Positive Pressure Analytical Explosion-Proof Cabin
1. Intrinsically Safe Overpressure Enclosure Application Range
Explosion-proof pressure houses are used in the oil refining, chemical, metallurgical, and light industry production, providing on-site safe installation space and protection for various online process gas analyzers and water quality analyzers.
Explosion-proof Overpressure Cabin Image
2. Explosion-proof Positive Pressure Cabin Dimensions
Manufactured according to customer requirements. Generally indicated by the exterior dimensions of 3000mm (length) × 3000mm (width) × 3000mm (height).
The cabin is a non-standard product, its size can be determined based on the number, type, complexity of the system, and operational maintenance space of the analyzer, with adequate allowance provided. Due to the limitations of long-distance transportation, its external dimensions are generally as follows:
Length: Main outdoor structure 2.5 to 6.5m (Due to standard steel sizing, hoisting, and transportation structural strength considerations, the length of an individual analysis cabin should not exceed 6.5m. If 6.5m is required, a modular structure can be used, with separate assembly, transported to the site, and then combined. Alternatively, two analysis cabins can be utilized.)
Width: The main outdoor structure should be 2.5m wide, *the width should not exceed 3.0m (due to road transport width restrictions, it is not advisable to exceed 3.0m).
Height: Outdoor main structure 2.5～3.0m (subject to height restrictions when passing over flyovers or tunnels), indoor clear height 2.2～2.8m.
3. Explosion-proof positive pressure booth mechanical structure and material requirements
① Frame, base, and roof
The frame, base, and roof of the analysis cabin are made of metal components, welded from shaped steel, which should possess adequate strength and rigidity to ensure the cabin remains deformation-free during loading, lifting, shifting, and transportation.
The main frame of the base should be made of 12# to 20# channel steel, with two 10# to 12# channel steel or I-beams used as support beams beneath the floor joists. The main frame, floor joists, and support beams should all be welded together to ensure that the floor does not vibrate when maintenance personnel are walking indoors.
Roof frames and main beams should be made of 10# to 12# channel steel, and 8# to 10# channel steel should be used as support for the main beam and roof joists in the width direction. All should be welded together to prevent warping and deformation. The roof should have a certain inclination, with a minimum slope of 4%, and can be in an A-shaped or flat-slope structure. A flat roof is not allowed to prevent water accumulation.
② Interior and exterior walls, as well as interior and exterior ceiling panels
Exterior wall panels should be made from 1.5mm to 2.0mm steel plates. A Π-shaped panel assembly structure can be used to form the exterior wall. If the welding process is ensured, a ribbed galvanized steel plate welding structure can also be used for the exterior wall. Exterior wall panels using the Π-shaped panel assembly structure are preferably made of stainless steel (304SS, brushed stainless steel film is recommended) or galvanized steel plate. When using galvanized steel plate, surface spraying should be applied, with white or gray as the spray color.
Interior wall panels and ceilings should be made of 1.5mm to 2.0mm steel plates. The materials for the two-person electrical cabin use galvanized steel plates or cold-rolled steel plates, and stainless steel plates can also be used upon customer request. Surface painting should be applied when using galvanized steel plates or cold-rolled plates. Paint colors: ceilings in glossy white, interior wall panels in matte white.
Roof panels must be equipped with an effective waterproof design, which can be either a snap-together waterproof design with a buckle structure or a flat welding waterproof design. Made from 1.5mm to 2.0mm stainless steel sheets, the material ensures the roof's corrosion resistance. The external roof has a load-bearing capacity of ≥250kg/m2 (the weight of two people) without deformation.
Insulation layer
Insulation materials with fire-retardant properties (such as mineral wool) are filled between the interior and exterior walls, as well as between the interior and exterior ceilings. The thickness of the insulation layer is generally 70 to 75mm (3in), but should be increased to 80 to 85mm in extremely cold or hot climates.
④Flooring
The flooring should be a non-slip metal plate, preferably made from 4-6mm steel sheet. The material can be patterned stainless steel plate, patterned galvanized steel plate, or hot-rolled steel plate, as per customer requirements. The surface can be coated with a zinc-plated or hot-rolled steel sheet, with the coating color typically gray. An additional layer of antistatic plastic plate can be added if necessary.
Avoid dead corners and grooves inside the cabin where gases may accumulate. Adequate manual or automatic exhaust ports should be provided at the high and low points of the cabin to prevent gas buildup. The sample pretreatment unit, carrier gas cylinders, standard gas bottles, and laboratory manual sampling points should be located outside the cabin.
4. Explosion-proof positive pressure booth power distribution
The lighting, ventilation fans, air conditioners, and repair outlets in the analysis cabin are powered by industrial power supply. The analyzer system, installation of detection alarms, and interlock systems are powered by UPS power supply.
5. Explosion-proof positive pressure booth safety detection and alarm system
Combustible gas detectors with integrated probe and transmitter body structure, featuring on-site display and contact signal output.
Toxic Gas Detector: A toxic gas alarm must be installed when the sample or surrounding environment contains toxic components, and it should meet the same requirements as the flammable gas alarm.
Micro Differential Pressure Transmitters: The analysis cabin is equipped with a varying number of micro differential pressure transmitters based on the internal volume to detect the positive pressure inside the cabin. The principle for providing signals to the PLC controller by the micro differential pressure transmitters is 3 out of 2, meaning the PLC will cut off the power supply to non-explosion-proof electrical equipment inside the cabin only when two or more of the three transmitters simultaneously indicate pressures below the safe specified values.
Audio-visual alarm devices (rotary flash type), installed outside the cabin.
Explosion-proof alarm control box, internally equipped with a small programmable logic controller (PLC or processor), featuring various indicator lights and buttons on the panel. Its function is to control the safety detection alarm system, enabling on-site alarms (inside and outside the cabin), control room alarms, and interlock functions (such as starting fans and opening instrument air for exhaust ventilation).
Long-term Supply: Explosion-proof Positive Pressure Cabinets, Explosion-proof Positive Pressure Fume Hoods, Stainless Steel Explosion-proof Positive Pressure Cabinets, Piano-Top Style Positive Pressure Explosion-proof Cabinets, Dust Explosion-proof Positive Pressure Cabinets, Explosion-proof Analytical Huts.
