Hazardous Gas Monitoring Presented by: Kevin Geidel – CFPS, CET

Objectives • What is HGMS? • Design Standards • System Components • Engineering Evaluation • Continual Operation

HGMS • Continuous program of observation,

measurement and judgment. • Area Monitoring – measures exposure

of the ambient air concentration of a particular substance in a given area at a given time

Purpose • Fire Safety

– Flammable Concentration – Fuel Load

• Life Safety – Contaminated Breathing Air

Toxicity vs. Flammability • Capacity of a material to produce injury or

harm when the chemical has reached sufficient concentration at a certain site in the body.

• Capacity of a material to burn, regardless of source or chemical composition, when dispersed as a gas in ambient air.

Design Standards • National Fire Protection Association • Instrument Society of America • American National Standards Institute • FCNYS - Chapter 35

Instrument Society of America • ANSI/ISA S12.13 – Performance Requirement,

Combustible Gas Detectors • ISA RP12.13, PR II-87 – Recommended Practice:

Installation, Operation, and Maintenance of Combustible Gas Detection Instruments

• ANSI/ISA S12.15, PT I-90 – Performance Requirements for Hydrogen Sulfide Detection Instruments (10-100 ppm)

• ISA RP12.15, PT II-90 – Recommended Practice: Installation, Operation and Maintenance of Hydrogen Sulfide Detection Instruments

National Fire Protection Association • NFPA 30 – Flammable and Combustible Liquids

Code • NFPA 70 – National Electric Code • NFPA 72 – National Fire Alarm and Signaling Code • NFPA 86 – Standard for Ovens and Furnaces • NFPA 720 – Standard for the Installation of Carbon

Monoxide (CO) Warning Equipment in Dwelling Units

NFPA 70 – NEC • National Electric Code – Article 500

– Class 1 Division 1 – Class 1 Division 2

Types of Systems • Portable • Fixed • Personal • Area

Portable Detection

Fixed Detection

Personal Detection

Area Detection

System Components • Sensors • Transmitters • Communication • Display Units • Notification Appliances • Exhaust Monitoring

Sensors • Semiconductor (MOS) • Electrochemical • Flame Cell • Flame Ionization • Nondipersive Infared (NDIR) • Oxygen Detectors

Other Components • Transmitters • Communication Protocol • Display Units • Notification Appliances • Exhaust Monitoring

Design Requirements • ANSI/ISA S12.13 vs NFPA 72

– Supervision – Automatic Response – Sensor Placement – Engineering Evaluation

Engineering Evaluation • Ambient Conditions Analysis • Compartment Analysis • Process Analysis • Chemical Analysis • Life Safety Analysis

Continual Operation • Preventive Maintenance • Process Improvement • System Calibration • Component Testing

Ammonia Room

Solvent Room

BUTLITH Room

Learning Assessment • What is HGMS? • Who drives the design standards? • Define a Class 1 hazard. • What is the purpose of an ambient air

analysis?

Hazardous Gas Monitoring Presented by: Kevin Geidel – CFPS, CET

Fire Protection Engineer Life Safety Services Department

C&S Engineers, Inc. kgeidel@cscos.com