It is widely used in equipment for emergency stop systems and in equipment that must operate regardless of whether a fire occurs.
The Intertech proprietary composite material GRP structure technology allows the shelter to maintain an internal temperature below 60°C for 2 hours, even in the event of a hydrocarbon fire, thanks to the internal core made of rock wool and the external GRP layer. In the jet fire test, when exposed to external heat of 1000°C, it keeps the interior below 60 degrees for 120 minutes (2 hours). 【Application】 In the event of a fire, it is necessary to protect emergency "shutdown" (ESD) valves and their actuators from heat in chemical and petrochemical plants. During an emergency, the actuators must remain operable for at least 15 minutes after the fire starts. It is also possible to maintain operability under more stringent conditions of 30 minutes, 60 minutes, or longer. For these applications, we have developed a fire shelter that has been certified by a third-party organization in compliance with UL 1709, and it is patented. Fire Shelter： https://www.intertec.info/en/products/protective-cabinets-and-shelters/comprehensive-protection-solutions.php#FIRE-SHELTER?navid=553540553540
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basic information
**Features** - Corrosion resistance using GRP (Glass Reinforced Plastic) for both external and internal applications - Custom design and sizing to suit valve and actuator applications - Split base plate to fit around the valve shaft - Support frame designed and supplied at the factory - Complete shelter removal for actuator repair or replacement - Optional access doors and maintenance for service - Standard details for tube and electrical penetrations - Manufactured to meet fire safety standards and time/temperature curve requirements UL1709 - Tested and certified by MPA-Dresden **Description** The shelter is constructed with a special GRP/mineral wool/GRP sandwich design suitable for harsh outdoor environments. These provide excellent resistance, protecting against corrosion and safeguarding valves and actuators from overheating during fires. Additionally, they prevent frost and freezing in cold climates. For inquiries in Japanese, please contact: japan@intertec.info
Price information
Prices may vary depending on the application, installation location, and temperature conditions, so please contact us for more information. For inquiries in Japanese, please contact: japan@intertec.info
Delivery Time
※Delivery times may vary depending on the product, so please contact us.
Applications/Examples of results
We deliver products that provide insulation and heat resistance against fire and high temperatures, as well as UV resistance. We supply our products to the majority of major companies in the oil, gas, chemical, and petrochemical industries.
Detailed information
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INTERTEC-Hess Fire Shelter | Extreme Insulation Technology Using GRP and Mineral Wool Double Sandwich Construction INTERTEC-Hess fire shelters incorporate a special multi-layer double sandwich construction combining GRP (Glass Fiber Reinforced Polyester) and mineral wool (rock wool). The photograph on this slide shows the actual cross-section of this structure, revealing multiple layers of GRP outer skins and mineral wool insulation bonded together. Unlike standard GRP/PU foam constructions, the fire shelter uses mineral wool as the insulation material to achieve a "high-insulation double sandwich construction" that significantly delays heat penetration even in extreme high-temperature fire conditions. Based on a proprietary electrical model design principle that prevents thermal short paths, the construction keeps internal equipment temperatures within a safe range for extended periods, even when the exterior is exposed to flames exceeding 1,000°C.
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INTERTEC-Hess Fire Shelter | Demonstrated Performance in UL1709 Jet Fire Testing: Internal Temperature Held Below 60°C After 90 Minutes at 1,093°C The exceptional insulation performance of INTERTEC-Hess fire shelters has been validated through jet fire testing conducted in accordance with the UL1709 standard. The photographs on this slide show the condition of the shelter after 90 minutes of jet fire exposure. While the left photograph confirms severe charring and damage to the exterior, the right photograph shows the interior remaining in a sound condition. Test results demonstrate that even under the extreme conditions of an external temperature reaching 1,093°C (2,000 K), the body temperature of equipment housed inside the shelter is kept below 60°C. The shelter is adopted as a protection solution for control panels, positioners, and other equipment that conventional intumescent fire coatings cannot adequately protect, with applications in oil & gas and offshore platform environments.
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INTERTEC-Hess Fire Shelter | UL1709 Jet Fire Test: Condition at 5 Minutes After Test StartThis slide shows a photograph documenting the condition of the INTERTEC-Hess fire shelter five minutes after the start of the UL1709 jet fire test. At this stage, the external appearance remains largely intact, demonstrating that the double sandwich construction of GRP and mineral wool is effectively blocking heat ingress in the early phase of the test. The photograph was taken during the test with multiple thermocouple cables attached for temperature monitoring. The shelter subsequently withstands 90 minutes of exposure to 1,093°C flames, with internal equipment temperatures confirmed to remain below 60°C throughout.
