• safe disposal of hydrocarbon during drain down of process vessels and equipment.
No Drain System has been routed to a location that could affect the local environment. All toxic or hazardous discharges will be treated to comply with the National Regulations for waste management.
The process plated areas drain system will collect oily water in case of contaminants from all sources, due to discontinuous discharges from process equipment (e.g. for maintenance operations).
As a general rule:
• both closed and open drains fluids will be collected and disposed through dedicated systems in order to avoid hazardous conditions and environmental contamination;
• the systems are fully segregated to avoid cross contamination;
• the design of open drains shall prevent gas and fire to be propagated through the system;
• for LP Plants, enclosed drainage paths have been prohibited.
Closed Drain System
Closed Drain System receives directly from equipment containing process fluids. Closed Drain typical configuration considers the installation of 2 valves (1 ball valve and 1 globe valve) between the equipment and Close Drain Header (ball valves shall be defined locked closed). If required, the provision of bleed line between the two above mentioned valves could be provided. The bleed line routed to Open Drain is equipped with locked close ball valve.
Process drains from vessels, equipment, instrumentation and piping have been routed, via dedicated Closed Drain Headers, to a Closed Drain Vessel. Periodically, the contents of Closed Drain Vessel will be disposed by a discharged connection at Boat Landing location.
The Closed Drain Vessel has been sized to receive the maximum liquid load, provided that the process items are singularly drained.
Open Drain System
Open Drain System is fed from bounded process areas and atmospheric drainage points potentially affected by process fluids contamination. This system is also receiving fluids from open drain points displaced on the floor at all decks elevation to collect rain water.
3.5 ACCESS AND EVACUATION
Suitable access to all areas has been provided for maintenance and emergency.
Sufficient means of escape have been provided to enable efficient evacuation from all areas to designated muster point under hazardous conditions.
The primary method for evacuate, in case of emergency in NAQ-PIII Platform, is the normal way to getting on the Platform by vessel transportation. However, in many circumstances the primary method of evacuation could not be available and thus there is the need to provide a secondary method of evacuation to allow a fully controlled escape to the sea from an installation. This is done by means of life-rafts that are located at different decks of the Platforms, in strategic positions