it looks

A lot of detection technologies can eventually identify a leak. The 30-second clock is what separates protection from documentation. Anything slower captures the leak after the loss has already happened.

Consider a rooftop diesel day tank above a hospital. A slow drip behind a fitting at 2 a.m. The difference between a 30-second alarm and a 10-minute alarm is the difference between a maintenance call and a fuel-soaked roof membrane, a closure order, and an environmental claim. The standard codifies what insurers have learned the hard way: speed is the asset.

Why "approved for the specific liquid" is the line specifiers miss

Here is a real-world failure mode. A facility specifies an FM-7745 approved sensor because the spec calls for it. The sensor is approved for diesel. The installation is around a transformer using mineral oil, or a process line carrying jet fuel, or a generator that was converted to renewable diesel during a fuel program update. The sensor may still respond — or it may not. The approval does not cover the substance present.

When evaluating a quote, look at the certification listing, not the marketing line. Confirm the specific hydrocarbons the unit was tested against, and confirm those match what is actually in the tanks, pipes, and containment areas it is protecting. If your operation handles multiple hydrocarbons, you want a product family with broad liquid coverage in its approval rather than a single-fuel device.

Common misconceptions worth correcting

A few things come up over and over in conversations with engineers and procurement teams.

"FM Approved and UL Listed mean the same thing." They do not. Both are respected, but they use different test protocols, different scopes, and different surveillance regimes. A product can hold one and not the other. FM-7745 in particular is unusual in pairing performance testing against specific target liquids with hazardous location certification — a combination not all NRTL programs offer.

"If the data sheet says FM-7745, the whole system is approved." Not necessarily. Approval applies to specific model numbers, often a defined combination of sensor, acquisition module, and controller. Substitute an unapproved component and the system, as installed, is no longer the approved configuration.

"All hydrocarbon sensors respond about the same." Performance varies a great deal once you leave laboratory conditions. Cold temperatures slow some chemistries dramatically. Water immersion confuses others. Heavy oils do not behave like light fuels. The FM tests — sensitivity plus the environmental stress battery — exist precisely because data sheets do not survive contact with a tank farm.

"Approval is forever." It is not. Surveillance audits can withdraw an approval. Always check the current FM Approval Guide listing, not a brochure printed three years ago.

"An above-ground approval covers below-ground use." Since the 2021 revision, the standard treats these as separate application categories with their own testing. A sump or vault application needs a listing that explicitly covers below-ground use.

Five questions to ask when reviewing an FM-7745 spec

These five questions cover most of what matters.

1. Which specific hydrocarbon liquids is the product approved to detect, and do those match the fluids on site?
2. Which components — sensor, module, controller — are covered, and is the proposed system the approved configuration?
3. What is the manufacturer's stated response time, and does it hold across the temperature, humidity, and vibration range of the installation?
4. Is the sensor reusable after exposure, or does the protected area become unprotected after the first event?
5. How is the system installed in hazardous locations — passive sensor with a Zener barrier, intrinsically safe field box, or something else — and does the approval cover that arrangement and the above-ground or below-ground application?

If a vendor cannot answer those quickly and clearly, that is a signal.

How Naftosense approaches FM-7745

The Naftosense FM-7745 approved line was designed around the realities behind the standard, not just the marketing benefit of carrying it. The approved controllers, sensor cables, and point sensors detect a broad range of refined fuels and oils — gasoline, diesel, jet fuel, motor and lube oils, transformer oils — within the required 30-second window, across a wide temperature range. The sensors are passive and safe for hazardous locations when wired through the appropriate Zener barrier or intrinsically safe field box. They are cleanable and reusable after a leak event, which means a single incident does not leave a section of the facility unprotected while replacement parts are sourced. And every Naftosense product carries a 10-year factory warranty.

The intent behind FM-7745 — fast, reliable, specific, durable detection in real environments — is the same brief these products were built to satisfy.

If you are writing a specification, comparing quotes, or auditing an existing installation, the move is to look past the logo. Read the approval listing. Ask the five questions above. The standard rewards the engineers who actually use it.

Pipeline Expansion Is Up. So Is the Compliance Bar. Here's How Naftosense Helps

If you work anywhere near oil and gas, you've probably noticed two things happening at once. The broader push around hydrocarbons is leaning toward expansion — more drilling, more transportation, more throughput to keep up with demand that just keeps climbing. At the same time, the rules governing how that product moves through a pipe are being rewritten, and the direction is more nuanced than the deregulation headlines suggest.

