Injury Illness Prevention Plan - Flipbook - Page 222
Health and Safety Program Manual
Teamwrkx
Construction, Inc.
Issue Date: 10/16/23
Revision Date: 10/16/23
Hydrogen Sulfide Awareness
Reference: B-3
H2S Detection and Alarm Systems
In most workplaces emergency worker alarms are installed to meet the regulatory standards. The alarms
provide warning for the necessary emergency action according to the site emergency action plan and provide
time for workers to safely escape from the workplace or the immediate area.
Systems are also used on drilling locations, offshore platforms, decaying plants and animals that produce H2S,
and some other plants. Signs are and should be posted stating the presence of poison gas and urging caution.
Warning Conditions
There are three conditions that you must be aware of when working around H2S. The following information
identifies the level of danger and alarms associated with each condition.
Condition Green
x
x
Possible Danger
No Alarms
Condition Yellow
x
x
x
Moderate Danger
H2S to 50 PPM
Intermittent Audible Alarm and Yellow Flashing Light
Condition Red
x
x
x
Extreme Danger
H2S at 50 PPM or Above
Continuous Audible Alarm and a Red Flashing Light
Hydrogen Sulfide Detection Devices
Fixed H2S detection devices (monitor and indicator) are designed to detect H2S concentrations in air and
established TWA (time weighted average) (10 PPM) and STEL (15 PPM).
The alarm should be capable of being perceived above the ambient noise or light levels in the affected area.
The alarm should be distinctive and recognizable as a sign to evacuate the area and to start emergency status
emergency procedures.
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