CPFG means "Combinated Pressurization, Fire and Gas" shutdown system. According to IEC60079-13(2019) and "Safety Rules for Offshore Fixed Platforms", the functional container will have a positive pressure air purge mode. When CPFG is turned on, CPFG will first control the blower fan to make the main cabin carry out air change at least 12 times per hour, and make the main cabin reach a positive pressure environment of >=50PA. When the main warehouse to achieve positive pressure 50PA environment, indoor safety zone, cabin DB(distribution board) will get electricity, so that air conditioning, sockets, lights and other electrical appliances get electricity, all sockets, air conditioning machine (non-explosion-proof), part of the lights.
What is airlock room?
The air lock area is located at the cabin door, separating the cabin door from the work area, and is the transition area into the work area.
How to ensure the pressure balance of the pressurized container?
The inner wall part forming the air lock area is provided with an inner door for entering and leaving the work area. The cabin be provided with a pressure monitoring device to ensure the pressure balance in the cabin.
What is airlock room for?
The installation of the two doors in the airlock area ensures that the protective pressure in the main room does not drop to zero when entering the airlock area after opening the airlock door.
Escape doors can be installed on the walls away from the airlock area in case of crisis, further improving the safety of the cabin. The positive pressure explosion-proof offshore function cabin makes maximum reasonable use of the limited space and provides a more comfortable and safe living and working environment for the staff on the complicated and changeable offshore platform.
"ONSHORE ISO SHIPPING CONTAINERS" VS "OFFSHORE DNV SHIPPING CONTAINERS"
DIFFERENT HAZARDOUS AREAS HAVE A CERTAIN IMPACT ON THE DESIGN OF CONTAINERS, BUT HOW TO IDENTIFY ZONE 0, ZONE 1, AND ZONE 2 HAZARDOUS AREAS?
- EXPOSURE TO HARSH ENVIRONMENTS
- Offshore containers are often left exposed to open sea on the decks of supply vessels, and also loaded to platforms in harsh weather conditions, this also means that the minimum design temperature is normally specified as -20° C and the primary structure requires material of sufficient toughness for -20° C.
- LOADING AND UNLOADING FORCES
- Because many offshore containers cannot be used with typical lifting equipment such as spreader beams, the methods of loading and unloading put different types of pressure on the structures of offshore containers. Offshore containers are supplied with a permanently installed sling set. Most do not have corner castings, and if they do, they are not allowed to be lifted from them.
- NON-STANDARD DESIGNS
- Most offshore containers are built to fit a specific piece of equipment, and therefore, do not fit into the ISO container category.
DIFFERENT HAZARDOUS AREAS HAVE A CERTAIN IMPACT ON THE DESIGN OF CONTAINERS, BUT HOW TO IDENTIFY ZONE 0, ZONE 1, AND ZONE 2 HAZARDOUS AREAS?
- Zone 0: the area where explosive gases persist for a long time or will occur frequently.
- Zone 1: the area where an explosive atmosphere may occasionally occur during normal operation. It may exist as a result of repair, maintenance operations, or leaks.
- Zone 2: the place where an explosive atmosphere is unlikely to occur during normal operations, but if it does, it will only last for a short time. These areas become dangerous only in the event of an accident or some unusual operating conditions.