That nuance trips a lot of operators up. Pipeline safety sits in its own lane, and after years of operating under an expired authorization, Congress is finally moving to reauthorize and modernize the program — tightening some areas while streamlining others.

That's where Naftosense fits in. Naftosense is a PHMSA-compliant system built specifically to help liquid pipeline operators meet their compliance obligations — every line, every audit, every reporting cycle.

What is PHMSA, and why does it matter for liquid pipelines?

PHMSA stands for the Pipeline and Hazardous Materials Safety Administration. It's the federal agency, sitting inside the U.S. Department of Transportation, that writes and enforces the safety rules for the country's pipeline network and for hazardous materials in transit.

Its mission is straightforward: protect people and the environment by making sure energy and hazardous materials move safely. To do that, PHMSA sets national standards, runs enforcement, conducts research, and partners with state inspectors who handle the bulk of on-the-ground oversight — roughly 85% of the inspection and enforcement workload.

If you operate a liquid pipeline in the U.S. — crude, refined products, NGLs, CO2, anhydrous ammonia, anything in that family — PHMSA is the agency you answer to.

Why is pipeline safety reauthorization a big deal right now?

Because PHMSA has been operating without a current authorization since the PIPES Act of 2020 expired in late 2023. For more than two years, the agency has run on annual appropriations while Congress worked through what the next chapter should look like.

That chapter is now taking shape. The Pipeline Safety Authorization Act of 2026 is a five-year reauthorization currently moving through Congress, and for liquid pipeline operators it brings real changes worth tracking.

Are pipeline regulations getting stricter, looser, or both?

Honestly — both, depending on where you look.

The current reauthorization draft pulls in two directions at once:

• Stricter where it counts on enforcement. The bill proposes tougher penalties for safety violations, expanded voluntary information-sharing across operators, and stronger state damage-prevention requirements tied to the leading cause of pipeline incidents.
• Streamlined where rules have piled up. The same draft removes regulations deemed duplicative and is positioned by its sponsors as making PHMSA more efficient and predictable.

There's also legitimate political disagreement embedded in the bill. Some lawmakers argue it doesn't go far enough on areas like CO2 pipeline rulemaking and methane leak detection. Enforcement posture under the current administration has also been mixed in practice. So the picture isn't a clean "tightening" or "loosening" — it's a modernization, and the operators who track the details will be better positioned than the ones who don't.

What is clear: the country is moving more energy through more miles of pipe than ever, and the safety framework is being rebuilt to keep pace. Expect more scrutiny on the things that matter most to PHMSA's mission.

What does PHMSA compliance actually require for liquid pipelines?

At a high level, liquid pipeline operators have to demonstrate that they're managing their assets safely across the full lifecycle. That includes:

• Integrity management and ongoing risk assessment
• Leak detection capabilities and response readiness
• Operator qualification and training records
• Accurate, timely incident and accident reporting
• Public awareness and damage-prevention coordination
• Recordkeeping that holds up under inspection

The catch is that a lot of this lives in spreadsheets, email threads, scattered PDFs, and tribal knowledge. When an inspector shows up, or when reauthorization brings new requirements online, that fragmentation is where operators get burned.

How does Naftosense help?

Naftosense is built to take the friction out of PHMSA compliance for every liquid pipeline operator — from a single right-of-way to a multi-state network.

The system is designed around what compliance teams actually need to do day to day:

• Centralize the record. Every document, inspection, qualification, and incident in one auditable place. No more digging through inboxes the night before a review.
• Stay aligned with PHMSA standards by design. The platform is built to PHMSA's framework, so the workflows you run match the rules you're being measured against.
• Get ahead of inspections. Real-time visibility into where your program stands means surprises stop being surprises.
• Adapt as the rules change. With reauthorization moving forward and stricter penalties on the table, having a system that absorbs new requirements without starting from scratch is the difference between scrambling and operating.

The point isn't to add another tool to the stack. The point is that PHMSA compliance is being modernized, and the operators who handle that transition well are the ones who treat compliance as an operating system rather than a fire drill.

The bottom line

Pipeline expansion is real. The energy demand driving it is real. And after more than two years of operating under an expired authorization, PHMSA's pipeline safety program is finally being rebuilt for the next five years — with stronger penalties in some places, streamlined rules in others, and modernized expectations across the board.

If you run liquid pipelines, the safer assumption is that compliance is going to demand more discipline, not less. Stricter enforcement on the violations that matter. Cleaner recordkeeping. Faster reporting. Better coordination with state programs.

