Saturday, 16 June 2012

Vth-yr-working drawing-building-parts-as-per-fire-safety-nbc.

dear students,

it was a nice group meeting on friday afternoon. i thank you all for being  present after  college hours. your dedication to the subject is appreciated. as i mentioned to you during interaction, whether following  CIBSE public health guidelines and occupant load as per international standards, in our building designs; is required to be shared with other groups. for that i interacted with their group teachers. they are of opinion that they know there are defects in your designs. but they want to focus more on finishing WD asap and allow you to devote balance time to THESIS. if we want to buy this argument, i have no issues, to be at par with other groups. but i would still insist that you solve toilets for at least 2 spaces as per above. so you should have minimum 2 men's toilets and 2 women's toilets solved by above method and show it to me on tuesday morning without fail. even those students who were not present on friday, should understand the process from others and bring it to class. regarding redrafting on your WD's as per above changes, we will decide on consensus basis on tuesday. if you do as i say on tuesday, it will give you good hands-on practice as regards how to use these guidelines properly. this in turn will help you to use it correctly and completely on your THESIS design, which i would insist you should do to make it look more authentic. 

i promised you that i will upload more data related to how to apply fire safety norms for all building parts. i am giving you tips for designing as per national building code (NBC). please note NFPA (national fire protection association) norms may vary slightly. but do not worry for NFPA. 

1. staircase: the staircase shall be ventilated (min. area 0.5 to the atmosphere out side at each landing and a vent at the top; or alternatively a positive pressure 50 Pa (pascal=1 newton per sq. mts.) will be maintained mechanically to operate automatically with fire alarm.

the minimum width of staircase shall be as follows:
a). residential buildings (dwellings)              1.0 m
b). residential hotel buildings                         1.5 m
c). assembly buildings like auditoria,             2.0 m
      cinemas, theaters.                                      
d). educational buildings                                 1.5 m
e). institutional buildings                                 2.0 m
f). all other buildings                                        1.5 m

2. Lifts: a). the number of lifts in one row for a lift bank shall not exceed 4 and the total number of lifts in the bank (of two rows) shall not exceed 8. a wall of 2 hr fire rating shall separate individual shafts in a bank. 
b). collapsible gates not permitted. solid doors of 1 hr fire rating required.
c). Lifts in basement will be pressurized 30 Pa in lobby. 
d). one fire lift per 1200 sq. mt. of floor area with open-able ceiling hatch, with speed to reach top floor from ground floor within 1 minute is to be provided. fire lift will be controlled by simple toggle or two button switch (means when switch is on, landing call-points will become inoperative and lift will be on car control only on a priority control device). 
e). the lift shall have a floor area of not less than 1.4 sq.mts. they shall have loading capacity of not less than 545 kg (8 persons lift) with automatic closing doors of minimum 0.8m width. (on ground floor doors of minimum 1.0 m width required as per NFPA). 
f). the electric supply shall be on a separate service from electric supply mains in a building and the cables run in a route safe from fire, that is, within the lift shaft. 

3. Basement: a). Each basement separately ventilated by vents in cross-sectional area 2.5% of floor area. 
b). in multi-storey basements, intake ducts may serve all basement levels, but each separate levels, but each basement levels and basement compartment shall have the same separate smoke outlet duct or ducts. 

4. a stand-by electric generator shall be installed to supply power to staircase and corridor lighting circuits, fire lifts, the stand-by fire pump, pressurization fans and blowers, smoke extraction and damper systems in case of failure of normal electric supply. where parallel HV/LV supply from a separate sub-station is provided with appropriate transformer for emergency, the provision of generator may be waived in consultation with the authority. 

more things like corridors, FHC (fire hose cabinet), and travel distance  some other time....

prof. atule kedia

No comments:

Post a Comment