Confined Space Ventilation

Ventilation requirements for confined spaces in oil and gas facilities are typically calculated to achieve a minimum of 20 air changes per hour, or sufficient airflow to maintain atmospheric hydrocarbon concentrations below 10% of the lower explosive limit (LEL). The required airflow depends on the volume of the confined space, the potential source of contamination, and the regulatory requirements of the specific operator. Ramfan explosion proof blowers provide the high airflow volumes needed for effective confined space ventilation.

Yes. Ramfan explosion proof blowers supplied by AJV Tech carry ATEX and IECEx certification for Zone 1 and Zone 2 gas-classified areas, making them suitable for use in and around confined spaces within classified hazardous areas in refineries, petrochemical plants, and offshore platforms. The blower motor and all electrical components are explosion proof to IEC 60079 requirements.

Axial (propeller-type) blowers move large volumes of air at low static pressure and are suited to short, straight duct runs into confined spaces such as open-top vessels and shallow tanks. Centrifugal blowers generate higher static pressure and are more effective for longer duct runs or where resistance in the duct system is higher, such as deep vertical tanks or complex entry configurations. Ramfan offers both types in explosion proof configurations and AJV Tech can advise on the correct selection.

Purging duration before confined space entry depends on the initial atmospheric conditions, the volume of the space, and the airflow rate of the ventilation equipment. As a minimum, purging should continue until atmospheric testing confirms hydrocarbon concentrations are below 10% LEL and oxygen content is within the safe range (19.5-23.5%). Continuous ventilation throughout the work period is required where conditions may change. AJV Tech can advise on blower sizing to achieve rapid purging times.

Yes. AJV Tech supplies Ramfan explosion proof ventilation blowers with full IECEx and ATEX certification documentation for GCC projects, including certificates, declarations of conformity, and datasheets. Documentation meets the submittal requirements for ADNOC, Saudi Aramco, QatarEnergy, KNPC, and PDO projects. Stock is maintained in UAE for rapid deployment to confined space operations across the GCC.