Hydrogen risk assessment in s o paulo state brazil
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4 th International Conference on Hydrogen Safety ICHS 2011 12 - 14 September 2011 San Francisco, CA, USA. Hydrogen risk assessment in São Paulo State – Brazil Newton Pimenta Sandro Tomaz Giuseppe Michelino. 198_NevesN. São Paulo State (SP). Municipalities: 645 Population:

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Hydrogen risk assessment in São Paulo State – Brazil

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Hydrogen risk assessment in s o paulo state brazil

4th International Conference on Hydrogen SafetyICHS 2011

12 - 14 September 2011

San Francisco, CA, USA

Hydrogen risk assessment in São Paulo State – Brazil

Newton PimentaSandro TomazGiuseppe Michelino

198_NevesN


Hydrogen risk assessment in s o paulo state brazil

São Paulo State (SP)

  • Municipalities: 645

  • Population:

    • 41 million inhabitants

    • 95% urban

  • Gross Domestic Product: 34% of the country

  • 21 million vehicles

  • 108,000 industries

FONTES: IBGE, DETRAN-SP


Sp environmental protection agency cetesb

SP Environmental Protection Agency (CETESB)


Cetesb main objectives

CETESB Main Objectives

  • Evaluation of environmental quality Air - Water - Soil

  • Inspection of environmental pollution sources

  • Technology transfer in the environmental field

  • Prevention - environmental licensing

  • Main focus is outside the walls.


Hydrogen risk assessment in s o paulo state brazil

VILA SOCÓ - CUBATÃO CITY

04/Feb/1984

GASOLINE PIPELINE RUPTURE

FOLLOWED BY FIRE

Source: Banco de Imagens da CETESB/1984


Hydrogen risk assessment in s o paulo state brazil

500 victims

93 deaths

Source: Petrobrás


Licensing prevention

Licensing - Prevention

Environmental

Licensing

Previous and

Installation License

Operational License

Risk Analysis

(RA)


Hydrogen risk assessment in s o paulo state brazil

Hazardous substanceand quantity (RD)

Off-site Vulnerability

QRA?

NO

YES

Off-site scenarios selection

ConsequenceAnalysis

FrequencyAnalysis

CETESB’s Risk Analysis Flowchart

Risk estimation (Societal & Individual)

Needriskreduction?

YES

Risk reduction measures

NO

Risk Management Program


Risk management program rmp

Risk Management Program (RMP)

  • Process Safety Information

  • Management of Change

  • Operating Procedures

  • Training

  • Assuring the Quality and Mechanical Integrity of Critical Equipment

  • Emergency Response and Control

  • Investigation of Incidents

  • Audit of Risk Management Systems


Comparison qra x rmp

Comparison: QRA x RMP

Quantitative Risk Analysis:

Expensive

Subject to greater uncertainties

Time-consuming

Risk Management Program

Not expensive

Simple

Less time used in analysis

Reference Distance supports the decision-making


Reference distance rd

Reference Distance (RD)

  • Reference Distance (RD)

    • Maximum distance reached by 0.1 bar overpressure from vapour cloud explosion (1% death).

  • Instantaneous release of 20% of the inventory of a vessel/tank

    • Cloud dispersion to Lower Flammability Limit (LFL)

    • Vapour Cloud Explosion (VCE)

    • Software PHAST 6.54 determines the “worst case” consequences for an explosion.

  • Chart: RD x Mass


Hydrogen rd chart and vce

Hydrogen RD Chart and VCE

Vapour Cloud Explosion

Hydrogen RD Chart

Distance to 0.1 bar

Cloudcenter

Leaksource

LFL

Reference Distance (m)

Simulation : weather conditions


Rd application

RD Application

Population inside

RD circle?

NO

Risk Management Program (RMP)

YES

QRA


Example of rd application

Example of RD Application

  • Four interconnected hydrogen vessels, each one with 250 kg (total 1,000 kg)

  • Chart indicates a RD of 81 m

  • Is there population inside the RD circle? From the figure the answer is YES

  • Conclusion: the facility must submit a full QRA to CETESB


Example of rd application1

Example of RD Application


Discussion

Discussion

  • The assumptions may be conservative in some cases. For example: it does not consider any protective system

  • Initial screening

  • Covers storage cases

  • Not for continuous process


Conclusion

Conclusion

  • Not the worst case, but conservative

  • Simple, easy to aplly and cheaper

  • Money / time saving


Hydrogen risk assessment in s o paulo state brazil

Thank you! Obrigado!

São Paulo Environmental Protection Agency

Brazilian Reference Center

for Hydrogen Energy

Hydrogen Laboratory

at Unicamp

Contacts:

Sandro [email protected]

Giuseppe [email protected]

Newton [email protected]


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