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https://www.sinohose.com/development-of-fire-hose-coupling.html

Fire hoses with a diameter ≥ DN100 used screw coupling in the past, which was very difficult to construct. This is due to the large diameter, shallow thread at the pipe interface, weak connection, easy to leak, and deep thread, the thread at the interface The wall of the tube is too thin to withstand the working pressure of the system and it is easy to break. That is to say, the old fire protection design code requires that the pipeline behind the alarm valve, regardless of the diameter of the pipe, require the use of screw couplings to be defective, which is also the main reason why this code needs to be modified. So, what solution has this always had in the engineering practice afterwards?

Heavy-duty hose pipe clamp

1. Pipes with a diameter of <DN100 use a threaded coupling. Pipes with a diameter of ≥100 use a welded or flanged interface. The inner wall of the pipe near the weld is no longer treated for corrosion protection.

2. Pipes with a diameter of <DN100 use a wire-bonded interface, and pipes with a diameter of ≥100 use a welded interface. After welding, a second galvanizing treatment is used (first welded installation, pipe number and marked, and then disassembled and sent to the factory The galvanizing workshop is galvanized, and then the number is seated and installed), which is a mandatory local regulation in Beijing and Shanghai.

2.Pipes with a diameter of <DN100 use a threaded coupling, and fire pipes with a diameter of ≥100 use a clamp-type connector interface.

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COMPANY PROFILE
Established in 1990, SUZHOU SEAPEAK CO., LTD.. is a professional hose fittings manufacturers in China. Covering 6000 square meter, We now have annual sales turnovers in excess of USD15,000,000 and more than 60 workers at our factory. Our ISO9001 certification further demonstrates our commitment to providing high quality products.

Our company specializes in manufacturing china pvc hose , PU layflat hose, PVC/Nitrile layflat hose hose, mill discharge layflat hose, camlock coupling and pin lug coupling. We also distribute PVC air hose, pvc fiber reinforced hose, pvc garden hose, pvc steel wire reinforced hose, pvc sution hose, KC nipple, hose mender, bauer coupling, strainer, universal coupling, double bolt clamp, spiral clamp, foot valve, whipcheck safety cable, ground joint coupling and so on.