Page 64 - Industrial Ventilation Design Guidebook

3.9 LOCAL PROTECTION 29

FIGURE 3.8 Calculation of local loads.

Explanations of Fig. 3.8
Step /: Emission Data/Calculation Model
Obtain data from Source Description.
Step 2: Changes to the Calculation Model

• Derive modifications on the case
* Make additional modifications, if returned from Local Protection

Step 3; Calculation of Loads to Environment
Calculate emissions from the source to the environment.
The tools for this task include design tools for calculation (models) and
measured data of emissions in different processes, which are defined in Source
Description.

3.9 LOCAL PROTECTION

Subprocesses are examined in order to provide proper working conditions lo-
cally or to reduce emissions to environment (see Fig. 3.9).
Before considering ventilation, technical measures applied to process
methods must be considered.
The last method in protection of the worker is respiratory protective
equipment.
In case use of a local protection system has an effect on exposure of the
process, load calculations shall be revised.