Portable Gas Detectors on board Tankers :Why, What, Where and How ?
Portable Gas Detection
Source: www.rkiinstruments.com
Why do we measure Gases?
Gases can be hazardously posing a risk to life, to structures or to both!
Gases that are present on board tanker vessel may be :
Combustible / Flammable - Risk of Explosion
Methane (CH4); Hydrogen (H2S)
Toxic - Risk of Poisoning
Carbon monoxide ( CO); hydrogen sulphide ( H2S)
Asphyxiant - Risk of Asphyxiation
Nitrogen (N2)
Combustible Gases
A combustible gas is one that will burn when mixed with air (or oxygen) and ignited. Combustible gas-air mixtures can be burned over a wide range of concentrations. The actual minimum concentration varies from about 0.5% to about 15% by volume in the air for most common CHCs. This concentration is always referred to as 100% LEL or LFL for that gas. (delphian.com, 2018)
Gas Monitors are required in Cargo Operations to ensure that explosive conditions are not allowed to exist.
Toxic gases -> Toxic limits
Time-weighted average concentration (TWA)
Units = parts per million (ppm), or
mg/cubic metre (mg/m3)
Long-term exposure limit (LTEL) - (8 hours)
Short-term exposure limit (STEL) - (10 mins)
Gas Monitors are used to preventing overexposure.
Asphyxiant gases - limits
What do we measure?
20.9 % vol Oxygen – Needed for life
0% vol Oxygen – Needed to prevent fire and explosion
Flammable Gases – To monitor cargo operations and to prevent explosions
Toxic Gases H2S & CO – to avert danger to life.
Where do we measure?
Cargo Tanks
Confined Spaces
General Monitoring – e.g. on deck
How do we measure?
Portable Gas Detectors
Multi Gas Analysers – Cargo Operations
Multi Gas Detectors – Confined Space Entry
Single Gas Detectors – General Monitoring
Tubes – Various General Monitoring / cargo
Onboard responsibilities related to portable gas detector maintenance
General testing routine maintenance including charging, cleaning and self-checks.
Bump testing.
Calibration
Gas Testing
Bump Testing.
– Where gas is applied to see if the Gas Monitor is capable of reaching the alarm set points
Calibration
– Where gas is applied, and the instruments are adjusted to the concentration of the gas being used.
References:
Delphiancom. 2018. Delphiancom.
[Online]. [20 December 2018]. Available from: https://delphian.com/chc.htm
Rkiinstrumentscom. 2018. Gas
Detectors - Portable Gas Monitors - Gas Sensors by RKI. [Online]. [20 December
2018]. Available from: https://www.rkiinstruments.com/
Westerman M.2018 – “Portable gas detection”
- RN Presentation - Amsterdam 2018 IM&M
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