Consulting | Evaluation | Measures
What limits do I have to comply with? Ask the experts!
To reduce emissions, a variety of measures are suitable to comply with the required limit values for each hazardous substance. In any case, the measures depend on the remaining concentration of hazardous substances in the environment, which can cause potential hazards. These concentrations are calculated with the help of various models. Important for the compliance with the limit values is the so-called ground concentration, i.e. the concentration of hazardous substance which is located near the ground and which could cause harm to persons. The aim of the safe discharge of hazardous substances into the environment is therefore to ensure that the limit concentration near the ground is strictly maintained.
Due to the many years of experience in the field of safe discharge, CSE-Engineering is able to perform a quick estimation to evaluate the ground concentration for your hazard scenario and subsequently provide you with competent advice on measures to reduce emissions.
Natalie Schmidt, M.Sc.
Process Safety Engineer
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- Definition of explosion protection zones for flammable substances
- Verification of compliance with toxicological limit values (e.g. ERPG value, AEGL value, PAC value)
- Evaluation of the gas propagation depending on the wind direction
- Evaluation of hazards in case of leakage
- Evaluation of the dispersion during evaporation from pools
- Evaluation of the propagation of gases when discharging from safety devices
- Assessment of sound emissions and noise
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Safe and efficient to the goal
The safe discharge is evaluated in various areas. Very high concentrations of the hazardous substance are often present in the close range, i.e. in the immediate neighbourhood to the release location. In this area, high ignition probabilities often occur with flammable gases, which have to be considered in the explosion protection document. The size of the close range can be determined with a simple free jet calculation. In the long-distance range, i.e. away from the point of release, the propagation of the hazardous substance is diffusion-controlled and ignition of the gas is impossible in this range. However, the concentration of toxic substances in the long-distance range can still be so high that the ground concentrations (ERPG values) cannot be maintained to protect persons. The level of the ground concentration is calculated using so-called Gaussian models, for example according to VDI 3783 Part 1 (light and density-neutral gases) and Part 2 (heavy gases). The CSE experts will be pleased to advise you if you have to discharge hazardous substances into the environment and check compliance with the limit values for your type of release.
State of technology – Standards
In the field of emission reduction, the following standards have to be considered unless more detailed methods for specific process plants apply and therefore define the state of technology. In every single case the application limits of the standards and the assumptions behind the methods have to be examined:
- VDI 3783
- DVGW G422
Publications | Manuals
- 1987 Dissertation Schatzmann
Training & Coaching
With the Applied Safety Premium Seminars of the CSE Academy, you will also provide your employees with an in-depth understanding of the methodology and its practical implementation. Also as in-house training.
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