DARSCREEN™ RADIATION SHIELD PERFORMANCE
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Darchem can predict the reduction in radiation heat flux for various different configurations of Darscreen™ Woven Mesh heat shields.
For a known incident heat flux on the hot face of the heat shield the attenuated heat flux can be predicted at set distances from the cold face of the heat shield
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Stated input heat flux to an acceptable level for general areas where personnel may be exposed.
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HEAT SHIELD DESIGN
Each heat shield manufactured is individually designed based on the incidental heat flux levels and frequency, heat reduction target and any additional customer specific requirements.
- · Darscreen™ Woven Mesh System
- - Designed for lower heat flux levels
- - Although the system can be employed as a horizontal heat shield fitted directly below the flare tip, it is more commonly used as a vertical heat shield solution protecting critical plant, steelwork and personnel in the event of a fire, offering up to a 75% reduction in irradiance
- - The system is manufactured as a modular system with individual panels made up of a 1 or 2 layers of 4 x 4 or 8 x 8 woven mesh welded to a channel frame. Where a load bearing requirement is present, i.e. in a horizontal system, grating can be welded to the top edge of the frame. The individual panels are kept at a manageable size to allow ease of installation.
- - Excellent see-through properties and is naturally venting
- · The Darscreen™ windbreak
- - Protect walkways, stairwells and other areas from the battering effect of high winds.
- - The advantage over a perforated plate system by having better visibility for personnel and less risk of stagnant regions
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DESIGN OF THERMAL RADIANT SHIELDING
- · Continuous Shielding (steady state); as in the case of a flare tip on an Offshore Installation
- · Fire Hazard Shielding (limited duration); where a piece of equipment is adjacent to a potential fire hazard for the time it would take to extinguish the potential fire.
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THERMAL RADIANT SHIELDING
- · Darscreen™ Woven Mesh System is designed for use with lower level heat fluxes, or for wind shielding, and is commonly employed as a vertical heat shield protecting critical equipment, structures, and personnel.
- · Darflare™ Chevron System is designed for use with higher heat flux levels such as those experienced during flaring operations
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DARFLARE™ CHEVRON SYSTEM
- · The Darchem / BP Collaboration the Chevron system was developed and installed on the Magnus Platform. This not only resolved the problem but also offered a heat flux reduction of more than 90%.
- · The Chevron system is designed, through convective airflow through the panels, to reduce the radiant heat on the cold face of the shield to below 100°C during flaring ensuring that the structural steelwork is not compromised.
- · The panels are assembled with a proprietary fixing system, designed to allow the system to expand during flaring intervals while holding each panel in place to the supporting structure.
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PRINCIPLE FEATURE OF THE RADIANT HEAT SHIELD SYSTEM
- · Lightweight
- · Cost Effective
- · Maintenance Free
- · Heat Dissipation
- · See-through & Venting