Such 40ft pressurised container will be used as MCC shelter, which is located in hazardous zone 2 area. The pressurised container are designed, manufactured and tested in accordance with requirements of the following latest editions standards and regulations.
Temporary Refuge Shelter (TR), safe haven cabin, toxic gas refuge shelter (TGR)
Temporary refuge shelter is a containerised module designed for persons for hours time duration in case of emergency such as toxic gas leakage, explosion, etc. which includes complete of air-lock, HVAC system, breathing air system (emergency pressurisation system), stand-alone electric system (UPS + batteries), F&G systems, facilities (medical kit, water and toilet) and accessories. Containerised or blast resistant structures are designed to protect persons in order to give possibilities of installation in safe area or explosion risk zone.
HVAC running in Emergency mode for TR
This kind of SURVIVAL MODULE is designed as "Modularised container/shelter" ready for the use as a “Stand alone package” meeting the following requirements:
* High resistance to the adverse climatic and atmospheric conditions (corrosive marine conditions, high temperature and solar radiation in desert environments, industrial /oil gas aggressive chemical atmospheres)
* Easy transport via land (road or railway) or sea.
* Easy assembly of the entire Survival Module by simple bolting or (if required) welding.
* Easy management and maintenance of the HVAC, Breathing Air and Electric systems.
HVAC stopped in Emergency situation
The fresh air intake is 100% redundant and it is sized in order to prevent the ingress of gas before the F/G system detection close the dampers. Under certain outdoor conditions, the CHEMICAL FILTER assure acceptable indoor conditions but when the maximum ppm vales are measured inside the Safe Area, the system switch to a full recirculation mode. In this particular emergency condition the HVAC system recirculate only the indoor air and provide for a first de-contamination by POLISHING FILTER. After this stage will be the CO2 SCRUBBER to be activated in order to keep breathing air atmosphere inside the room. In full recirculation mode, the pressurisation and the additional breathing air for all the people inside the refuge will be assured by dedicated HP Breathing air system composed by BA Cylinders Storage Racks (typically at 300 bar of storage pressure), reduction groups and nozzles for air diffusion.
Overpressure systems for Electrical Substation or TR- Protection from weather/dust/toxic gas. The engineering of HVAC system or Emergency Pressurisation System start from the idea of personnel and equipment protection from critical outdoor conditions like extreme weather, dust or sand storm, H2S, HCL or other toxic gasses contamination. The first solution is to keep the projected indoor condition adopting a correct overpressure system with the necessary outdoor protection.
IECEx and ATEX rating
One of the most important focus point of HVAC engineering and construction in the Oil gas sector or in other difficult environmental conditions is to keep attention to the atmosphere composition. Due to this condition it is possible that all the components of HVAC equipment shall be IECEx & ATEX certified. We have planned, designed and realised solutions to prevent H2S and other hydrocarbon gases from entering the buildings in Oil & Gas complexes. The HVAC fresh air intake is projected in order to give the necessary closure time to Fire & Gas Dampers before the entry of toxic gases in the Electrical Substation. All the outdoor equipment are ATEX Zone 1 IIB T3 rated.
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Battery Powered Temporary Refuge shelter (TR) or Toxic Gas Refuge (TGR): Meeting Requirements, Optimising Safety
BATTERY POWERED TEMPORARY REFUGE SHELTER (TR) OR TOXIC GAS REFUGE (TGR): MEETING REQUIREMENTS, OPTIMISING SAFETY
HVAC forms an essential part of the essential safety services onboard a rig and a part of the area classification requirements associated with electrical equipment. The HVAC systems should prevent any potentially explosive or toxic gas-air mixtures entering non-hazardous areas such as living quarters.
The Battery Powered Temporary Refuge Shelter fully complies with the requirements of HSE (Health and Safety Executive) and ISO. It was designed by TLS Engineering, a leading specialist in maritime air conditioning, central heating and cooling, and mechanical ventilation.
What are the requirements?
HVAC systems should provide for a pressure differential in non-hazardous areas with all access doors closed of which is at least 50 Pa above that of the adjacent hazardous areas.
TR areas should have a pressure of between 50 and 75 Pa. in order to measure pressure decay over time. This is used to calculate an air leakage rate and a performance measure of the structure’s integrity (usually taken as 0.35 air changes per hour).
Ensure speedy response to inlet-gas detection and time to stop the HVAC.
Take into account consequences for personnel and/or the atmosphere of a build-up of contaminants.
Maintain pressure in the TR area during an incident while ensuring sufficient air flow so that any leakage or other ingress (e.g. through the use of doors) is diluted and displaced.
Ensure availability of power sources to drive the HVAC system during an incident.
In response to a gas alarm, all HVAC exhaust systems will be switched off and the fire and gas-tight dampers closed. This will totally seal off the accommodation.
Our specially developed Temporary Refuge unit is not only sufficient for maintaining pressurisation in the TR area and keeping the accommodation at the ≥ 50 Pa. overpressure mark. It also serves as a battery powered HVAC unit.
Please contact TLS for more information Sales@tls-containers.com
25units 8m intelligent pressurised cabins were manufactured according to DNV2.7-1, IEC60079-13, certified by BV for zone 2 application. Those pressurised cabins will be used as mud logging cabins in east Africa. The client is a giant oil gas drilling company in Africa. TLS always supply the most cost-effectively containerised solutions to world wide clients.
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40FT PRESSURISED ZONE 2-RATED MCC SHELTER DELIVERED TO FRENCH CLIENT
Motor control centre (MCC) shelter was delivered to a French client. The shelter is according to,
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