Naftosense exists so that operators don't have to choose between moving product and meeting the rules. It's a PHMSA-compliant system that helps every liquid pipeline keep up with what's required today and what's coming next.

If pipeline safety reauthorization is on your radar — and it should be — this is the right time to make sure your compliance foundation is built for it.

Why Your Fuel Leak Sensors Are Missing Ethanol — And What to Do About It

Naftosense | Industry Insights

Environmental Protection

Why Traditional Leak Detection Fails for Ethanol — And What Actually Works

Most fuel leak sensors were built with gasoline in mind. But ethanol plays by entirely different rules. Here's why that matters, and how a purpose-built detection system finally closes the gap.

Naftosense  ·  Oil & Gas Environmental Compliance  ·  7 min read

If you manage fuel storage or transfer operations, you already understand the importance of leak detection. You have systems in place. You have sensors in your sumps. You run regular checks. So it might come as a surprise to learn that when it comes to ethanol specifically, most of those systems are essentially flying blind.

That's not a knock on your operations — it's a chemistry problem. Ethanol behaves in a fundamentally different way than the fuels traditional sensors were designed to catch. Understanding that difference is the first step toward actually fixing it.

The Chemistry Problem Nobody Talks About Enough

Traditional fuel leak detectors work on a simple principle: hydrocarbons float on water. When gasoline or diesel leaks into a sump or containment area, it sits on top of any water present. Sensors designed to detect a hydrophobic layer on a water surface work well for exactly that scenario.

Ethanol, however, is miscible with water. That's a fancy way of saying it mixes completely and doesn't separate. When ethanol leaks, it doesn't pool on the surface — it dissolves right in. For a sensor looking for a floating hydrocarbon layer, there's nothing to detect. The leak goes unnoticed while the contaminated water continues to spread.

"When ethanol leaks, it doesn't pool on the surface — it dissolves right in. For a sensor looking for a floating hydrocarbon layer, there's nothing to detect."

This creates a compounding problem underground. Ethanol's water solubility means contamination can migrate farther and faster through soil and groundwater than a conventional gasoline spill would. By the time the issue is discovered through traditional monitoring methods, the affected area can be significantly larger than it would have been otherwise.

Why Ethanol Is Everywhere Now — And Why That Raises the Stakes

This issue has become much more urgent in recent years because ethanol is no longer a niche product. Government blending mandates have pushed ethanol into the mainstream fuel supply at scale. Today, virtually every gallon of gasoline sold in the United States contains a meaningful percentage of ethanol, typically around ten percent, with higher blends increasingly common in certain markets.

That means refineries, blending terminals, pipeline systems, and fuel storage facilities are all handling ethanol in volumes they simply weren't a decade ago. The infrastructure wasn't always built with this in mind, and neither were the monitoring systems installed alongside it.

Regulators have taken notice. Environmental agencies treat ethanol leaks seriously, in part because of the groundwater migration risk described above. A leak that might once have been contained and remediated relatively quickly can turn into a protracted, expensive environmental response when ethanol is involved. The reputational and financial consequences of a missed detection event are real.

Where Leaks Actually Happen

Ethanol moves through a long chain before it reaches a consumer's fuel tank. It's produced, transported by rail or truck, received at blending terminals, stored in bulk tanks, measured and blended, then transferred into distribution pipelines and tanker trucks. Each one of those handoffs — every pump, fitting, valve, pipe joint, and tank seal in that chain — is a potential leak point.

The challenge isn't just detection at any one facility. It's consistent, reliable monitoring across every node of a complex distribution network, in environments ranging from climate-controlled blending rooms to outdoor storage areas exposed to rain, temperature swings, and condensation. Any detection system has to work reliably across all of those conditions without generating constant false alarms that erode operator trust.

The Naftosense Approach: Built for Ethanol, Not Adapted for It

The Naftosense FLD system was engineered from the ground up for this specific challenge. Rather than retrofitting a hydrocarbon sensor with additional capabilities, the technology is designed to detect alcohols and polar solvents as its primary function — with sensitivity to fossil fuels and hydrocarbons as a secondary benefit.

The system is configured to reliably detect ethanol at concentrations of 20 percent by volume in water. That threshold matters because regulators generally treat concentrations at or above that level as a reportable concern. Below 20 percent, ethanol contamination is typically not considered a regulatory event. The Naftosense system is tuned to the exact threshold that matters for compliance, so operators get actionable information rather than noise.

