Operation Sequence of Staircase Pressurization System

MVAC system of DHQC project at Akuregoda

Block 07

Operation procedure of staircase pressurization system General

Main components of staircase pressurization system and teir locations are so!n in "a#le $  #elo!% "is system is acti&ated #y a signal recei&ed from te firefigter smoke control panel '!ic !ill #e installed #y fire detection system contractor(% )en te system is running*  pressure inside te stair!ell need to #e controlled so tat te pressure does not e+ceed pre, defined &alue% "o do tat* an air release damper installed on te duct is opened #y a signal taken from te pressure sensor located inside te stair!ell% "a#le $- Main components and locations

Main components

Location

Duct

All le&els and roof top le&el

Air Diffusers

All le&els

.taircase pressurization fans

/oof top

ressure sensor

.tair!ell

Air relief damper

1n te duct installed on roof top

o!er panel and Manual Control oint

/oof top

Considerations for air relief damper operation •

)en )en te smoke smoke managem management ent system system operate operate** te pressu pressure re diffe differenc rencee #et!ee #et!een n te stair!ell and te accommodation area increases% "erefore te force re2uired to open te

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door also increases% As per te B. 3344,5 6 $4* tat force sould #e limited to $00 8% ressure difference need to #e maintained #et!een stair!ell and lo##y is 30 a )en smoke management system for 9t floor operates* ma+imum pressure difference  #et!een stair!ell and lo##y de&elops

Procedure to set the pressure for air relief damper

A control system incorporated !it a pressure sensor is used to operate te air relief damper% According to te pressure sensed #y te pressure sensor* te air relief damper is controlled #y te control system% "is !ill #e operated in #et!een t!o pre,defined pressures '#et!een lo!er limit '$( and upper limit ':((

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MVAC system of DHQC project at Akuregoda

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Block 07

"e smoke management system for 9t floor is acti&ated "e accommodation , lo##y door is kept opened "e force re2uired to open te stair 6 lo##y door is measured )en tat force reaces $00 8* te pressure reading 'upper limit ,  P 2( of stair!ell sensor  is noted "at pressure is taken as te set pressure to open te air relief damper  8ote- 8o! te pressure inside te stair!ell decreases* due to lack of air inflo!% )en pressure reading inside te stair!ell drops #y $0 a from  P 2* te air relief damper  again operated to its closed position% "is pressure is te lo!er limit '$(%

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