Cold Galvanizing Flange or cold galvanized flange is the flange surface coated for a thin zinc, it is covered by electro galvanizing works, cold galvanizing also named electro galvanizing for flanges, the cold galvanizing coated thickness on flange was less than hot galvanized, so it is cheaper than hot galvanized coated flanges, but anti-rust time is also short than hot zinc covered on flanges. cold galvanizing flange, electro galvanized flange, zinc coated flanges, threaded screwed galvanized flanges, flange zinc coated Jinan Hyupshin Flanges Co., Ltd , https://www.iflange.com
What are the types of explosion-proof cameras?
At present, there are three types of explosion-proof cameras on the market: intrinsically safe, positive pressure, and flameproof.
"Intrinsically safe" starts from limiting the energy in the circuit. Inside the camera, the potential spark energy is reduced to the ignitable prescribed gas mixture energy through reliable control circuit parameters, and the wire and component surface heating temperature is limited to the specified gas mixture. The lighting temperature. All circuits inside the camera are intrinsically safe circuits that do not ignite the prescribed explosive gas atmosphere by any spark or any thermal effect produced under standard conditions (including normal operation and specified fault conditions) due to "intrinsically safe "Cameras" are relatively expensive and are rarely seen on the market.
The "positive pressure type" explosion-proof type is to maintain continuous air or inert gas in the camera to restrict the flammable mixture from entering the camera through the housing.
The most common type of explosion-proof camera on the market today is a “flameproof type†explosion-proof type, which completely encloses the parts of the camera that may ignite the explosive gas mixture in a single enclosure whose outer shell can withstand any joint or structural gap through the enclosure. The flammable mixture that penetrates into the interior of the enclosure explodes inside without damage, and does not cause the outside to ignite in an explosive atmosphere formed by one or more gases or vapours. Place parts of the camera that may generate sparks, arcs, and dangerous temperatures into a flameproof enclosure that isolates the interior of the camera from the surrounding environment.
There is a gap in the flameproof enclosure. Due to the respiration of the electrical equipment and the gas permeation, an explosive gas mixture may exist inside. When the explosion occurs, the enclosure can withstand the explosion pressure generated without damage, and at the same time, the gap of the shell structure can cool the flame and lower the flame. The speed of flame propagation or the acceleration of the chain is such that flame or dangerous flame products cannot ignite the external explosive atmosphere through the flameproof gap, thereby achieving the purpose of flameproof.