The Three Core Components

Sensing

FLD-PSP Probe

A fully encapsulated, high-performance sensing probe installed directly in sumps, containment areas, and low points. Factory-installed in a stainless steel slotted tube for protection and consistent positioning.

Acquisition

FLD-MXM-PS Module

The field-level acquisition module that interprets probe signals with intelligent thresholding. Built-in algorithms track electrical conductivity between sensor wires to minimize false positives from condensation, dust, and conductive dirt.

Control

FLD-SMP Controller

The master control module connecting the field system to facility infrastructure. Supports Modbus RTU and 4–20 mA outputs for direct integration with SCADA and PLC systems. Covers wired layouts up to one mile.

Detection Speed: What the Numbers Look Like

One question operators always ask is how fast a detection system responds once a leak occurs. The answer varies depending on what's leaking and the ambient conditions, but the Naftosense FLD-PSP probe delivers response times that are practically useful for real-world operations.

Substance	Typical Detection Time
20%–100% alcohol in water	2 to 2.5 minutes
Gasoline and other hydrocarbons	30 seconds to 10 minutes
Hydrocarbon vapors	3 to 4 minutes

A detection time of two to two and a half minutes for alcohol in water means operators can respond before a small leak becomes a large one — and well before regulators become involved.

The False Positive Problem (And Why It's Solved Here)

Here's a situation any operator with field experience will recognize: you install a sensitive detection system, and then you spend the next six months responding to nuisance alarms triggered by condensation, morning dew, cleaning water, or conductive dust settling on sensor surfaces. Eventually, operators start ignoring alarms. At that point, the detection system is worse than useless — it creates a false sense of security while providing no real protection.

The FLD-MXM-PS module addresses this directly with what Naftosense calls intelligent thresholding. The module continuously monitors electrical conductivity between sensor wires and uses a built-in algorithm to distinguish between the conductivity signature of a genuine ethanol or solvent leak and the conductivity patterns associated with environmental factors like condensation and dust. Alarm thresholds are adjustable from the monitoring panel, allowing facilities to tune sensitivity to their specific operating environment.

The result is a system that operators can trust. When an alarm triggers, it means something real has happened. That's the foundation of effective environmental compliance — not just detection capability, but detection reliability.

Integration With Existing Infrastructure

One practical concern for any new monitoring system is how it fits into existing facility infrastructure. Most industrial facilities already have SCADA or PLC systems managing a wide range of operational parameters. Adding a new monitoring technology only makes sense if it can report into those existing systems cleanly, without requiring parallel infrastructure or manual data transfer.

The Naftosense FLD system supports both Modbus RTU and 4–20 mA output interfaces, which are the two most common communication standards in industrial control environments. That means alarm data flows directly into whatever monitoring platform the facility already uses. Latching alarms with push button reset give operators clear, unambiguous status information, and alarms can also be reset remotely through a Modbus command when that's more practical. Zener barriers enable safe installation in C1D1 classified locations where many ethanol handling operations take place.

A 10-Year Warranty Worth Noting

Industrial sensors installed in harsh environments face real durability demands. The FLD system comes with a ten-year warranty — a meaningful commitment for equipment that may be buried in sumps or installed in containment pits and expected to perform reliably for years without active maintenance.

The Bottom Line

Ethanol isn't going away. If anything, its role in the fuel supply is growing. For operators handling ethanol at any point in the production and distribution chain, the question isn't whether ethanol-specific leak detection matters — it's whether your current system is actually capable of providing it.

If your detection infrastructure was installed primarily with hydrocarbon fuels in mind, there's a meaningful gap in your environmental monitoring coverage. The Naftosense FLD system was built to close exactly that gap, with technology that treats ethanol detection as a first-class problem rather than an afterthought.

To learn more or to discuss the right configuration for your facility, visit www.naftosense.com or call (800) 774-5630.

Ready to Close the Gap in Your Ethanol Monitoring?

Talk to a Naftosense specialist about the right FLD configuration for your facility.

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© Naftosense  ·  Ethanol Leak Detection for Environmental Protection in Oil & Gas

Executive Summary: Getting Ahead of Leaks & Spills — Naftosense White Paper

Get the full "Getting Ahead of Leaks & Spills" white paper here.

