How to prevent water from entering and damaging outdoor field instruments connected to galvanized conduit via explosion-proof flexible pipes
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The wire conduit is a galvanized pipe, with single wires connected to the instruments in the outdoor area via explosion-proof flexible pipes. Since the entire connection is essentially sealed, and the area in question has explosion-proof requirements, the flexible connection pipes must not have holes at their lower ends that could allow water leakage. So, dear marine experts, apart from wrapping each joint with high-pressure waterproof tape, are there any other clever methods to prevent water from entering the connected pipelines and reaching the instruments on site?
I’ve never seen an explosion-proof tube get flooded with water; usually, it’s the wiring tubes that get flooded and affect the instruments. These days, due to explosion-proof requirements, explosion-proof sealed gland fittings are installed
Three-way wire passing box – take a look: the wire pipes from top to bottom along with the three-way connection are used for drainage purposes.
In fact, as long as it is installed carefully in accordance with the specifications, water will not get in. Key tip: The outlet position of the wire conduit should be 200–300 mm lower than the inlet position of the instrument ； The threaded connectors provided at both ends of flexible hoses are only part of the sealing element; you need to add gaskets (some instruments come with these) to create a complete explosion-proof or waterproof connector that can be installed properly ； The flexible tube itself does not require sealing at either end.
Metal hose locking type waterproof connector
I learned it! This connection method is the most scientific; great job!
Thank you so much for sharing! I’ve learned it; this method is the most practical and standardized. Thank you!
This is suitable for intrinsically safe, explosion-proof applications; in the case of flameproofing, won’t the flexible tube and galvanized tube break apart after a while? So there are points that can be debated
Find out about the function of coiled tubes. May I ask, is your cable tray flameproof? Flame isolation does not refer to flexible conduit, wiring ducts, or cable trays either!
. Explosion protection is fine. 1. The connection between the flexible pipe mounting fitting and the instrument must comply with explosion-proof standards. In other words, in theory, the flexible tube itself does not need to provide explosion protection for the instruments ； 2. The explosion-proof certification testing for flexible pipes is carried out in accordance with the flameproofing standards. That is, deflagration tests are conducted after inserting corresponding metal rods at both ends; the heavy metal joints at the ends of the flexible tube, the metal washers, as well as the inner diameter of the joints that does not match the size of those joints, are all designed for pressure relief and energy absorption. That is, the venting at all parts of the flexible tube after wire threading must meet the explosion-proof venting standards. 3. The explosion-proof rating of some flexible hoses is subject to length limitations. .