Clasification Society Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, January 2016 - Part 3 FUNCTIONAL UNIT TYPES AND SPECIAL FEATURES - Chapter 3 Production and Storage Units - Section 3 Hazardous areas and ventilation
Section 3 Hazardous areas and ventilation
3.1 General
3.1.1 For the application of hazardous area classification and related ventilation requirements, see Pt 7, Ch 2 Hazardous Areas and Ventilation.
3.1.2 Adequate ventilation is to be provided for all areas and enclosed compartments associated with the oil storage production and process plant. The capacities of the ventilation systems are to comply, where applicable, with the requirements of Pt 7, Ch 2, 6 Ventilation, or to an acceptable Code or Standard adapted to suit the marine environment and taking into account any additional requirements which may be necessary during start-up of the plant.
3.1.3 Ventilation in the vicinity of mud tanks is to be specially considered to ensure adequate dilution of any dangerous gases.
3.1.4 For units using oil-based mud, the tanks are to be provided with special ventilation arrangements, and for open systems, the maximum oil density in the air above the tanks is not to exceed 5 mg/m3. Ventilation of the enclosed spaces with open active mud tanks or pits is to be arranged for at least 30 air changes per hour for personnel comfort.
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