Post on 16-Oct-2021
HYDROGEN SULFIDE
� Operates two oil spill response bases in the country.
� Marine EIA of Kudankulam nuclear power plant
� Wave energy harnessing design patent filed.
� Spill response equipment design patent filed
Background
� Qualified H2S trainer by ASSE (US).
� Captain of oil tankers - Extensively handled sweet
and sour crudes. Carried out tank washing, gas
freeing and man entry.
� Done finance management in Singapore
� Done EGMP at IIM Bangalore
� Represents India on council of International Spill
Control Organization, a consultant to IMO.
� Trained and experienced incident investigator,
internal auditor of safety management systems.
D.C.Sekhar (MD)AlphaMERS Pvt Ltd
• Invisible
• Flammable
• High toxicity
• Numbs the sense of smell
• Inhibits oxygen transport in blood
• Heavier than air
• Corrosive
• Causes pyrophores
• Sulfide stress cracking
General properties of H2S
S
HH
PHYSICAL STATE
260 deg C Self Ignition temperature
-60 deg C Boiling Point
-85 deg C Freezing Point
Physical state of H2S
UFL 44%
Hydrocarbon
Oxygen
LFL 4%
Flammability diagram
Outputs of burning or flaring
CO
H2S
CO2
SO2
Flaring
H2S + H20 = WEAK ACID
H2S combines with water with the mucous in
our body and forms a weak acid.
This happens in the eyes, mouth, throat and lungs.
This causes eyes to burn, cough and pulmonary
odema.
Hyper susceptible population –
Previous lung problems
Has consumed alcohol within last 24 hours
Effect on mucous membrane
Flow of oxygen
Pyrophores
And
Sulfide stress cracking
Structural failures and risks
Escape !!!
ANY READING ON H2S MONITOR ?
H2S Source
Escaping the plume
Action level ?
Escape
Cartridge type masks or escape units for
emergency escape.
Rescue and planned work
SCBA or combination +ive pressure supplied air for
planned work in H2S environment.
Respiratory protection
Currently practised levels are PEL 10 ppm and STEL 15 ppm.
Ceiling level 20 ppm. For a ten hour shift, the TLV is lesser !!
ACGIH (US) recommended PEL 1 ppm and STEL 5 ppm in 2010.
Is this practicable ?
Sludge control work in tanks – is this PEL practical ?
Accuracy and resolution of the measuring equipment
New PEL by ACGIH
� One of the popularly used gas instruments brand :
� SENSOR: H2S (Hydrogen Sulfide)
� RANGE: 0-200 ppm
� RESOLUTION: 1 ppm
� REPRODUCIBILITY: +2 ppm or 10% of reading,
� whichever is greater (normal temperature range*)
Resolution and accuracy
PEL and STEL
Calibration regime of measuring equipment
Flaring best practices
Permissible escape breathing devices
Benchmarking our standards
Long term human effect due to exposure
Hyper susceptible population
H2S embritlement of steel
Possible study areas
THANK YOU !!!
www.alphamers.com
91-9980222870
sekhar@alphamers.com