THERE ARE 3 CLASS OF DIVISION :-
- “A” CLASS DIVISION :- ARE THOSE DICVISION FORMED BY BULKHEADS AND DECKS WHICH COMPLY WITH THE FOLLOWING :
- THEY SHALL BE CONSTRUCTED OF STEEL OR OTHER EQUIVALENT MATERIAL.
- THEY SHALL BE SUITABLE STIFFENED.
- THEY SHALL BE SO CONSTRUCTED AS TO CAPABLE OF PREVENTING THE PASSAGE OF SMOKE AND FLAME TO THE END OF THE ONE HOUR STANDARD FIRE TEST.
- THEY SHALL BE INSULATED WITH APPROVED NON COMBUSTIBLE MATERIALS SUCH THAT THE AVERAGE TEMPERATURE OF THE UNEXPOSED SIDE WILL NOT RISE MORE THAN 140 DEGREE CELSIUS ABOVE THE ORIGINAL TEMPERATURE, NOR WILL THE TEMPERATURE AT ANY ONE POINT , INCLUDING ANY JOINT, RISE MORE THAN 180 DEGREE CELSIUS ABOVE THE ORIGINAL TEMPERATURE WITHIN THE TIME LISTED BELOW:
CLASS”A-60″ 60 MINUTES
CLASS “A-30” 30 MINUTES
CLASS “A-15” 15 MINUTES
CLASS “A-0” O MINUTES
THE ADMINISTRATION MAY REQUIRE A TEST OF A PROTOTYPE BULKHEAD OR DECK TO ENSURE THAT IT MEETS THE ABOVE REQUIREMENT FOR INTEGRITY AND TEMPERATURE RISE.
2. “B” CLASS DIVISION :- ARE THOSE DIVISION FORMED BY BULKHEADS, DECKS , CEILING OR LINING WHICH COMPLY WITH FOLLOWING :
- THEY SHALL BE SO CONSTRUCTED AS TO BE CAPABLE OF PREVENTING THE PASSAGE OF FLAME TO THE END OF THE FIRST HALF HOUR OF THE STANDARD FIRE TEST.
- THEY SHALL HAVE AN INSULATION VALUE SUCH THAT THE AVERAGE TEMPERATURE OF THE UNEXPOSED SIDE WILL NOT RISE MORE THAN 140 DEGREE CELSIUS ABOVE THE ORIGINAL TEMPERATURE, NOR WILL THE TEMPERATURE AT ANY ONE POINT, INCLUDING ANY JOINT, RISE MORE THAN 225 DEGREE CELSIUS ABOVE THE ORIGINAL TEMPERATURE WITHIN THE TEMPERATURE WITHIN THE TIME LISTED BELOW :
CLASS “B-15” 15 MINUTES
CLASS “B-0” 0 MINUTES
THEY SHALL BE CONSTRUCTED OF APPROVED NON COMBUSTIBLE MATERIALS AND ALL MATERIALS ENTERING INTO THE CONSTRUCTION AND ERECTION OF “B” CLASS DIVISIONS SHALL BE NON COMBUSTIBLE WITH THE EXCEPTION THAT COMBUSTIBLE VENEERS MAY BE PERMITTED PROVIDED THAT THEY MEET OTHER REQUIREMENTS.
THE ADMINISTRATION MAY REQUIRE A TEST OF A PROTOTYPE BULKHEAD OR DECK TO ENSURE THAT IT MEETS THE ABOVE REQUIREMENT FOR INTEGRITY AND TEMPERATURE RISE.
3. “C” CLASS DIVISION :- ARE THE DIVISIONS CONSTRUCTED OF APPROVED NON COMBUSTIBLE MATERIALS. THEY NEED MEET NEITHER REQUIREMENTS RELATIVE TO THE PASSAGE OF SMOKE AND FLAME OR LIMITATIONS RELATIVE TO THE TEMPERATURE RISE. COMBUSTIBLE VENEERS ARE PERMITTED PROVIDED THEY MEET THE REQUIREMENT.