Assess the ventilation of an enclosure and the effective release rate
of an installation for indoor hazardous-area zoning. Define the installation's
continuous, primary and secondary sources, then evaluate natural or artificial
ventilation. A simple Zone 1 check is available when flow-rate data are not to hand.
Building Ventilation Menu
Applies to every calculation on this page.
kg/s
Simple Zone 1 Assessment
Assessment
External Zone Distance (m)
Zone Distance
Adverse conditions
—
Normal conditions
—
Naturally Vented Building
Assessment
Zone Distances (m)
Building Zone
Adverse
—
Normal
—
External Zone
Adverse
—
Normal
—
Artificially Vented Building
Assessment
Zone Distances (m)
Building Zone
Adverse
—
Normal
—
External Zone
Adverse
—
Normal
—
Data for Simple Zone 1 Calculation
This quick calculation can be performed if flow rate data for an installation are not
available. The calculation will only assess whether Zone 1 is achieved inside the enclosure.
If a full calculation is required, exit this dialog, uncheck the "Perform simple Zone 1
Calculation" box and click on the "Calculate Effective Release Rate for an Installation" button.
To continue with the Zone 1 calculation enter the data below:
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Continuous or Primary sources are present, so the
simple Zone 1 calculation cannot be used. The Perform simple Zone 1 calculation
option has been switched off — close this dialog and click Calculate Effective
Release Rate for an Installation to run the full calculation.
The Zone 1 calculation can only be performed if there are only Secondary Sources in the
Enclosure. Please proceed with a full calculation following the instructions above.
Installation - General Data
List of Sources
Name
Flow Rate
Actions
No sources added.
Type
Adverse
Normal
Flexible pipes and bellows in adverse conditions
Regulator diaphragm* fail, pin hole
Rising stem valve stem
Rotating stem valve stem
Screwed union/single ferrule compression joints
Screwed fitting, sealed
Flange, flexible pipes and bellows in normal conditions
Twin ferrule compression joints
*Note - If a diaphragm breather chamber is vented to outside the enclosure, it is
considered as a flange.
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Define New Naturally Vented Building
Used only when ventilation is more than adequate.
Define New Artificially Vented Building
Used only when ventilation is more than adequate.
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