Temporary refuge, toxic gas refuge, safe haven

Temporary refuge shelter

Temporary Refuge Shelters.
Planning new Temporary Refuge Shelters for 10, 20 and 30 persons, 1, 2 or 4 hours time duration for oil&gas tender, complete of air-lock, HVAC system, breathing air system (emergency pressurization system), stand alone electric system (UPS+batteries), facilities (medicalkit, water and toilet) and accessories as required by technical specifications. New technologies for TLC, BA, EPS, HVAC and F&G systems. Containerized or blast resistant structures in order to give possibilities of installation in safe area or explosion risk zone.

Survival modules

This kind of SURVIVAL MODULE is designed as "Modularized 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 running in Emergency mode for TR

HVAC System for Oil&Gas TOXIC GAS REFUGES In the D&ID there is the schematic distribution for an HVAC system to be installed inside a Safe Heaven or Toxic Gas Refuge. The operating philosophy of this project is focalized on a system that can be running also during emergency (determinate concentration of hydrocarbon gasses on outdoor atmosphere). This is possible due to the presence of chemical filters for outdoor air and CO2 Scrubber for indoor air. It is preferable to provide also a fresh air intake sized for the necessary gas retention time to stop the system with excessive (and not filtrable by chemical media) toxic gasses concentration.

HVAC stopped in Emergency situation

THE PERFECT HVAC SYSTEM FOR SAFE AREAS (or TEMPORARY REFUGES) In the flow diagram is explained the perfect system for the ventilation (pressurization) and air conditioning of a safe area or a Temporary Refuge with outdoor potential exposition to toxic gases. 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 pressurization 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 barg of storage pressure), reduction groups and nozzles for air diffusion.

Overpressure system

Overpressure systems for Electrical Substation or TR- Protection from weather/dust/toxic gas The engineering of HVAC system or Emergency Pressurization System start from the idea of personnel and equipments protection from critical outdoor conditions like extreme weather, dust or sand storm, H2S, HC 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. In the drawing the study of an overpressure system for a TR interlocked with the Barge Anemometer in order to switch to the system not disturbed by the wind. In the photo on the right the overpressure trunk with ductworks, F&G dampers and volume control damper. On the bottom an overview of protection ductwork on overpressure trunk installed on the external wall of an electrical substation. The last photo show the protection system of fresh air intake of air cooled condenser of chiller units.

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 realized 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 equipments are ATEX Zone 1 IIB T3 rated.