Crowcon - Detecting Gas Saving Lives

Marine Industry


Marine industry many portable and fixed gas detectors. Indeed, the use of gas detectors is often compulsory: SOLAS regulations XI-1/7 requires that vessels have at least one portable gas monitor on board for oxygen and flammable gas detection. In addition to personal detectors, fixed detectors are widely used in various locations throughout the vessel.

Every ship must carry at least one marine certified (see Marine Standards section below) portable atmosphere-testing instrument. As a minimum it should measure concentrations of oxygen (O2), flammable gases or vapours, hydrogen sulphide (H2S) and carbon monoxide (CO) prior to entry into enclosed/confined spaces.

Marine applications often generate extreme temperatures, high humidity and dirty conditions. From O2 monitoring in cargo room exhausts, to monitoring flammable and toxic gases within various void spaces, to pump room or cabins, fixed systems with sampling are all commonly used in marine settings.


Shipyard owners and contractors
Ship owner and chandlers
Coast Guard/ Navy
Offshore rigs
Custom inspectors

Gas Hazards in Marine Industry

Marine vessels can present multiple gas hazards, which makes gas detection and monitoring crucial. The table below shows some examples of such vessels and applications.

Vessel Type


FPSO (Floating, Production, Storage and Offloading)
  • Flammable gas and hydrogen sulphide detection.
  • Flammable gas leak detection in pump rooms.
  • Inerted tanks or voids, therefore oxygen detectors are necessary in these confined space environments and where inerting gases are stored.
  • Hydrocarbon and oxygen monitoring during the purging of tanks (from %Volume to %LEL).
  • The fixed gas sampling system is dedicated to sequential gas monitoring in tanks, void spaces, pump room or houses adjacent to cargo storage tanks and handling systems. Up to 48 channels can be connected to the sampling system.
  • As above
  • CO and NOx accumulation from vehicle exhausts.
  • Hydrogen detection in battery rooms. CO2 leaks from air conditioning systems.
  • CO and NOx detection in engine rooms.
  • H2S and O2 depletion in bilges, arising from the on-board sewage treatment plant.
  • Vessels carrying food produce, such as grain, will sometimes install H2S detectors.
Cargo Tanks
  • Vapour emission control systems are used to analyse waste vapour gas for oxygen gas content. The system includes a pressure transmitter to monitor the pressure on the waste vapour line.

Products for Marine Industry

Portable Monitors

Portable 4-in-1 gas detector with new sensor technologies

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Gas Pro

A multi gas detector offering 5 gas support as well as a dedicated pre-entry check mode and optional pump feature

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Gas-Pro TK

Ideal for flammable gas detection at any concentration

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Fixed Monitors

Fixed multi gas detector

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Xgard Bright

Addressable fixed head detector with OLED display. Now available with MPS technology

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Our most flexible gas controller package

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Gasmonitor Plus

Flexible 19″ rack-based control system for gas detection monitors

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Addressable Controllers

Local non-intrusive operation & display with simultaneous live reading display and alarm functions via colour LCD display

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Marine Standards

Products installed on any marine vessel must comply with internationally recognized regulations. The international standards that apply to a vessel depend upon where it is registered.

Examples of countries and relevant standards are:

  • EU (European Union) countries: MED (Marine Equipment Directive 96/98/EC).
  • North America: US Coast Guard (USCG) regulations.
  • Other countries: SOLAS (Safety of Life At Sea) regulations provide the minimum requirements, however individual countries will require compliance with the standards of their chosen marine insurance body (e.g. BV, DNV etc).

It is essential that products sold for use on a vessel comply with the standards relevant to the country in which the ship is registered. For example, products fitted to a European-registered vessel undergoing a re-fit in Singapore must comply with the European MED directive.

Industry Insights

Detecting Hydrogen Fluoride in a Singapore Refinery

The Singapore refinery has been operating for over 50 years and prides itself as being the largest refinery in Southeast Asia. With two world class manufacturing plants in Singapore’s offshore area, this refinery is a major player in the energy and petrochemical sectors. The plant in Singapore produces fuel for retail, lubricants, aviation, marine and bitumen.

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Working together for safety at sea

Crowcon Detection Instruments is working together with Solent University’s Warsash School of Maritime Science and Engineering – all in the name of teaching engineering cadets, senior Merchant Navy officers, and Superyacht crews.

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