Placa rezistenta la foc - pentru ventilatie PROMAT PROMATECT - H

Limba: Engleza
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Tip documentatie: Catalog, brosura
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Pagina 1-Placa rezistenta la foc - pentru ventilatie
 PROMAT PROMATECT - H Catalog, brosura Engleza...
Ventilation & Smoke Extraction Ducts General Information For any size of duct, the tensile stress in the steel hangers must not exceed 10 N/mm2 for fire ratings up to two hours, or 6 N/mm2 for fire ratings up to four hours. The stress reduction ratio factors are based on BS 5950: Part 1: 1990, as reproduced below. The method to calculate whether the diameter of the threaded rod is within the permitted stress level is given below. Fire Resistance period up to hour(s) 1/2 1 1 /2 1 41/43 To calculate the stress of the horizontal supporting angle of channel, the following would apply. Board Thickness (mm) Duct Height (m) Duct Width (m) : : : : = = = = = = 12 1.0 1.0 1.22 [(Width x 2) + (Height x 2)] x Section length Area x Thickness x Density (900 kg/m3) (Section length x 4) + (Width x 4) + (Height x 4)] x 0.63 kg/m 61 (inclusive of angles) 597 WL = 91 8 M Z < 19.5 Approximate Temperature OC 840 950 1000 1050 1110 1150 Maximum permitted tensile stress (N/mm2) 18 10 10 10 6 6 Section L ... ascunde