Section 3 Hazardous areas and ventilation

Clasification Society 2024 - Version 9.40

Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, July 2022 - Part 3 Functional Unit Types and Special Features - Chapter 2 Drilling 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 ventilation requirements for drilling units, see Pt 7, Ch 2 Hazardous Areas and Ventilation.

3.1.2 Ventilation in the vicinity of the mud tanks is to be specially considered to ensure adequate dilution of any dangerous gases.

3.1.3 For units using oil-based mud, the tanks are to be provided with special ventilating 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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