Confined Spaces

Confined spaces are typically found in tanks, pipelines, container vessels, sewers, pipelines, shipping containers, manholes or enclosed areas. By definition, a confined space has temporary or restricted access, they’re below two metres in length, width and height, have a volume of less than 100 m3 with limited means of ventilation.

Pre-Entry Checks

Pumped multi-gas detectors or detector tubes with attached hoses or probes are recommended to ensure that it’s safe to enter a confined space.

Entering Confined Spaces

A davit or tripod is used to safely access a confined space with no fixed anchor point such as a ladder. A fall arrest system securely lowers or raises workers and equipment.

Working in a Confined Space

Poisonous substances such as rotting materials or stagnant water in confined spaces cause poor air quality resulting in insufficient breathable air.

Gas detectors should be worn for continuous monitoring of personal space to give warning to the threat of any hazardous and flammable gases.

If breathing air is poor, breathing apparatus must be considered to provide a continuous flow of safe, breathable air.


Accessing a confined space may be at height. A fall arrest rescue block or a Self-Retracting Lifeline (SRL) is mounted to a rescue tripod or an overhead anchor point will limit free fall distance or lock to control speed. The device can also be used to lift or to lower the casualty to safety.


For quick and safe exit to escape or rescue, our confined space kit includes all the components needed to safely enter and exit a confined space

Case Study - How EfW Operators are Benefiting From a Biogenic CO2 Sampler

To obtain ROC’s, the operator must prove biogenic content is at 50% or greater. With our Ofgem approved sampler, operators can be confident of submitting accurate results to claim ROCs.

Case Study - CO2 Detection System Commissioning at Brewery

If leaks go undetected, CO2 is a major threat to health within the brewing industry. a1-cbiss comissioned a fixed gas detection system for CO2 and O2 ready to provide visual warnings once alarm levels are reached.

Talk with the Experts

Contact us - Our application specialists will identify the best gas monitoring equipment for your needs based on the information that you can provide. If you're unsure about what's important, consider booking a site survey.

Book a site survey - Our specialists consider your process, your site conditions and work with you to understand your needs. It is the most effective means of ensuring your system is completely fit for purpose.