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INTERTEC-Hess Fire Shelter | UL1709 Jet Fire Test: Condition at 10 Minutes — External Temperature 1,093°C (2,000 K)This slide shows footage recorded ten minutes after the start of the UL1709 jet fire test. At this point, the external temperature has already reached 1,093°C (2,000 K), and the shelter is completely engulfed in intense high-temperature flames. Nevertheless, the insulation performance of INTERTEC-Hess's double sandwich construction continues to block heat ingress effectively even under these extreme conditions, keeping the internal equipment within a safe temperature range. The test continues for a further 90 minutes, ultimately demonstrating that the internal equipment temperature is maintained below 60°C.
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INTERTEC-Hess Fire Shelter | UL1709 Jet Fire Test: Condition at 45 Minutes After Test Start This slide shows footage recorded 45 minutes after the start of the UL1709 jet fire test. With the entire test chamber engulfed in high-temperature flames and smoke, the INTERTEC-Hess fire shelter can be seen maintaining its form and continuing to perform its fire protection function. Even at the 45-minute mark, the double sandwich construction of GRP and mineral wool is preventing thermal short paths and continuously blocking heat ingress to the internal equipment. The test then continues for a further 45 minutes, with the final result — confirmed at the 90-minute mark — demonstrating that internal equipment temperatures remain below 60°C.
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INTERTEC-Hess Fire Shelter | Post-Test Condition and Demonstrated Equipment Temperature Results After 90-Minute UL1709 Jet Fire Test This slide presents three photographs showing the condition of the fire shelter after completion of a 90-minute jet fire test at 1,093°C in accordance with the UL1709 standard. The left photograph confirms that the exterior has been completely charred and damaged, while the center photograph shows the interior remaining in a sound condition. The right photograph demonstrates that the body temperature of equipment housed in the shelter during the test was maintained below 60°C. These test results confirm that INTERTEC-Hess fire shelters can reliably protect critical instrumentation — including control panels and positioners — in high fire-risk environments such as oil & gas, chemical, and offshore platform facilities.
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INTERTEC-Hess Fire Shelter | Internal Cross-Section of Double Sandwich Construction and Door Seal Design The photograph on this slide shows a top-down view of the interior cross-section of an INTERTEC-Hess fire shelter. Multi-layer sandwich panels of GRP and mineral wool are arranged around the full perimeter of the walls, with a thick seal structure applied at the door. A small inspection hatch is also provided inside to accommodate cable and pipe entry. This design prevents thermal short paths while still enabling the routing of necessary wiring and pipework, achieving long-term protection of internal equipment even under fire conditions.
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INTERTEC-Hess Fire Shelter | Base Panel Cable Entry Design and Details of the Insulation Structure The photograph on this slide shows the base panel of an INTERTEC-Hess fire shelter, with a circular cable and pipe entry opening (gland) provided at the center. The base panel is also constructed using the GRP and mineral wool double sandwich structure, maintaining high insulation performance while accommodating field wiring entry. A uniform seal structure is applied around the panel perimeter, precisely engineered to eliminate any thermal short paths. This base design supports standard cable and instrumentation wiring entry from below.
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INTERTEC-Hess Fire Shelter | Thermal Conductivity of GRP, Insulation Foam, and Mineral Wool: Comparison with Metallic Materials This slide presents a comparative chart of the thermal conductivity values of the materials used in INTERTEC-Hess fire shelters and GRP enclosures. The polyester that forms the base of GRP, insulation foam (PU foam), and glass wool (mineral wool) all exhibit thermal conductivity values approximately 1,000 times (10³) lower than those of metals such as aluminum, stainless steel, and copper. This outstanding insulating property is the fundamental reason why INTERTEC products achieve levels of thermal protection that metal cabinets cannot match, providing the material science basis for long-term protection of instrumentation equipment in fire, high-temperature, and cold climate environments.
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Company information
Protecting internal equipment from environments such as cold, heat, corrosion, and chemical areas. Founded in Germany in 1965, our company has a history of 50 years and has achieved an annual growth of 15%. The reason for this growth lies in our unique GRP material. As experts in GRP material, we manufacture enclosures, cabinets, and shelters, while simultaneously providing heating and cooling systems installed inside. We are a German manufacturer that offers diverse solutions to protect delicate field equipment in chemical plants, petrochemical plants, and other industries worldwide. We protect internal measurement, control, and analysis equipment from environments such as freezing, excessive heat, corrosion, and condensation. All of our products are made from GRP (glass-reinforced polyester) material, which has a very low thermal conductivity, allowing us to maximize the efficiency of cooling and heating systems. 【ISO Certification】 ISO 9001 ISO 14001
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