Leaks in pipelines, storage tanks, and industrial systems present significant operational, environmental, and financial risks. Traditional detection methods — visual inspections, pressure monitoring, and infrared sensing — often fall short in terms of accuracy, speed, and cost-effectiveness. This white paper, authored by Naftosense R&D coordinator Stefan Balatchev, presents polymer absorption sensors as a modern, real-time alternative capable of detecting hydrocarbons and other chemicals with high sensitivity across a wide range of industrial applications.

Technology Overview

Polymer absorption sensors operate through three core mechanisms: selective polymer materials with high chemical affinity, physical absorption that causes measurable changes in the polymer (e.g., expansion, viscosity, dielectric properties), and signal conversion via optical, electrical, or mechanical means — most commonly via changes in electrical resistance or capacitance.

Key Applications

The technology is applicable across a broad industrial landscape, including oil and gas pipelines (particularly at block valves and pig launchers), above-ground and underground storage tanks, offshore platforms and subsea pipelines, and refineries and chemical processing plants. Notably, the sensors also support emerging energy sectors, detecting leaks of ethanol, methanol, biodiesel, sustainable aviation fuel (SAF), and liquid organic hydrogen carriers (LOHC) — positioning Naftosense as relevant to the energy transition, not just legacy fossil fuel infrastructure.

System Integration

Naftosense hardware pairs with the Lindsay SentraLink LD platform to deliver a comprehensive monitoring solution. This combination provides 24/7 web-based dashboard visibility, remote accessibility via cellular or satellite communication, battery-powered off-grid operation, and automated email/text alerts. The integrated system is designed for deployment in pipelines, tank farms, refineries, and produced water sites.

Core Value Proposition

The system can detect leaks as small as 1 ounce of product, enabling rapid response before minor incidents escalate into major environmental or operational events. Its durability, low maintenance requirements, and adaptability to harsh environments — including deep-sea conditions — make it a compelling solution for both conventional and challenging deployment scenarios.

Conclusion

Naftosense's polymer absorption sensors, combined with complementary monitoring platforms like Lindsay SentraLink LD, offer a reliable, scalable, and forward-looking approach to leak detection. The solution addresses growing regulatory pressure, aging infrastructure, and the evolving demands of new fuel technologies, making it a strong candidate for organizations seeking to proactively protect their infrastructure and minimize environmental liability.

FM7745-Approved Leak Detection: Naftosense's Approach to Loss Prevention

FM Global stands apart among commercial insurers because it focuses on preventing losses rather than simply paying claims. Through its testing and certification arm, FM Approvals, the organization defines performance standards that help facility owners detect risk earlier, limit damage, and keep critical operations running. One of the most important of these standards is FM7745, a performance-based standard that addresses leakage of water and hydrocarbons inside buildings. The intent is straightforward but powerful: identify leaks quickly, communicate that information to building management systems, and, when appropriate, trigger automatic responses that stop the release before it escalates into fire, environmental damage, or extended downtime.

FM7745 applies across an unusually wide range of industries because hydrocarbons and water are present in so many mission-critical systems. Hospitals depend on emergency generators, day tanks, fuel conditioning skids, and extensive piping networks that often run above ceilings or below floors. Data centers rely on large backup power systems with stored diesel fuel, transfer pumps, and distribution piping that must operate flawlessly under emergency conditions. Commercial buildings and manufacturing facilities introduce additional exposure through boilers, fuel-fired equipment, bulk storage vessels, underground piping, and mechanical rooms with dense concentrations of utilities. FM7745 is designed to verify that leak detection systems used in these environments perform reliably under real-world conditions, including sensitivity to small leaks, resistance to false alarms, and compatibility with automated controls.

Meeting FM7745 requirements means more than simply sensing the presence of liquid. Approved systems must demonstrate repeatable detection of both water and refined hydrocarbons, predictable response times, and stable operation when integrated into supervisory control or building automation platforms. The standard places emphasis on early warning rather than catastrophic failure, because FM Global recognizes that a slow, undetected leak often causes more damage over time than a dramatic single event. Early detection allows facility teams to correct issues while systems remain operational and before fuel vapors, corrosion, or environmental contamination create secondary hazards.

This is the operating philosophy behind Naftosense, a company that originated in demanding oil and gas environments where leaks rarely announce themselves loudly and conditions are rarely forgiving. Drawing on that background, Naftosense engineered an FM7745-approved leak detection system specifically for FM Global-insured facilities that need precision without compromise. The system scales smoothly from a single sensing point protecting a day tank or generator enclosure to expansive, distributed networks that run through long pipe corridors, containment zones, and equipment rooms. Throughout that scaling process, the design maintains the same priorities that governed its industrial roots: rapid response, mechanical durability, and consistent accuracy.

