luni, 3 octombrie 2011

Regimes of pressure and ventilation systems

Chapter III

Pressure regime

If the accumulation of harmful substances are produced in the upper room while ventilated and will enter the occupied zone and / or explosion that may cause fire. In this case ventilation systems will create a more homogenous air quality so as to achieve normal concentrations of the hall where the entire working volume. All installations for fresh air introduction to a general dilution ventilation harmful substances released, and the exhaust air to compensate the local aspiration systems, will be made simultaneously with the effects of heating ventilation and air volume in the room if this is required by the nature of use halls and if the ventilation system is continuous.

Pressure regime in the halls or other type of room will be maintained in the following cases:

o If it is necessary to prevent air infiltration from the outside, in order to maintain normal status or ventilated air purity.
o If necessary the ventilation space to be protected against penetration of chemicals released into nearby rooms.

Regime depression in halls or other type of room will be maintained in the following cases:

o If need be nearby rooms are protected against substances released into the space (hall) which is ventilated
o If clearance ventilated space presents a particular danger degree
o In rooms equipped with emergency ventilation systems.

Natural ventilation held
In halls exothermic but accompanied with release of gases or vapors will install windows mobile mesh.
Mobile mesh windows will be installed at the top of the hall to ensure fresh air intake in the cold season.


Mechanical ventilation to exhaust foul air suction technology
Basic conditions: hazards do not develop exothermic from technological sources

Other conditions
Location suction holes is the hall floor and within easy reach of sources of gas or vapor releasing substances of technological
Location suction mouth is at the top of the hall when there is danger of accumulation of gases or vapors of technology with lower density than air and released in large amounts.
Suction holes are evenly placed in areas flawed.
Positioning the inlet openings to the mouth of introducing fresh air, is so that they can wash the air clean flawed.
The technological equipment or furniture will be placed so as to not obstruct the suction openings
Positioning suction holes will be so that if workers can not work between open source and suction clearance.

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