OPTIMISATION OF INSULATION THICKNESS
Darchem Engineering use Lloyds approved software called “Offtranp” to determine the optimal insulation thickness for each PFP application.
This ensures that adequate insulation is provided to protect the equipment in the fire condition and that the thickness of the insulation is kept to the absolute minimum.
The factors below are input into the “Offtranp” software, which calculates and displays the temperature drop across the insulation after a set period of time during the fire.
- · Type of Fire
- · Duration of Fire
- · Limiting Temperature Rise
- · Relevant ambient and operating temperatures
- · Mass and volume of Equipment
- · Exposed Surface Area
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DARMATT™ PFP LACING METHOD
The Darmatt™ PFP system is fastened together using high quality PVC coated stainless steel wire lacing. This lacing method is simple to apply and provides an extremely durable fastening, ensuring that the panels are secured permanently.
By using this lacing method, the panels can be pulled tight around the equipment in such a way that they take shape around the valve/actuator. Once installed, each panel will retain its moulded shape making future removal/installation quicker and easier. -
DARMATT DESIGN SPECIFICATION
- · Fire Condition - Hydrocarbon Engulfment / Jet Fires up to 180 mins
- · Blast Protection - Up to 1.62 bar
- · Limiting Temperatures – as per project requirements, with Lloyds approved Offtranp software calculations to be issued to clients for each item of equipment protected.
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JETFIRE DARMATT FLEXBLE PFP SYSTEM
- · High performance solution designed to meet the most demanding requirements for protection of critical flow and process equipment from Jet Fire conditions.
- · Offering up to an unprecedented 180 minutes protection
- · Darmatt™ can be fitted to valves, actuators, instrument panels, process vessels, cable trays, pipework and has been supplied extensively worldwide for both Onshore and Offshore Oil & Gas and Petrochemical installations.
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TEMPERATURE LIMITATION
The standard Darmatt™ PFP system has an outer skin that is suitable for a maximum operating temperature of 100°C. Should the equipment / pipework operate at higher temperatures (i.e.: above 100°C) we would be happy to propose the Darmatt™ system with a modified high temperature outer skin suitable for the application.
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PRODUCT CUSTOMISATION
The Darmatt™ PFP System can be customised to meet the customers’ specific environmental requirements, these include the following
- · Coloured Cloth to be in line with plant identification
- · DARVENT™ grilles to aid with ventilation to reduce the internal ambient temperature of protected item and prevent the buildup of gas.
- · Access Doors for maintenance or operating purposes.
- · Custom designed Rain Jackets for added weather protection.
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DARMATT PFP CONSTRUCTION DETAILS
Each Darmatt PFP system is specifically engineered to fit closely around the protected equipment providing a removable, compact and user friendly enclosure. The Darmatt PFP system is constructed from pre-shaped panels designed to fit together around the equipment to be protected. Each panel is constructed from layers of insulation fibre and reflective foil, compressed and studded with nylon pins throughout the panel’s area. The blanket is shrouded on the hot face by a steel mesh and the complete exterior covered by a non-fire rated weather resistant skin.
The nylon pins hold the components in the Darmatt™ PFP system together to ensure that the insulation materials remain securely in place and do not migrate to a different part of the panel (as experienced with lower quality insulation jacket systems). The nylon pins also compress the insulation to approximately 50% of its original thickness to provide a very flexible but compact system. All this helps to ensure that the PFP system is easy to remove and install again.
Inspection Hatches and Penetrations
Inspection hatches can be provided for each Darmatt™ installation to provide quick access to areas of the protected equipment that requires regular inspection or maintenance. Lloyds have approved these hatches for use along with the Darmatt™ PFP system. Penetrations for operating mechanisms, hydraulic tubing and position indicators etc. can be provided to facilitate problem-free operation and maintenance of equipment without the need to remove the jackets.