At the heart of the Naftosense system is a rope-style sensing element that behaves very differently from point sensors or float-based probes. Instead of waiting for liquid to pool at a single location, the rope sensor monitors extended linear paths where leaks are most likely to occur. When refined fuel contacts the sensing element, the system registers the change almost immediately. In controlled testing and real installations, it can detect extremely small volumes of refined hydrocarbons in under 30 seconds. That response time matters, because even modest diesel or fuel oil leaks can spread invisibly along floors, cable trays, or pipe racks before anyone notices an odor or visible sheen.

Accuracy alone does not satisfy FM7745 requirements if it comes at the cost of operational nuisance, and this is where system design becomes critical. Naftosense sensors are engineered to resist false alarms caused by humidity, condensation, cleaning solutions, or transient environmental changes. The sensing element focuses on the chemical signature of refined fuels rather than general conductivity or moisture, which allows facilities to run the system continuously without constant recalibration or alarm fatigue. That stability is essential in healthcare, data center, and manufacturing settings where alarms trigger formal response procedures.

Integration with building management and control systems further strengthens the value of an FM7745-approved solution. When the Naftosense controller detects a leak, it can immediately report the event to a central monitoring platform, providing clear location data that guides maintenance teams directly to the source. In configurations that include actuated valves, the system can also initiate rapid isolation of the affected section, limiting the amount of fuel released and reducing cleanup costs. This coordinated response aligns closely with FM Global’s loss prevention model, which favors fast, automated intervention backed by human oversight.

Long-term reliability also plays a role in risk management and return on investment. Naftosense uses cleanable, reusable rope sensors that return to service after remediation rather than requiring disposal and replacement. That approach reduces lifecycle costs and avoids the gaps in protection that often occur when consumable sensors are temporarily out of stock or overlooked during maintenance. A 10-year factory warranty across the entire leak detection system reinforces confidence that the equipment will perform as intended over the long operating life expected in insured facilities.

For facility owners and risk managers, the practical benefits of an FM7745-approved Naftosense installation are easy to quantify. Faster leak detection reduces secondary damage to structures, electrical systems, and finished spaces. Early intervention minimizes environmental exposure and fire risk associated with flammable fuels. Clear communication with building systems supports documented compliance and simplifies inspections. Over time, these outcomes help FM Global-insured clients demonstrate strong loss prevention practices, protect their staff and occupants, and potentially reduce insurance premiums tied to verified risk reduction.

In an era when facilities are expected to operate continuously and safely under increasing scrutiny, FM7745 sets a meaningful benchmark for leak detection performance. Naftosense meets that benchmark with a system built on industrial experience, engineered sensitivity, and practical durability, delivering early warning where it matters most and turning leak detection from a reactive safeguard into an active component of facility resilience.

Merry Christmas and Happy New Year from Naftosense

Advanced Leak Detection Technology for Oil & Gas Operations

Protect Your Infrastructure with Real-Time Hydrocarbon Monitoring

Naftosense's latest white paper reveals how cutting-edge polymer absorption sensors are revolutionizing leak detection across the oil and gas industry. Traditional methods like visual inspections and pressure monitoring often fall short—but this innovative solution offers unprecedented sensitivity and reliability.

What's Inside:

Revolutionary Technology – Learn how selective polymer materials detect hydrocarbons through absorption mechanisms that trigger measurable electrical property changes, enabling real-time leak detection with exceptional accuracy.

Wide-Ranging Applications – Discover how these sensors protect critical infrastructure, including:

• Pipeline routes and block valves
• Underground and floating-roof storage tanks
• Offshore platforms and subsea pipelines
• Refineries and chemical processing plants

Future-Ready Solutions – Explore applications for emerging low-carbon fuels like ethanol, methanol, biodiesel, and even liquid organic hydrogen carriers (LOHC) for hydrogen energy systems.

Integrated Monitoring – See how Naftosense pairs with Lindsay SentraLink LD to provide 24/7 web-based monitoring, remote accessibility, and instant leak alerts—even in completely off-grid locations.

Key Benefits:

✓ Detects leaks as small as ~1oz of product

✓ Early warning system prevents escalation

✓ Minimal maintenance in extreme environments

✓ Reduces environmental contamination risk

✓ Enhances operational safety and compliance

Download the full technical paper: Getting Ahead of Leaks & Spills

For more information, contact Naftosense at (614) 350-0911