Connection method between flexible pipes and seamless steel pipes
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What is the connection method between the flexible tube and the seamless steel tube of the instrument?
The conduit used for instruments is not made of seamless steel pipes; it is usually galvanized pipe. The size is generally 1/2 or 3/4, which is what we commonly refer to as 4mm or 6mm, with external threads. Connecting it to a flexible tube requires a reducer fitting; you’ll need to figure out the conversion on your own – this isn’t something that can be explained in just a few words.
There is a Y-shaped connector, also known as an explosion-proof wipe.
Variable-diameter fittings are required on the flexible hose
Fit the sleeve, and then select a flexible tube corresponding to the pipe diameter (it has connectors for connecting to the pipe).
Wire ducts are usually made of galvanized pipes; threads are cut on the ends of these pipes, after which a wire gland is attached, and from there a flexible tube is connected. As for the type of thread to use, you decide based on whether NTP or G threads are required. But it must be connected!
Instrument cables are all protected by galvanized tubes, which have external threads. You can choose appropriate flexible pipe connectors, as well as T-shaped or straight connectors! The key is to know the size of the pipe fitting, that is, what we commonly refer to as how many inches in diameter it is!
Is the poster referring to connecting the sample coil tube to the sample pipe?
As can be seen in the HG/T 21581-1995 (HK12) Manual for the Protection and Connection of Instrument Cables, the standard practice is to use a tee connector at the end of the galvanized pipe; the size of this connector depends, of course, on the size of the galvanized pipe. Then, a flexible tube is connected to the tee! This solves the problem of drainage in flexible pipe connections. Common connection sizes include G1/2\"-M20×1.5 and G3/4\"-M20x1.5; M20x1.5 is generally used for the electrical connections of instruments, while G1/2\" and G3/4\" depend on the diameter of the pipe being used.
Check whether the section of the fitting connected to the coiled tube has internal threads or external threads
Well, many places I’ve been to are like this; there’s an explosion-proof wire box. It still looks neat