OSS-Ex-Proof Package unit Air Conditioner

Seven Star LLC: Oman and GCC supplier of the OSS-Ex-Proof Package unit explosion-proof Air Conditioner, offering top-quality solutions.

Explosion-Proof Heating Ventilation and Air Conditioning Unit holds certifications from renowned authorities including the European Union ATEX, IECEX, CU EAC. This unit finds its application in hazardous Zone 1 and Zone 2 areas, as classified by GB3836.14. Tailored for use in diverse industries such as oil, chemical, and marine engineering, this HVAC solution is designed for environments adhering to the classification in GB3836.1: IIA, IIB, IIC categories, alongside temperature class T1 ~ T4. It specifically caters to areas where explosive gas mixtures prevail, such as online analysis cabins, control rooms, operating rooms, and electrical rooms. Its purpose is to ensure positive pressure, ventilation, and effective regulation of indoor temperature and humidity levels.

Technical Specifications

Selecting an Explosion-Proof Package Air Conditioner

An explosion-proof package unit is engineered around the room it serves and the hazardous area it sits in, so a good enquiry starts with site data rather than a catalogue capacity. To size and specify the unit correctly, prepare:

• The hazardous area classification of the installation point: zone, gas group and temperature class, taken from the plant’s area classification drawings.
• The heat load of the room, including analyzers, electrical panels, UPS and battery systems, lighting and occupancy, plus solar gain through walls and roof.
• Design ambient conditions, including peak summer dry-bulb temperature, humidity, and exposure to sand, salt spray or corrosive gases.
• The required indoor temperature and humidity band and whether the unit must maintain positive pressure in the room.
• Power supply details, preferred refrigerant, material options and any marine class or project-specific standards.

Redundancy

For analyzer shelters and control or electrical rooms, many projects specify two units in a duty and standby arrangement, so that one unit can be maintained or fail without losing temperature control of critical equipment.

Installation and Commissioning

Installation work in a hazardous area follows the site permit system and the certification requirements of the unit. Key points include using certified cable glands and entries suited to the protection concept, correct earthing and bonding of the frame, and keeping refrigerant pipework and condensate drains properly sealed and supported. During commissioning, verify refrigerant charge, fan rotation, safety cut-outs, alarm outputs to the control system and the pressurization or fresh-air function where fitted, and record operating readings as a baseline for later maintenance.

Maintenance in Harsh Environments

Coastal and desert sites load the condenser coil with salt and sand quickly, which raises head pressure and reduces cooling capacity just when it is needed most. A practical maintenance plan covers regular coil and filter cleaning, inspection of fan motors and bearings, checks on refrigerant pressures and electrical terminations, and periodic inspection of explosion-proof enclosures and gland seals by competent personnel, so that the certification of the unit is maintained throughout its life.

Applications in Oman and the GCC

These units are used on oil and gas production stations, gas processing plants, refineries, petrochemical complexes, offshore platforms and marine terminals, where analyzer houses, instrument rooms and local equipment rooms sit inside classified areas. High ambient temperature and dust make reliable cooling essential for protecting electronics and analyzers.

Sourcing Through Seven Star LLC

Seven Star LLC prepares quotations for explosion-proof HVAC based on your area classification and heat load data, and provides the certification documents and technical submittals needed for project approval. Send your datasheet or room details through our quote request to start the selection.

Browse the full Siemens range or see more HVAC products supplied by Seven Star LLC in Oman and the GCC.