MEI_Pre Qualification Submittal 2017
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<strong>MEI</strong> P.U. Insulated Panel 32/250<br />
(IT)<br />
<strong>MEI</strong> 32/250 Insulated Panel<br />
Bottom Liner<br />
<strong>MEI</strong> 32/250<br />
P.U. INSULATED<br />
PANEL<br />
Top<br />
Thickness<br />
(mm)<br />
INSULATION THICKNESS ( IT mm)<br />
35 50 80 100<br />
Allowable Span (mm)<br />
Steel Alum. Steel Alum. Steel Alum. Steel Alum.<br />
0.5 2300 2025 2725 2435 3750 3100 4050 3550<br />
0.7 2725 2300 3375 2935 4150 3600 4850 4125<br />
0.9 3025 2675 3740 3125 4800 4000 5175 4425<br />
Combined<br />
Conductivity<br />
W/m²°C<br />
P.U. 0.55 0.385 0.245 0.195<br />
SPAN DESIGN CRITERIA<br />
• Steel yield strength 345 N/mm², Elastic modulus<br />
205 KN/mm².<br />
• Aluminium yield 170 N/mm², modulus 70 KN/mm²<br />
• Maximum combination of working loads 1.5 KN/<br />
m²<br />
• Span selected as the minimum value from pressure<br />
and suction case, assuming no bond slip.<br />
• Bottom skin (Liner) thickness = 0.5mm.<br />
CONDUCTIVITY CALCULATED WITH<br />
FOLLOWING CONDITIONS<br />
• Thermal conductivity of polyurethane<br />
(P.U.) is 0.02 W/m. °C<br />
• Metal sheets ignored.<br />
• Summer condition at roof<br />
(Heat transfer from out to inside).<br />
• Assumed external wind speed 4mph<br />
(6.4 km/h)<br />
• Allowable elastic deflection is L/150
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